POWER ELECTRONICS QUIZ

For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

11.19 ohm

108 ohm

111.9 ohm

115 ohm

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A GTO can be turned on by applying

Positive drain signal.

Positive gate signal.

Positive source signal.

None of these.

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Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

Cut-off

Negative resistance

Saturation

None of these

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The typical value of SCR for modern alternator is

0.5.

1.5.

1.0.

1.2.

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Light triggering mainly used in

all of these.

low - voltage direct current transmission.

high voltage direct current transmission.

medium voltage direct current transmission.

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A power semiconductor may undergo damage due to

High di/dt.

High dv/dt.

Low di/dt.

Low dv/dt.

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Materials used in heat sink should have

high melting point.

large surface area.

high thermal conductivity.

All of these.

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Power electronics essentially deals with control of a.c. power at ___________.

Frequencies above 20 kHz

Frequencies above 1000 kHz

50 Hz frequency

Frequencies less than 10 Hz

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A single phase full bridge inverter can operated in load commutation mode in case load consist of

RLC overdamped.

RL.

RLC underdamped.

RLC critically damped.

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A diac is turned on by ___________.

Gate current

Gate voltage

None of these

A breakover voltage

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