

McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
1. |
The use of _____ instruments is merely confined within laboratories as stand¬ardizing instruments. |
A. | absolute |
B. | indicating |
C. | recording |
D. | integrating |
Answer» A. absolute |
2. |
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 |
Answer» B. Indicating instruments |
3. |
_____ instruments are those which measure the total quantity of electricity delivered in a particular time. |
A. | Absolute |
B. | Indicating |
C. | Recording |
D. | Integrating |
Answer» D. Integrating |
4. |
Which of the following are integrating instruments ? |
A. | Ammeters |
B. | Voltmeters |
C. | Wattmeters |
D. | Ampere-hour and watt-hour meters |
Answer» D. Ampere-hour and watt-hour meters |
5. |
Resistances can be measured with the help of |
A. | wattmeters |
B. | voltmeters |
C. | ammeters |
D. | ohmmeters and resistance bridges |
Answer» D. ohmmeters and resistance bridges |
6. |
According to application, instruments are classified as |
A. | switch board |
B. | portable |
C. | both (a) and (b) |
D. | moving coil |
Answer» C. both (a) and (b) |
7. |
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 |
Answer» D. 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 |
Answer» C. damping |
9. |
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 |
Answer» D. All of the above |
10. |
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. | All of the above |
Answer» D. All of the above |
11. |
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 |
Answer» A. ammeter |
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 |
Answer» C. by eliminating the control springs |
13. |
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 |
Answer» D. All of the above |
14. |
An induction meter can handle current upto |
A. | 10 A |
B. | 30 A |
C. | 60 A |
D. | 100 A |
Answer» D. 100 A |
15. |
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 |
Answer» B. current transformers |
16. |
Induction type single phase energy meters measure electric energy in |
A. | kW |
B. | Wh |
C. | kWh |
D. | VAR |
Answer» C. kWh |
17. |
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 |
Answer» C. induction type single phase energy meters |
18. |
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 |
Answer» C. Induction meters |
19. |
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 |
Answer» D. All of the above |
20. |
A potentiometer may be used for |
A. | measurement of resistance |
B. | measurement of current |
C. | calibration of ammeter |
D. | all of the above |
Answer» D. all of the above |
21. |
is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another, |
A. | Tangent galvanometer |
B. | Meggar |
C. | Current transformer |
D. | None of the above |
Answer» B. Meggar |
22. |
The household energy meter is |
A. | an indicating instrument |
B. | a recording instrument |
C. | an integrating instrument |
D. | none of the above |
Answer» C. an integrating instrument |
23. |
The pointer of an indicating instrument should be |
A. | very light |
B. | very heavy |
C. | either (a) or (b) |
D. | neither (a) nor (b) |
Answer» A. very light |
24. |
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 |
Answer» A. D.C. ammeter hour meter |
25. |
In majority of instruments damping is provided by |
A. | fluid friction |
B. | spring |
C. | eddy currents |
D. | all of the above |
Answer» C. eddy currents |
26. |
An ammeter is a |
A. | secondary instrument |
B. | absolute instrument |
C. | recording instrument |
D. | integrating instrument |
Answer» A. secondary instrument |
27. |
In a portable instrument, the controlling torque is provided by |
A. | spring |
B. | gravity |
C. | eddy currents |
D. | all of the above |
Answer» A. spring |
28. |
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 |
Answer» C. conducting and non-magnetic material |
29. |
The switch board instruments |
A. | should be mounted in vertical position |
B. | should be mounted in horizontal position |
C. | either (a) or (b) |
D. | neither (a) nor (b) |
Answer» A. should be mounted in vertical position |
30. |
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 |
Answer» A. by pass the current |
31. |
The multiplier and the meter coil in a voltmeter are in |
A. | series |
B. | parallel |
C. | series-parallel |
D. | none of the above |
Answer» A. series |
32. |
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 |
Answer» C. both D.C. and A.C. |
33. |
The scale of a rectifier instrument is |
A. | linear |
B. | non-linear |
C. | either (a) or (b) |
D. | neither (a) nor (b) |
Answer» A. linear |
34. |
For measuring current at high frequency we should use |
A. | moving iron instrument |
B. | electrostatic instrument |
C. | thermocouple instrument |
D. | none of the above |
Answer» C. thermocouple instrument |
35. |
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 |
Answer» C. high |
36. |
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 |
Answer» A. both D.C. and A.C. |
37. |
An induction 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 |
Answer» B. D.C. only |
38. |
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 |
Answer» A. load impedance is high |
39. |
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 |
Answer» B. to the load side of the current coil |
40. |
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 |
Answer» C. in series with pressure coil |
41. |
In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was |
A. | unity |
B. | 0.8 lagging |
C. | 0.8 leading |
D. | zero |
Answer» A. unity |
42. |
In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be |
A. | unity |
B. | 0.5 |
C. | 0.3 |
D. | zero |
Answer» B. 0.5 |
43. |
The adjustment of position of shading bands, in an energy meter is done to provide |
A. | friction compensation |
B. | creep compensation |
C. | braking torque |
D. | none of the above |
Answer» A. friction compensation |
44. |
An ohmmeter is a |
A. | moving iron instrument |
B. | moving coil instrument |
C. | dynamometer instrument |
D. | none of the above |
Answer» B. moving coil instrument |
45. |
When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is |
A. | short-circuited |
B. | all right |
C. | faulty |
D. | none |
Answer» B. all right |
46. |
For measuring a very high resistance we should use |
A. | Kelvin's double bridge |
B. | Wheat stone bridge |
C. | Meggar |
D. | None of the above |
Answer» C. Meggar |
47. |
The electrical power to a meggar is provided by |
A. | battery |
B. | permanent magnet D.C. generator |
C. | AC. generator |
D. | any of the above |
Answer» B. permanent magnet D.C. generator |
48. |
In a meggar controlling torque is provided by |
A. | spring |
B. | gravity |
C. | coil |
D. | eddy current |
Answer» C. coil |
49. |
The operating voltage of a meggar is about |
A. | 6 V |
B. | 12 V |
C. | 40 V |
D. | 100 V |
Answer» D. 100 V |
50. |
Murray loop test can be used for location of |
A. | ground fault on a cable |
B. | short circuit fault on a cable |
C. | both the ground fault and the short-circuit fault |
D. | none of the above |
Answer» C. both the ground fault and the short-circuit fault |
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