Electrical Engineering MCQs

Page No. 347

Ripple factor is the ratio of______________________?


aRms value of the ac component of load voltage to the dc voltage


bAverage value of the ac component of load voltage to the peak value of voltage


c Average value of the dc component of load voltage to the ac voltage


d Peak value of the dc component of load voltage to the ac voltage



Form factor of a rectifier is the ratio of ______________?


aRoot mean square value of voltage and current to its peak value


bRoot mean square value of voltage and current to its average value


cAverage value of current and voltage to its root mean square value


dPeak value of current and voltage to its root mean square value



Silicon controlled rectifier can be turned on____________?


aBy applying a gate pulse and turned off only when current becomes zero


bAnd turned off by applying gate pulse


c By applying a gate pulse and turned off by removing the gate pulse


d By making current non zero and turned off by making current zero



TRIAC is a semiconductor power electronic device which contains____________?


aTwo SCR’s connected in reverse parallel


bTwo SCR’s connected in parallel


cTwo SCR’s connected in series


dTwo BJT’s connected in series



The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as_____________________?


aboth as forward characteristics


b both as reverse characteristics


cformer as forward characteristics and later as reverse characteristics


dformer as reverse characteristics and later as forward characteristics



An SCR can be used___________?


a as static conductor


bfor power control


cfor speed control of dc shunt motor


dAll of these


View Answer All of these

With gate open, the maximum anode current at which SCR is turned off from ON condition is called____________?


abreakdown voltage


bpeak reverse voltage


c holding current


dlatching current


View Answer holding current

A crowbar is a circuit which is used to protect a_____________?


avoltage sensitive load from excessive dc power supply output voltages


bcurrent sensitive load from excessive dc power supply output voltages


cvoltage sensitive load from excessive ac power supply output voltages


d current sensitive load from excessive ac power supply output voltages



Bidirectional semiconductor device is___________?


aDiode


bBJT


cSCR


dTRIAC


View Answer TRIAC

A full wave rectifier with resistive load produces___________?


aSecond harmonic


bThird harmonic


cFifth harmonic


dDo not produce harmonics



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