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1

GATE EE 2007

MCQ (Single Correct Answer)
A single $$-$$ phase, $$230$$ $$V$$, $$50$$ $$Hz$$ $$ac$$ mains fed step down transformer $$(4:1)$$ is supplying power to a half $$-$$ wave uncontrolled $$ac$$ $$-$$ $$dc$$ converter used for charging a battery ($$12$$ $$V$$ $$dc$$) with the series current limiting resistor being $$19.04\,\Omega $$. The charging current is
A
$$3.43$$ $$A$$
B
$$1.65$$ $$A$$
C
$$1.22$$ $$A$$
D
$$1.0$$ $$A$$
2

GATE EE 2006

MCQ (Single Correct Answer)
A single - phase bridge converter is used to charge a battery of $$200$$ $$V$$ having an internal resistance of $$2\,\,\Omega $$ as shown in figure. The $$SCRs$$ are triggered by a constant $$dc$$ signal. If $$SCR$$ $$2$$ gets open circuited, what will be the average charging current?
A
$$23.8A$$
B
$$15A$$
C
$$11.9A$$
D
$$3.54A$$
3

GATE EE 2006

MCQ (Single Correct Answer)
A $$3$$ $$-$$ phase fully controlled bridge converter with free wheeling diode is fed from $$400$$ $$V$$, $$50$$ $$Hz$$ $$AC$$ source and is operating at a firing angle of $${60^ \circ }.$$ The load current is assumed constant at $$10A$$ due to high load inductance The input displacement factor $$(IDF)$$ and the input power factor $$(IPF)$$ of the converter will be
A
$$IDF=0.867:IPF=0.828$$
B
$$IDF=0.867:IPF=0.552$$
C
$$IDF=0.5:IPF=0.478$$
D
$$IDF=0.5:IPF=0.318$$
4

GATE EE 2006

MCQ (Single Correct Answer)
A solar cell of $$350V$$ is feeding power to an $$ac$$ supply of $$440$$ $$V,$$ $$50$$ $$Hz$$ through a $$3$$- phase fully controlled briodge converter. A large inductance is connected in the $$dc$$ circuit to maintain the $$dc$$ current at $$20A.$$ If the solar cell resistance of $$0.5\Omega ,$$ then each thryristor will be reverse biased for a period of
A
$${125^ \circ }$$
B
$${120^ \circ }$$
C
$${60^ \circ }$$
D
$${55^ \circ }$$

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