Electrical Engg (EEE) - MCQ Practice Questions

Which of the following is a unidirectional device in power electronics?

The forward voltage drop across a silicon diode at room temperature is approximately:

Which device is used to convert DC to AC power?

The peak inverse voltage (PIV) rating of a diode is important to prevent:

A single-phase full-wave bridge rectifier with a 230V AC input produces an average output voltage of approximately:

Which of the following thyristors can be turned off by a gate signal?

In a step-down DC-DC converter (buck converter), the output voltage is always:

The switching frequency of power electronic devices is increased to:

A 3-phase diode rectifier (6-pulse) produces a ripple frequency of:

The holding current of an SCR is important because:

In MOSFET, the gate-source voltage at which current starts to flow is called:

A PWM (Pulse Width Modulation) controlled DC motor drive uses which power electronic device?

The commutation of a thyristor in a circuit means:

In a three-phase inverter, 180° conduction mode means:

Which of the following has the lowest on-state voltage drop among power semiconductor devices?

The snubber circuit in power electronics is used to:

In a soft-start thyristor converter, the firing angle is gradually increased to:

The turn-off time (toff) of a power transistor includes:

In a boost converter operating in continuous conduction mode (CCM), the average output voltage relationship is:

In a buck converter, the output voltage is always: