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1

GATE EE 1999

Subjective
A three phase diode bridge is used to provide rectified output from a $$400V,$$ $$50$$ $$Hz,$$ $$3$$- phase supply to a $$R$$ $$-$$ $$L$$ load with $$10\,\,\Omega $$ resistance and $$300$$ $$mH$$ inductance.
Determine the
(a)$$DC$$ level of the output voltage
(b) $$RMS$$ value of the diode current
(c) $$RMS$$ value of the source current, and
(d) Apparent power drawn from the mains

Answer

(a) $$540.18$$ $$V$$
(b) $$31.18$$ $$V$$
(c) $$44.2$$ $$A$$
(d) $$30.6$$ $$kVA$$
2

GATE EE 1997

Subjective
An $$SCR$$ is connected in series with a $$300V$$ $$ac$$ supply and a $$300$$ ohms load resistor calculate

(a) The reading of a moving coil ammeter connected in series with the load and

(b) The reading of a moving iron voltmeter connected across the $$SCR$$ for firing angle of $${45^ \circ }$$

Answer

(a) $$0.384$$ $$A$$
(b) $$221.6$$ $$V$$
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Questions Asked from Single and Three Phase Rectifier

On those following papers in Marks 5
Number in Brackets after Paper Indicates No. of Questions
GATE EE 1999 (1)
GATE EE 1997 (1)

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