In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be_____________?

Related Mcqs:

1. 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

2. 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°

3. 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

4. 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

5. 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

6. 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

7. 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

8. For handling greater currents induction wattmeters are used in conjunction with______________?

   A. potential transformers
   B. current transformers
   C. power transformers
   D. either of the above
   E. none of the above

9. 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

10. 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