Semiconductor Devices Test

Result

Semiconductor Devices Test - 94

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Weekly Quiz Competition

Question 1
4 / -1

For a transistor, the current amplification factor is 0.8. The transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA is

A
6 mA

B
4.8 mA

C
24 mA

D
8 mA

Solution
Question 2
4 / -1

In a common base amplifier circuit, calculate the change in base current if that in the emitter current is 2 mA and α = 0.98

A
0.04 mA

B
1.96 mA

C
0.98 mA

D
2 mA

Solution
Question 3
4 / -1

In case of NPN–transistors the collector current is always less than the emitter current because

A
Collector side is reverse biased and emitter side is forward biased

B
After electrons are lost in the base and only remaining ones reach the collector

C
Collector side is forward biased and emitter side is reverse biased

D
Collector being reverse biased attracts less electrons

Solution
Question 4
4 / -1

In a transistor circuit shown here the base current is 35 μA. The value of the resistor R_b is

A
123.5 k Ω

B
257 k Ω

C
380.05 k Ω

D
None of these

Solution
Question 5
4 / -1

Which of these is unipolar transistor?

A
Point contact transistor

B
Field effect transistor

C
PNP transistor

D
None of the above
Question 6
4 / -1

For a transistor, in a common emitter arrangement, the alternating current gain β is given by

A

B

C

D
Question 7
4 / -1

A n–p–n transistor having A.0 current gain of 50 is to be used to make an amplifier of power gain of 300. What will be the voltage gain of the amplifier?

A
8.5

B
6

C
4

D
3

Solution
Question 8
4 / -1

In the CB mode of a transistor, when the collector voltage is changed by 0.5 volt. The collector current changes by 0.05 mA. The output resistance will be

A
10 k Ω

B
20 kΩ

C
5 kΩ

D
2.5 kΩ

Solution
Question 9
4 / -1

While a collector to emitter voltage is constant in a transistor, the collector current changes by 8.2 mA when the emitter current changes by 8.3 mA. The value offorward current ratio h_fe is

A
82

B
83

C
8.2

D
8.3

Solution
Question 10
4 / -1

Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current

A
1.1 mA

B
1.01 mA

C
0.01 mA

D
10 mA

Solution