-
question_answer1)
The production of e.m.f. by maintaining a difference of temperature between the two junctions of two different metals is known as
A)
Joule effect done
clear
B)
Seebeck effect done
clear
C)
Peltier effect done
clear
D)
Thomson effect done
clear
View Solution play_arrow
-
question_answer2)
When a current passes through the junction of two different metals, evolution or absorption of heat at the junction is known as [MP PMT/PET 1998]
A)
Joule effect done
clear
B)
Seebeck effect done
clear
C)
Peltier effect done
clear
D)
Thomson effect done
clear
View Solution play_arrow
-
question_answer3)
When a current passes through a wire whose different parts are maintained at different temperatures, evolution or absorption of heat all along the length of wire is known as
A)
Joule effect done
clear
B)
Seebeck effect done
clear
C)
Peltier effect done
clear
D)
Thomson effect done
clear
View Solution play_arrow
-
question_answer4)
The thermocouple is based on the principle of [MP PET 1984; AFMC 1998; BCECE 2003]
A)
Seebeck effect done
clear
B)
Thomson effect done
clear
C)
Peltier effect done
clear
D)
Joule effect done
clear
View Solution play_arrow
-
question_answer5)
For a thermocouple, the neutral temperature is \[270{}^\circ C\] and the temperature of its cold junction is \[20{}^\circ C\]. If there is no deflection in the galvanometer, the temperature of the hot junction should be [AMU Engg. 2000]
A)
\[210{}^\circ C\] done
clear
B)
\[540{}^\circ C\] done
clear
C)
\[520{}^\circ C\] done
clear
D)
\[209{}^\circ C\] done
clear
View Solution play_arrow
-
question_answer6)
Thermocouple is a device for the measurement of
A)
Absolute temperature of a metal done
clear
B)
The temperature difference between two substances done
clear
C)
The couple acting on a wire done
clear
D)
Thermal conductivity of a substance done
clear
View Solution play_arrow
-
question_answer7)
The true statement for thermo e.m.f. of a thermocouple
A)
Depends on the nature of metals done
clear
B)
Depends only on temperature of cold junction done
clear
C)
Depends only on temperature of hot junction done
clear
D)
Depends on the length of the wires used for thermocouple done
clear
View Solution play_arrow
-
question_answer8)
The direction of current in an iron-copper thermocouple is [MP PET 1995]
A)
From copper to iron at the hot junction done
clear
B)
From iron to copper at the hot junction done
clear
C)
From copper to iron at cold junction done
clear
D)
No current will flow done
clear
View Solution play_arrow
-
question_answer9)
Peltier coefficient for the junction of a pair of metals is proportional to [MP PMT 1993; MP PET 1997]
A)
T absolute temperature of the junction done
clear
B)
Square of absolute temperature of the junction done
clear
C)
\[\frac{1}{\text{Absolute temperature of the junction}}\] done
clear
D)
\[\frac{1}{\text{Square of absolute temperature of the junction}}\] done
clear
View Solution play_arrow
-
question_answer10)
If for a thermocouple \[{{T}_{n}}\] is the neutral temperature, \[{{T}_{c}}\] is the temperature of the cold junction and \[{{T}_{i}}\] is the temperature of inversion, then [MP PET 2001; AIEEE 2002]
A)
\[{{T}_{i}}=2{{T}_{n}}-{{T}_{c}}\] done
clear
B)
\[{{T}_{n}}={{T}_{i}}-2{{T}_{c}}\] done
clear
C)
\[{{T}_{i}}={{T}_{n}}-{{T}_{c}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer11)
For a thermocouple, the temperature of inversion is that temperature at which thermo e.m.f. is
A)
Zero done
clear
B)
Maximum done
clear
C)
Minimum done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer12)
For a given thermocouple, the thermo e.m.f. can be
A)
Zero done
clear
B)
Positive done
clear
C)
Negative done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer13)
When current is passed in antimony-bismuth couple, then
A)
The junction becomes hot when the current is from bismuth to antimony done
clear
B)
The junction becomes hot when current flows from antimony to bismuth done
clear
C)
Both junctions become hot done
clear
D)
Both junctions become cold done
clear
View Solution play_arrow
-
question_answer14)
A thermocouple is made of Cu and Fe. If a battery is connected in it, then
A)
Both junctions will be at the same temperature done
clear
B)
Both junctions will become hot done
clear
C)
One junction will be hotter than the other done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer15)
Thermopile is used for
A)
Collecting the heat energy done
clear
B)
The measurement of radiant heat energy done
clear
C)
The measurement of current done
clear
D)
The change of atomic energy into heat energy done
clear
View Solution play_arrow
-
question_answer16)
When a current of 1 ampere is passed through a conductor whose ends are maintained at temperature difference of \[1{}^\circ C\], the amount of heat evolved or absorbed is called
A)
Peltier coefficient done
clear
B)
Thomson coefficient done
clear
C)
Thermoelectic power done
clear
D)
Thermo e.m.f. done
clear
View Solution play_arrow
-
question_answer17)
In a thermocouple, the temperature that does not depend on the temperature of the cold junction is called
A)
Neutral temperature done
clear
B)
Temperature of inversion done
clear
C)
Both the above done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer18)
At neutral temperature, the thermoelectric power \[\left( \frac{dE}{dT} \right)\] has the value [MP PET 2003; MP PMT 2004]
A)
Zero done
clear
B)
Maximum but negative done
clear
C)
Maximum but positive done
clear
D)
Minimum but positive done
clear
View Solution play_arrow
-
question_answer19)
In Cu-Fe couple, the flow of current at the temperature of inversion is
A)
From Fe to Cu through the hot junction done
clear
B)
From Cu to Fe through the hot junction done
clear
C)
Maximum done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer20)
In Seebeck series Sb appears before Bi. In a \[Sb-Bi\] thermocouple current flows from [MP PET 1994]
A)
Sb to Bi at the hot junction done
clear
B)
Sb to Bi at the cold junction done
clear
C)
Bi to Sb at the cold junction done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer21)
Which of the following statement is correct [MP PET 1994]
A)
Both Peltier and Joule effects are reversible done
clear
B)
Both Peltier and Joule effects are irreversible done
clear
C)
Joule effect is reversible, whereas Peltier effect is irreversible done
clear
D)
Joule effect is irreversible, whereas Peltier effect is reversible done
clear
View Solution play_arrow
-
question_answer22)
For a given temperature difference, which of the following pairs will generate maximum thermo e.m.f. [MP PMT 1994]
A)
Antimony-bismuth done
clear
B)
Silver-gold done
clear
C)
Iron-copper done
clear
D)
Lead-nickel done
clear
View Solution play_arrow
-
question_answer23)
The cold junction of a thermocouple is maintained at \[10{}^\circ C\]. No thermo e.m.f. is developed when the hot junction is maintained at \[530{}^\circ C\]. The neutral temperature is [MP PMT 1994]
A)
\[260{}^\circ C\] done
clear
B)
\[270{}^\circ C\] done
clear
C)
\[265{}^\circ C\] done
clear
D)
\[520{}^\circ C\] done
clear
View Solution play_arrow
-
question_answer24)
Which of the following is not reversible [Manipal MEE 1995; DPMT 2001]
A)
Joule effect done
clear
B)
Peltier effect done
clear
C)
Seebeck effect done
clear
D)
Thomson effect done
clear
View Solution play_arrow
-
question_answer25)
Neutral temperature of a thermocouple is defined as the temperature at which [MP PMT 1996]
A)
The thermo e.m.f. changes sign done
clear
B)
The thermo e.m.f. is maximum done
clear
C)
The thermo e.m.f. is minimum done
clear
D)
The thermo e.m.f. is zero done
clear
View Solution play_arrow
-
question_answer26)
As the temperature of hot junction of a thermo‑couple is increased (while cold junction is at constant temperature), the thermo e.m.f.
A)
Increases uniformly at constant rate done
clear
B)
Increases slowly in the beginning and more rapidly at higher temperatures done
clear
C)
Increases more rapidly in the beginning but less rapidly at higher temperatures done
clear
D)
In minimum at neutral temperature done
clear
View Solution play_arrow
-
question_answer27)
As the temperature of hot junction increases, the thermo e.m.f. [MP PET 1999]
A)
Always increases done
clear
B)
Always decreases done
clear
C)
May increase or decrease done
clear
D)
Always remains constant done
clear
View Solution play_arrow
-
question_answer28)
The e.m.f. in a thermoelectric circuit with one junction at \[0{}^\circ C\] and the other at \[t{}^\circ C\] is given by \[E=At-B{{t}^{2}}\]. The neutral temperature is then [AMU 1995; BCECE 2004]
A)
\[\frac{A}{B}\] done
clear
B)
\[-\frac{A}{2B}\] done
clear
C)
\[-\frac{B}{2A}\] done
clear
D)
\[\frac{A}{2B}\] done
clear
View Solution play_arrow
-
question_answer29)
The temperature of cold junction and neutral temperature of a thermocouple are \[{{15}^{o}}C\] and \[{{280}^{o}}C\] respectively. The temperature of inversion is [AMU (Engg.) 1999]
A)
\[{{295}^{o}}C\] done
clear
B)
\[{{265}^{o}}C\] done
clear
C)
\[{{545}^{o}}C\] done
clear
D)
\[{{575}^{o}}C\] done
clear
View Solution play_arrow
-
question_answer30)
Above neutral temperature, thermo e.m.f. in a thermocouple [AMU (Engg.) 1999]
A)
Decreases with rise in temperature done
clear
B)
Increases with rise in temperature done
clear
C)
Remains constant done
clear
D)
Changes sign done
clear
View Solution play_arrow
-
question_answer31)
Consider the following two statements A and B, and identify the correct choice out of given answers A. Thermo e.m.f. is minimum at neutral temperature of a thermocouple B. When two junctions made of two different metallic wires are maintained at different temperatures, an electric current is generated in the circuit. [EAMCET (Med.) 2000]
A)
A is false and B is true done
clear
B)
A is true and B is false done
clear
C)
Both A and B are false done
clear
D)
Both A and B are true done
clear
View Solution play_arrow
-
question_answer32)
The temperature at which thermal electric power of a thermo couple becomes zero is called [MP PMT 2001]
A)
Inversion temperature done
clear
B)
Neutral temperature done
clear
C)
Junction temperature done
clear
D)
Null temperature done
clear
View Solution play_arrow
-
question_answer33)
Thomson coefficient of a conductor is \[10\mu V/K\]. The two ends of it are kept at \[{{50}^{o}}C\] and \[{{60}^{o}}C\] respectively. Amount of heat absorbed by the conductor when a charge of 10C flows through it is [EAMCET 2001]
A)
1000 J done
clear
B)
100 J done
clear
C)
100 mJ done
clear
D)
1 mJ done
clear
View Solution play_arrow
-
question_answer34)
For a thermocouple the neutral temperature is \[{{270}^{o}}C\] when its cold junction is at \[{{20}^{o}}C\]. What will be the neutral temperature and the temperature of inversion when the temperature of cold junction is increased to \[{{40}^{o}}C\] [Kerala PET 2001]
A)
\[{{290}^{o}}C,\,\,{{580}^{o}}C\] done
clear
B)
\[{{270}^{o}}C,\,\,{{580}^{o}}C\] done
clear
C)
\[{{270}^{o}}C,\,\,{{500}^{o}}C\] done
clear
D)
\[{{290}^{o}}C,\,\,{{540}^{o}}C\] done
clear
View Solution play_arrow
-
question_answer35)
Two ends of a conductor are at different temperatures the electromotive force generated between two ends is [MP PMT 2001; MP PET 2002]
A)
Seebeck electro motive force (e.m.f.) done
clear
B)
Peltier electro motive force (e.m.f.) done
clear
C)
Thomson electro motive force (e.m.f.) done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer36)
The neutral temperature of a thermocouple is \[{{350}^{o}}C\] when the cold junction is at \[{{0}^{o}}C.\] When the cold junction is immersed in a bath of \[{{30}^{o}}C,\] the inversion temperature is [Kerala (Med.) 2002]
A)
\[{{700}^{o}}C\] done
clear
B)
\[{{600}^{o}}C\] done
clear
C)
\[{{350}^{o}}C\] done
clear
D)
\[{{670}^{o}}C\] done
clear
View Solution play_arrow
-
question_answer37)
A thermoelectric refrigerator works on [JIPMER 2002]
A)
Joule effect done
clear
B)
Seeback effect done
clear
C)
Peltier effect done
clear
D)
Thermonic emission done
clear
View Solution play_arrow
-
question_answer38)
If the temperature of cold junction of thermocouple is lowered, then the neutral temperature [JIPMER 2002]
A)
Increases done
clear
B)
Approaches inversion temperature done
clear
C)
Decreases done
clear
D)
Remains the same done
clear
View Solution play_arrow
-
question_answer39)
Consider the following two statements A and B and identify the correct choice given in the answers Duddells thermo-galvanometer is suitable to measure direct current only Thermopile can measure temperature differences of the order of \[{{10}^{-3}}{{}^{o}}C\] [EAMCET 2003]
A)
Both A and B are true done
clear
B)
Both A and B are false done
clear
C)
A is true but B is false done
clear
D)
A is false but B is true done
clear
View Solution play_arrow
-
question_answer40)
If \[E=at+b{{t}^{2}},\] what is the temperature of inversion [DCE 2003]
A)
\[-\frac{a}{2b}\] done
clear
B)
\[+\frac{a}{2b}\] done
clear
C)
\[-\frac{a}{b}\] done
clear
D)
\[+\frac{a}{b}\] done
clear
View Solution play_arrow
-
question_answer41)
Antimony and bismuth are usually used in a thermocouple, because [MH CET 2003]
A)
Negative thermal e.m.f. produced done
clear
B)
Constant thermal e.m.f. produced done
clear
C)
Lower thermal e.m.f. produced done
clear
D)
Higher thermal e.m.f. produced done
clear
View Solution play_arrow
-
question_answer42)
The smallest temperature difference that can be measured with a combination of a thermocouple of thermo e.m.f. 30mV per degree and a galvanometer of 50 ohm resistance, capable of measuring a minimum current of 3 ´ 10?7 amp is [MP PET 2000]
A)
0.5 degree done
clear
B)
1.0 degree done
clear
C)
1.5 degree done
clear
D)
2.0 degree done
clear
View Solution play_arrow
-
question_answer43)
\[e=\alpha \,t-\frac{1}{2}\beta \,{{t}^{2}}\], If temperature of cold junction is \[{{0}^{o}}C\] then temperature of inversion is \[(\text{if }\alpha =500.0\mu V/{{}^{o}}C,\,\beta =5.0\mu V/\text{Squar}{{\text{e}}^{o}}C\]) [DCE 2001]
A)
100 done
clear
B)
200 done
clear
C)
300 done
clear
D)
400 done
clear
View Solution play_arrow
-
question_answer44)
If the emf of a thermocouple, one junction of which is kept 0°C is given by \[e=at+1/2\,\,b{{t}^{2}}\] then the neutral temperature will be [J & K CET 2005]
A)
a/b done
clear
B)
? a/b done
clear
C)
a/2b done
clear
D)
?1/ ab done
clear
View Solution play_arrow