Railways NTPC (Technical Ability) Thermodynamics and Heat Transfer Question Bank

done Thermodynamics and Heat Transfer Total Questions - 37

• question_answer1)
  The first law of thermodynamics is the law of
  A)
   conservation of mass done clear
  B)
   conservation of energy done clear
  C)
   conservation of momentum done clear
  D)
   conservation of heat done clear
  View Solution play_arrow

• question_answer2)
  First law of thermodynamics
  A)
   enables to determine change in internal energy to the system done clear
  B)
   does not help to predict whether the system will or not undergo a change done clear
  C)
   does not enable to determine change in entropy done clear
  D)
   All of the above done clear
  View Solution play_arrow

• question_answer3)
  Stirling and Ericsson cycles are
  A)
   reversible cycles done clear
  B)
   irreversible cycles done clear
  C)
   quasi-static cycles done clear
  D)
   semi-reversible cycles done clear
  View Solution play_arrow

• question_answer4)
  Carnot cycle is
  A)
   a reversible cycle done clear
  B)
   an irreversible cycle done clear
  C)
   a semi-reversible cycle done clear
  D)
   a quasi static cycle done clear
  View Solution play_arrow

• question_answer5)
  Change in the internal energy of small temperature change\[\Delta T\]for ideal gas is expressed by the relation
  A)
  \[\Delta U={{C}_{v}}\times \Delta T\] done clear
  B)
  \[\Delta \,U={{C}_{P}}\times \Delta T\] done clear
  C)
  \[\Delta \,U=\frac{{{C}_{p}}}{{{C}_{v}}}\Delta T\]               done clear
  D)
  \[\Delta U=({{C}_{p}}-{{C}_{v}})\,\Delta T\] done clear
  View Solution play_arrow

• question_answer6)
  If a heat engine attains 100% thermal efficiency, it violates
  A)
   zero the law of thermodynamics done clear
  B)
   first law of thermodynamics done clear
  C)
   second law of thermodynamics done clear
  D)
   law of conservation of energy done clear
  View Solution play_arrow

• question_answer7)
  A petrol engine theoretically operates on
  A)
   constant pressure cycle done clear
  B)
   constant volume cycle done clear
  C)
   constant temperature done clear
  D)
   constant entropy cycle done clear
  View Solution play_arrow

• question_answer8)
  Which of the following is not an extensive property
  A)
   entropy             done clear
  B)
   enthalpy done clear
  C)
   internal energy   done clear
  D)
   density done clear
  View Solution play_arrow

• question_answer9)
  For reversible adiabatic process, change in entropy is
  A)
   maximum                     done clear
  B)
   minimum done clear
  C)
   zero                              done clear
  D)
   unpredictable done clear
  View Solution play_arrow

• question_answer10)
  Heat added in a reversible adiabatic process is equal to
  A)
   \[{{p}_{1}}{{V}_{1}}\,\,\log \,\,\frac{{{V}_{1}}}{{{V}_{2}}}\] done clear
  B)
   \[{{C}_{V}}\,\,\left( \frac{\gamma -n}{1-n} \right)\,\,({{T}_{2}}-{{T}_{1}})\] done clear
  C)
   Zero done clear
  D)
   \[{{C}_{V}}\,\,\left( {{T}_{2}}-{{T}_{1}} \right)\] done clear
  View Solution play_arrow

• question_answer11)
  Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant
  A)
   pressure                        done clear
  B)
   temperature done clear
  C)
   volume             done clear
  D)
   internal energy done clear
  View Solution play_arrow

• question_answer12)
  What are the limitations to the signs of heat exchange from hot and cold reservoirs if a two-temperature machine operates between two negative temperatures?
  A)
   Heat must be rejected to hot source and abstracted from cold source done clear
  B)
   Heat must be abstracted from hot source and rejected to cold source done clear
  C)
   Heat must be rejected to both the sources done clear
  D)
   No limitation done clear
  View Solution play_arrow

• question_answer13)
  Ericsson cycle consists of the following four processes
  A)
   two isothermals and two isentropics done clear
  B)
   two isothermals and two constant volumes done clear
  C)
   two isothermals and two constant pressures done clear
  D)
   two adiabatics and two constant pressures done clear
  View Solution play_arrow

• question_answer14)
  Otto cycle consists of following four processes
  A)
   two isothermals and two isentropics done clear
  B)
   two isentropics and two constant volumes done clear
  C)
   two insentropics and one constant volume and one constant pressure done clear
  D)
   Two isentropics and two constant pressures done clear
  View Solution play_arrow

• question_answer15)
  The cyclic integral of\[(\delta Q-\delta W)\]for a process is equal to
  A)
   positive             done clear
  B)
   negative                                             done clear
  C)
   zero                                                     done clear
  D)
   positive or negative depending upon the type of process done clear
  View Solution play_arrow

• question_answer16)
  Atkinson gas engine has a special feature that
  A)
   isentropic compression and expansion are of equal stroke lengths done clear
  B)
   isentropic compression is on a short stroke and the expansion on a longer stroke done clear
  C)
   isentropic compression is on a longer stroke and the expansion on a short stroke done clear
  D)
   it employes shortest compression and expansion Strokes done clear
  View Solution play_arrow

• question_answer17)
  An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
  A)
    feasible done clear
  B)
   impossible done clear
  C)
   possible done clear
  D)
   possible, but with lot of sophistications done clear
  View Solution play_arrow

• question_answer18)
  The basis for measuring thermodynamic property of temperature is given by
  A)
   zeroth law of thermodynamics done clear
  B)
   first law of thermodynamics done clear
  C)
   second law of thermodynamics done clear
  D)
   third law of thermodynamics done clear
  View Solution play_arrow

• question_answer19)
  The ideal efficiency of a Stirling cycle with perfect regeneration and operating between two given temperature limits is
  A)
   equal to Carnot cycle     done clear
  B)
   less than Carnot cycle done clear
  C)
   equal to Brayton cycle done clear
  D)
   equal to Joule cycle done clear
  View Solution play_arrow

• question_answer20)
  Thermal power plant works on
  A)
   Carnot cycle                  done clear
  B)
   Joule cycle done clear
  C)
   Rankine cycle    done clear
  D)
   Otto cycle done clear
  View Solution play_arrow

• question_answer21)
  When a process undergoes a complete cycle then the change of entropy will be
  A)
   \[+ve\]value done clear
  B)
   \[-ve\]value done clear
  C)
   zero value done clear
  D)
   \[+ve\]or \[-ve\]depending on initial condition done clear
  View Solution play_arrow

• question_answer22)
  What are the limitations to the signs of heat exchange from hot cold reservoirs if a two-temperature machine operates between two Positive temperatures
  A)
   heat must be rejected to hot source and abstracted from cold source done clear
  B)
   heat must be abstracted from hot source and rejected to cold source done clear
  C)
   heat must be rejected to both the sources done clear
  D)
   heat must be abstracted from both the sources done clear
  View Solution play_arrow

• question_answer23)
  The ideal efficiency of Joule cycle operating between two given temperature limits is
  A)
   equal to Joule cycle done clear
  B)
   equal to Camot cycle done clear
  C)
   equal to Brayton cycle done clear
  D)
   less than Camot cycle done clear
  View Solution play_arrow

• question_answer24)
  A Bell-Coleman cycle is a reversed
  A)
   Carnot cycle                  done clear
  B)
   Otto cycle done clear
  C)
   Joule cycle                    done clear
  D)
   Stirling cycle done clear
  View Solution play_arrow

• question_answer25)
  Diesel cycle consists of following four processes
  A)
   two isothermals and two isentropics done clear
  B)
   two isentropics, one constant volumes - done clear
  C)
   two isentropics, one constant volume and one constant pressure done clear
  D)
   two isentropics and two constant pressures done clear
  View Solution play_arrow

• question_answer26)
  Which of the following is not a property of thermodynamic system?
  A)
   Pressure                        done clear
  B)
   Energy done clear
  C)
   Heat                            done clear
  D)
   Volumes saws done clear
  View Solution play_arrow

• question_answer27)
  Stirling and Ericsson cycles are:
  A)
   irreversible cycles done clear
  B)
   quasi - static cycles done clear
  C)
   semi - reversible cycles done clear
  D)
   reversible cycles done clear
  View Solution play_arrow

• question_answer28)
  In thermodynamic cycle, heat is rejected at:
  A)
   constant volume            done clear
  B)
   constant pressure done clear
  C)
   constant enthalpy          done clear
  D)
   constant temperature done clear
  View Solution play_arrow

• question_answer29)
  Which of the following cycle consists of three processes?
  A)
   Ericsson cycle    done clear
  B)
   Stirling cycle done clear
  C)
   Alkinson cycle   done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer30)
  Zeroth law of thermodynamics deals with:
  A)
   concept of temperature done clear
  B)
   enthalpy done clear
  C)
   entropy done clear
  D)
   external and internal energy both done clear
  View Solution play_arrow

• question_answer31)
  Which of the following gives the correct relation between centigrade and fahrenheit scales?
  A)
   \[C=\frac{5}{9}\,\,(F-32)\]         done clear
  B)
   \[C=\frac{5}{9}\,\,(F+32)\] done clear
  C)
   \[F=\frac{5}{9}\,\,(F+32)\]        done clear
  D)
   \[C=\frac{9}{5}\,\,(F-32)\] (c = degree centigrade, F = degree Fahrenheit) done clear
  View Solution play_arrow

• question_answer32)
  Properties of substances like pressure, temperature and density in thermodynamic co-ordinates are:
  A)
   Path function                done clear
  B)
   Point function done clear
  C)
   Cyclic function. done clear
  D)
   Real function done clear
  View Solution play_arrow

• question_answer33)
  Heat is being supplied to air in a cylinder filled with frictionless piston held by a constant weight. The process will be:
  A)
   Isochoric                       done clear
  B)
   Isothermal done clear
  C)
   Isobaric            done clear
  D)
   Adiabatic done clear
  View Solution play_arrow

• question_answer34)
  Heat and work are:
  A)
   Point function    done clear
  B)
   System properties done clear
  C)
   Path function                done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer35)
  Which of the following in an irreversible process?
  A)
   Isothermal process          done clear
  B)
   Isentrobic process done clear
  C)
   Isoparic process done clear
  D)
   Isenthalpic process done clear
  View Solution play_arrow

• question_answer36)
  First Law of thermodynamics depicts the relation between
  A)
   heat and work done clear
  B)
   heat, work and system properties done clear
  C)
   various properties of the system done clear
  D)
   various thermodynamics processes done clear
  View Solution play_arrow

• question_answer37)
  If Q = Heat content of a gas, u = Internal energy P = Pressure, V = Volume, T = Temperature then which of the following statement is applicable to perfect gas and is also true for an irreversible process?
  A)
   \[dQ=dU+qdV\]            done clear
  B)
   \[Tds=dU+PdV\] done clear
  C)
   \[dQ=Tds\]                   done clear
  D)
   \[dQ=Tds+dU\] done clear
  View Solution play_arrow