Measurement and Instrumentation

81. The principle on which vector voltmeter is based is

  1. that it works on the principle of complex variation
  2. that it measures the response of linear ramp voltage
  3. same as digital meter
  4. that it measures the amplitude of a single at two points and at the same time measures their phase difference

Correct answer: (D)
that it measures the amplitude of a single at two points and at the same time measures their phase difference

82. The ratio of maximum displacement deviation to full scale deviation of the instrument is called

  1. static sensitivity
  2. dynamic deviation
  3. linearity
  4. precision or accuracy

Correct answer: (C)
linearity

83. The rectifier instrument is not free from

  1. temperature error
  2. wave shape error
  3. frequency error
  4. all of the above

Correct answer: (C)
frequency error

84. 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

Correct answer: (C)
high

85. The scale of a rectifier instrument is

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

Correct answer: (A)
linear

86. 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. Should not be subjected to fatigue
  5. All of the above

Correct answer: (E)
All of the above

87. 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

Correct answer: (B)
two-phase winding

88. 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)

Correct answer: (A)
should be mounted in vertical position

89. 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

Correct answer: (A)
the same dimensions and the same number of turns

90. The use of _________ instruments is merely confined within laboratories as standardizing instruments.

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

Correct answer: (A)
absolute

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