Explore topic-wise MCQs in Electrical Engineering.

This section includes 234 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

201.

There is a need of transformer for ………………..

A. half-wave rectifier
B. centre-tap full-wave rectifier
C. bridge full-wave rectifier
D. none of the above
Answer» C. bridge full-wave rectifier
Discussion
202.

The ripple factor of a half-wave rectifier is ………………

A. 2
B. 1.21
C. 2.5
D. 0.48
Answer» E.
Discussion
203.

The disadvantage of a half-wave rectifier is that the……………….`

A. components are expensive
B. diodes must have a higher power rating
C. output is difficult to filter
D. none of the above
Answer» D. none of the above
Discussion
204.

Mains a.c. power is converrted into d.c. power for ……………

A. lighting purposes
B. heaters
C. using in electronic equipment
D. none of the above
Answer» D. none of the above
Discussion
205.

………. rectifier has the lowest forward resistance

A. solid state
B. vacuum tube
C. gas tube
D. none of the above
Answer» B. vacuum tube
Discussion
206.

A zener diode has ………….. breakdown voltage

A. undefined
B. sharp
C. Zero
D. none of the above
Answer» C. Zero
Discussion
207.

A zener diode is …………………. device

A. a non-linear
B. a linear
C. an amplifying
D. none of the above
Answer» B. a linear
Discussion
208.

A series resistance is connected in the zener circuit to………..

A. properly reverse bias the zener
B. protect the zener
C. properly forward bias the zener
D. none of the above
Answer» C. properly forward bias the zener
Discussion
209.

In the breakdown region, a zener didoe behaves like a …………… source.

A. constant voltage
B. constant current
C. constant resistance
D. none of the above
Answer» B. constant current
Discussion
210.

A zener diode utilizes ……….. characteristics for its operation.

A. forward
B. reverse
C. both forward and reverse
D. none of the above
Answer» C. both forward and reverse
Discussion
211.

A zener diode is always ………… connected.

A. reverse
B. forward
C. either reverse or forward
D. none of the above
Answer» B. forward
Discussion
212.

The doping level in a zener diode is …………… that of a crystal diode

A. the same as
B. less than
C. more than
D. none of the above
Answer» D. none of the above
Discussion
213.

A zener diode is used as …………….

A. an amplifier
B. a voltage regulator
C. a rectifier
D. a multivibrator
Answer» C. a rectifier
Discussion
214.

A zener diode has ………..

A. one pn junction
B. two pn junctions
C. three pn junctions
D. none of the above
Answer» B. two pn junctions
Discussion
215.

If the doping level in a crystal diode is increased, the width of depletion layer………..

A. remains the same
B. is decreased
C. in increased
D. none of the above
Answer» D. none of the above
Discussion
216.

When a crystal diode is used as a rectifier, the most important consideration is ……….

A. forward characteristic
B. doping level
C. reverse characteristic
D. PIC rating
Answer» E.
Discussion
217.

A crystal diode utilises …………….. characteristic for rectification

A. reverse
B. forward
C. forward or reverse
D. none of the above
Answer» C. forward or reverse
Discussion
218.

A crystal diode is a …………… device

A. non-linear
B. bilateral
C. linear
D. none of the above
Answer» B. bilateral
Discussion
219.

When the crystal current diode current is large, the bias is …………

A. forward
B. inverse
C. poor
D. reverse
Answer» B. inverse
Discussion
220.

When the graph between current through and voltage across a device is a straight line, the device is referred to as ……………….

A. linear
B. active
C. nonlinear
D. passive
Answer» B. active
Discussion
221.

The knee voltage of a crystal diode is approximately equal to ………….

A. applied voltage
B. breakdown voltage
C. forward voltage
D. barrier potential
Answer» E.
Discussion
222.

If the doping level of a crystal diode is increased, the breakdown voltage………….

A. remains the same
B. is increased
C. is decreased
D. none of the above
Answer» D. none of the above
Discussion
223.

The PIV rating of a crystal diode is ………….. that of equivalent vacuum diode

A. the same as
B. lower than
C. more than
D. none of the above
Answer» C. more than
Discussion
224.

If the temperature of a crystal diode increases, then leakage current ……..

A. remains the same
B. decreases
C. increases
D. becomes zero
Answer» D. becomes zero
Discussion
225.

The leakage current in a crystal diode is due to …………….

A. minority carriers
B. majority carriers
C. junction capacitance
D. none of the above
Answer» B. majority carriers
Discussion
226.

The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ………….

A. 1 : 1
B. 100 : 1
C. 1000 : 1
D. 40,000 : 1
Answer» E.
Discussion
227.

An ideal crystal diode is one which behaves as a perfect ………..when forward biased.

A. conductor
B. insulator
C. resistance material
D. none of the above
Answer» B. insulator
Discussion
228.

The d.c. resistance of a crystal diode is ………….. its a.c. resistance

A. the same as
B. more than
C. less than
D. none of the above
Answer» D. none of the above
Discussion
229.

A crystal diode is used as ……………

A. an amplifier
B. a rectifier
C. an oscillator
D. a voltage regulator
Answer» C. an oscillator
Discussion
230.

The forward voltage drop across a silicon diode is about …………………

A. 2.5 V
B. 3 V
C. 10 V
D. 0.7 V
Answer» E.
Discussion
231.

The reverse current in a diode is of the order of ……………….

A. kA
B. mA
C. μA
D. A
Answer» D. A
Discussion
232.

If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is ………….. biased.

A. forward
B. reverse
C. either forward or reverse
D. none of the above
Answer» B. reverse
Discussion
233.

A crystal diode has forward resistance of the order of ……………

A. kΩ
B. Ω
C. MΩ
D. none of the above
Answer» C. MΩ
Discussion
234.

A crystal diode has ………

A. one pn junction
B. two pn junctions
C. three pn junctions
D. none of the above
Answer» B. two pn junctions
Discussion