Power Electronics - Part 1 Online Exam Quiz

Power Electronics - Part 1 GK Quiz. Question and Answers related to Power Electronics - Part 1. MCQ (Multiple Choice Questions with answers about Power Electronics - Part 1

A cycloconverter can be

Options

A : step down

B : step up

C : step down or step up

D : none of the above

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In the below figure the average load current is 15 A. The rms value of transformer secondary current is

Options

A : 15 A

B : 10.61 A

C : 7.5 A

D : 14.14 A

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In a 3 phase fully controlled converter the firing frequency is

Options

A : 3 times the line frequency

B : 6 times the line frequency

C : 9 times the line frequency

D : 12 times the line frequency

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Two thyristor of same rating and same specifications

Options

A : will have equal turn on and turn off periods

B : will have equal turn on but unequal turn off periods

C : may have equal or unequal turn on and turn off periods

D : will have unequal turn on and turn off periods

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The amount of dielectric heating is inversely proportional to frequency.

Options

A : True

B : False

C : -

D : -

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A semiconverter feeding an RLE load operates in

Options

A : first quadrant only

B : first and second quadrants

C : first and fourth quadrants

D : first and third quadrants

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The phenomenon of overlap in converter operation due to

Options

A : source resistance

B : source inductance

C : both source resistance and source inductance

D : high value of firing angle

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A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is

Options

A : 20 W

B : 50 W

C : 92 W

D : 128 W

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For a 12 pulse operation, the two 6 pulse units are fed by

Options

A : Y - Y and Y - Y transformers

B : ? - ? and ? - ? transformers

C : Y - Y and Y - ? transformers

D : Y - ? and Y - ? transformers

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In a single phase full wave converter (M - 2 connection) feeding a highly inductive load, the firing angle for each thyristor is a in the respective half cycle. The period of conduction of each thyristor is

Options

A : p - a

B : p

C : p + a

D : p - 2 a

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