measurement and instrumentation Mcqs
51. The operating voltage of a meggar is about_______________?
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A. 100 V

B. 12 V

C. 6 V

D. 40 V

52. It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________?
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A. D.C. voltmeter

B. None of the above

C. Ammeter and a known resistance

D. D.C. potentiometer
53. In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was___________?
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A. unity

B. zero

C. 0.8 leading

D. 0.8 lagging

54. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
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A. Integrating instruments

B. Indicating instruments

C. Absolute instruments

D. Recording instruments

55. In a low power factor wattmeter the pressure coil is connected_______________?
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A. to the supply side of the current coil

B. to the load side of the current coil

C. none of the above

D. in any of the two meters at connection

56. To measure radio frequency, the suitable frequency meter is_______________?
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A. electrical resonance frequency meter

B. Weston frequency meter

C. reed vibrator frequency meter

D. heterodoxy frequency meter
57. If the current in a capacitor leads the voltage by 80, the loss angle of the capacitor is_________________?
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A. 10

B. 80

C. 120

D. 170

58. For measurements on high voltage capacitors, the suitable bridge is_______________?
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A. None of the above

B. Any of the above

C. Modified De Santys bridge

D. Schering bridge

E. Wein bridge

59. Murray loop test can be used for location of________________?
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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

60. Most sensitive galvanometer is_____________?
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A. vibration galvanometer

B. Duddlb galvanometer

C. elastic galvanometer

D. spot ballistic galvanometer
61. A Weston frequency meter is_____________?
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A. moving iron instrument

B. dynamometer instrument

C. moving coil instrument

D. none of the above

62. In an Anderson bridge, the unknown inductance is measured in terms of_______________?
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A. known capacitance and resistance

B. known inductance and resistance

C. known resistance

D. known inductance

63. An instrument transformer is used to extend the range of______________?
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A. electrostatic instrument

B. induction instrument

C. moving coil instrument

D. any of the above

64. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be_____________?
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A. high

B. almost zero

C. low

D. none of the above

65. The principle on which vector voltmeter is based is_____________?
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A. that it measures the amplitude of a single at two points and at the same time measures their phase difference

B. that it measures the response of linear ramp voltage

C. same as digital meter

D. that it works on the principle of complex variation

66. The scale of a rectifier instrument is_________________?
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A. neither A. nor B.

B. either A. or B.

C. non-linear

D. linear
67. 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_______________?
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A. zero

B. 0.3

C. 0.5

D. unity

68. The disc of an instrument using eddy current damping should be of________________?
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A. non-conducting and magnetic material

B. none of the above

C. conducting and non-magnetic material

D. conducting and magnetic material

69. In a Weston synchronoscope, the fixed coils are connected across_______________?
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A. none of the above

B. incoming alternator

C. a lamp

D. bus-bars

70. Which of the following essential features is possessed by an indicating instrument ?
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A. Deflecting device

B. All of the above

C. Damping device

D. Controlling device

71. An induction wattmeter can be used for_________________?
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A. both D.C. and A.C.

B. D.C. only

C. A.C. only

D. any of the above

72. For measurement of mutual inductance we can use________________?
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A. Heaviside bridge

B. Any of the above

C. Anderson bridge

D. Maxwells bridge

73. An ohmmeter is a____________?
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A. moving coil instrument

B. dynamometer instrument

C. none of the above

D. moving iron instrument

74. In a Weston frequency meter, the magnetic axes of the two fixed coils are__________________?
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A. inclined at 60

B. perpendicular

C. parallel

D. inclined at 120

75. The power of a n-phase circuit can be measured by using a minimum of_______________?
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A. (n + 1) wattmeter elements

B. (n 1) wattmeter elements

C. n wattmeter elements

D. 2n wattmeter elements

76. A direct current can be measured by________________?
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A. a D.C. potentiometer directly

B. none of the above

C. a D.C. potentiometer in conjunction with a volt ratio box

D. a D.C. potentiometer in conjunction with a standard resistance
77. The household energy meter is_______________?
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A. an indicating instrument

B. an integrating instrument

C. none of the above

D. a recording instrument

78. An ammeter is a______________?
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A. recording instrument

B. integrating instrument

C. secondary instrument

D. absolute instrument

79. Most common form of A.C. meters met with in every day domestic and industrial installations are______________?
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A. induction type single phase energy meters

B. mercury motor meters

C. all of the above

D. commutator motor meters

80. Various adjustments in an energy meter include_______________?
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A. temperature compensation

B. overload and voltage compensation

C. light load or friction

D. lag and creep

E. all of the above
81. Which of the following essential features is possessed by an indicating instrument?
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A. All of the above

B. Controlling device

C. Deflecting device

D. Damping device

82. E.m.f. of a Weston cell is accurately measured by________________?
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A. electrostatic voltmeter

B. isothermal voltmeter

C. hot wire voltmeter

D. electrodynamic voltmeter

83. Standard resistor is made from_________________?
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A. nichrome

B. maganin

C. silver

D. platinum

84. For measurement of inductance having high value, we should use______________?
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A. Maxwells bridge

B. Any of the above

C. Maxwell Wein bridge

D. Hays bridge
85. Which of the following meters are not used on D.C. circuits______________?
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A. Commutator motor meters

B. Mercury motor meters

C. Induction meters

D. None of the above

86. In order to achieve high accuracy, the slide wire of a potentiometer should be_______________?
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A. neither too small not too large

B. very thick

C. as long as possible

D. as short as possible

87. Volt box is a component to_____________?
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A. none of the above

B. compare voltage in a box

C. extend voltage range

D. measure voltage

88. Which of the following is measured by using a vector voltmeter ?
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A. All of the above

B. Amplifier gain and phase shift

C. Complex insersion loss

D. Filler transfer functions

89. In a single phase power factor meter the phase difference between the currents in the two pressure coils is___________________?
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A. approximately 0

B. exactly 90

C. exactly 0

D. approximately 90

90. 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____________?
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A. faulty

B. all right

C. short-circuited

91. The spring material used in a spring control device should have the following property?
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A. Most be of low temperature co-efficient

B. Should not be subjected to fatigue

C. All of the above

D. Should be non-magnetic

E. Should have low specific resistance

92. Which of the following are integrating instruments ?
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A. Voltmeters

B. Ammeters

C. Wattmeters

D. Ampere-hour and watt-hour meters
93. Alternating current is measured by_______________?
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A. permanent magnet type ammeter

B. moving iron repulsion type voltmeter

C. electrostatic ammeter

D. induction ammeter
94. Wagner earthing device is used to eliminate errors due to________________?
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A. electrostatic coupling

B. electromagnetic coupling

C. both A. and B.

D. none of the above

95. The gravity controlled instrument has crowded scale because current is proportional to________________?
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A. sine of deflection angle

B. deflection angle

C. balancing weight

96. In a Schering bridge the potential of the detector above earth potential is______________?
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A. a few volts only

B. 5 kV

C. 10 kV

D. 1 kV

97. A voltage of about 200 V can be measured__________________?
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A. a D.C. potentiometer in conjunction with a volt ratio box

B. directly by a D.C. potentiometer

C. a D.C. potentiometer in conjunction with a known resistance

D. none of the above

98. For measuring a very high resistance we should use_______________?
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A. Wheat stone bridge

B. Meggar

C. Kelvins double bridge

D. None of the above

99. The switch board instruments________________?
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A. either A. or B.

B. should be mounted in vertical position

C. neither A. nor B.

D. should be mounted in horizontal position

100. A potentiometer may be used for_________________?
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A. measurement of resistance

B. measurement of current

C. calibration of voltmeter

D. calibration of ammeter

E. all of the above