Creeping in energy meter occurs due to

 Q51. In induction type energy meter, the disc rotates due to

A) Interaction of magnetic fields
B) Electric field
C) Heat
D) Friction
Answer: A

Q52. The phase angle error in induction meter occurs due to
A) Lagging current in voltage coil
B) Lagging current in current coil
C) Eddy currents
D) Both A & B
Answer: D

Q53. The primary standard of resistance is
A) Wire-wound resistor
B) Carbon resistor
C) Potentiometer
D) Metal oxide resistor
Answer: A

Q54. The AC potentiometer differs from DC potentiometer by
A) Use of phase-shifting device
B) Use of AC supply
C) Use of moving coil
D) None
Answer: A

Q55. In a Schering bridge, the unknown is
A) Capacitance and dielectric loss
B) Resistance
C) Inductance
D) Power
Answer: A

Q56. A Wien bridge can measure frequency accurately because
A) Bridge balance is independent of source voltage
B) Very high resistance
C) Low power loss
D) None
Answer: A

Q57. The main advantage of a DSO over analog CRO is
A) Can store and analyze transient waveforms
B) High accuracy
C) Low cost
D) Less maintenance
Answer: A

Q58. The sampling frequency of digital instruments must satisfy
A) Nyquist criterion
B) Half the signal frequency
C) Any value
D) Zero
Answer: A

Q59. The main error in digital voltmeters is due to
A) Quantization
B) Loading
C) Temperature
D) Phase
Answer: A

Q60. A dual-slope ADC is preferred due to
A) Noise rejection
B) High speed
C) Low resolution
D) High cost
Answer: A

Q61. The integrating type ADC is immune to
A) High frequency noise
B) Temperature
C) Supply voltage variation
D) All of the above
Answer: D

Q62. The resolution of a 12-bit ADC is
A) 1/4096 of full scale
B) 1/1024
C) 1/2048
D) 1/8192
Answer: A

Q63. In a digital multimeter, the reference voltage should be
A) Highly stable
B) AC voltage
C) Low current
D) Variable
Answer: A

Q64. The main advantage of PMMC instruments is
A) High accuracy and linear scale
B) Can measure AC directly
C) Low cost
D) Robustness
Answer: A

Q65. The main limitation of MI instruments is
A) Non-linear scale
B) Sensitive to polarity
C) Only AC measurement
D) Cannot measure current
Answer: A

Q66. In moving iron instruments, hysteresis effect occurs due to
A) Magnetic material of core
B) Coil resistance
C) Eddy currents
D) Spring stiffness
Answer: A

Q67. The sensitivity of voltmeter is expressed in
A) Ω/V
B) V/Ω
C) Ampere
D) Volt
Answer: A

Q68. The sensitivity of ammeter is expressed in
A) A/Ω
B) Ω/A
C) Volt
D) Ohm
Answer: B

Q69. A dynamometer type instrument can measure
A) Both AC and DC
B) AC only
C) DC only
D) None
Answer: A

Q70. The main advantage of dynamometer type instrument is
A) Can measure power in AC circuits with any power factor
B) High speed
C) Low cost
D) None
Answer: A

Q71. The maximum current that can safely flow through an ammeter is determined by
A) Full scale deflection current
B) Shunt resistance
C) Coil resistance
D) All of the above
Answer: D

Q72. The term “burden” in CT refers to
A) Load connected across secondary
B) Current rating
C) Voltage rating
D) All of the above
Answer: A

Q73. The accuracy of a CT decreases with
A) Increasing burden
B) Reducing burden
C) Constant burden
D) None
Answer: A

Q74. In a PT, phase angle error is mainly due to
A) Magnetizing current
B) Load current
C) Both
D) None
Answer: A

Q75. The main limitation of PMMC instruments for AC is
A) Cannot measure AC directly
B) Low accuracy
C) Non-linear scale
D) Fragile
Answer: A

Q76. A thermocouple converts
A) Temperature difference to voltage
B) Voltage to current
C) Current to displacement
D) None
Answer: A

Q77. The sensitivity of thermocouple increases with
A) Number of junctions (thermopile)
B) Length of wire
C) Temperature coefficient
D) All of the above
Answer: D

Q78. The RTD works on the principle of
A) Resistance changes with temperature
B) Capacitance
C) Inductance
D) Voltage
Answer: A

Q79. The PT100 sensor has resistance of
A) 100 Ω at 0°C
B) 100 Ω at 25°C
C) 110 Ω at 0°C
D) 200 Ω at 0°C
Answer: A

Q80. LVDT has
A) Infinite input impedance
B) Low input impedance
C) High current
D) Variable resistance
Answer: A

Q81. The output of LVDT is
A) AC voltage
B) DC voltage
C) Current
D) Frequency
Answer: A

Q82. Hall-effect sensor is used to measure
A) Magnetic field
B) Current
C) Voltage
D) Pressure
Answer: A

Q83. Piezoelectric transducer output is proportional to
A) Force or pressure applied
B) Voltage applied
C) Resistance
D) Current
Answer: A

Q84. A strain gauge output depends on
A) Mechanical strain
B) Voltage
C) Current
D) Temperature only
Answer: A

Q85. The gauge factor of strain gauge is typically
A) 2
B) 1
C) 10
D) 0.5
Answer: A

Q86. A frequency counter measures
A) Number of pulses per second
B) Voltage
C) Current
D) Resistance
Answer: A

Q87. The resolution of frequency counter improves with
A) Increasing gate time
B) Reducing input voltage
C) Increasing resistance
D) Decreasing capacitance
Answer: A

Q88. A function generator can produce
A) Sine, square, triangular waves
B) Only sine wave
C) Only square wave
D) Only triangular wave
Answer: A

Q89. The main advantage of digital instruments is
A) High accuracy, low loading, data storage
B) Low cost
C) Low speed
D) Analog display
Answer: A

Q90. The voltmeter loading error is reduced by
A) High input impedance
B) Low resistance
C) Series resistor
D) Parallel resistor
Answer: A

Q91. The peak value of a sine wave is
A) 1.414 × RMS value
B) RMS value
C) Average value
D) None
Answer: A

Q92. The average value of a sine wave is
A) 0.637 × peak value
B) RMS value
C) Peak value
D) 1.414 × RMS
Answer: A

Q93. A digital oscilloscope uses
A) ADC to convert input waveform
B) DAC
C) Both
D) None
Answer: A

Q94. The main source of error in AC measurement by PMMC with rectifier is
A) Harmonics
B) Temperature
C) Humidity
D) Parallax
Answer: A

Q95. Hot-wire instrument measures
A) True RMS value
B) Average value
C) Peak value
D) DC only
Answer: A

Q96. The shunt resistor in ammeter should have
A) Low resistance
B) High resistance
C) Medium resistance
D) Variable resistance
Answer: A

Q97. The multiplier in voltmeter should have
A) High resistance
B) Low resistance
C) Medium resistance
D) Variable resistance
Answer: A

Q98. The energy meter calibration is done using
A) Standard supply and reference meter
B) Multimeter
C) CRO
D) Wattmeter
Answer: A

Q99. Creeping in energy meter occurs due to
A) Friction and residual magnetism
B) Overload
C) Phase error
D) Load variation
Answer: A

Q100. The main advantage of induction type energy meter is
A) Accurate measurement of AC energy
B) Can measure DC
C) Low cost
D) Measures current only
Answer: A