Electrical Engineering MCQs

Page No. 360

A thyristor can termed as__________?


aAC switch

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bDC switch

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cBoth a and B

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dSquare wave switch

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View Answer DC switch

Which of the following is used in heat sink_____________?


aIron

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bAluminium

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cCarbon

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dSilver

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View Answer Aluminium

How can we protect SCR from thermal conditions _____________?


aUse of snubber circuit.

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bUsing heat sink.

✓


cUsing CB and fuse.

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dUsing equalizing circuit

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View Answer Using heat sink.

Thyristor is nothing but a____________?


aControlled transistor

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bControlled switch

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cAmplifier with higher gain

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d Amplifier with large current gain

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View Answer Controlled switch

Gate circuit or triggering circuit of a thyristor is


alower power circuit.

✓


bhigh power circuit.

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cmagnetic circuit.

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dmay be low power or high power circuit

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View Answer lower power circuit.

After proper turn on of thyristor____________?


agate signal is always present

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bgate signal must be removed

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cgate signal should present but can be removed

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dnone of the above.

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SCR will be turned off when anode current is_______________?


a< latching current but greater than holding current and gate signal is 0.

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bless than holding current.

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c< latching current but greater than holding current and gate signal is present.

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dboth (A) and (B).

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View Answer both (A) and (B).

The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?


a600 V/µs

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b800 V/µs

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c1200 V/µs

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d1000 V/µs

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View Answer 800 V/µs

BCT is used for____________?


aHigh power phase control

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bHigh power current control

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cLow power current control

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dLow power phase control

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Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?


aVc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.

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bVc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.

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cVc1 = Vc2 = Vc3 any value of Ig.

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dVc1 > Vc2 > Vc3 when Ig1 ≥ Ig2 &Atil

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