Cycloconverters – 1 – 1

1. A cycloconverter is a :

(a) Frequency changer from higher to lower frequency with one-state conversion
(b) Frequency changer from higher to lower frequency with two-stage conversion
(c) Frequency changer from lower to higher frequency with one-stage conversion
(d) Either a or c

ANSWER

EXPLANATION

2. The cycloconverter require natural or forced commutation as under :

(a) Natural commutationin bothstep-up and step down cycloconverter
(b) Forced commutation in both step-up and step-down cycloconverter
(c) Forced commutation in step-up cycloconverter
(d) Forced commutation in step-down cycloconverter

ANSWER

EXPLANATION

3. The quality of output ac voltage of a cycloconverter is improved with :

(a) Increase in output voltage at reduced frequency
(b) Increase in output voltage at increased frequency
(c) decrease in output voltage at reduced frequency
(d) decrease in output voltage at increased frequency

ANSWER

EXPLANATION

4. How many switches are used to construct a three-phase to three-phase cycloconverter ?

(a) 3
(b) 6
(c) 12
(d) 18

ANSWER

EXPLANATION

5. A four quadrant chopper cannot be operated as :

(a) One quadrant chopper
(b) Cycloconverter
(c) Inverter
(d) Bidirectional rectifier

ANSWER

EXPLANATION

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