The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply of frequency of

Electronics and Communication Engineering (ECE) : Electronic Devices and Circuits - Quiz(MCQ)

5 kHz

15 kHz

20 kHz

30 kHz

Correct Answer : Option (A) : 5 kHz

Explanation : For inverter grade SCR, typical turn off time (t_off) is 5 to 50 μsec while 50 to 100 μsec for converter grade SCR.

Hence supply frequency of 5 kHz will turn off the SCR by voltage reversal because 1/5KHz = 200 μsec.

Recently Updated in Electronic Devices and Circuits Questions

The kinetic energy of photoelectrons emitted by a photo sensitive surface depends on

angle of incidence of radiation

surface conditions of the surface

intensity of the incident radiation

wavelength of the incident radiation

Correct Answer : wavelength of the incident radiation

For radiating ultraviolet rays, LEDs use

gallium arsenide

zinc sulphide

gallium phosphide

None of the above

Correct Answer : zinc sulphide

For an P-N-P transistor in normal operation its junction are biased as

emitter base : reverse, collector base : reverse

emitter base : reverse, collector base : forward

emitter base : forward, collector base : forward

emitter base : forward, collector base : reverse

Correct Answer : emitter base : forward, collector base : reverse

ECE MCQ's

Satellite Communication

Communication Systems

Microwave Communication

Automatic Control Systems

Materials and Components