1
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
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)
+2
-0.6
A single - phase half controlled converter shown in the figure feeding power to highly inductive load. The converter is operating at a firing angle of $${60^ \circ }.$$ GATE EE 2008 Power Electronics - Single and Three Phase Rectifier Question 13 English

If the firing pulses are suddenly removed, the steady state voltage $$\left( {{V_0}} \right)$$ waveform of the converter will become

A
GATE EE 2008 Power Electronics - Single and Three Phase Rectifier Question 13 English Option 1
B
GATE EE 2008 Power Electronics - Single and Three Phase Rectifier Question 13 English Option 2
C
GATE EE 2008 Power Electronics - Single and Three Phase Rectifier Question 13 English Option 3
D
GATE EE 2008 Power Electronics - Single and Three Phase Rectifier Question 13 English Option 4
3
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
A single phase fully controlled converter bridge is used for electrical braking of a separately excited $$dc$$ motor. The $$dc$$ motor load is represented by an equivalent circuit as shown in the figure. GATE EE 2008 Power Electronics - Single and Three Phase Rectifier Question 12 English

Assume that the load inductance is sufficient to ensure continuous and ripple free load current. The firing angle of the bridge for a load current of $${{\rm I}_0} = 10\,\,A$$ will be

A
$${44^ \circ }$$
B
$${51^ \circ }$$
C
$${129^ \circ }$$
D
$${136^ \circ }$$
4
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
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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