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GATE 2019: Power Electronics Quiz 5 (App update required to attempt this test)

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Question 1

A single phase full bridge converter with a free wheeling diode feeds an inductive load. The load has large inductance, hence, the output current is constant. The load also consists of a resistance of 11.3Ω. The input voltage source is a 220V, 50Hz source. For a firing angle delay of 45⁰, find the average value of freewheeling diode current.

Question 2

A 1-Φ voltage controller is employed for controlling the power flow from 230 V source into a load circuit R=5Ω and ωL=7Ω. calculate the power factor of source for delivering the maximum power of load.

Question 3

A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature current is 5A without any ripple. The armature resistance is 2 Ω. The converter is working from a 230 V, single-phase ac source with a firing angle of 30^o. Under this operating condition, the speed of the motor will be

Question 4

A single phase transformer, with secondary voltage of 230 V, 50 Hz, delivers power to load R = 10 Ω through a half wave controlled rectifier circuit. If the firing angle is 60 ° then the rectification efficiency is ------ %.

Question 5

A battery is being charged through a half-wave rectifier as shown in figure.

If the average charging current is assumed to be constant at 5 A then the value of current limiting resistance R is ______ Ω.

Question 6

For the element values given in the circuit, and the initial current through the inductor is

. Initial voltage across the capacitor

. The values of conduction time of thyristor and capacitor voltage after thyristor is turned OFF are

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ESE & GATE EE Power Electronics

Jun 16ESE & GATE EE