Power Electronics - ECE Questions and Answers

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In auxiliary commutated chopper, the peak value of thyristor current is

equal to peak value of load current

equal to peak value of capacitor current

sum of peak value of load current and capacitor current

none of the above

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The symbol in figure is for

SUS

SBS

SCS

Shockley diode

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If peak value of input voltage is V_m and firing angle is a, the average output voltage for single phase half wave and single phase full wave regulators are

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The static equalisation circuit for thyristors connected in series is

one resistor in series with each thyristor

one resistor in parallel with each thyristor

one resistor and one capacitor in parallel with each thyristor

none of the above

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A cycloconverter is a group of controlled rectifiers.

True

False

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A single phase full wave regulator feeds a resistive load. The firing angle of thyristors is 90°. The input power factor is

0.707 lagging

0.5 lagging

0.2 lagging

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The leads in a TRIAC are denoted by

anode cathode, gate

T₁ T₂, gate

T₁, T₂, anode

T₁, T₂, T₃

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A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency

must be a sub-multiple of input frequency

can be any frequency

must be an even sub-multiple of input frequency

must be an odd sub-multiple of input frequency

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In a single phase full wave regulator, the rms current in each thyristors is I_r The run load current is equal to

2I_r

2 I_r

I_r