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
Related Mcqs:
- In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be_____________?
A. out of phase by 90°
B. out of phase by 60°
C. out of phase by 30°
D. out of phase by 0°
E. out of phase by 180° - To measure a resistance with the help of a potentiometer it is_________________?
A. necessary to standardise the potentiometer
B. not necessary to standardise the potentiometer
C. necessary to use a volt ratio box in conjunction with the potentiometer
D. none of the above - A potentiometer may be used for_________________?
A. measurement of resistance
B. measurement of current
C. calibration of ammeter
D. calibration of voltmeter
E. all of the above - In order to achieve high accuracy, the slide wire of a potentiometer should be_______________?
A. as long as possible
B. as short as possible
C. neither too small not too large
D. very thick - Basically a potentiometer is a device for________________?
A. comparing two voltages
B. measuring a current
C. comparing two currents
D. measuring a voltage
E. none 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 - The desirable static characteristics of a measuring system are______________?
A. accuracy and reproducibility
B. accuracy, sensitivity and reproducibility
C. drift and dead zone
D. static error - __________ instruments are those which measure the total quantity of electricity delivered in a particular time ?
A. Absolute
B. Indicating
C. Recording
D. Integrating - Induction type single phase energy meters measure electric energy in_______________?
A. kW
B. Wh
C. kWh
D. VAR
E. None of the above - It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________?
A. D.C. voltmeter
B. Ammeter and a known resistance
C. D.C. potentiometer
D. None of the above
