An electronic switch S is required to block voltages of either polarity during its OFF state as shown in Figure a. This switch is required to conduct in only one direction during its ON state as shown in Figure b.

Which of the following are valid realizations of the switch S?

For perfectly balanced operation a certain three phase ac power electronic circuit generates odd harmonic currents of order five and seven in the three phases of the ac mains. Identify which of these harmonics form a positive-sequence system, and which form a negative – sequence system.

The uncontrolled electric switch employed in power electric converters is:

The triac can be used only in

A switched mode power supply operating at 20 kHz to 100 kHz range uses as the main switching element