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SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generators

Multiple Choice Question (MCQ) of Electronics page-7

91. How many thyratron tubs will be used to have directional rotation of d.c. motor when speed of the motor is being controlled?

a) One
b) Two
c) Three
d) Four

Ans: (b)

92. Which of the following statement is true?

a) When the speed of the d.c. motor is controlled by using thyratron, the plate voltage determines the armature current and the motor speed.
b) When the speed of the d.c. motor is controlled by using thyratron, the grid voltage determines the armature current and the motor speed.
c) When the speed of the d.c. motor is controlled by using thyratron, the type of gas used in the tube will determine the armature current and the motor speed.
d) When the speed of the d.c. motor is controlled by using thyratron, the size of the thyratron will determine the armature current and the motor speed.

Ans: (b)

93. An operational amplifier should have

a) Zero output impedance
b) Low output impedance
c) High output impedance
d) Infinity impedance

Ans: (b)

94. The operational amplifiers are seldom used for differentiation because

a) The problem of drift exists with the differentiating circuits
b) The noise pulses are amplified and this can be significant in the output
c) The problem of drift does not exist in the differentiating network
d) The differentiating circuits are not economic

Ans: (b)

95. The problems of drift exists in the differentiating network when the operational amplifier is used in the circuit

a) True
b) False

Ans: (b)

96. When it is necessary to sum signals at any amplifier input operational feedback is used and with operational feedback

a) The signal potentials are being added
b) The signal current are being added
c) Either (a) or (b)
d) (a) and (b) simultaneously

Ans: (b)

97. A operational amplifier cannot be used as voltage or current amplifier

a) True
b) False

Ans: (b)

98. Enumerate the three major sources of error in the integrator circuit where an operational amplifier has been used to fabricate the integrator

a) Zero-level offset
b) Current leakage of the summing point
c) Capacity leakage

Ans: ()

99. If the gain of the chopper amplifier is 1000 and the operational amplifier gain is 50,000, the d.c. gain of the chopper stabilized operational amplifier will be

a) 50,000
b) 50 × 106
c) 1000
d) 50

Ans: (b)

100. The chopper amplifier detects offset by measuring the potential at the summing point of the operational amplifier.

a) True
b) False

Ans: (a)

101. In some cases the operational amplifier can be used as a precision waveform generator

a) True
b) False

Ans: (a)

102. The term “fly back” is associated with

a) CRT
b) Transistor
c) Operational amplifier
d) Rectifier
e) Electronic tube

Ans: (a)

103. Which of the following waveform is referred as “sweep”

a) Square waveform
b) Sinusoidal waveform
c) Triangular waveform
d) Sawtooth waveform

Ans: (d)

104. The silicon Zener diode has a theoretical switching time of about

a) 1 × 10-6 seconds
b) 1 × 10-8 seconds
c) 8 × 10-6 seconds
d) 1 × 10-12 seconds

Ans: (a)

105. The diode-resistor circuit can be used as a limiter by connecting the load

a) In series with the diode only
b) In shunt with the diode only
c) (a) or (b)
d) None of the above

Ans: (c)

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