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Test: Cyclo Converters - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test GATE Electrical Engineering (EE) 2024 Mock Test Series - Test: Cyclo Converters

Test: Cyclo Converters for Electrical Engineering (EE) 2024 is part of GATE Electrical Engineering (EE) 2024 Mock Test Series preparation. The Test: Cyclo Converters questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Cyclo Converters MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Cyclo Converters below.
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Test: Cyclo Converters - Question 1

Applications of cycloconverters include

Detailed Solution for Test: Cyclo Converters - Question 1

Speed of induction machines can be controlled by controlling the input frequency. In induction heating, eddy current is proportional to the square of input frequency.

Test: Cyclo Converters - Question 2

A three-phase cycloconverter is used to find the variable frequency single-phase ac output. If the single-phase ac load is 240 V, 50 A at a power factor of 0.8 lagging, find the RMS value of input voltage per phase

Detailed Solution for Test: Cyclo Converters - Question 2

Given,
Vout(rms)= 240 V
m = 3 (for 3 phase)
We know that the fumdamental value of rms output voltage is given by




= 290 V

Test: Cyclo Converters - Question 3

The principle of three phase cycloconverter is to

Detailed Solution for Test: Cyclo Converters - Question 3

The basic principle of three phase cycloconverter is to vary progressively the firing angle of the controlling devices.

Test: Cyclo Converters - Question 4

In a three phase half-wave cycloconverter ___________

Detailed Solution for Test: Cyclo Converters - Question 4

During the conversion process, the current flows in both the directions, hence both inverting and converting action takes place.

Test: Cyclo Converters - Question 5

A cycloconverter is a _________

Detailed Solution for Test: Cyclo Converters - Question 5

A cycloconverter converters input power at one frequency to output power at a different frequency with one-stage conversion.

Test: Cyclo Converters - Question 6

A cycloconverter fed induction motor drive is widely used for which one of the following?

Detailed Solution for Test: Cyclo Converters - Question 6

Cycloconverters are mainly used where precise speed control is needed. It means cycloconverter is not suitable for cement mill drive as well as compressor drive. Papermill requires constant speed drive. So cycloconverter fed induction motor drive is widely used for machine tool drive.

Test: Cyclo Converters - Question 7

 In the positive half cycle from ωt = 0 to π

Detailed Solution for Test: Cyclo Converters - Question 7

In the positive half cycle, upper terminal is positive of the upper secondary and the lower terminal is negative for the lower secondary. Hence, P1 and N2 are forward biased.

Test: Cyclo Converters - Question 8

In the positive half cycle, _________ SCRs are forward biased.

Detailed Solution for Test: Cyclo Converters - Question 8

Pairs P1, P2 and N1, N2 are forward biased from ωt = 0 to π.

Test: Cyclo Converters - Question 9

In three phase cycloconverters, the reduction factor is given by

Detailed Solution for Test: Cyclo Converters - Question 9

Reduction factor = output frequency/input frequency.

Test: Cyclo Converters - Question 10

In the below given cycloconverter circuit, _________ and _________ conduct in one cycle together.

Detailed Solution for Test: Cyclo Converters - Question 10

In the positive half cycle, upper terminal is positive of the upper secondary and the lower terminal is negative for the lower secondary. Hence, P1 and N2 are forward biased. And likewise, N1 and P2 will conduct in the next half cycle.

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