Measurement and Instrumentation - Interview Questions | Exam2Win

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26. It is required to measure the true open circuit e.m.f. of a battery. The best device is

A. D.C. voltmeter

B. Ammeter and a known resistance

C. D.C. potentiometer

D. None of the above

Explanation:

27. The operating voltage of a meggar is about

A. 6 V

B. 12 V

C. 40 V

D. 100 V

Explanation:

28. In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be

A. unity

B. 0.5

C. 0.3

D. zero

Explanation:

29. In a low power factor wattmeter the compensating coil is connected

A. in series with current coil

B. in parallel with current coil

C. in series with pressure coil

D. in parallel with pressure coil

Explanation:

30. For measuring current at high frequency we should use

A. moving iron instrument

B. electrostatic instrument

C. thermocouple instrument

D. none of the above

Explanation: