Important Measuring Instruments Multiple Choice Questions and Answers
21. Which of the following instruments may be used to measure D.C. voltage accurately
A.Moving iron type instrument
B.Moving coil type instrument
C.Electrodynamic type instrument
D.None of the above
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B.Moving coil type instrument
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22. Deflection of a hot wire instrument is proportional to
A.Maximum value of alternating current
B.Instantaneous value of alternating current
C.r.m.s. value of alternating current
D.Average value of alternating current
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23. Following type of instrument is used to measure very small currents of high frequency
A.Induction type instrument
B.Dynamometer type instrument
C.Permanent magnet moving coil type ammeter
D.Thermocouple type instrument
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24. Damping in an instrument provides
A.Counter torque to deflection torque
B.Good accuracy
C.Braking action on a meter pointer
D.Starting torque on the meter pointer
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25. When the damping of an instrument is adjusted to enable the pointer to rise quickly to its deflected position without overshooting, in that case the instrument is said to be
A.Under-damped
B.Over-damped
C.Dead beat
D.Off beat
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