Test: Power Electronics - Electrical Engineering (EE) MCQ

In the above question, Voltage ripple Factor will be

The circuit shown in figure is initially relaxed. If the thyristor is turn on at t = 0, what is the conduction time of thyristor

In a thyristor, the holding current I_H is

In the circuit shown below the thyristor is fired at an angle π/4 in every positive half cycle of the input
ac voltage the average power across the load will be

A half controlled bridge converter is operating from an r.m.s input voltage of 120V. Neglecting the voltage drops, what are mean load voltage at a firing & delay angle of 0⁰ and 180⁰ respectively.

In the single phase diode bridge rectifier shown in figure, the load resistor is R = 50 The source
voltage is V = 200 sin(ωt), where ω = 2π x 50 rad/s. The power dissipated in the load resistor R is

A bridge converter is fed from a source V_S = V_m sinωt as shown in following figure. What will be the
output voltage for a firing angle of α. Assume continuous conduction

A DC battery of 50V is charged through a 10Ω resistor as shown in the figure. Assume that the thyristor is continuously fired. The average value of charging current is

In the given figure, if the triggering angle of thyristor is 1200, the extinction angle will be

The power electronics converter shown in figure has a single pole double throw switch. The pole P of
the switch is connected alternatively to A and B.

The converter shown is a

In previous question let V_in = 200V and output voltage of 150V load resistance is 10 ohms.
The value of duty cycle is 

In previous question, RMS load current and RMS thyristor current are respectively

What is the value of effective input resistance

The given figure shows a step-down chopper switched at 1 kHz with a duty ratio of 0.5. Assume the load
current is continuous

The minimum value of instantaneous current is

In the previous question, the maximum value of instantaneous current is

A step-down chopper is operated in the continuous conduction mode at a frequency of 4 KHz. If the dc
output and input voltage are 150V and 220V respectively

the on (T_on) and off period T_off of
the thyristor in each cycle

The given figure shows a step-down chopper switched at 1 KHz with a duty ratio δ= 0.5, the peak to peak
ripple in load current is close to

The given figure shows a step-down chopper. A free wheeling diode is placed across the load. The load
current varies between the limits of 10A and 12A. The time ratio would be

A single phase half bridge inverter shown in figure has a resistive load of R = 3 and dc input voltage V_dc = 50V

the Fundamental component of RMS output voltage and the output power are

In the previous question, the average current through each thyristor will be

A single phase full bridge inverter has square wave output voltage. What is the percentage of fifth
harmonic component in relation to the fundamental component?

A single phase inverter is operated in PWM mode generating a singlepulse of width 2d in centre of each
half cycle as shwon in figure. It is found that output voltage is free from 5th harmonic for pulse width
1440. What will be percentage of 3rd harmonic present in output voltage