CS/B.Tech(PWE)/SEM-8/PWE-804B/2012
2012
HVDC TRANSMISSION
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
GROUP – A
( Multiple Choice Type Questions )
1. Choose the correct alternatives for any ten of the following :
10 × 1 = 10
i) A DC reactor is connected in series with each pole of a
converter station in order to
a) prevent communication failures in the inverter
b) supply reactive power to the converter
c) improve system stability
d) increase the power transfer capability.
ii) The power transmission capability of bipolar lines is
approximately
a) half that of 3-phase single circuit line
b) the same as that of 3-phase single circuit line
c) twice that of 3-phase single circuit line
d) thrice that of 3-phase single circuit line.
iii) HVDC transmission voltage in India is
a) ± 400 kV b) ± 500 kV
c) ± 600 kV d) ± 765 kV.
iv) For an SCR, 
protection is achieved through use of
a) RL in series with SCR b) RC across SCR
c) L in series with SCR d) RC in series with SCR.
v) The effect of source inductance on performance of three
phase full converters is to
a) reduce the ripples in the load current
b) make discontinuous current as continuous
c) reduce the output voltage
d) increase the load voltage.