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1

GATE EE 2008

MCQ (Single Correct Answer)
A single phase full bridge converter supplies a load drawing constant and ripple free load current. If the triggering angle is $${30^ \circ },$$ the input power factor will be
A
$$0.65$$
B
$$0.78$$
C
$$0.85$$
D
$$0.866$$
2

GATE EE 2008

MCQ (Single Correct Answer)
A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of $$10$$ $$A$$ at a firing angle of $${30^ \circ }.$$ The approximate Total Harmonic Distortion $$(\% \,\,THD)$$ and $$r.m.s$$ value of fundamental component of the input current will respectively be
A
$$31\,\% $$ and $$6.8$$ $$A$$
B
$$31\,\% $$ $$7.8$$ $$A$$
C
$$66\,\% $$ $$6.8$$ $$A$$
D
$$66\,\% $$ $$7.8$$ $$A$$
3

GATE EE 2007

MCQ (Single Correct Answer)
In the circuit of adjacent figure the diode connects the $$ac$$ source to pure inductance $$L.$$

The diode conducts for

A
$${90^ \circ }$$
B
$${180^ \circ }$$
C
$${270^ \circ }$$
D
$${360^ \circ }$$
4

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
$$1.0$$ $$A$$

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Class 12