Measurement and Instrumentation Trivia Quizzes for Practice

61. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

1. almost zero
2. low
3. high
4. none of the above

62. The scale of a rectifier instrument is

1. linear
2. non-linear
3. either a or b
4. neither a nor b

63. The spring material used in a spring control device should have the following property.

1. Should be non-magnetic
2. Most be of low temperature co-efficient
3. Should have low specific resistance
4. All of the above

64. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a

1. single-phase winding
2. two-phase winding
3. three-phase winding
4. any of the above

65. The switch board instruments

1. should be mounted in vertical position
2. should be mounted in horizontal position
3. either a or b
4. neither a nor b

66. The two pressure coils of a single phase power factor meter have

1. the same dimensions and the same number of turns
2. the same dimension but different number of turns
3. the same number of turns but different dimensions
4. none of the above

67. The use of...............instruments is merely confined within laboratories as stand¬ardizing instruments

1. absolute
2. indicating
3. recording
4. integrating

68. To avoid the effect of stray magnetic field in A.C. bridges we can use

1. magnetic screening
2. Wagner earthing device
3. wave filters
4. any of the above

69. To measure a resistance with the help of a potentiometer it is

1. necessary to standardise the potentiometer
2. not necessary to standardise the potentiometer
3. necessary to use a volt ratio box in conjunction with the potentiometer
4. none of the above

70. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supplyfor the potentiometer in taken

1. from a source which is not the same as the unknown voltage
2. from a battery
3. from the same source as the unknown voltage

71. To measure radio frequency, the suitable frequency meter is

1. Weston frequency meter
2. reed vibrator frequency meter
3. hetrodyne frequency meter
4. electrical resonance frequency meter

72. Two holes in the disc of energymeter are drilled at the opposite sides of the spindle to

1. improve its ventilation
2. eliminate creeping at no load
3. increase its deflecting torque
4. increase its braking tcrque

73. Various adjustments in an energy meter include

1. light load or friction
2. lag and creep
3. overload and voltage compensation
4. temperature compensation

74. Volt box is a component to

1. extend voltage range
2. measure voltage
3. compare voltage in a box
4. none of the above

75. Wagner earthing device is used to eliminate errors due to

1. electrostatic coupling
2. electromagnetic coupling
3. both a and b
4. none of the above