1. The use of _____ instruments is merely confined within laboratories as stand¬ardizing
instruments.
Correct : 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 ?
Correct : B. Indicating instruments
3. _____ instruments are those which measure the total quantity of electricity delivered in a
particular time.
Correct : D. Integrating
4. Which of the following are integrating instruments ?
Correct : D. Ampere-hour and watt-hour meters
5. Resistances can be measured with the help of
Correct : D. ohmmeters and resistance bridges
6. According to application, instruments are classified as
Correct : C. both (a) and (b)
7. Which of the following essential features is possessed by an indicating instrument ?
Correct : 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
Correct : C. damping
9. The spring material used in a spring control device should have the following property.
Correct : D. All of the above
10. Which of the following properties a damping oil must possess ?
Correct : D. All of the above
11. A moving-coil permanent-magnet instrument can be used as _____ by using a low
resistance shunt.
Correct : A. ammeter
12. A moving-coil permanent-magnet instrument can be used as flux-meter
Correct : C. by eliminating the control springs
13. Which of the following devices may be used for extending the range of instruments ?
Correct : D. All of the above
14. An induction meter can handle current upto
Correct : D. 100 A
15. For handling greater currents induction wattmeters are used in conjunction with
Correct : B. current transformers
16. Induction type single phase energy meters measure electric energy in
Correct : C. kWh
17. Most common form of A.C. meters met with in every day domestic and industrial
installations are
Correct : C. induction type single phase energy meters
18. Which of the following meters are not used on D.C. circuits
Correct : C. Induction meters
19. Which of the following is an essential part of a motor meter ?
Correct : D. All of the above
20. A potentiometer may be used for
Correct : D. all of the above
21. is an instrument which measures the insulation resistance of an electric circuit relative to
earth and one another,
Correct : B. Meggar
22. The household energy meter is
Correct : C. an integrating instrument
23. The pointer of an indicating instrument should be
Correct : A. very light
24. The chemical effect of current is used in
Correct : A. D.C. ammeter hour meter
25. In majority of instruments damping is provided by
Correct : C. eddy currents
26. An ammeter is a
Correct : A. secondary instrument
27. In a portable instrument, the controlling torque is provided by
Correct : A. spring
28. The disc of an instrument using eddy current damping should be of
Correct : C. conducting and non-magnetic material
29. The switch board instruments
Correct : A. should be mounted in vertical position
30. The function of shunt in an ammeter is to
Correct : A. by pass the current
31. The multiplier and the meter coil in a voltmeter are in
Correct : A. series
32. A moving iron instrument can be used for
Correct : C. both D.C. and A.C.
33. The scale of a rectifier instrument is
Correct : A. linear
34. For measuring current at high frequency we should use
Correct : C. thermocouple instrument
35. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
Correct : C. high
36. A dynamometer wattmeter can be used for
Correct : A. both D.C. and A.C.
37. An induction wattmeter can be used for
Correct : B. D.C. only
38. The pressure coil of a wattmeter should be connected on the supply side of the current coil
when
Correct : A. load impedance is high
39. In a low power factor wattmeter the pressure coil is connected
Correct : B. to the load side of the current coil
40. In a low power factor wattmeter the compensating coil is connected
Correct : 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
Correct : 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
Correct : B. 0.5
43. The adjustment of position of shading bands, in an energy meter is done to provide
Correct : A. friction compensation
44. An ohmmeter is a
Correct : 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
Correct : B. all right
46. For measuring a very high resistance we should use
Correct : C. Meggar
47. The electrical power to a meggar is provided by
Correct : B. permanent magnet D.C. generator
48. In a meggar controlling torque is provided by
Correct : C. coil
49. The operating voltage of a meggar is about
Correct : D. 100 V
50. Murray loop test can be used for location of
Correct : C. both the ground fault and the short-circuit fault
51. Which of the following devices should be used for accurate measurement of low D.C.
voltage ?
Correct : B. D.C. potentiometer
52. It is required to measure the true open circuit e.m.f. of a battery. The best device is
Correct : C. D.C. potentiometer
53. A voltage of about 200 V can be measured
Correct : B. a D.C. potentiometer in conjunction with a volt ratio box
54. A direct current can be measured by
Correct : B. a D.C. potentiometer in conjunction with a standard resistance
55. To measure a resistance with the help of a potentiometer it is
Correct : B. not necessary to standardise the potentiometer
56. A phase shifting transformer is used in conjunction with
Correct : B. Drysdale potentiometer
57. Basically a potentiometer is a device for
Correct : A. comparing two voltages
58. In order to achieve high accuracy, the slide wire of a potentiometer should be
Correct : A. as long as possible
59. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply
for the potentiometer in taken
Correct : C. from the same source as the unknown voltage
60. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer
usually has a
Correct : B. two-phase winding
61. In an AC. co-ordinate potentiometer, the currents in the phase and quadrature
potentiometer are adjusted to be
Correct : A. out of phase by 90°
62. A universal RLC bridge uses
Correct : B. Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance
63. For measurements on high voltage capacitors, the suitable bridge is
Correct : C. Schering bridge
64. In an Anderson bridge, the unknown inductance is measured in terms of
Correct : B. known capacitance and resistance
65. Wagner earthing device is used to eliminate errors due to
Correct : A. electrostatic coupling
66. For measurement of mutual inductance we can use
Correct : C. Heaviside bridge
67. For measurement of inductance having high value, we should use
Correct : C. Hay's bridge
68. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is
Correct : A. 10°
69. In a Schering bridge the potential of the detector above earth potential is
Correct : A. a few volts only
70. To avoid the effect of stray magnetic field in A.C. bridges we can use
Correct : A. magnetic screening
71. If an inductance is connected in one arm of bridge and resistances in the remaining three arms
Correct : B. the bridge cannot be balanced
72. A power factor meter has
Correct : A. one current circuit and two pres¬sure circuits
73. The two pressure coils of a single phase power factor meter have
Correct : A. the same dimensions and the same number of turns
74. In a single phase power factor meter the phase difference between the currents in the two
pressure coils is
Correct : C. exactly 90°
75. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at
Correct : D. 120°
76. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a
difference of
Correct : C. 0.5 Hz
77. In a Weston frequency meter, the magnetic axes of the two fixed coils are
Correct : B. perpendicular
78. A Weston frequency meter is
Correct : B. moving iron instrument
79. A Weston synchronoscope is a
Correct : C. dynamometer instrument
80. In a Weston synchronoscope, the fixed coils are connected across
Correct : B. incoming alternator
81. In Weston synchronoscope the moving coil is connected across
Correct : A. bus-bars
82. The power factor of a single phase load can be calculated if the instruments available are
Correct : B. one voltmeter, one ammetqr and one wattmeter
83. The desirable static characteristics of a measuring system are
Correct : B. accuracy, sensitivity and reproducibility
84. The ratio of maximum displacement deviation to full scale deviation of the instrument is
called
Correct : C. linearity
85. Systematic errors are
Correct : D. all of the above
86. Standard resistor is made from
Correct : B. maganin
87. Commonly used standard capacitor is
Correct : B. concentric cylindrical type
88. Operating torques in analogue instruments are
Correct : C. deflecting, control and damping
89. Commonly used instruments in power system measurement are
Correct : A. induction
90. Damping of the Ballistic galvanometer is made small to
Correct : A. get first deflection large
91. If an instrument has cramped scale for larger values, then it follows
Correct : B. logarithmic law
92. Volt box is a component to
Correct : A. extend voltage range
93. E.m.f. of a Weston cell is accurately measured by
Correct : A. electrostatic voltmeter
94. The gravity controlled instrument has crowded scale because current is proportional to
Correct : C. sine of deflection angle
95. A sensitive galvanometer produces large deflection for a
Correct : A. small value of current
96. A multirangq instrument has
Correct : A. multiple shunt or series resistances inside the meter