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Free download in PDF Single Stage Transistor Amplifier Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of ………..
[A]
RC + RL
[B]
RC || RL
[C]
RL
[D]
RC
(2)
In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ………….
[A]
Short
[B]
Open
[C]
Partially open
[D]
None of the above
(3)
In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is ………..
[A]
180 degree
[B]
90 degree
[C]
0 degree
[D]
270 degree
(4)
If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is ……..
[A]
RL + RC
[B]
RC || RL
[C]
RL – RC
[D]
RC
(5)
If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is ………
[A]
165
[B]
165 x 104
[C]
100
[D]
None of the above
(6)
In practice, the voltage gain of an amplifier is expressed ……………..
[A]
As volts
[B]
As a number
[C]
In db
[D]
None of the above
(7)
In a CE amplifier, voltage gain = ……………. x RAC/Rin
[A]
α
[B]
(1 + α)
[C]
(1+ β)
[D]
β
(8)
In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered ……………..
[A]
Short
[B]
Open
[C]
Partially short
[D]
None of the above
(9)
The purpose of capacitors in a transistor amplifier is to ………………
[A]
Protect the transistor
[B]
Cool the transistor
[C]
Couple or bypass a.c. component
[D]
Provide biasing
Answer: Couple or bypass a.c. component
(10)
When a transistor amplifier is operating, the current in any branch is ……………
[A]
Sum of a.c. and d.c.
[B]
a.c. only
[C]
d.c. only
[D]
difference of a.c. and d.c.
Answer: Sum of a.c. and d.c.
(11)
If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ………..
[A]
20 kΩ
[B]
2 kΩ
[C]
10 kΩ
[D]
5 kΩ
(12)
The slope of a.c. load line is ……………… that of d.c. load line
[A]
The same as
[B]
More than
[C]
Less than
[D]
None of the above
(13)
The point of intersection of d.c. and a.c. load lines is called ……………..
[A]
Saturation point
[B]
Cut off point
[C]
Operating point
[D]
None of the above
(14)
The input capacitor in an amplifier is the ……………….. capacitor
[A]
Coupling
[B]
Bypass
[C]
Leakage
[D]
None of the above
(15)
If the collector supply is 10V, then collector cut off voltage under d.c. conditions is ………….
[A]
20 V
[B]
5 V
[C]
2 V
[D]
10 V
(16)
When an a.c. signal is applied to an amplifier, ,the operating point moves along …………….
[A]
d.c. load line
[B]
a.c. load line
[C]
both d.c. and a.c. load lines
[D]
none of the above
(17)
It is generally desired that a transistor should have …………….. input impedance
[A]
Low
[B]
Very low
[C]
High
[D]
Very high
(18)
The phase difference between the output and input voltages of a CE amplifier is ………………..
[A]
180o
[B]
0o
[C]
90o
[D]
270o
(19)
A single stage transistor amplifier contains ……………. and associated circuitry
[A]
Two transistors
[B]
One transistor
[C]
Three transistor
[D]
None of the above
(20)
CC configuration is used for impedance matching because its ……………..
[A]
Input impedance is very high
[B]
Input impedance is low
[C]
Output impedance is very low
[D]
None of the above
Answer: Input impedance is very high
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