HVDC systems are preferable for only long distances. True False

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Question
HVDC systems are preferable for only long distances.
Options
A. True
B. False

Correct Answer

True

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1. In a single phase half wave converter feeding resistive load and full wave converter (M - 2 connection) feeding a resistive load the circuit conditions are similar. The firing angle is a. Then the waveshapes of voltages across thyristors
Options
A. are similar
B. are not similar
C. may be similar or dissimilar
D. are similar only for some values of a

5. A half bridge inverter
Options
A. needs a 3 wire dc supply
B. may use a two wire or 3 wire dc supply
C. has higher output voltage if fed from 3 wire dc supply
D. has higher efficiency if fed from 3 wire dc supply

7. When a dc chopper feeds an RLE load, the load current, during steady state operation
Options
A. remains constant
B. varies between maximum and minimum values
C. may remain constant or vary
D. is constant if R is constant

8. In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors
Options
A. must be isolated
B. may or may not be isolated
C. should be preferably, isolated
D. should not be isolated

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