Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________?
A. RC
B. RC || RE
C. RC – RE
D. RC + RE
Answer» E.
Discussion
2.

The value of collector load RC in a transistor amplifier is _______________the output impedance of the transistor?
A. The same as
B. Less than
C. More than
D. None of the above
Answer» C. More than
Discussion
3.

A transistor converts __________________?
A. d.c. power into a.c. power
B. a.c. power into d.c. power
C. high resistance into low resistance
D. none of the above
Answer» B. a.c. power into d.c. power
Discussion
4.

The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?
A. 1000
B. A million
C. 100
D. 10000
Answer» C. 100
Discussion
5.

For highest power gain, one would use _________________configuration?
A. CC
B. CB
C. CE
D. none of the above
Answer» D. none of the above
Discussion
6.

The input capacitor in an amplifier is the______________ capacitor?
A. Coupling
B. Bypass
C. Leakage
D. None of the above
Answer» B. Bypass
Discussion
7.

In transistor amplifiers, we generally use______________ capacitors?
A. Electrolytic
B. Mica
C. Paper
D. Air
Answer» B. Mica
Discussion
8.

The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?
A. Transistor
B. Biasing circuit
C. Collector supply VCC
D. None of the above
Answer» D. None of the above
Discussion
9.

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
Answer» C. RL – RC
Discussion
10.

A transistor amplifier has high output impedance because ______________?
A. Emitter is heavily doped
B. Collector has reverse bias
C. Collector is wider than emitter or base
D. None of the above
Answer» C. Collector is wider than emitter or base
Discussion
11.

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» D. Provide biasing
Discussion
12.

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
Answer» B. Open
Discussion
13.

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
Answer» B. 165 x 104
Discussion
14.

In a CE amplifier, voltage gain =____________________ x RAC/Rin?
A. α
B. (1 + α)
C. (1+ β)
D. β
Answer» E.
Discussion
15.

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
Answer» E.
Discussion
16.

In the zero signal conditions, a transistor sees _____________ load?
A. a.s.
B. d.c.
C. both d.c. and a.c.
D. none of the above
Answer» C. both d.c. and a.c.
Discussion
17.

In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?
A. 180o
B. 270o
C. 90o
D. 0o
Answer» E.
Discussion
18.

The phase difference between the output and input voltages of a CE amplifier is _____________?
A. 180o
B. 0o
C. 90o
D. 270o
Answer» B. 0o
Discussion
19.

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» B. a.c. only
Discussion
20.

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
Answer» E.
Discussion
21.

An amplifier has a power gain of 100. Its db gain is ________________?
A. 10 db
B. 20 db
C. 40 db
D. None of the above
Answer» C. 40 db
Discussion
22.

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
Answer» C. Less than
Discussion
23.

If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________?
A. High
B. Very high
C. Moderate
D. Low
Answer» E.
Discussion
24.

A CE amplifier is also called _______________ circuit?
A. Grounded emitter
B. Grounded base
C. Grounded collector
D. None of the above
Answer» B. Grounded base
Discussion
25.

The purpose of d.c. conditions in a transistor is to___________________?
A. Reverse bias the emitter
B. Forward bias the collector
C. Set up operating point
D. None of the above
Answer» D. None of the above
Discussion
26.

When an a.c. signal is applied to an amplifier, ,the operating point moves along_________________?
A. a.c. load line
B. d.c. load line
C. both d.c. and a.c. load lines
D. none of the above
Answer» B. d.c. load line
Discussion
27.

The ratio of output impedance of a CE amplifier is _______________?
A. About 1
B. Low
C. High
D. Moderate
Answer» E.
Discussion
28.

The purpose of a coupling capacitor in a transistor amplifier is to ___________________?
A. Increase the output impedance of transistor
B. Protect the transistor
C. Pass a.c. and block d.c.
D. Provide biasing
Answer» D. Provide biasing
Discussion
29.

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
Answer» D. None of the above
Discussion
30.

It is generally desired that a transistor should have_____________________ input impedance?
A. Low
B. Very low
C. High
D. Very high
Answer» D. Very high
Discussion
31.

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
Answer» E.
Discussion
32.

In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________?
A. Thin base
B. Thin collector
C. Wide emitter
D. None of the above
Answer» B. Thin collector
Discussion
33.

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
Answer» C. Partially short
Discussion
34.

The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________?
A. Avoid voltage gain drop
B. Forward bias the emitter
C. Reduce noise in the amplifier
D. None of the above
Answer» B. Forward bias the emitter
Discussion
35.

A single stage transistor amplifier contains______________ and associated circuitry?
A. Two transistors
B. One transistor
C. Three transistor
D. None of the above
Answer» C. Three transistor
Discussion
36.

The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?
A. The same as
B. Less than
C. More than
D. None of the above
Answer» D. None of the above
Discussion
37.

If the input capacitor of a transistor amplifier is short-circuited, then_________________?
A. Transistor will be destroyed
B. Biasing conditions will change
C. Signal will not reach the base
D. None of the above
Answer» C. Signal will not reach the base
Discussion
38.

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» B. Input impedance is low
Discussion