Semiconductor Devices Test

Result

Semiconductor Devices Test - 93

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Weekly Quiz Competition

Question 1
4 / -1

A transistor is operated in common-emitter configuration at V_c = 2V such that a change in the base current from 100 μA to 200 μA produces a change in the collector current from 5 mA to 10 mA. The current gain is

A
75

B
100

C
150

D
50

Solution
Question 2
4 / -1

A
12

B
24

C
6

D
5

Solution
Question 3
4 / -1

In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2mA. The base current is

A
0.4 mA

B
0.2 mA

C
0.29 mA

D
0.35 mA

Solution
Question 4
4 / -1

In a common emitter transistor, the current gain is 80. What is the change in collector current, when the change in base current is 250 μA

A
80 × 250 μA

B
(250 – 80)μA

C
(250 + 80)μA

D
250/80μA

Solution
Question 5
4 / -1

The transistors provide good power amplification when they are used in

A
Common collector configuration

B
Common emitter configuration

C
Common base configuration

D
None of the above
Question 6
4 / -1

For a transistor the parameter β = 99. The value of the parameter α is

A
0.9

B
0.99

C
1

D
9

Solution
Question 7
4 / -1

For transistor action
I. Base, emitter and collector regions should have similar size and doping concentrations
II. The base region must be be very thin and lightly doped
III. The emitter-base junction is forward biased and base-collector junction is reverse biased
IV. Both the emitter-base junction as well as the base collector junction are forward biased
Which one of the following pairs of statements is correct

A
IV, I

B
I, II

C
II, III

D
III, IV
Question 8
4 / -1

The most commonly used material for making transistor is

A
Copper

B
Silicon

C
Ebonite

D
Silver
Question 9
4 / -1

An NPN-transistor circuit is arranged as shown in figure. It is

A
A common base amplifier circuit

B
A common emitter amplifier circuit

C
A common collector amplifier circuit

D
Neither of the above
Question 10
4 / -1

The part of a transistor which is heavily doped to produce a large number of majority carriers, is

A
Base

B
Emitter

C
Collector

D
None of these