Temperature Transducers MCQs with answers: Following Multiple Choice Questions (MCQs) are based on “Temperature Transducers” such as RTD, Thermistors and Thermocouples. It is related with the subject Instrumentation or Industrial Measurement and Applications.
This topic is mostly beneficial in the field of Electronics, Electrical and Mechanical Engineering.
These MCQs will be useful in various competitive examinations, entrance examinations, oral examination (Viva voce), certifications and interviews.
MCQ on Temperature Measurement
Que.1 Identify the transducer not used for the measurement of temperature.
- Thermocouple
- RTD
- Pyrometer
- RVDT
✔ View Answer
Option 4: RVDT.
Explanation:A rotary variable differential transformer (RVDT) is a type of electrical transformer used for measuring angular displacement.
Que.2 Full form of RTD is
- Resistance Thermistor Detector
- Resistance Temperature Detector
- Round Temperature Detector
- Resistance Thermometer
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Option 2: Resistance Temperature Detector
Que.3 Consider the following statements about RTD.
(i) The spool of wire is chosen chemically and dimensionally stable in the sensing range.
(ii) The wire is made thick for high strength.
- Only statement (i) is correct.
- Only statement (ii) is correct.
- Both statements are correct.
- Both statements are wrong.
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Option 1: Only statement (i) is correct.
Explanation:The wire used in RTD is made thin and long to increase resistance.
Large resitance range can be easily converted into electrical signal that can further be used to increase accuracy.
Que.4 Platinum is preferred for RTD because
- It is chemically stable at high temperatures.
- Platinum resists oxidation.
- It can withstand severe environmental conditions.
- All of the above
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Option 4: All of the above
Que.5 Identify the incorrect statement about limitation/s for Nickel and Copper wire in case of RTD.
- They are expensive.
- Thin wires of high chemical purity can be obtained.
- Wire length needed is long due to high conductivity.
- None of the above.
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Option 1: They are expensive.
Explanation:Advantage of copper or nickel wire is that, they are inexpensive.
Que.6 Consider the following statements.
(i) Thin film RTDs are relatively small and inexpensive.
(ii) Platinum used in RTD has small temperature range.
- Both statements are wrong.
- Both statements are correct.
- Statement (i) is wrong.
- Statement (ii) is wrong.
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Option 4: Statement (ii) is wrong.
Que.7 RTD and Thermistors are _____ transducers.
- active and analog
- passive and analog
- active and digital
- passive and digital
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Option 2: passive and analog
Que.8 Consider following statements about thermistors.
(i) They have limited resistance range only upto few ohm.
(ii) Available in a wide range of sizes, shapes and also as probes of various dimensions and shapes.
Only statement (i) is correct.
Only statement (ii) is correct.
Both statements are correct.
Both statements are wrong.
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Option 2: Only statement (ii) is correct.
Explanation: Some parameters of Thermistors areTemperature range: -250 degree C to 700 degree C
Resistances: typically 100W (higher available)
Sizes: from a few mm to a few cm
Compatibility: glass, ceramic encapsulation
Available in ready made probes
Que.9Temperature coefficient of thermistor is _______.
- zero
- positive or negative
- negative
- positive
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Option 2: positive or negative
Explanation:The thermistor can be made by using metal, alloys or semiconductors. Therefore, they may have PTC or NTC.Que.10 Thermistors are very _____ for narrow range applications and slightly _____ for wide temperature ranges
- linear, nonlinear
- nonlinear, linear
- unstable, linear
- nonlinear, unstable
✔ View Answer
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