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WorksheetsPower Amplifier
Total questions: 20
Worksheet time: 18mins
The output signal varies for a full 360º of the cycle. It is ________ power amplifiers.
class A
class B
class C
All of the answer
The output signal varies for ________ of the cycle in class B power amplifiers.
between 180º and 360º
180º
less than 180º
all of the answer
A form of class A amplifier having maximum efficiency of ________ uses a transformer to couple the output signal to the load.
50%
25%
78.5%
90%
Input stage of power amplifier is also called ___________
Front end
Beginning stage
Normal stage
All of the answer
The current drawn from a single power supply has the form of ________ rectified signal in class B operation.
both a full-wave and a half-wave
a full-wave
a half-wave
None of the answer
Which of the following is power amplifiers?
Class A
Class B
Class C
All of the answer
Power amplifier directly amplifies ___________
Voltage of signal
Current of the signal
Power of the signal
All of the answer
An amplifier that operates in the linear region at all times is _________________
Class A amplifiers
Class B amplifiers
Class C amplifiers
Class AB amplifiers
In class B amplifier, the maximum efficiency of is ____________.
50%
78.5%
100%
None of the answer
_____________ coupling is generally employed in power amplifiers
Transformer
RC
Direct
Impedance
Transistor in power amplifier is ___________
A passive device
A voltage generating device
An active device
A op-amp
Figure shows an example of the output swing for a class ________ amplifier.
A
B
AB
C
To obtain the output for the full cycle of the signal, how many transistors must be used in a class B power amplifier?
0
1
2
3
Which amplifier is commonly used as a frequency multiplier?
class A
class B
class C
all of the answer
A class B amplifier operates in the linear region for __________.
much less than 180° of the input cycle.
slightly less than 180° of the input cycle.
360° of the input cycle.
all of the answer.
Which of the following describes a power amplifier?
It can handle large power.
It does not provide much voltage gain.
It can handle large current.
All of the answer.
The least efficient amplifier among all classes is ________________.
class A
class B
class AB
class C
The maximum efficiency of a transformer-coupled class A amplifier is ________.
25%
50%
68.5%
78.5%
The class ________ amplifier is biased below cutoff.
A
AB
B
C
Figure shows an example of the output swing for a class ________ amplifier.
A
B
AB
C
