Test: Power Electronics - 8 - Electrical Engineering (EE) MCQ

A single phase semiconverter is feeding a highly inductive load and has a freewheeling diode across the load. The waveshape of input current is

In the below figure, the load is highly inductive. The firing angle is a for each of the thyristors. The periods of conduction of Th₁ and Th₂ respectively are

A crowbar circuit is generally needed for protection under fault conditions.

The number of leads in a DIAC are

Forward rating of an SCR is

The condition for underdamped oscillations in a series RLC circuit is

The method of triggering SCS is

The number of thyristors in a single phase fully controlled bridge rectifier is

In a bridge inverter

An ideal rectifier should have

When thyristors are connected in parallel, the current distribution may become non-uniform due to

A single phase fully controlled bridge converter is fed by a voltage V_m sin ωt. The average and rms values of output voltage are

In a single phase half wave ac regulator feeding a resistive load, the rms load current

Which of the following is correct for a BJT?

In a bridge inverter with single pulse width modulation

In a modified series inverter with two inductors and two capacitors, the load current

The number of layers in a Shockley diode are

In a modified series inverter

Assertion (A): Light triggering is very suitable for HVDC transmission.

Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.

Class A and class B chopper

To turn off an SCR, it is necessary to reduce its current to less than :

When a single phase dual converter is operating in circulating current mode