Temperature Measurement Multiple Choice Questions

1. Reference junction compensation is necessary in thermocouple-based temperature instruments because ___________ 
a) Copper extension wire has a tendency to corrode
b) Thermocouples are inherently nonlinear
c) The reference junction generates a temperature-dependent voltage
d) The junction’s electrical resistance varies with temperature
Answer: The reference junction generates a temperature-dependent voltage
2. Which of the following is made up of mixtures of pure oxides of iron and nickel?
a) Thermistors
b) Mercury thermometers
c) Radiation thermometers
d) Metallic thermometers
Answer: Thermistors
3. The heat control at large-scale in the fermenter is carried out by _________
a) Inter heating coils
b) Heating jacket
c) Controlled bath
d) Cold-water circulation
Answer: Cold-water circulation
4. The negative lead of a thermocouple is always colored
a) Blue
b) Yellow
c) Red
d) White
Answer: Red
5. The resistance _________ with increase in temperature.
a) Increases
b) Decreases
c) Becomes constant
d) Becomes zero
Answer: Increases
6. The temperature control system which maintains the temperature of a room at 30 °C when it is set is an example of_____
a) Open loop system
b) Closed loop system
c) Both a. and b.
d) None of the above
Answer: Closed loop system
7. Ratio of net amount of heat received and stored in the body for certain time interval is known as _________________
a) Temperature
b) Thermal coefficient
c) Thermal storage capacity
d) None of the mentioned
Answer: Thermal storage capacity
8. If the two metals have different temperature coefficient then, they are useful in making _________
a) Manometric thermometer
b) Gas thermometer
c) Bimetallic thermometer
d) Digital thermometer
Answer: Bimetallic thermometer
9. Which of the following temperature sensors is not used for a temperature measurement?
a) Non-electrical type
b) Electrical type
c) Magnetic type
d) Radiation type
Answer: Magnetic type
10. The most rugged temperature sensing element listed here is a/an ___________
a) Thermocouple
b) Orifice plateo
c) RTD
d) Filled bulb
Answer: Thermocouple
11. Which of the following sensor is used to measure the change in flow rate?
a) Temperature
b) Weight
c) Medium analysis
d) Exit-gas analysis
Answer: Weight
12. IPTS stands for ________________
a) International Practical Temperature Scale
b) Indian Primary Temperature Scale
c) International Primary Temperature Scale
d) International Practical Temperature Standard
Answer: International Practical Temperature Scale
13. Convert a temperature measurement of 250 deg C into Kelvin.
a) 523.2 K
b) -209.7 K
c) 709.7 K
d) -23.2 K
Answer: 523.2 K
14. When the reference junction is the same temperature as the measurement junction in a thermocouple circuit, the output voltage (measured by the sensing instrument) is ___________
a) Zero
b) Reverse polarity
c) Noisy
d) AC instead of DC
Answer: Zero
15. Output of a bimetallic element will be __________________
a) Strain
b) Pressure
c) Displacement
d) Voltage
Answer: Displacement
16. Which of the following is used as indication instrument in a liquid expansion system?
a) Bellows
b) Bourdon tube
c) Ammeter
d) Thermometer
Answer: Bourdon tube
17. Latent heat is ___________ 
a) The heat required to raise the temperature of a substance
b) The amount of heat energy present in ambient conditions
c) The potential energy residing in a sample of unburnt fuel
d) The heat released when a gas suddenly decreases pressure
Answer: The heat required to make a substance change phase
18. A type J thermocouple is made of the following metals ___________ 
a) Aluminum and Tungsten
b) Iron and Constantan
c) Platinum and Platinum/Rhodium alloy
d) Copper and Constantan
Answer: Iron and Constantan
19. Which of the following can be used for measuring temperature?
a) Metallic diaphragm
b) Fluid expansion system
c) Capsule
d) Bourdon tube
Answer: Fluid expansion system
20. In liquid in steel bulb thermometer, which liquid can be used for measuring temperature up to 60000C?
a) Mercury
b) Ether
c) Water
d) None of the mentioned
Answer: Mercury
21. Which of the following is true for bimetallic type thermometer?
a) Two metals have same temperature coefficients
b) Two metals have different temperature coefficient
c) One metal is cooled always
d) None of the mentioned
Answer: Two metals have different temperature coefficient
22. Thermocouple extension wire may be readily distinguished from regular thermocouple-grade wire by ___________ 
a) Different metal types
b) Outer sheath color
c) Special markings on the wire’s insulation
d) Thickness
Answer: Outer sheath color
23. Analogous quantities of heat flow and temperature in electrical are _____________ and _______________
a) Potential and current
b) Current and potential
c) Power and potential
d) Current and power
Answer: Current and potential
24. Heat transfer coefficient of a material with length l is _________
a) K/l
b) l/K
c) 1/K
d) Kl
Answer: K/l
25. Identify the thermocouple type with the highest temperature limit from those listed here
a) Type J
b) Type K
c) Type S
d) Type T
Answer: Type S
26. A “thermowell” is a ___________ 
a) Heat sink
b) Small vessel for holding liquids at high temperature
c) Protective tube for a temperature sensing element
d) Temperature sensing device
Answer: Protective tube for a temperature sensing element
27. When bimetallic thermometer heated, curling occurs to the side of metal with least temperature coefficients.
a) True
b) False
Answer: True
28. IPTS stands for International Practical Temperature Scale
a) True
b) False
Answer: True
29. The two metals have different temperature coefficient then, they are useful in making Manometric thermometer
a) True
b) False
Answer: False
30. A type J thermocouple is made of the Iron and Constantan metals
a) True
b) False
Answer: True