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WorksheetsTransistor amplifier
Total questions: 25
Worksheet time: 25mins
How the negative feedback is called?
Regenerative feedback
Degenerative feedback
Current controlled feedback
Voltage controlled feedback
Why NPN type of transistors are preferred over the PNP typ transistors?
NPN has lower switching speed
NPN has good bias stability
NPN has higher switching speed
Low operating voltage
What type of packaging is generally used to transistors utilized for low power amplification?
Metal packaging
Plastic Packaging
Ceramic packaging
with metal heat sink
Which type of amplifier in used to operate the loud speaker?
IF amplifier
RF amplifier
Power amplifier
Voltage amplifier
What is the voltage gain in a transistor if the input voltage in 40 mv and the output voltage in 3.6 V?
45
90
180
270
What is the input impedence of darlington pair transistors?
Very low input impedence
Very high input impedence
Medium input impedence
Uniter
Which type of amplifier has the frequency response curve as ?
RC coupled amplifier
LC coupled amplifier
Direct coupled amplifier
Transformer coupled amplifier
What is the frequency of operation of the amplifier circuit using inductance and capacitance coupling?
Video signals
High frequency signals
Audio frequency signals
Intermediate frequency signals
What is the purpose of using positive feedback in amplifiers?
To produce modulation
To produce demodulation
To produce oscillation
To produce multiplexion
How can you confirm that a transistors as defective?
By circuit testing
By ohm meter testing
By physical testing
By voltage measurements
Where does the depletion region exists in a bipolar transistors?
Between emitter base electrodes
Between collector base electrodes
Between collector and emitter electrodes
Between E B and B C electrodes
What is status of the transistor in the circuit?
Acting as an amplifier
Acting as an oscillator
Acting as an open switch
Acting as closed switch
What is the phase difference between input and output voltages when it is connected in common emitter configuration?
0
90
180
270
For proper amplification of transistors the Q point should be located at the .....
Middle of DC load line
End of DC load line
Begining of DC load line
None of these
The most stable biasing method used in linear transistors is
Fixed biase
Emitter biase
Base biase
Voltage divider biase
Good Frequency is obtained from which coupling method?
RC coupling method
LC coupling method
Direct coupling method
Transformer coupling method
What is the voltage gain of tuned amplifier at resonant frequency ?
Minimum
Maximum
0
Infinity
What is the collector efficiency of class B amplifier
78.5%
25%
50%
80%
Which biasing method is used in digital IC
Voltage divider
Base Biase
Emitter biase
None of these
In a RC Coupled amplifier the coupler device is
Resistor and capacitor
Capcitor
Direct
Transformer coupled
What is the maximum emitter to base voltage of BC147
5V
4V
6v
10V
Which is the highly doped terminal?
Emitter
Collector
Base
Emitter base
Positive feedback is used to
Increase the gain
Decrease the gain
Minimum
Zero
Darlington amplifier is a
Common collector
Common Emitter
Common base
Emitter
The output of the first stage is fed to the second via
Coupling network
Amplifier
Emitter
Collector
