Electronics and Communication Engineering questions and answers

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.

2.

The normal operation of JFET is

A.

constant voltage region

B.

constant current region

C.

both constant voltage and constant current regions

D.

either constant voltage or constant current region

Correct answer is B

In major portion of drain characteristics, ID is constant.

3.

The power dissipation in a transistor is the product of

A.

emitter current and emitter to base voltage

B.

emitter current and collector to emitter voltage

C.

collector current and collector to emitter voltage

D.

none of the above

Correct answer is C

Maximum power dissipation occurs at collector junction.

4.

Which of the following is true as regards photo emission?

A.

Velocity of emitted electrons is dependent on light intensity

B.

Rate of photo emission is inversely proportional to light intensity

C.

Maximum velocity of electron increases with decreasing wave length

D.

Both holes and electrons are produced

Correct answer is C

As wavelength decreases, frequency increases and maximum velocity of electron increases.

5.

A p-n junction diode has

A.

low forward and high reverse resistance

B.

a non-linear v-i characteristics

C.

zero forward current till the forward voltage reaches cut in value

D.

all of the above

Correct answer is D

A p-n Junction has all these features.