# Electrical Measurements Questions and Answers – Transducer Selection Factors

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Transducer Selection Factors”.

1. Selection of a transducer depends on the quantity being measured.
a) True
b) False

Explanation: A transducer is selected based on the nature of the quantity that is being measured. For example temperature measurement involves the use of temperature sensors whereas measurement of stress involves a strain gauge.

2. A transducer must have _____________

Explanation: A transducer in general should have a minimum amount of load. Minimum loading effect ensures that the transducer has minimal errors in the measurement of any quantity.

3. Transducers must operate under ___________
a) zero electromagnetic field
b) constant electromagnetic fields
c) varying electromagnetic fields
d) infinite electromagnetic field

Explanation: A transducer should operate under strong electromagnetic fields. Generally transducers with a low value of output impedance, high value of output voltage and shorter cable length are not susceptible to such interference.

4. Errors can be minimised in some transducers through ___________
a) power compensation
b) voltage compensation
c) resistance compensation
d) temperature compensation

Explanation: In some transducers errors occurring due to temperature changes can be minimized by providing temperature compensation. Operation and maintenance of transducers beyond 300°F is extremely difficult.

5. How can a transducer be used in the environment with vibrations?
a) using shock absorbers
b) using proper grounding
c) using effective voltage
d) using a transformer

Explanation: Transducers can be used effectively in an environment subjected to shock and vibrations by making use of dampers.
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6. How many passive transducers are there?
a) 1
b) 3
c) 5
d) 7

Explanation: There are three passive transducers. They are as follows:
Resistor
Capacitor
Inductor.

7. Resistance of a metallic conductor is given by ___________
a) R = IA
b) R = ρA
c) R = ρlA
d) R = 1A

Explanation: The resistance of a metallic conductor is given by the relation
R = ρlA
where, R is the resistance
l is the length
A is the area of cross-section
ρ is the resistivity of material of the conductor.

8. Passive transducers are described with their primary parameters.
a) True
b) False

Explanation: The passive transducers such as resistor, capacitor and inductor are described through the means of their primary parameters namely resistance, capacitance and self inductance.

9. Rotational potentiometers use ___________
a) capacitance
b) self inductance
c) mutual inductance
d) resistance

Explanation: Rotational potentiometers or translational potentiometers make use of the change in resistance as a result of the change in length of a conductor.

10. Temperature transducers make use of ___________
a) change in resistivity
b) change in length
c) change in area
d) change in capacitance

Explanation: The change in resistivity of the material of a conductor is used to measure the variation in temperature. Temperature is affected due to change in the resistance which in turn varies the resistivity.

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