Power Electroni...

A DC-DC converter operates in conduction mode. It has a 36 V input voltage and it feeds a resistive load of 18 Ω. The switching frequency of the converter is 200 Hz. If the switch-on duration is 1.25 ms, which of the following is/are true?

The output voltage of a single-phase full-bridge voltage source inverter is controlled by unipolar PWM with one pulse per half cycle. The input voltage of the inverter is 100 V. For the fundamental RMS component of the output voltage to be 70% of DC voltage, which of the following is/are true?

A three-phase full-wave half-controlled converter supplies a highly inductive load with R = 10 Ω the supply is a three-phase star connected with 400 V RMS. The value of firing angle in degrees, to obtain the dc output current as 15 A is _______

A single-phase half wave controlled rectifier supplied from 230 V a.c. supply is operating at α = 60°. If the load resistor is 10 Ω, the power factor at the ac source is _______

A step-down chopper has input voltage 200 V and o/p voltage 140 V. If the conduction time of thyristor chopper is 70 μ sec. Now if the frequency operation is increased by 25% keeping conduction time of thyristor constant than find the average value of new output voltage.

A 3-ϕ 180° mode bridge inverter has star connected load of R = 4 Ω and L = 25 mH. The inverter is feed from 220 V dc and its output frequency is 50 Hz. Find the fundamental component of line voltage.

AN SCR requires 50 mA gate current to switch it ON. The driver circuit supply voltage is 10 V. The gate-cathode drop is about 1 V and the voltage drop across diode is also 1 V. The resistive load supplied from a 100 V supply is

A class – A chopper circuit is supplied DC source voltage 100 V. The chopper supplies power to a series R-L load with R = 0.5 Ω and L = 1 mH. The chopper switch is ON for 1 ms in an overall period of 3 ms. The minimum value of load current is ______ (in A). Assume continuous current operation of the chopper.

A single-phase midpoint converter supplied from 240/120 V, 50 Hz transformer is connected to a load of 15 Ω resistance and infinite inductance. If the secondary winding of the transformer has a line inductance of 20 mH, which of the following is/are true for a firing angle of 60°?