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)
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)
a) Zero output impedance
b) Low output impedance
c) High output impedance
d) Infinity impedance
Ans: (b)
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)
a) True
b) False
Ans: (b)
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)
a) True
b) False
Ans: (b)
a) Zero-level offset
b) Current leakage of the summing point
c) Capacity leakage
Ans: ()
a) 50,000
b) 50 × 106
c) 1000
d) 50
Ans: (b)
a) True
b) False
Ans: (a)
a) True
b) False
Ans: (a)
a) CRT
b) Transistor
c) Operational amplifier
d) Rectifier
e) Electronic tube
Ans: (a)
a) Square waveform
b) Sinusoidal waveform
c) Triangular waveform
d) Sawtooth waveform
Ans: (d)
a) 1 × 10-6 seconds
b) 1 × 10-8 seconds
c) 8 × 10-6 seconds
d) 1 × 10-12 seconds
Ans: (a)
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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