question_answer 1)
A reversible engine receives heat from a reservoir at \[700{}^\circ C\] and rejects heat at a temperature\[{{T}_{2}}\]. A second reversible engine operating on Carnot cycle receives heat rejected by the first engine and rejects heat to a sink at \[37{}^\circ C.\] If work output from each of the engines is equal, what is the value of temperature \[{{T}_{2}}\] ?
A)
641.5 K done
clear
B)
537 K done
clear
C)
516 K done
clear
D)
498.5 K done
clear
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question_answer 2)
According to the Maxwell relation, which of the following is/arc correct?
A)
\[{{\left( \frac{\partial v}{\partial T} \right)}_{p}}=-\,{{\left( \frac{\partial s}{\partial p} \right)}_{T}}\] done
clear
B)
\[{{\left( \frac{\partial s}{\partial v} \right)}_{p}}={{\left( \frac{\partial p}{\partial T} \right)}_{v}}\] done
clear
C)
\[{{\left( \frac{\partial P}{\partial T} \right)}_{v}}={{\left( \frac{\partial p}{\partial s} \right)}_{v}}\] done
clear
D)
All of the above done
clear
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question_answer 3)
Which one of the following relationships defines Gibbs' free energy G?
A)
\[G=H+TS\] done
clear
B)
\[G=H-TS\] done
clear
C)
\[G=U+7S\] done
clear
D)
\[G=U-TS\] done
clear
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question_answer 4)
Consider the following statements:
1. Two reversible adiabatics can never intersect each other. 2. for a thermodynamic process \[\frac{dQ}{T}+1\ge 0,\] where I is the measure of irreversibility.
Which of the statements given above is/are correct?
A)
1 only done
clear
B)
2 only done
clear
C)
Both 1 and 2 done
clear
D)
neither 1 nor 2 done
clear
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question_answer 5)
Constant pressure lines in the superheated region of the Mother diagram have what type of slope?
A)
A positive slope done
clear
B)
A negative slope done
clear
C)
Zero slope done
clear
D)
May have either positive or negative slope. done
clear
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question_answer 6)
Which one of the following is the extensive property of a thermodynamic system?
A)
Volume done
clear
B)
Pressure done
clear
C)
Temperature done
clear
D)
Density done
clear
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question_answer 7)
Which one of the following is the correct statement? Steam is said to be superheated when the
A)
Actual volume is greater than volume of saturated steam done
clear
B)
Actual volume is less than volume of saturated steam done
clear
C)
Actual volume is equal to volume of saturated steam done
clear
D)
None of the above done
clear
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question_answer 8)
If \[{{M}_{1}}\,,\] \[{{M}_{2}}\,,\] \[{{M}_{3}}\] be molecular weight of constituent gases and \[{{m}_{1}},\] \[{{m}_{2}},\] \[{{m}_{3}},....\] their corresponding mass fractions, then what is the molecular weight M of the mixture equal to?
A)
\[{{m}_{1}}\,{{M}_{1}}+{{m}_{2}}\,{{M}_{2}}+{{m}_{3}}\,{{M}_{3}}+...\] done
clear
B)
\[\frac{1}{{{m}_{1}}\,{{M}_{1}}+{{m}_{2}}\,{{M}_{2}}+{{m}_{3}}\,{{M}_{3}}+...}\] done
clear
C)
\[\frac{1}{{{m}_{1}}\,{{M}_{1}}}+\frac{1}{{{m}_{2}}\,{{M}_{2}}}+\frac{1}{{{m}_{3}}\,{{M}_{3}}}+...\] done
clear
D)
\[\frac{1}{\left( \frac{{{m}_{1}}}{{{M}_{1}}} \right)+\left( \frac{{{m}_{2}}}{{{M}_{2}}} \right)+\left( \frac{{{m}_{3}}}{{{M}_{3}}} \right)+...}\] done
clear
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question_answer 9)
If a gas obeys van-der Waals' equation at the critical point, then \[\frac{R\,{{T}_{c}}}{{{p}_{c}}\,{{v}_{c}}}\] is equal to which one of the following?
A)
0 done
clear
B)
1 done
clear
C)
1.5 done
clear
D)
2.67 done
clear
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question_answer 10)
Which one of the following is the correct statement? Two adiabatics will
A)
Intersect at absolute zero temperature done
clear
B)
Never intersect done
clear
C)
Become orthogonal at absolute zero temperature done
clear
D)
Become parallel at absolute zero temperature done
clear
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question_answer 11)
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II A. Irreversibility 1. Mechanical equivalent B. Joule-Thomson experiment 2. Thermodynamic temperature scale C. Joule?s experiment 3. Throttling process D. Reversible engine 4. Loss of availability
Codes:
A)
A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 done
clear
B)
A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 done
clear
C)
A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 done
clear
D)
A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 done
clear
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question_answer 12)
For air standard Brayton cycle, increase in the maximum temperature of the cycle, while keeping the pressure ratio the same, would result in:
A)
Increase in air standard efficiency done
clear
B)
Decrease in air standard efficiency done
clear
C)
No change in air standard efficiency done
clear
D)
Increase in the efficiency but reduction in network done
clear
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question_answer 13)
Which one of the following cycles working within the same temperature limits has the highest work ratio?
A)
Carnot cycle done
clear
B)
Joule cycle done
clear
C)
Otto cycle done
clear
D)
Rankine cycle. done
clear
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question_answer 14)
The equation of state \[pv=R\,T\,\,(1+{B}/{v+{C}/{{{v}^{2}}+{D}/{{{v}^{3}}+...)}\;}\;}\;\] is known as:
A)
Van der Waals equation done
clear
B)
Benedict-Webb-Rubin equation done
clear
C)
Gibbs equation done
clear
D)
Virial equation. done
clear
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question_answer 15)
What is the ratio of the slopes for p?v curves for an adiabatic process and an isothermal process?
A)
\[{1}/{\gamma }\;\] done
clear
B)
\[\gamma +1\] done
clear
C)
\[\gamma \] done
clear
D)
\[\frac{1}{\gamma +1}\] done
clear
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question_answer 16)
Match List-I (Thermodynamic system/prime mover) with List-II (Thermodynamic cycle) and select the correct answer using the codes given below the lists:
List-I List-II A. Air liquefaction plant 1. Atkinson cycle B. Gas turbine with multistage compression and multistage expansion 2. Brayton cycle C. Free piston engine/compressor with a gas turbine 3. Ericsson cycle D. Pulse jet 4. Reversed Stirling cycle 5. Lenoir cycle
Codes:
A)
A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 done
clear
B)
A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 done
clear
C)
A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]5 done
clear
D)
A\[\to \]4, B\[\to \]3, C\[\to \]5, D\[\to \]1 done
clear
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question_answer 17)
What is the molecular weight (approximate) for the gas whose specific heats are as follows? \[{{c}_{p}}=1.967\,\,kJ/kg\,\,K\,;\] \[{{c}_{v}}=1.507\,\,kJ/kg\,\,K\,\,\]
A)
17 done
clear
B)
18 done
clear
C)
19 done
clear
D)
20 done
clear
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question_answer 18)
Consider the following statements:
The maximum temperature produced by the combustion of a unit mass of fuel depends upon 1. L.C.V. 2. Ash content 3. Mass of air supplied 4. Pressure in the furnace
Of these statements
A)
1 alone is correct done
clear
B)
1 and 3 are correct done
clear
C)
2 and 4 are correct done
clear
D)
3 and 4 are correct done
clear
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question_answer 19)
The critical pressure ratio \[\left( \frac{{{p}_{2}}}{{{p}_{1}}} \right)\] for maximum discharge through a nozzle is:
A)
\[{{\left( \frac{2}{n+1} \right)}^{\left( \frac{n\,\,-\,\,1}{n} \right)}}\] done
clear
B)
\[{{\left( \frac{2}{n+1} \right)}^{\left( \frac{n}{n\,\,-\,\,1} \right)}}\] done
clear
C)
\[{{\left( \frac{2}{n-1} \right)}^{\left( \frac{n}{n\,\,+\,\,1} \right)}}\] done
clear
D)
\[{{\left( \frac{2}{n-1} \right)}^{\left( \frac{n\,\,+\,\,1}{n} \right)}}\] done
clear
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question_answer 20)
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I (Parameter) List-II (Property) A. Volume 1. Path function B. Density 2. Intensive property C. Pressure 3. Extensive property D. Work 4. Point function
Codes:
A)
A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 done
clear
B)
A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done
clear
C)
A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 done
clear
D)
A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 done
clear
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question_answer 21)
Ratio of specific heats for an ideal gas is given by: (Symbols have the usual meanings)
A)
\[\frac{1}{1-\frac{R}{{{c}_{p}}}}\] done
clear
B)
\[\frac{1}{1-\frac{{{c}_{p}}}{R}}\] done
clear
C)
\[\frac{1}{1+\frac{{{c}_{p}}}{R}}\] done
clear
D)
\[\frac{1}{1+\frac{R}{{{c}_{p}}}}\] done
clear
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question_answer 22)
For a Carnot engine \[{{T}_{1}}>{{T}_{2}}.\] When \[{{T}_{2}}\] is decreased by \[\Delta T\] with \[{{T}_{1}}\] remaining same then efficiency is \[{{\eta }_{1}},\] and when \[{{T}_{1}}\] is increased by \[\Delta T\] with \[{{T}_{2}}\] remaining same, efficiency is \[{{\eta }_{2}}.\] Which one of the following is the correct expression for \[\left( {{\eta }_{1}}-{{\eta }_{2}} \right)?\]
A)
\[\frac{({{T}_{2}}-{{T}_{1}})\,\,\Delta \,T+{{(\Delta \,T)}^{2}}}{{{T}_{2}}({{T}_{2}}+\Delta \,T)}\] done
clear
B)
\[\frac{({{T}_{2}}-{{T}_{1}})\,\,\Delta \,T+{{(\Delta \,T)}^{2}}}{{{T}_{1}}({{T}_{1}}+\Delta \,T)}\] done
clear
C)
\[\frac{({{T}_{1}}-{{T}_{2}})\,\,\Delta \,T+{{(\Delta \,T)}^{2}}}{{{T}_{1}}({{T}_{1}}+\Delta \,T)}\] done
clear
D)
\[\frac{({{T}_{1}}-{{T}_{2}})\,\,\Delta \,T+{{(\Delta T)}^{2}}}{{{T}_{1}}({{T}_{1}}+\Delta T)}\] done
clear
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question_answer 23)
The heat transferred in a thermodynamic cycle of a system consisting of four processes are successively 0, 8, 6 and \[-\,\,4\] units. The net change in the internal energy of the system will be:
A)
\[-\,\,8\] done
clear
B)
zero done
clear
C)
10 done
clear
D)
\[-\,\,10\] done
clear
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question_answer 24)
If a system undergoes an irreversible adiabatic process, then (symbols have usual meanings:
A)
\[\int{\frac{dQ}{T}}\,\,=\,\,0\] and \[\Delta \,S>0\] done
clear
B)
\[\int{\frac{dQ}{T}\,\,=\,\,0}\] and \[\Delta \,S\,\,=\,\,0\] done
clear
C)
\[\int{\frac{dQ}{T}>0}\] and \[\Delta \,S\,\,=\,\,0\] done
clear
D)
\[\int{\frac{dQ}{T}<0}\] and \[\Delta \,S<0\] done
clear
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question_answer 25)
During a process with heat and work interactions, the internal energy of a system increases by 30 kJ. The amounts of heat and work interactions are respectively:
A)
\[-\,\,50\]kJ and \[-\,\,80\]kJ done
clear
B)
\[-\,\,50\]kJ and 80 kJ done
clear
C)
50 kJ and 80 kJ done
clear
D)
50 kJ and \[-\,\,80\]kJ done
clear
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question_answer 26)
The mathematical conditions at the critical point for a pure substance would be:
A)
\[\frac{\partial p}{\partial v}<0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}=0\] and \[\frac{{{\partial }^{3}}p}{\partial {{v}^{3}}}=0\] done
clear
B)
\[\frac{\partial p}{\partial v}=0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}<0\] and \[\frac{{{\partial }^{3}}p}{\partial {{v}^{3}}}=0\] done
clear
C)
\[\frac{\partial p}{\partial v}=0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}=0\] and \[\frac{{{\partial }^{3}}p}{\partial {{v}^{3}}}<0\] done
clear
D)
\[\frac{\partial p}{\partial v}=0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}=0\] and \[\frac{{{\partial }^{3}}p}{\partial \,{{v}^{3}}}\,\,=\,\,0\] done
clear
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question_answer 27)
What is the value of slope for an isothermal process on \[p\,-\,v\] diagram for an ideal gas?
A)
\[-\,\,p/v\] done
clear
B)
\[-\,\,v/p\] done
clear
C)
\[-1/(pv)\] done
clear
D)
\[-\,\,pv\] done
clear
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question_answer 28)
Forced draught fans of a large steam generator have:
A)
Backward curved blades done
clear
B)
Forward curved blades done
clear
C)
Straight or radial blades done
clear
D)
Double curved blades done
clear
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question_answer 29)
Air from a reservoir is to be passed through a supersonic nozzle so that the jet will have a Mach Number of 2. If the static temperature of the jet is not to be less than \[27{}^\circ C,\] the minimum temperature of air in the reservoir should be:
A)
\[48.6{}^\circ C\] done
clear
B)
\[167{}^\circ C\] done
clear
C)
\[267{}^\circ C\] done
clear
D)
\[367{}^\circ C\] done
clear
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question_answer 30)
The air standard efficiency of Diesel cycle will be less than that of Otto cycle in the case of:
A)
Same compression ratio and same heat input done
clear
B)
Same maximum pressure and same heat input done
clear
C)
Same maximum pressure and same output done
clear
D)
Same maximum pressure and same maximum temperature done
clear
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question_answer 31)
A section diverging in the direction of flow can be used as which of the following?
1. Subsonic nozzle 2. Supersonic nozzle 3. Subsonic diffuser 4. Supersonic diffuser
Select the correct answer using the code given below:
A)
1 only done
clear
B)
2 and 3 done
clear
C)
1 and 4 done
clear
D)
3 only done
clear
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question_answer 32)
Air is compressed adiabatically in a steady flow process with negligible change in potential and kinetic energy. The work done in the process is given by:
A)
\[-\,\int{p\,\,dv}\] done
clear
B)
\[+\,\int{p\,\,dv}\] done
clear
C)
\[-\,\int{v\,\,dp}\] done
clear
D)
\[+\,\int{v\,\,dp}\] done
clear
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question_answer 33)
Which one of the following properties remains unchanged for a real gas during Joule-Thomson process?
A)
Temperature done
clear
B)
Enthalpy done
clear
C)
Entropy done
clear
D)
Pressure done
clear
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question_answer 34)
In respect of a closed system, when an ideal gas undergoes a reversible isothermal process:
A)
Heat transfer is zero done
clear
B)
Change in internal energy is equal to work transfer done
clear
C)
Work transfer is zero done
clear
D)
Heat transfer is equal to work transfer. done
clear
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question_answer 35)
The volumetric air content of a tyre at \[27{}^\circ C\] and at 2 bar is 30 litres. If one morning the temperature dips \[-\,\,3{}^\circ C,\] then the air pressure in the tyre would be:
A)
1.8 bar done
clear
B)
11 bar done
clear
C)
0.8 bar done
clear
D)
The same as at \[27{}^\circ C\] done
clear
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question_answer 36)
One kg of a perfect gas is compressed from pressure \[{{p}_{1}}\] to pressure \[{{p}_{2}}\] by
1. Isothermal process 2. Adiabatic process 3. The law \[p{{v}^{1.1}}\,\,=\,\] constant
The correct sequence of these processes in increasing order of their work requirement is:
A)
1, 2, 3 done
clear
B)
1, 3, 2 done
clear
C)
2, 3, 1 done
clear
D)
3, 1, 2. done
clear
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question_answer 37)
Triple point temperature of water is:
A)
2 73 K done
clear
B)
273.14 K done
clear
C)
273.15 K done
clear
D)
273.16 K. done
clear
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question_answer 38)
In a test of a water-jacketed compressor, the shaft work required is 90 kN\[\,-\,\]m/kg of air compressed. During compression, increase in enthalpy of air is 30 kJ/kg of air and increase in enthalpy of circulating cooling water is 40 kJ/kg of air. The change in velocity is negligible. The amount of heat lost to the atmosphere from the compressor per kg of air is:
A)
20 kJ done
clear
B)
60 kJ done
clear
C)
80 kJ done
clear
D)
120 kJ done
clear
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question_answer 39)
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II A. The entropy of a pure crystalline substance is zero at absolute zero temperature 1. First law of thermodynamics B. Spontaneous processes occur in a certain direction 2. Second law of thermodynamics C. If two bodies are in thermal equilibrium with a third body, then they are also in thermal equilibrium with each other 3. Third law of thermodynamics D. The law of conservation of energy 4. Zeroth law of thermodynamics
Codes:
A)
A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 done
clear
B)
A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done
clear
C)
A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 done
clear
D)
A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 done
clear
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question_answer 40)
1600 kJ of energy is transferred from a heat reservoir at 800 K. to another heat reservoir at 400 K. The amount of entropy generated during the process would be:
A)
6 kJ/K done
clear
B)
4 kJ/K done
clear
C)
2 kJ/K done
clear
D)
zero. done
clear
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question_answer 41)
For a compression or heating process, what is the expression for effectiveness\[\varepsilon \]?
A)
\[\varepsilon \,\,=\,\,\frac{Increase\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}{Loss\,\,of\,\,availability\,\,of\,\,the\,\,system}\] done
clear
B)
\[\varepsilon \,\,=\,\,\frac{Increase\,\,of\,\,availability\,\,of\,\,the\,\,system}{Loss\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}\] done
clear
C)
\[\varepsilon \,\,=\,\,\frac{Loss\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}{Increase\,\,of\,\,availability\,\,of\,\,the\,\,system}\] done
clear
D)
\[\varepsilon \,\,=\,\,\frac{Loss\,\,of\,\,availability\,\,of\,\,the\,\,system}{Increase\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}\] done
clear
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question_answer 42)
Match List-I (Cycle) with List-II (Process) and select the correct answer using the codes given below the lists:
List-I (Cycle) List-II (Process) A. Otto 1. Two isothermal and two constant volume B. Stirling 2. Two isothermal and two isobar C. Ericsson 3. Two isentropic and two isobar D. Brayton 4. Two isentropic and two constant volume 5. Two isentropic and two isothermal
Codes:
A)
A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 done
clear
B)
A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]5 done
clear
C)
A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]5 done
clear
D)
A\[\to \]1, B\[\to \]4, C\[\to \]5, D\[\to \]3 done
clear
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question_answer 43)
The specific heat \[{{c}_{p}}\] is given by:
A)
\[T{{\left( \frac{\partial \,v}{\partial \,T} \right)}_{p}}\] done
clear
B)
\[T{{\left( \frac{\partial \,v}{\partial \,S} \right)}_{p}}\] done
clear
C)
\[T{{\left( \frac{\partial \,S}{\partial \,T} \right)}_{p}}\] done
clear
D)
\[T{{\left( \frac{\partial \,T}{\partial \,v} \right)}_{p}}\] done
clear
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question_answer 44)
In free expansion of a gas between two equilibrium states, the work transfer involved:
A)
Can be calculated by joining the two states on\[p-v\]Coordinates by any path and estimating the area below done
clear
B)
Can be calculated by joining the two states by quasi-static path and then finding the area below done
clear
C)
Is zero done
clear
D)
Is equal to heat generated by friction during? Expansion done
clear
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question_answer 45)
Consider the following statements:
(1) The Second Law analysis can be applied to thermodynamic cycles only and not to individual processes. (2) The Second Law analysis clearly gives an idea about the irreversibilities in the heat exchangers whereas no idea is obtained from the First Law analysis.
Which of the statements given above is/are correct?
A)
1 only done
clear
B)
2 only done
clear
C)
Both 1 and 2 done
clear
D)
neither 1 nor 2 done
clear
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question_answer 46)
Which of the following statements are associated with second law of thermodynamics
1. When a system executes a cyclic process, network transfer is equal to net heat transfer. 2. It is impossible to construct an engine, that operating in a cycle will produce no other effect than the extraction of heat from a reservoir and performance of an equivalent amount of work. 3. It is impossible by any procedure, no matter how idealized, to reduce any system the absolute zero of temperature in a finite number of operations 4. It is impossible to construct a device that operating in a cycle will produce no effect other than transfer of heat from a cooler to hotter body.
Select the correct answer using the codes given below:
A)
1, 2 and 4 done
clear
B)
2 and 4 done
clear
C)
2, 3 and 4 done
clear
D)
2 and 3 done
clear
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question_answer 47)
Clausius inequality is stated as:
A)
\[\oint{\delta Q<0}\] done
clear
B)
\[\oint{\delta Q\,\,=\,\,0}\] done
clear
C)
\[\oint{\frac{\delta Q}{T}>0}\] done
clear
D)
\[\oint{\frac{\delta Q}{T}\le 0}\] done
clear
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question_answer 48)
A heat engine working on Carnot cycle receives heat at the rate of 40 kW from a source at 1200 K and rejects it to a sink at 300 K. The heat rejected is:
A)
30 kW done
clear
B)
20 kW done
clear
C)
10 kW done
clear
D)
5 kW done
clear
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question_answer 49)
An electric power generating station produces 400 MW. If the coal releases \[36\,\times \,{{10}^{8}}\] kJ/h of energy, the rate of rejection of heat from the power plant is:
A)
200 MW done
clear
B)
400 MW done
clear
C)
600 MW done
clear
D)
800 MW done
clear
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question_answer 50)
An ideal gas with initial volume, pressure and temperature of \[0.1\,\,{{m}^{3}},\] 1 bar and \[27{}^\circ C\] respectively is compressed in a cylinder by a piston such that its final volume and pressure are \[0.04\,\,{{m}^{3}}\] and 5 bar respectively, then its final temperature will be:
A)
\[-\,\,123{}^\circ C\] done
clear
B)
\[54{}^\circ C\] done
clear
C)
\[327{}^\circ C\] done
clear
D)
\[600{}^\circ C\] done
clear
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question_answer 51)
A cyclic heat engine receives 600 kJ of heat from a 1000 K source and rejects 450 kJ to a 300 K sink. The quantity \[\oint{\frac{\delta Q}{T}}\] and efficiency of the engine are respectively:
A)
2.1 kJ/K and 70% done
clear
B)
\[-\,\,0.9\] kJ/K and 25% done
clear
C)
\[+\,\,0.9\] kJ/K and 70% done
clear
D)
\[-\,\,2.1\] kJ/K and 50% done
clear
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question_answer 52)
Which of the following symptoms show that the combustion in air is necessarily complete:
A)
Absence of oxygen in exhaust done
clear
B)
Absence of nitrogen in exhaust done
clear
C)
Absence of free carbon in exhaust done
clear
D)
Absence of carbon monoxide in exhaust done
clear
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question_answer 53)
Orsat gas analyzer determines volumetric composition of the flue gases in respect of:
A)
\[{{O}_{2}}\] and \[{{N}_{2}}\] done
clear
B)
\[{{O}_{2}}\] and \[C{{O}_{2}}\] done
clear
C)
\[C{{O}_{2}}\] CO and \[{{N}_{2}}\] done
clear
D)
\[{{N}_{2}},\] \[{{O}_{2}},\] \[C{{O}_{2}}\] and CO done
clear
View Solution play_arrow
question_answer 54)
In isentropic flow between two points:
A)
The stagnation pressure decreases in the direction of flow done
clear
B)
The stagnation temperature and stagnation pressure decrease with increase in the velocity done
clear
C)
The stagnation temperature and stagnation pressure may vary done
clear
D)
The stagnation temperature and stagnation pressure remain constant done
clear
View Solution play_arrow
question_answer 55)
Work done in a free expansion process is:
A)
Positive done
clear
B)
negative done
clear
C)
Zero done
clear
D)
maximum done
clear
View Solution play_arrow
question_answer 56)
Match List-I (Quantity) with List-II (Measuring Device) and select the correct answer using the codes given below the lists:
List-I (Quantity) List-II (Measuring Device) A. Engine speed 1. Manometer B. Fuel heating value 2. Tachometer C. Air velocity 3. Hydrometer D. Relative humidity of air 4. Calorimeter 5. Hygrometer
Codes:
A)
A\[\to \]2, B\[\to \]5, C\[\to \]1, D\[\to \]4 done
clear
B)
A\[\to \]1, B\[\to \]5, C\[\to \]3, D\[\to \]4 done
clear
C)
A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]5 done
clear
D)
A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]5 done
clear
View Solution play_arrow
question_answer 57)
For the expression \[\int{p\,\,dv}\] to represent the work, which of the following conditions should apply?
A)
The system is closed one and process takes place in non-flow system. done
clear
B)
The process is non-quasi-static. done
clear
C)
The boundary of the system should not move in order that work may be transferred. done
clear
D)
If the system is open one, it should be non- reversible done
clear
View Solution play_arrow
question_answer 58)
Variation of pressure and volume at constant temperature are correlated through:
A)
Charles' law done
clear
B)
Boyle's law done
clear
C)
Joule's law done
clear
D)
Gay Lussac's law done
clear
View Solution play_arrow
question_answer 59)
The velocity of sound in an ideal gas does not depend on:
A)
The specific heat ratio of the gas done
clear
B)
The molecular weight of the gas done
clear
C)
The temperature of the gas done
clear
D)
The density of the gas done
clear
View Solution play_arrow
question_answer 60)
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II A. Joule-Thomson coefficient 1. 5/2 R B. \[{{c}_{p}}\] for monoatomic gas 2. \[{{c}_{v}}\] C. \[{{c}_{p}}-{{c}_{v}}\] for diatomic gas 3. R D. \[{{\left( \frac{\partial U}{\partial T} \right)}_{v}}\] 4. \[{{\left( \frac{\partial T}{\partial p} \right)}_{h}}\]
Codes:
A)
A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 done
clear
B)
A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]2 done
clear
C)
A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 done
clear
D)
A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 done
clear
View Solution play_arrow
question_answer 61)
An inventor claims that heat engine has the following specifications:
Power developed = 50 kW, Fuel burned per hour = 3 kg Heating value of fuel = 75,000 kJ per kg Temperature limits = \[627{}^\circ C\] and \[27{}^\circ C\] Cost of fuel =Rs. 30/kg. Value of power = Rs. 5/kWh,
The performance of his engine is:
A)
Possible done
clear
B)
not possible done
clear
C)
Economical done
clear
D)
uneconomical done
clear
View Solution play_arrow
question_answer 62)
In a normal shock wave in one-dimensional flow:
A)
Pressure, density and temperature increase done
clear
B)
Velocity, temperature and density increase done
clear
C)
Pressure, density and temperature decrease done
clear
D)
Velocity, pressure and density decrease done
clear
View Solution play_arrow
question_answer 63)
Identify the process of change of a closed system in which the work transfer is maximum:
A)
Isothermal done
clear
B)
Isochoric done
clear
C)
Isentropic done
clear
D)
Polytropic done
clear
View Solution play_arrow
question_answer 64)
A system executes a cycle there are four heat transfers:
\[{{Q}_{12}}\,\,=\,220\,kJ,\] \[{{Q}_{23}}=-\,25\,\,kJ,\] \[{{Q}_{34}}=-\,180\,\,kJ,\] \[{{Q}_{41}}\,\,=\,\,50\,\,kJ.\] The work during three of the processes is:
\[{{W}_{12}}=15\,\,kJ,\] \[{{W}_{23}}=-\,10\,\,kJ,\] \[{{W}_{34}}=60\,\,kJ.\]The work during the process \[4-1\] is:
A)
\[-\,\,230\,kJ\] done
clear
B)
0 kJ done
clear
C)
230 kJ done
clear
D)
130 kJ done
clear
View Solution play_arrow
question_answer 65)
Which one of the following statements is not correct?
A)
Change in entropy during a reversible adiabatic process is zero. done
clear
B)
Entropy increases with the addition of heat. done
clear
C)
Throttling is a constant entropy expansion process. done
clear
D)
Change in entropy when a gas is heated under constant pressure is given by\[{{s}_{2}}-{{s}_{1}}=m{{c}_{p}}\,\,lo{{g}_{e}}\,\frac{{{T}_{2}}}{{{T}_{1}}}\] done
clear
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question_answer 66)
If u, t, v, s, h and p refer to internal energy, temperature, volume, entropy, enthalpy and pressure respectively; and subscript 0 refers to environment conditions, availability function for a closed system is given by:
A)
\[u+{{p}_{0}}v-{{T}_{0}}s\] done
clear
B)
\[u-{{p}_{0}}v+{{T}_{0}}s\] done
clear
C)
\[h+{{p}_{0}}v+{{T}_{0}}s\] done
clear
D)
\[h-{{p}_{0}}v+{{T}_{0}}s\] done
clear
View Solution play_arrow
question_answer 67)
If h, p, T and v refer to enthalpy, pressure, temperature and specific volume respectively; and subscripts g and \[f\] refer to saturation conditions of vapour and liquid respectively, then Clausius-Clapeyron equation applied to change of phase from liquid to vapour states is:
A)
\[\frac{dp}{dt}=\frac{({{h}_{g}}-{{h}_{f}})}{({{v}_{g}}-{{v}_{f}})}\] done
clear
B)
\[\frac{dp}{dt}=\frac{({{h}_{g}}-{{h}_{f}})}{T\,({{v}_{g}}-{{v}_{f}})}\] done
clear
C)
\[\frac{dp}{dt}=\frac{({{h}_{g}}-{{h}_{f}})}{T}\] done
clear
D)
\[\frac{dp}{dt}=\frac{({{v}_{g}}-{{v}_{f}})T}{({{h}_{g}}-{{h}_{f}})}\] done
clear
View Solution play_arrow
question_answer 68)
A gas turbine cycle with infinitely large number of stages during compression and expansion approaches:
A)
Stirling cycle done
clear
B)
Atkinson cycle done
clear
C)
Ericsson cycle done
clear
D)
Brayton cycle done
clear
View Solution play_arrow
question_answer 69)
The COP of a refrigerator on a reversed Carnot cycle is 5. The ratio of higher absolute temperature to the lower temperature \[(i.e.,\,\,{{T}_{2}}/{{T}_{1}})\] is:
A)
1.25 done
clear
B)
1.3 done
clear
C)
1.4 done
clear
D)
1.2 done
clear
View Solution play_arrow
question_answer 70)
For an ideal gas, the expression \[\left[ T\,{{\left( \frac{\partial s}{\partial T} \right)}_{p}}-T\,{{\left( \frac{\partial s}{\partial T} \right)}_{v}} \right]\] is equal to:
A)
Zero done
clear
B)
\[{{c}_{p}}/{{c}_{v}}\] done
clear
C)
R done
clear
D)
RT done
clear
View Solution play_arrow
question_answer 71)
or a non-flow constant pressure process, the heat exchange is equal to:
A)
Zero done
clear
B)
The work done done
clear
C)
The change in internal energy done
clear
D)
The change in enthalpy done
clear
View Solution play_arrow
question_answer 72)
For a real thermodynamic cycle:
A)
\[\oint{\frac{dQ}{T}}>but<\infty \] done
clear
B)
\[\oint{\frac{dQ}{T}}<0\] done
clear
C)
\[\oint{\frac{dQ}{T}}=0\] done
clear
D)
\[\oint{\frac{dQ}{T}}=\infty \] done
clear
View Solution play_arrow
question_answer 73)
A higher value of Van der Waals constant for a gas indicates that the:
A)
Molecules of the gas have smaller diameter done
clear
B)
Gas can be easily liquified done
clear
C)
Gas has higher molecular weight done
clear
D)
Gas has lower molecular weight done
clear
View Solution play_arrow
question_answer 74)
Total enthalpy of steam at the inlet of a nozzle is 2800 kJ while static enthalpy at the exit is 2555 kJ. What is the steam velocity at the exit if expansion is isentropic?
A)
70 m/s done
clear
B)
245 m/s done
clear
C)
450 m/s done
clear
D)
700 m/s done
clear
View Solution play_arrow
question_answer 75)
In an adiabatic process 6000 J of work is performed on a system. In the non-adiabatic process by which the system returns to its original state, 1000 J of heat is added to the system. What is the work done during non-adiabatic process?
A)
\[+\,\,7000\,\,J\] done
clear
B)
\[-\,\,7000\,\,J\] done
clear
C)
\[+\,\,5000\,\,J\] done
clear
D)
\[-\,\,5000\,\,J\] done
clear
View Solution play_arrow
question_answer 76)
Heat flows between two reservoirs having temperatures 1000 K and 500 K, respectively. If the entropy change of the cold reservoir is 10 kJ/K, then what is the entropy change for the hot reservoir?
A)
\[-\,\,10\,\,kJ/K\] done
clear
B)
\[-\,\,5\,\,kJ/K\] done
clear
C)
\[5\,\,kJ/K\] done
clear
D)
\[10\,\,kJ/K\] done
clear
View Solution play_arrow
question_answer 77)
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II A. Bottle filling of gas 1. Absolute zero temperature B. Nernst-Simon statement 2. Variable flow C. Joule-Thomson effect 3. Quasi-static path D. \[\int{p\,\,dv}\] 4. Isenthalpic process 5. Dissipative effect 6. Low grade energy 7. Pressure and temperature during phase change
Codes:
A)
A\[\to \]6, B\[\to \]5, C\[\to \]4, D\[\to \]3 done
clear
B)
A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 done
clear
C)
A\[\to \]2, B\[\to \]5, C\[\to \]7, D\[\to \]4 done
clear
D)
A\[\to \]6, B\[\to \]1, C\[\to \]7, D\[\to \]4 done
clear
View Solution play_arrow
question_answer 78)
\[{{M}_{1}}\] kg of water at \[{{T}_{1}}\] is isobarically and adiabatically mixed with \[{{M}_{2}}\,\,kg\] of water at \[{{T}_{2}}\,({{T}_{1}}>{{T}_{2}}).\] The entropy change of the universe is:
A)
Necessarily positive done
clear
B)
Necessarily negative done
clear
C)
Always zero done
clear
D)
Negative or positive but not zero done
clear
View Solution play_arrow
question_answer 79)
A heat engine using lake water at \[12{}^\circ C\] as source and the surrounding atmosphere at \[2{}^\circ C\] as sink executes 1080 cycles per minute. If amount of heat supplied per cycle is 57 J, what is the output of the engine?
A)
66 W done
clear
B)
56 W done
clear
C)
46 W done
clear
D)
36 W done
clear
View Solution play_arrow
question_answer 80)
A reversible heat engine runs between high temperature \[{{T}_{1}}\] and low temperature \[{{T}_{2}}.\] the work output of this heat engine is used to run a reversible refrigeration cycle absorbing heat at temperature \[{{T}_{3}}\] and rejecting at temperature \[{{T}_{2}}.\]what is the COP of the combined system?
A)
\[\left( \frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}} \right)\,\,\left( \frac{{{T}_{3}}}{{{T}_{2}}-{{T}_{3}}} \right)\] done
clear
B)
\[\left( \frac{{{T}_{2}}}{{{T}_{1}}-{{T}_{2}}} \right)\,\,\left( \frac{{{T}_{2}}-{{T}_{3}}}{{{T}_{3}}} \right)\] done
clear
C)
\[\left( \frac{{{T}_{1}}}{{{T}_{1}}-{{T}_{2}}} \right)\,\,\left( \frac{{{T}_{3}}}{{{T}_{2}}-{{T}_{3}}} \right)\] done
clear
D)
\[\left( \frac{{{T}_{3}}}{{{T}_{1}}-{{T}_{3}}} \right)\,\,\left( \frac{{{T}_{1}}}{{{T}_{2}}-{{T}_{1}}} \right)\] done
clear
View Solution play_arrow
question_answer 81)
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II A. Reversible cycle 1. Measurement of temperature B. Mechanical work 2. Clapeyron equation C. Zeroth Law 3. Clausius Theorem D. Heat 4. High grade energy 5. \[{{3}^{rd}}\] Law of thermodynamics 6. In exact differential
Codes:
A)
A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]6 done
clear
B)
A\[\to \]2, B\[\to \]6, C\[\to \]1, D\[\to \]3 done
clear
C)
A\[\to \]3, B\[\to \]1, C\[\to \]5, D\[\to \]6 done
clear
D)
A\[\to \]1, B\[\to \]4, C\[\to \]5, D\[\to \]2 done
clear
View Solution play_arrow
question_answer 82)
A. closed thermodynamic system is one in which:
A)
There is no energy or mass transfer across the boundary done
clear
B)
There is no mass transfer, but energy transfer exists done
clear
C)
There is no energy transfer. But mass transfer exists done
clear
D)
Both energy and mass transfer take place across the boundary, but the mass transfer is controlled by valves done
clear
View Solution play_arrow
question_answer 83)
A refrigerating machine working on reversed Carnot cycle takes out 2 kW of heal from the system at 200 K while working between temperature limits of 300 K and 200 K. COP and power consumed by the cycle will respectively, be:
A)
1 and 1 kW done
clear
B)
1 and 2 kW done
clear
C)
2 and 1 kW done
clear
D)
2 and 2 kW done
clear
View Solution play_arrow
question_answer 84)
If a gas obeys Van-der Waals equation at the critical point, then what does \[\frac{R{{T}_{c}}}{{{P}_{c}}{{V}_{c}}}\] equal to?
A)
Zero done
clear
B)
unity done
clear
C)
1.50 done
clear
D)
2.67 done
clear
View Solution play_arrow
question_answer 85)
For a gas, pressure p, volume v and temperature T are dependent on each other. Then which one of the following \[p\,-\,v\,-T\] relationships will be obeyed?
A)
\[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}\,{{\left( \frac{\partial v}{\partial T} \right)}_{p}}\,{{\left( \frac{\partial v}{\partial p} \right)}_{T}}\,=-\,\,1\] done
clear
B)
\[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}\,{{\left( \frac{\partial T}{\partial v} \right)}_{p}}\,{{\left( \frac{\partial v}{\partial p} \right)}_{T}}=-\,\,1\] done
clear
C)
\[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}\,{{\left( \frac{\partial v}{\partial T} \right)}_{p}}\,{{\left( \frac{\partial p}{\partial v} \right)}_{T}}=-\,\,1\] done
clear
D)
\[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}={{\left( \frac{\partial T}{\partial v} \right)}_{p}}\,{{\left( \frac{\partial p}{\partial v} \right)}_{T}}\] done
clear
View Solution play_arrow
question_answer 86)
A battery is used to light a bulb, run a fan and heat an electric iron in case of a power failure. If each of the above systems has 100 W rating and is run for 15 minutes, what are the work done (W) and heat transferred (Q) by the battery'?
A)
W = 90 kJ and Q = 90 kJ done
clear
B)
W = 180 kJ and Q = 0 done
clear
C)
W = 270 kJ and Q = 0 done
clear
D)
W = 90 kJ and Q = 180 kJ done
clear
View Solution play_arrow
question_answer 87)
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II A. Heat 1. PMM-2 B. Engine 2. High grade energy C. Stirring work 3. Variable flow D. Mechanical work 4. Nernst-Simon statement 5. Dissipative 6. Inexact differential 7. PMM-1
Codes:
A)
A\[\to \]2, B\[\to \]5, C\[\to \]4, D\[\to \]3 done
clear
B)
A\[\to \]2, B\[\to \]1, C\[\to \]5, D\[\to \]7 done
clear
C)
A\[\to \]6, B\[\to \]5, C\[\to \]4, D\[\to \]2 done
clear
D)
A\[\to \]6, B\[\to \]1, C\[\to \]5, D\[\to \]2 done
clear
View Solution play_arrow
question_answer 88)
A system undergoes a change of state during which 100 kJ of heat is transferred to it and it does 50 kJ of work. The system is brought back to its original state through a process during which 120 kJ of heat is transferred to it. What is the work done by the system?
A)
50 kJ done
clear
B)
70 kJ done
clear
C)
120 kJ done
clear
D)
170 kJ done
clear
View Solution play_arrow
question_answer 89)
A reversible engine exchanges heat from three thermal reservoirs A, B and C at 1000 K, 800 K and 200 K respectively. If the engine receives 500 kJ from .A and 400 kJ from B, then what is the heat exchanged from thermal reservoir C?
A)
450 kJ rejected to thermal reservoir C done
clear
B)
350 kJ rejected to thermal reservoir C done
clear
C)
250 kJ rejected to thermal reservoir C done
clear
D)
200 kJ rejected to thermal reservoir C done
clear
View Solution play_arrow
question_answer 90)
A 100Q resistor carrying a constant current of 0.5 A is kept at a constant temperature of 300 K by a stream of cooling water. In a time interval of 30 minutes, what are the changes in entropy for the resistor and that of the universe, respectively?
A)
0 and 150 J/K done
clear
B)
150 J/K and 0 done
clear
C)
300 J/K and 0 done
clear
D)
0 and 300 J/K done
clear
View Solution play_arrow
question_answer 91)
A system of 100 kg mass undergoes a process in which its specific entropy increase's from 0.30 kJ/kg K to 0.35 kJ/kg K. At the same time, the entropy of the surroundings decreases from 80 kJ/K to 75 kJ/K. What is the type of this process?
A)
Reversible done
clear
B)
Irreversible done
clear
C)
Impossible done
clear
D)
Not identifiable with the data given done
clear
View Solution play_arrow
question_answer 92)
Two reversible engines are working in series between a high temperature reservoir at 1000 K and a low temperature reservoir at 300 K in such a way that the heat rejected by the preceding engine is completely absorbed by the succeeding engine and both the engines develop the same amount of work per cycle. What is the intermediate temperature between first and second engines?
A)
700 K done
clear
B)
650 K done
clear
C)
350 K done
clear
D)
Not possible to be estimated with the given data done
clear
View Solution play_arrow
question_answer 93)
Which one of the following is the correct statement?
A)
The Mach number is less than 1 at a point where the entropy is maximum whether it is Rayleigh or Fanno line. done
clear
B)
A normal shock can appear in subsonic flow. done
clear
C)
The downstream Mach number across a normal shock is mate than one. done
clear
D)
The stagnation pressure across a normal shock decreases. done
clear
View Solution play_arrow
question_answer 94)
What is/are the effect (s) of super saturation in nozzle flow?
1. It increases the mass flow. 2. It increases friction in the nozzle. 3. It increases exit velocity. 4. It reduces dryness fraction of steam.
Select the correct answer using the code given below:
A)
1 only done
clear
B)
1 and 3 done
clear
C)
1, 2 and 4 done
clear
D)
3 only done
clear
View Solution play_arrow
question_answer 95)
Consider the following statements:
A tube section diverging in the direction of fluid flow can be used as 1. Supersonic nozzle 2. Subsonic nozzle 3. Supersonic diffuser 4. Subsonic diffuser
Which of the statements given above is/are correct?
A)
1 only done
clear
B)
1 and 4 done
clear
C)
3 only done
clear
D)
2 and 3 done
clear
View Solution play_arrow
question_answer 96)
Which one of the following is the shock that occurs for an airplane travelling at supersonic speed?
A)
Normal shock done
clear
B)
Oblique shock done
clear
C)
Bow shock done
clear
D)
Air shock done
clear
View Solution play_arrow
question_answer 97)
What does choked flow through a steam nozzle mean?
1. Discharge is maximum 2. Discharge is zero 3. Throat velocity is sonic 4. Exit pressure is less than or equal to critical pressure
Select the correct answer using the code given below:
A)
1 only done
clear
B)
2 only done
clear
C)
1 and 3 only done
clear
D)
1, 3 and 4 done
clear
View Solution play_arrow
question_answer 98)
When a convergent-divergent nozzle is subjected to a pressure ratio \[{{{p}_{2}}}/{{{p}_{1}}}\;\] greater than the critical pressure ratio, what does the divergent section exhibit?
A)
Decreasing pressure done
clear
B)
Flow separation done
clear
C)
Normal shock done
clear
D)
Increasing pressure done
clear
View Solution play_arrow
question_answer 99)
What are the properties of a thermodynamic system, whose value for the entire system is equal to the sum of their values for individual parts of the system?
A)
Thermodynamic properties done
clear
B)
Extensive properties done
clear
C)
Intensive properties done
clear
D)
None of the above done
clear
View Solution play_arrow
question_answer 100)
A new temperature scale in degrees N is to be defined. The boiling and freezing points of water on this scale are \[400{}^\circ N\] and \[100{}^\circ N\] respectively. What will be the reading on new scale corresponding to \[60{}^\circ C?\]
A)
\[110{}^\circ N\] done
clear
B)
\[180{}^\circ N\] done
clear
C)
\[210{}^\circ N\] done
clear
D)
\[280{}^\circ N\] done
clear
View Solution play_arrow
question_answer 101)
Which of the following thermodynamic properties relate to the Clausius-Clapeyron equation?
1. Pressure 2. Temperature 3. Entropy 4. Specific volume 5. Enthalpy 6. Internal energy
Select the correct answer using the code given below:
A)
1, 2, 6, 5 done
clear
B)
4, 2, 3, 5 done
clear
C)
6, 4, 1 done
clear
D)
4, 5, 2, 1 done
clear
View Solution play_arrow
question_answer 102)
Which one of the following is heat absorbed or rejected during a polytropic process?
A)
\[\left( \frac{\gamma -n}{\gamma -1} \right)\times \] work done done
clear
B)
\[{{\left( \frac{\gamma -n}{\gamma -1} \right)}^{2}}\times \] work done done
clear
C)
\[{{\left( \frac{\gamma -n}{\gamma -1} \right)}^{3}}\times \] work done done
clear
D)
\[\left( \frac{\gamma -n}{1-n} \right)\times \]work done done
clear
View Solution play_arrow
question_answer 103)
During a cycle comprising four processes, the heat transfers during three processes are \[+\,\,45\,\,kJ,\] \[-\,\,30\,\,kJ,\] \[-\,\,25\,\,kJ.\] what should be the heat transfer during the fourth process so that the network done during the cycle is zero?
A)
Zero done
clear
B)
\[+\,\,10\,\,kJ\] done
clear
C)
\[-\,\,10\,\,kJ\] done
clear
D)
\[-\,\,20\,\,kJ\] done
clear
View Solution play_arrow
question_answer 104)
Which thermometer is independent of the substance or material used in its construction?
A)
Mercury thermometer done
clear
B)
Alcohol thermometer done
clear
C)
Ideal gas thermometer done
clear
D)
Resistance thermometer done
clear
View Solution play_arrow
question_answer 105)
A closed system undergoes a process during which 150 kJ of heat is added to it. The system is then restored to its initial state. If the heat transfer and work transfer for the second process are \[-\,\,50\,\,kJ\] and \[+\,\,75\,\,kJ\] respectively, what is the work transfer for the first process?
A)
25 kJ done
clear
B)
50 kJ done
clear
C)
75 kJ done
clear
D)
100 kJ done
clear
View Solution play_arrow
question_answer 106)
A heat engine in a thermodynamic cycle draws 500 kJ of heat energy from a source at 1000 K per cycle and rejects certain amount of heat energy at 300 K per cycle. Then, which one of the following is correct?
A)
The amount of heat energy rejected must be 150 kJ done
clear
B)
The amount of heat energy rejected must be less than 150 kJ done
clear
C)
(e) The amount of heat energy rejected must be greater than 150 kJ done
clear
D)
It is not possible to make any statement regarding the amount of heat energy rejected per cycle from the data given done
clear
View Solution play_arrow
question_answer 107)
An ideal heat pump and an ideal refrigerator, which are reversible in operation, operate between same upper and lower temperature limits. If the coefficient of performance of the refrigerator is 4.5, then what is the coefficient of performance of the heat pump
A)
3.5 done
clear
B)
5.5 done
clear
C)
2.5 done
clear
D)
6.5 done
clear
View Solution play_arrow
question_answer 108)
Air standard diesel cycle has a compression ratio of 14 and cut-off takes place at 6% of the stroke. What is the cut-off ratio?
A)
0.60 done
clear
B)
0.78 done
clear
C)
1.78 done
clear
D)
None of the above done
clear
View Solution play_arrow
question_answer 109)
The thermal efficiency of the Carnot engine is 0.5. If the engine is operated as refrigerator, what is the COP of the refrigerator?
A)
0.5 done
clear
B)
1.0 done
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C)
2.0 done
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D)
25 done
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question_answer 110)
In a reversible isothermal expansion process, the fluid expands, from 10 bar and \[2\,{{m}^{3}}\] to 2 bar and \[10\,{{m}^{3}}.\] during the process the heat supplied is at the rate of 100 kW. What is the rate of work done during the process?
A)
20 kW done
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B)
35 kW done
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C)
80 kW done
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D)
100 kW done
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question_answer 111)
A system undergoes a change of state during which 80 kJ of heat is transferred to it and it does 60 kJ of work. The system is brought hack to its original slate through a process during which 100 kJ of heat is transferred to it. The work done by the system is:
A)
40 kJ done
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B)
60 KJ done
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C)
120 kJ done
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D)
180 kJ done
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question_answer 112)
Thermodynamic work is the product of:
A)
Two intensive properties done
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B)
Two extensive properties done
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C)
An intensive property and change in an extensive property done
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D)
An extensive property and change in an intensive property done
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question_answer 113)
A reversible heat engine operating between hot and cold reservoirs delivers a work output of 54 kJ white it rejects a heat of 66 kJ. The efficiency of this engine
A)
0.45 done
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B)
0.66 done
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C)
0.75 done
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D)
0.82 done
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question_answer 114)
Which one of the following expressions for Tds is true for a simple compressible substance? (Notations have the usual meaning)
A)
\[dh-vdp\] done
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B)
\[dh+vdp\] done
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C)
\[dh-pdv\] done
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D)
\[dh+pdv\] done
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question_answer 115)
If a pure substance contained in a rigid vessel passes through the critical state on heating, its initial state should be:
A)
Sub cooled water done
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B)
Saturated water done
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C)
Wet steam done
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D)
Saturated steam done
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question_answer 116)
Which one of the following is the correct expression for change in the internal energy for a small temperature change \[\Delta T\] for an ideal gas?
A)
\[\Delta u={{c}_{v}}\times \Delta T\] done
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B)
\[\Delta u={{c}_{p}}\times \Delta T\] done
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C)
\[\Delta u=\frac{{{c}_{p}}}{{{c}_{v}}}\times \Delta T\] done
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D)
\[\Delta u=\left( {{c}_{p}}-{{c}_{v}} \right)\Delta T\] done
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question_answer 117)
Which of the following are pure substances?
1. Steam and water mixture in a container 2. Atmospheric air 3. Air and liquid air in a container 4. Gaseous combustion products Select the correct answer using the codes given below:
Codes:
A)
1, 2 and 3 and 4 done
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B)
2, 3 and 4 done
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C)
1, 3 and 4 done
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D)
1, 2 and 4 done
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question_answer 118)
The entropy of a mixture of pure gases is the sum of The entropies of constituents evaluated at:
A)
Temperature and pressure of the mixture done
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B)
Temperature of the mixture and the partial pressure of the constituents done
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C)
Temperature and volume of the mixture done
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D)
Pressure and volume of the mixture done
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question_answer 119)
The Gibbs free-energy function is a property comprising:
A)
Pressure, volume and temperature done
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B)
Enthalpy, temperature and entropy done
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C)
Temperature, pressure and enthalpy done
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D)
Volume, enthalpy and entropy done
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question_answer 120)
An electric motor of 5 kW is subjected to a braking test for 1 hour. The heat generated by the frictional forces in the process is transferred to the surroundings \[20{}^\circ C.\] The resulting entropy change will be:
A)
22.1 kJ/K done
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B)
30.2 kJ/K done
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C)
61.4 kJ/K done
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D)
82.1 kJ/K done
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