Electronics and Communication Engineering - Electronic Devices and Circuits

6. 

Which of the following is not a semiconductor?

A. Silicon
B. Calcium arsenide
C. Germanium
D. Zinc sulphide

Answer: Option B

Explanation:

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7. 

At absolute temperature

A. the forbidden energy gap in germanium is higher than that in silicon
B. the forbidden energy gap in germanium and silicon are equal
C. the forbidden energy gap in silicon is higher than that in germanium
D. none of the above

Answer: Option C

Explanation:

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8. 

If E is electric field intensity, the current density due to field emission is proportional to

A. E
B. E2
C. E2.5
D. E3/2

Answer: Option B

Explanation:

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9. 

When a high voltage reference is required it is advantageous to use two or more zener diodes in series to allow

A. higher voltage
B. higher dissipation
C. lower temperature coefficient
D. all of the above

Answer: Option D

Explanation:

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10. 

Assertion (A): When p-n junction is forward biased, steady current flows.

Reason (R): When a p-n junction is forward biased, free electrons cross the junction from n to p and holes from p to n.

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: Option A

Explanation:

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