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.Management Sciences
Category: Measurement and Instrumentation
A Weston frequency meter is_____________?
A. moving coil instrument
B. moving iron instrument
C. dynamometer instrument
D. none of the above
Commonly used instruments in power system measurement are_______________?
A. induction
B. moving coil or iron
C. rectifier
D. electrostatic
Various adjustments in an energy meter include_______________?
A. light load or friction
B. lag and creep
C. overload and voltage compensation
D. temperature compensation
E. all of the above
To avoid the effect of stray magnetic field in A.C. bridges we can use_______________?
A. magnetic screening
B. Wagner earthing device
C. wave filters
D. any of the above
The principle on which vector voltmeter is based is_____________?
A. that it works on the principle of complex variation
B. that it measures the response of linear ramp voltage
C. same as digital meter
D. that it measures the amplitude of a single at two points and at the same time measures their phase difference
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
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?
A. from a source which is not the same as the unknown voltage
B. from a battery
C. from the same source as the unknown voltage
D. any of the above
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a _________________?
A. single-phase winding
B. two-phase winding
C. three-phase winding
D. any of the above
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