Electrical Engg (EEE) - MCQ Practice Questions

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?

Which topology is preferred for high-power renewable energy inverters (>100kW) in 2024-25 grid applications?

In a synchronous buck converter, if the duty cycle is 0.7 and the switching frequency is 500kHz, what is the approximate inductor ripple current (ΔIL) with input voltage 48V and output voltage 24V?

A diode-clamped five-level inverter reduces the voltage stress on individual switches compared to a two-level inverter by a factor of:

A single-phase AC voltage controller with a resistive load has a firing angle of 45°. What is the RMS output voltage as a fraction of input RMS voltage?

A resonant DC-link inverter operates at 200kHz. The resonant frequency must be:

In isolated DC-DC converters for EV fast-charging stations, which topology provides the best isolation and efficiency above 1kW?

A voltmeter has an internal resistance of 100 kΩ and shows a reading of 50 V across a 1 MΩ resistor. What is the true voltage across the resistor?

For accurate power measurement in a three-phase system with unbalanced load, the minimum number of wattmeters required is:

In an AC bridge at balance condition, if R₁ = 100 Ω, R₂ = 50 Ω, and R₃ (inductive) = 200 Ω with series R, then R₄ is: