Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

The emitter follower is widely used in electronic instrument because
A:
its voltage gain is less than unity
B:
its voltage gain is very high
C:
its O/P Impedance is low and input impedance is high
D:
its O/P Impedance is high and I/P impedance is low
Answer: C
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The number of protons in a silicon atom is
A:
32
B:
28
C:
14
D:
4
Answer: C
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Assertion (A): Silicon is less sensitive to changes in temperature than germanium.

Reason (R): It is more difficult to produce minority carriers in silicon than in germanium.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not a correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: A
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For a photo conductor with equal electron and hole mobilities and perfect ohmic contacts at the ends, an increase in the intensities of optical illumination results in
A:
change in open circuit voltage
B:
change in short circuit current
C:
a reduction resistance
D:
an increase of resistance
Answer: C
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A power supply has full-load voltage of 20 V. What will be its no load voltage when its voltage regulation is 100%
A:
0 V
B:
10 V
C:
20 V
D:
40 V
Answer: D
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