Electronics and Communication Engineering Questions and Answers

Prepare for your Electronics and Communication Engineering exams/aptitude tests, assess your knowledge of electronics and communication equipment with these ECE questions and answers.

11.

Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at 20°C and 32 nA at 50°C.

Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10°C rise in temperature.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

View answer & explanation

Correct answer is A

At 20°C, 4 nA, at 30°C, 8 nA, at 40°C, 16 nA, at 50°C, 32 nA.

12.

A potential of 7 V is applied to a silicon diode. A resistance of 1 K ohm is also in series with the diode. The current is

7 mA

6.3 mA

0.7 mA

View answer & explanation

Correct answer is B

I = (7 - 0.7)/1000

13.

The types of carriers in a semiconductor are

View answer & explanation

Correct answer is B

Holes and electrons.

14.

In a degenerate n type semiconductor material, the Fermi level

is in valence band

is in conduction band

is at the centre in between valence and conduction bands

is very near valence band

View answer & explanation

Correct answer is B

This is due to high level of doping.

15.

Secondary emission is always decremental.

True

False

Cannot say

It depends

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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Electronics and Communication Engineering Questions and Answers

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