The uncontrolled electronic switch employed in power-electronic converters is

Derating factors for parallel connection of thyristors are normally in the range

It is recommended to use UJT oscillator for gate-triggering of the thyristors mainly because

UJT oscillators are used for gate-triggering of thyristors for

The device which cannot be triggered by voltage of either polarity is

As compared to UJT, SUS

If gate current is increased, the anode-cathode voltage at which SCR closes is

Which of the following conditions is necessary for triggering system for thyristors?

For thyristors, pulse triggering is preferred to triggering because

In a GTO, anode current begins to fall when gate current

Which of the following PNPN devices does not have a gate terminal?

Power MOSFET is a

When transistors are used in series or parallel, a snubber circuit is used to

A device that does not exhibit negative resistance characteristic is

Optocouplers combine

In series connection, thyristor having the highest leakage resistance or low voltage current will share

The normal way to close a SCR is by

In a GTO, anode current begins to fall when gate current

In a SCR circuit, the angle of conduction can be changed by changing

When a UJT is used for triggering of an SCR, the waveshape of the voltage is a