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1

GATE EE 2017 Set 2

MCQ (Single Correct Answer)
A phase-controlled, single-phase, full-bridge converter is fed from a $$230$$ $$V,$$ $$50$$ $$Hz,$$ $$AC$$ source. The fundamental frequency in $$Hz$$ of the voltage ripple on the $$DC$$ side is
A
$$25$$
B
$$50$$
C
$$100$$
D
$$300$$
2

GATE EE 2017 Set 2

MCQ (Single Correct Answer)
In the circuit shown, the diodes are ideal, the inductance is small, and $${{\rm I}_0} \ne 0.$$ Which one of the following statements is true?
A
$${D_1}$$ conducts for greater than $${180^ \circ }$$ and $${D_2}$$ conducts for greater than $${180^ \circ }$$
B
$${D_2}$$ conducts for more than $${180^ \circ }$$ and $${D_1}$$ conducts for $${180^ \circ }$$
C
$${D_1}$$ conducts for $${180^ \circ }$$ and $${D_2}$$ conducts for $${180^ \circ }$$
D
$${D_1}$$ conducts for more than $${180^ \circ }$$ and $${D_2}$$ conducts for $${180^ \circ }$$
3

GATE EE 2012

MCQ (Single Correct Answer)
A half-controlled single-phase bridge rectifier is supplying an $$R$$-$$L$$ load. It is operated at a firing angle $$α$$ and the load current is continuous. The fraction of cycle that the freewheeling diode conducts is
A
$${1 \over 2}$$
B
$$\left( {1 - {\alpha \over \pi }} \right)$$
C
$${\alpha \over {2\pi }}$$
D
$${\alpha \over {\pi }}$$
4

GATE EE 2010

MCQ (Single Correct Answer)
The fully controlled thyristor converter in the figure is fed from a single-phase source. When the firing angle is $${0^ \circ }$$, the $$dc$$ output voltage of the converter is $$300V.$$ What will be the output voltage for a firing angle of $${60^ \circ }$$, assuming continuous conduction?
A
$$150V$$
B
$$210V$$
C
$$300V$$
D
$$100\pi V$$

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