1. Which of the following are integrating instruments ?
(A) Ammeters
(B) Voltmeters
(C) Wattmeters
(D) Ampere-hour and watt-hour meters
Ans: D
(A) Ammeters
(B) Voltmeters
(C) Wattmeters
(D) Ampere-hour and watt-hour meters
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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(A) deflecting
(B) controlling
(C) damping
(D) any of the above
Ans: C
(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
(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
(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
(A) measurement of resistance
(B) measurement of current
(C) calibration of ammeter
(D) calibration of voltmeter
(E) all of the above
Ans: E