Basically a potentiometer is a device for________________?

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 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°

3. 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

4. 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

5. 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

6. 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

7. The spring material used in a spring control device should have the following property?

   A. Should be non-magnetic
   B. Most be of low temperature co-efficient
   C. Should have low specific resistance
   D. Should not be subjected to fatigue
   E. All of the above

8. A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?

   A. deflecting
   B. controlling
   C. damping
   D. any of the above

9. 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

10. Wagner earthing device is used to eliminate errors due to________________?

    A. electrostatic coupling
    B. electromagnetic coupling
    C. both A. and B.
    D. none of the above