# MCQ on Measuring Instruments – 1

1. Which of the following meter is an integrating type instrument?
(A) Ammeter.
(B) Voltmeter.
(C) Wattmeter.
(D) Energy metre.

2. Creeping in energy metre implies
(A) slow rotation of rotor with only voltage coil excited.
(B) slow rotation of rotor with only current coil excited.
(C) fast rotation of rotor with only voltage coil excited.
(D) fast rotation of rotor with only current coil excited.

3. Moving iron instruments have
(A) uniform scale.
(B) squared scale.
(C) log scale.
(D) linear scale.

4. To avoid the cripping error in the energy metres, the discs must
(A) be laminated.
(B) be thin.
(C) have bar magnet.
(D) have holes.

5. For the measurement of 50 kV direct current, we can use the
(A) hot wire voltmeter.
(B) electrodynamometer.
(C) electrostatic voltmeter.
(D) thermocouple voltmeter.

6. Permanent magnet moving coil instruments can be used for the measurement of
(A) AC only.
(B) DC only.
(C) both AC and DC.
(D) none of the above.

7. Which of the following instrument is Free from hysterisis and Eddy current error?
(A) PMMC instrument.
(B) dynamometer type instrument.
(C) electrostatic instrument.
(D) moving iron instrument.

8. The gravity controlled instrument has crowded scale because current is proportional to
(A) gravitational force.
(B) balancing weight.
(C) deflection angle.
(D) sine of deflection angle.

9. Electrostatic instruments are mainly employed to measure
(A) heavy currents.
(B) low currents.
(C) low voltages.
(D) high voltages.

10. The instruments which measure the total quantity of electricity delivered in a particular time are called
(A) absolute instruments.
(B) indicating instruments.
(C) recording instruments.
(D) integrating instruments.

11. Permanent magnet moving coil instruments are used for measuring
(A) DC only.
(B) AC only.
(C) both AC and DC.
(D) none of the above.

12. By increasing the number of experimenters we can reduce the
(A) absolute errors.
(B) gross errors.
(C) random errors.
(D) fractional errors.

13. The most suitable instrument for measuring current at high frequency is
(A) moving coil instrument.
(B) moving iron instrument.
(C) electrostatic instrument.
(D) thermocouple instrument.

14. For measurement of mutual inductance we can use
(A) Hay’s bridge.
(B) Anderson bridge.
(C) Maxwell’s bridge.
(D) Heaviside bridge.

15. In a moving coil instrument, the damping torque is developed by
(A) fluid friction damping.
(B) air friction damping.
(C) eddy current damping.
(D) gravity friction damping.

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