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.

In which region of a CE bipolar transistor is collector current almost constant?

Saturation region

Active region

Breakdown region

Both saturation and active region

View answer & explanation

Correct answer is B

It is used as amplifier when it operates in this region.

The word enhancement mode is associated with

tunnel diode

MOSFET

JFET

photo diode

View answer & explanation

Correct answer is B

MOSFET may be depletion mode or enhancement mode.

Work function of oxide coated cathode is much lower than that of tungsten cathode.

True

False

Cannot say

None of the above

View answer & explanation

Correct answer is A

Therefore emission current from oxide coated cathode is more.

A periodic voltage has following value for equal time intervals changing suddenly from one value to next... 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. Then rms value of the waveform is

31 V

32 V

insufficient data

none of these

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

10.

Calculate the stability factor and change in I_C from 25°C to 100°C for, β = 50, R_B/ R_E = 250, ΔI_C0 = 19.9 nA for emitter bias configuration.

42.53, 0.85 μA

40.91, 0.58 μA

40.58, 0.91 μA

41.10, 0.39 μA

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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