Instrumentation Transducers

Thermo Electric Transducers

Question 1
Marks : +2 | -2
Pass Ratio : 40%
______________ describes current flow between two junctions formed by two different metals.
Peltier effect
Thomson effect
Seebeck effect
None of the mentioned
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.
Question 2
Marks : +2 | -2
Pass Ratio : 40%
Thermocouple cannot used for measurement of temperature of liquid.
True
False
Explanation:
Immersion type thermocouple can be used to measure temperature of liquid, in which thermocouple is immersed in liquid.
Question 3
Marks : +2 | -2
Pass Ratio : 20%
Total seebeck effect can be found as _____________
Total peltier effect
Total Thomson effect
Partly peltier and partly Thomson effect
None of the mentioned
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.
Question 4
Marks : +2 | -2
Pass Ratio : 20%
_________________ can be used as a replacement for thermocouple lead.
Replacement lead
Replica lead
Compensating lead
None of the mentioned
Explanation:
Compensating leads are of the same materials as thermocouple leads and can be used as a replacement.
Question 5
Marks : +2 | -2
Pass Ratio : 20%
Thermo couple cannot be used to measure ____________
Temperature of gas
Temperature of liquid
IR radiation
None of the mentioned
Explanation:
Infra-Red radiation is characterized by temperature and thermocouple can be used to measure temperature.
Question 6
Marks : +2 | -2
Pass Ratio : 20%
Thermocouple is a ______________
Primary device
Secondary transducer
Tertiary transducer
None of the mentioned
Explanation:
Thermocouple is a device which converts thermal energy to electrical energy and it can be treated as a primary device.
Question 7
Marks : +2 | -2
Pass Ratio : 20%
Peltier effect is reverse of seebeck effect.
True
False
Explanation:
Peltier effect and seebeck effect operations are reverse to each other.
Question 8
Marks : +2 | -2
Pass Ratio : 20%
Which of the following element is used as a thermocouple in nuclear reactor?
Boron
Platinum
Copper
Iron
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.
Question 9
Marks : +2 | -2
Pass Ratio : 20%
Operation of thermocouple is governed by _______________
Peltier effect
Seebeck effect
Thomson effect
All of the mentioned
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.
Question 10
Marks : +2 | -2
Pass Ratio : 20%
Amount of heat liberated or absorbed when 1A current passes is called ____________
Thomson coefficient
Peltier coefficient
Seebeck coefficient
None of the mentioned
Explanation:
Peltier coefficient relates heat liberated or absorbed and current flow.