A. magnetic screening
B. Wagner earthing device
C. wave filters
D. any of the above
Related Mcqs:
- 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 - For measuring current at high frequency we should use_______________?
A. moving iron instrument
B. electrostatic instrument
C. thermocouple instrument
D. none of the above - 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° - The chemical effect of current is used in ______________?
A. D.C. ammeter hour meter
B. D.C. ammeter
C. D.C. energy meter
D. none of the above - The use of _________ instruments is merely confined within laboratories as standardizing instruments?
A. absolute
B. indicating
C. recording
D. integrating
E. none of the above - In a portable instrument, the controlling torque is provided by_____________?
A. spring
B. gravity
C. eddy currents
D. all of the above - A direct current can be measured by________________?
A. a D.C. potentiometer directly
B. a D.C. potentiometer in conjunction with a standard resistance
C. a D.C. potentiometer in conjunction with a volt ratio box
D. none of the above - A phase shifting transformer is used in conjunction with_______________?
A. D.C. potentiometer
B. Drysdale potentiometer
C. A.C. co-ordinate potentiometer
D. Crompton potentiometer - 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 - To measure radio frequency, the suitable frequency meter is_______________?
A. Weston frequency meter
B. reed vibrator frequency meter
C. heterodoxy frequency meter
D. electrical resonance frequency meter
