Resistance Temperature Detector

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Resistance Temperature Detector”.

1. Resistance temperature detector is ___________
a) a electrical transducer
b) a mechanical transducer
c) a chemical transducer
d) a physical transducer

2. Relation between temperature and resistance of a conductor is ________
a) Rt = Rref [1+t]
b) Rt = Rref [1+α∆t]
c) Rt = Rref [1-αt]
d) Rt = Rref [1-t]

3. Sensing element in the thermometer must provide ________
a) small change in resistance
b) no change in resistance
c) large change in resistance
d) infinite change in resistance

4. Platinum is used for industrial applications because ________
a) it is cheap
b) it is available readily
c) it is a noble metal
d) it gives accurate measurements

5. Resistance thermometer provides the change in electrical resistance.
a) True
b) False

6. If the sensing element is large, then less amount of heat is required.
a) True
b) False

7. Most metallic conductors have a ________
a) neutral temperature coefficient of resistance
b) negative temperature coefficient of resistance
c) positive temperature coefficient of resistance
d) zero temperature coefficient of resistance

8. In a temperature sensing element ________
a) low value of α is required
b) infinite value of α is required
c) α must be zero
d) high value of α is required

9. Nickel and its alloys can be used over a temperature range of ________
a) 100 to 450 K
b) 10 to 50 K
c) 0 to 25 K
d) 5 to 15 K

10. How can corrosion be prevented in a resistance thermometer?
a) by immersing the setup in oil
b) by enclosing the elements in a glass tube
c) by using guard rings
d) by painting the elements

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