All inverters use forced commutation. True False Line commutated inverters are a

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Question
All inverters use forced commutation.
Options
A. True
B. False

Correct Answer

False

Explanation

Line commutated inverters are also used especially in HVDC.

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2. Space communication links are being increasingly moved into Ka-band (200-30 GHz) because it
Options
A. offers a much wider available bandwidth
B. does not suffer from atmospheric at tenuation
C. permits the use of smaller antenna
D. does not suffer from rain attenuation

4. In the context of error detection in satellite transmission, ARQ stands for
Options
A. Automatic Repeat Request
B. Automatic Relay Request
C. Accelerated Recovery Request
D. Automatic Radiation Quenching

6. Assertion (A): A dual converter may be circulating current type or non circulating current type.
Reason (R): In circulating current dual converter only one converter can be operated at one time.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

7. The two modes of operation of three phase bridge inverters are known as
Options
A. 60� mode and 120� mode
B. 90� mode and 120� mode
C. 120� mode and 180� mode
D. 120� mode and 240� mode

8. A single phase step up cycloconverter changes 50 Hz to 100 Hz. Then one half wave of input will give rise to
Options
A. one half wave of output
B. one full wave of output
C. two full waves of output
D. either (b) or (c)

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