CS/B.Tech/(PWE-NEW)/SEM-6/PWE-604/2013
2013
ELECTRICAL EQUIPMENT IN POWER GENERATION,
TRANSMISSION AND DISTRIBUTION
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 :
10x1 = 10
i) Purging of H 2 gas inside the Turbogenerator is done by
a) Compressed air b) CO2 gas
c) N2 gas d) all of these.
ii) The complete bearing is insulated from foundation/end
shield to
a) prevent flow of shaft current
b) improve the mechanical strength
c) allow gas passage
d) control the temperature.
iii) At underexcited condition, which part of the generator
gets overheated ?
a) Overhang portion of stator winding
b) Overhang portion of rotor winding
c) Retaining ring portion
d) All of these.
iv) Generator shaft seal oil pressure is kept
a) slightly higher than H2 gas pressure
b) slightly lower than H2 gas pressure
c) equal to H2 gas pressure
d) very higher than H2 gas pressure.
v) In ESP, collecting electode ( i.e. collecting plate ) is
a) positively charged and earthed
b) negatively charged and earthed
c) earthed only
d) none of these.