Electrical Measuring Instruments Multiple Choice Questions And Answers -02 (English)

1. is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,
(A) Tangent galvanometer
(B) Megger
(C) Current transformer
(D) None of the above
Ans: B

2. 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
Ans: C

3. In a low power factor wattmeter the compensating coil is connected
(A) in series with current coil
(B) in parallel with current coil
(C) in series with pressure coil
(D) in parallel with pressure coil
Ans: C

4. The household energy meter is
(A) an indicating instrument
(B) a recording instrument
(C) an integrating instrument
(D) none of the above
Ans: C

5. In a low power factor wattmeter the pressure coil is connected
(A) to the supply side of the current coil
(B) to the load side of the current coil
(C) in any of the two meters at connection
(D) none of the above
Ans: B

6. The pointer of an indicating instrument should be
(A) very light
(B) very heavy
(C) either (A) or (B)
(D) neither (A) nor (B)
Ans: A

7. The pressure coil of a wattmeter should be connected on the supply side of the current coil when
(A) load impedance is high
(B) load impedance is low
(C) supply voltage is low
(D) none of the above
Ans: A

8. 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
Ans: A

9. In majority of instruments damping is provided by
(A) fluid friction
(B) spring
(C) eddy currents
(D) all of the above
Ans: C

10. An ammeter is a
(A) secondary instrument
(B) absolute instrument
(C) recording instrument
(D) integrating instrument
Ans: A

11. In a portable instrument, the controlling torque is provided by
(A) spring
(B) gravity
(C) eddy currents
(D) all of the above
Ans: A

12. The disc of an instrument using eddy current damping should be of
(A) conducting and magnetic material
(B) non-conducting and magnetic material
(C) conducting and non-magnetic material
(D) none of the above
Ans: C

13. An induction wattmeter can be used for
(A) both D.C. and A.C.
(6) D.C. only
(C) A.C. only
(D) any of the above
Ans: B

14. The switch board instruments
(A) should be mounted in vertical position
(6) should be mounted in horizontal position
(C) either (A) or (B)
(D) neither (A) nor (B)
Ans: A

15. The function of shunt in an ammeter is to
(A) by pass the current
(B) increase the sensitivity of the ammeter
(C) increase the resistance of ammeter
(D) none of the above
Ans: A

16. The multiplier and the meter coil in a voltmeter are in
(A) series
(B) parallel
(C) series-parallel
(D) none of the above
Ans: A

17. A moving iron instrument can be used for
(A) D.C. only
(B) A.C. only
(C) both D.C. and A.C.

(D) none of the above
Ans: C

18. The scale of a rectifier instrument is
(A) linear
(B) non-linear
(C) either (A) or (B)
(D) neither (A) nor (B)
Ans: A

19. A dynamometer wattmeter can be used for
(A) both D.C. and A.C.
(B) D.C. only
(C) A.C. only
(D) any of the above
Ans: A

20. For measuring current at high frequency we should use
(A) moving iron instrument
(B) electrostatic instrument
(C) thermocouple instrument
(D) none of the above
Ans: C