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.
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
a) maximum loading
b) minimum loading
c) zero loading
d) infinite loading
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 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.
6. How many passive transducers are there?
Explanation: There are three passive transducers. They are as follows:
7. Resistance of a metallic conductor is given by
a) R = I⁄A
b) R = ρ⁄A
c) R = ρl⁄A
d) R = 1⁄A
Explanation: The resistance of a metallic conductor is given by the relation
R = ρl⁄A
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.
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
b) self inductance
c) mutual inductance
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.
Sanfoundry Global Education & Learning Series – Electrical Measurements.
To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers.