In a Schering bridge the potential of the detector above earth potential is______________?
(A) a few volts only
(B) 1 kV
(C) 5 kV
(D) 10 kV
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is_________________?
(A) 10°
(B) 80°
(C) 120°
(D) 170°
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
For measurements on high voltage capacitors, the suitable bridge is_______________?
(A) Wein bridge
(B) Modified De Santy’s bridge
(C) Schering bridge
(D) Any of the above
(D) None of the above
In an Anderson bridge, the unknown inductance is measured in terms of_______________?
(A) known inductance and resistance
(B) known capacitance and resistance
(C) known resistance
(D) known inductance
Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to_____________?
(A) improve its ventilation
(B) eliminate creeping at no load
(C) increase its deflecting torque
(D) increase its braking torque