This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Thermo Electric Transducers”.
1. Thermocouple is a ______________
a) Primary device
b) Secondary transducer
c) Tertiary transducer
d) None of the mentioned
View Answer
Explanation: Thermocouple is a device which converts thermal energy to electrical energy and it can be treated as a primary device.
2. Operation of thermocouple is governed by _______________
a) Peltier effect
b) Seebeck effect
c) Thomson effect
d) All of the mentioned
View Answer
Explanation: Operation of thermocouple is based on three major effects- Peltier, Thomson and seebeck, all describe the relation between current flow and temperature between two different metal.
3. ______________ describes current flow between two junctions formed by two different metals.
a) Peltier effect
b) Thomson effect
c) Seebeck effect
d) None of the mentioned
View Answer
Explanation: When two different metals are connected to form two junctions, current flow will occur from one junction to other. This is described by peltier effect.
4. Amount of heat liberated or absorbed when 1A current passes is called ____________
a) Thomson coefficient
b) Peltier coefficient
c) Seebeck coefficient
d) None of the mentioned
View Answer
Explanation: Peltier coefficient relates heat liberated or absorbed and current flow.
5. Total seebeck effect can be found as _____________
a) Total peltier effect
b) Total Thomson effect
c) Partly peltier and partly Thomson effect
d) None of the mentioned
View Answer
Explanation: All three effects, peltier, seebeck and Thomson effects are connected to each other, and total seebeck effect can be found as partly peltier and partly Thomson effect.
6. Which of the following element is used as a thermocouple in nuclear reactor?
a) Boron
b) Platinum
c) Copper
d) Iron
View Answer
Explanation: Nuclear reactors are places where a large amount of heat is liberated, here boron is used as thermocouple element as it can measure temperature above 15000c.
7. Thermocouple cannot used for measurement of temperature of liquid.
a) True
b) False
View Answer
Explanation: Immersion type thermocouple can be used to measure temperature of liquid, in which thermocouple is immersed in liquid.
8. _________________ can be used as a replacement for thermocouple lead.
a) Replacement lead
b) Replica lead
c) Compensating lead
d) None of the mentioned
View Answer
Explanation: Compensating leads are of the same materials as thermocouple leads and can be used as a replacement.
9. Thermo couple cannot be used to measure ____________
a) Temperature of gas
b) Temperature of liquid
c) IR radiation
d) None of the mentioned
View Answer
Explanation: Infra-Red radiation is characterized by temperature and thermocouple can be used to measure temperature.
10. Peltier effect is reverse of seebeck effect.
a) True
b) False
View Answer
Explanation: Peltier effect and seebeck effect operations are reverse to each other.
Sanfoundry Global Education & Learning Series – Instrumentation Transducers.
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