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

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

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

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

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Form factor of a rectifier is the ratio of ______________?


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

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

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

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

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Silicon controlled rectifier can be turned on____________?


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

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bAnd turned off by applying gate pulse

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

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

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TRIAC is a semiconductor power electronic device which contains____________?


aTwo SCR’s connected in reverse parallel

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bTwo SCR’s connected in parallel

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cTwo SCR’s connected in series

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dTwo BJT’s connected in series

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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

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b both as reverse characteristics

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cformer as forward characteristics and later as reverse characteristics

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dformer as reverse characteristics and later as forward characteristics

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An SCR can be used___________?


a as static conductor

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bfor power control

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cfor speed control of dc shunt motor

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dAll of these

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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

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bpeak reverse voltage

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c holding current

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dlatching current

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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

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bcurrent sensitive load from excessive dc power supply output voltages

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cvoltage sensitive load from excessive ac power supply output voltages

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d current sensitive load from excessive ac power supply output voltages

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Bidirectional semiconductor device is___________?


aDiode

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bBJT

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cSCR

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dTRIAC

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View Answer TRIAC

A full wave rectifier with resistive load produces___________?


aSecond harmonic

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bThird harmonic

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cFifth harmonic

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dDo not produce harmonics

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