Electrical Measuring Instruments Multiple Choice Questions And Answers -01 (English)

1. Which of the following are integrating instruments ?
(A) Ammeters
(B) Voltmeters
(C) Wattmeters
(D) Ampere-hour and watt-hour meters
Ans: D

2. An induction meter can handle current up to
(A) 10 A
(B) 30 A
(C) 60 A
(D) 100 A
Ans: D

3. 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
Ans: B

4. A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
(A) ammeter
(B) voltmeter
(C) flux-meter
(D) ballistic galvanometer
Ans: A

5. _____ instruments are those which measure the total quantity of electricity delivered in a particular time.
(A) Absolute
(B) Indicating
(C) Recording
(D) Integrating
Ans: D

6. Which of the following devices may be used for extending the range of instruments ?
(A) Shunts
(B) Multipliers
(C) Current transformers
(D) All of the above
Ans: D

7. According to application, instruments are classified as
(A) switch board
(B) portable
(C) both (A) and (B)
(D) moving coil
Ans: C

8. The use of _____ instruments is merely confined within laboratories as standardizing instruments.
(A) absolute
(B) indicating
(C) recording
(D) integrating
Ans: A

9. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
(A) Absolute instruments
(B) Indicating instruments
(C) Recording instruments
(D) Integrating instruments
Ans: B

10. 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) All of the above
Ans: D

11. Which of the following properties a damping oil must possess ?
(A) Must be a good insulator
(B) Should be non-evaporating
(C) Should not have corrosive action upon the metal of the vane
(D) The viscosity of the oil should not change with the temperature
(E) All of the above
Ans: E

12. A moving-coil permanent-magnet instrument can be used as flux-meter
(A) by using a low resistance shunt
(B) by using a high series resistance
(C) by eliminating the control springs
(D) by making control springs of large moment of inertia
Ans: C

13. Which of the following meters are not used on D.C. circuits
(A) Mercury motor meters
(B) Commutator motor meters
(C) Induction meters
(D) None of the above
Ans: C

14. Which of the following is an essential part of a motor meter ?
(A) An operating torque system
(B) A braking device
(C) Revolution registering device
(D) All of the above
Ans: D

15. Which of the following essential features is possessed by an indicating instrument ?
(A) Deflecting device
(B) Controlling device
(C) Damping device
(D) All of the above
Ans: D

16. 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
Ans: C

17. Resistances can be measured with the help of
(A) wattmeters
(B) voltmeters
(C) ammeters
(D) ohmmeters and resistance bridges
Ans: D

18. Induction type single phase energy meters measure electric energy in
(A) kW
(B) Wh
(C) kWh
(D) VAR
Ans: C

19. Most common form of A.C. meters met with in every day domestic and industrial installations are
(A) mercury motor meters
(B) commutator motor meters
(C) induction type single phase energy meters
(D) all of the above
Ans: C

20. 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
Ans: E