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MCQ
BASIC ELECTRONICS
CONTROL SYSTEM ENGINEERING
DIGITAL ELECTRONICS
ELECTRICAL CIRCUIT ANALYSIS
ELECTRICAL ENERGY CONSERVATION AND AUDITING
ELECTRICAL ENGINEERING MATERIALS
ELECTRICAL MACHINES
ELECTRICAL VEHICLES
ELECTRICAL WIRING
ELECTROMAGNETICS
MEASUREMENT & INSTRUMENTATION
MICROPROCESSOR AND MICROCONTROLLER INTERFACING
POWER ELECTRONICS & DRIVES
POWER SYSTEM
SIGNALS & SYSTEMS
UTILIZATION OF ELECTRICAL ENERGY
BASIC ELECTRONICS
Q21.
In a JFET, drain current is primarily controlled by,
Gate reverse bias
Channel resistance
Size of depletion region
Voltage drop across the channel
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Solution
Q22.
Magnetic amplifiers are used for
voltage amplification
power amplification
current amplification
frequency amplification
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Solution
Q23.
In push pull amplifier there occurs cancellation
of even order harmonics
of all order harmonics
of all odd order harmonics
none of the above
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Solution
Q24.
The maximum efficiency of class B amplifier
50%
78.5%
35%
100%
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Solution
Q25.
Class AB amplifier is often used in power(large signal) amplifiers in order to
get maximum efficiency
remove even harmonics
overcome a cross-over distortion
reduce collector dissipation
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Solution
Q26.
The lower critical frequency of a direct-coupled amplifier with no bypass capacitor is
Variable
0 Hz
Depend on the bias
None of these
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Solution
Q27.
Which of the following is not a characteristic of an ideal Op amp?
The open loop voltage gain is negatively infinite
The open loop voltage gain is zero
The input impedance is infinitely large
The output impedance is zero
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Solution
Q28.
The ideal Op amp has the following characteristics.
\(R_i = \infty, A = \infty, R_o = 0\)
\(R_i = 0, A = \infty, R_o = 0\)
\(R_i = \infty, A = \infty, R_o = \infty\)
\(R_i = 0, A = \infty, R_o = \infty\)
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Solution
Q29.
Current cannot flow to the ground through
A mechanical ground
An ac ground
A virtual ground
An a ordinary ground
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Solution
Q30.
In the operational transconductance amplifier, the transconductance is controlled by
The ac supply voltage
A bias current
The input signal voltage
The manufacturing process
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Solution
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