This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on ” Resistive Transducers”.
1. Resistive transducers are ______________
a) Primary transducers
b) Secondary transducers
c) Either primary or secondary
d) None of the mentioned
View Answer
Explanation: Resistive transducers may be primary or secondary transducers according to application.
2. What will happen to resistance, if the length of the conductor is increased?
a) Decreases
b) No change
c) Increases
d) Doubles
View Answer
Explanation: As length of conductor increases, resistance increases according to expression R = (ϱl)/A.
3. Which of the following can be measured using change in resistivity?
a) Temperature
b) Visible radiation
c) Moisture content
d) All of the mentioned
View Answer
Explanation: Change in resistivity can be brought in the measurement of all the mentioned quantities, as resistivity is sensitive to temperature.
4. What will happen for resistivity metal and semiconductor if the temperature is increased?
a) Increases
b) Decreases
c) For metal increases and for semiconductor decreases
d) For metal decreases and for semiconductor increases
View Answer
Explanation: Metal has a positive temperature coefficient of resistance and semiconductor has a negative temperature coefficient of resistance.
5. What is the relation of temperature coefficient of resistivity on the coefficient of thermal expansion in RTD?
a) Higher
b) Lower
c) Equal
d) None of the mentioned
View Answer
Explanation: It is used to provide a considerable change in resistance when exposed to temperature.
6. A metal with temperature coefficient of resistance has a value 200, its initial resistance is given by 40Ω. For an increase in 300c to350c what will be the final resistance value?
a) 40 KΩ
b) 4 KΩ
c) 40 Ω
d) 400 Ω
View Answer
Explanation: Answer obtained using expression RT=R0(1+αΔT), where α represents temperature coefficient of resistance, R0 and RT represents initial and final resistance values.
7. Which of the following can be used to measure using thermistors?
a) Very low
b) In-between 100Ω and 1MΩ
c) Greater than 1MΩ
d) None of the mentioned
View Answer
Explanation: Thermistor at 200c can be used to measure resistance values between 100Ω and 1MΩ.
8. Thermistors may be in wire form.
a) True
b) False
View Answer
Explanation: Due to high brittleness thermistors cannot be formed into wire type. Hence they are shaped into bead form.
9. Which of the following is correct for thermistors?
a) Positive temperature coefficient of resistance
b) Negative temperature coefficient of resistance
c) Unpredictable temperature coefficient
d) None of the mentioned
View Answer
Explanation: For thermistors as temperature increase, resistance decreases.
10. Thermistors have high stability.
a) True
b) False
View Answer
Explanation: Stability of thermistors are not satisfactory. They can be improved by using high temperature.
Sanfoundry Global Education & Learning Series – Instrumentation Transducers.
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