Electrical Engg (EEE) - MCQ Practice Questions

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:

The dv/dt rating of a power semiconductor is important because it:

In a three-level diode-clamped inverter (Neutral Point Clamped), the advantage over two-level inverter is:

Which control strategy for a DC-DC converter provides the tightest output voltage regulation under varying input voltage and load conditions?

In a synchronous buck converter, the advantages of using a low-side MOSFET instead of a diode are:

In a forward converter, the energy stored in the magnetizing inductance during the ON time is transferred to:

The average output voltage of a three-phase half-wave uncontrolled rectifier is:

In a synchronous rectifier design, the gate drive signal for the MOSFET switch should be synchronized with:

The phenomenon of 'latch-up' in power semiconductor devices occurs due to:

A single-phase half-wave rectifier with a firing angle of 45° is connected to a 230V, 50Hz AC source. Calculate the RMS output voltage.

In a controlled rectifier circuit, the commutation overlap angle (μ) depends on:

Which parameter determines the minimum OFF-time in a PWM converter?

For an AC voltage controller with RMS output voltage of 230V from a 230V, 50Hz source at 30° firing angle, what is the power factor?

In a soft-switching zero-voltage switching (ZVS) converter, the main advantage is:

A MOSFET with on-state resistance RDS(on)=0.5Ω carries an average current of 50A at 100kHz. What is the approximate conduction loss?