WorksheetsADCtest
Total questions: 20
Worksheet time: 19mins
doping level of Emitter in a transistor
lightly doped
moderately doped
heavily doped
none of the above
Identify the transistor configuration
Common base npn transistor
common emitter pnp transistor
common collector npn transistor
common emitter npn transistor
The phase difference between the signal voltage and output voltage in a common emitter amplifier is
0 deg
90 deg
270 deg
180 deg
In an RC coupled amplifier, coupling device is
Resistor
capacitor
inductor
transformer
the range of frequency over which the voltage gain is equal to greater than 70.7%of maximum gain is known as
Bandwidth
Resonant frequency
Cut-off frequency
None of these
Which of the following is usually employed for voltage amplification
RC coupled amplifier
transformer coupled amplifier
direct coupled amplifier
Class B amplifier
Frequency distortion is observed in which amplifier?
Direct coupled amplifier
transformer coupled amplifier
RC coupled amplifier
none of the above
Direct coupling is used for
high frequency amplification
very low frequency amplification
power amplification
medium frequency amplification
How many stages are there in the amplifier shown in figure?
one
two
three
none of these
Which power amplifier have least distortion?
Class A
Class B
Class AB
In class B power amplifier
collector current flows only during the positive half cycle of the input signal
collector current flows only during the negative half cycle of the input signal
collector current flows during full cycle of the input signal
none of these
Two identical transformers are used back to back in push pull arrangement
true
false
positive feedback is used in .......
amplifiers
oscillators
rectifiers
clippers
positive feedback
increases gain of the amplifier
decreases gain of amplifier
increases distortion
reduces noise
Which feedback provides stability of gain
positive feedback
negative feedback
Gain of negative voltage feedback amplifier is given by
(1+Avmv)Av
(1−Avmv)Av
(1+Avmv)1
(1−Avmv)1
In LC oscillators, frequency of oscillation is determined by
transistor parameters
Values of L and C
value of L
value of C
In RC phase shift oscillator, each section of RC network introduces a phase shift of
60 deg
90 deg
180 deg
0 deg
Identify the type of oscillator circuit
Tuned collector
Colpitt's oscillator
Hartley oscillator
RC oscillator
In Colpitt's oscillator, tank circuit is made up of
one inductor and two capacitors
one capacitor and two inductors
one capacitor and one inductor
resistance and capacitor
