For measuring a very high resistance we should use_______________?
(A) Kelvin’s double bridge
(B) Wheat stone bridge
(C) Meggar
(D) None of the above
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
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
Basically a potentiometer is a device for________________?
(A) comparing two voltages
(B) measuring a current
(C) comparing two currents
(D) measuring a voltage
(D) none of the above
In a meggar controlling torque is provided by______________?
(A) spring
(B) gravity
(C) coil
(D) eddy current
In a low power factor wattmeter the pressure coil is connected_______________?
(A) to the supply side of the current coil
(B) to the load side of the current coil
(C) in any of the two meters at connection
(D) none of the above
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be_____________?
(A) almost zero
(B) low
(C) high
(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°