Electronics and Communication Engineering - Electronic Devices and Circuits

16. 

When a diode is forward biased, the diode current is

A. high
B. low
C. zero
D. low or zero

Answer: Option A

Explanation:

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17. 

In p type semiconductors the conduction due to holes ( = σp ) is (where e = charge on hole, μp is hole mobility and p is hole concentration)

A.
B.
C. peμp
D.

Answer: Option C

Explanation:

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18. 

At room temperature, the current in the, intrinsic semiconductor is due to

A. holes
B. electrons
C. ions
D. holes and electrons

Answer: Option D

Explanation:

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19. 

Which of these is also called 'hot carrier diode'?

A. PIN diode
B. LED
C. Photo diode
D. Schottky diode

Answer: Option D

Explanation:

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20. 

A d.c. power supply has an open circuit voltage of 100 V. When the full load current is drawn, the output drops to 80 V. The percentage voltage regulation is

A. 97.25%
B. 75%
C. 50%
D. 25%

Answer: Option D

Explanation:

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