The two pressure coils of a single phase power factor meter have_________________?

A. The same dimensions and the same number of turns
B. The same dimension but different number of turns
C. The same number of turns but different dimensions
D. None of the above

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of_________________?

A. 0.1 hz
B. 0.25 hz
C. 0.5 hz
D. 1.5 hz

The power factor of a single phase load can be calculated if the instruments available are_____________?

A. One voltmeter and one ammeter
B. One voltmeter, one ammeter and one wattmeter
C. One voltmeter, one ammeter and one energy meter
D. Any of the above

A Weston synchronoscope is a________________?

A. Moving coil instrument
B. Moving iron instrument
C. Dynamometer instrument
D. None of the above

In a Weston synchronoscope, the fixed coils are connected across_______________?

A. Bus-bars
B. Incoming alternator
C. A lamp
D. None of the above

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at_____________?

A. 0°
B. 60°
C. 90°
D. 120°

In a Weston frequency meter, the magnetic axes of the two fixed coils are__________________?

A. Parallel
B. Perpendicular
C. Inclined at 60°
D. Inclined at 120°

In a single phase power factor meter the phase difference between the currents in the two pressure coils is___________________?

A. Exactly 0°
B. Approximately 0°
C. Exactly 90°
D. Approximately 90°

A power factor meter has________________?

A. One current circuit and two pressure circuits
B. One current circuit and one pressure circuit
C. Two current circuits and one pres¬sure circuit
D. None 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