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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
Which of the following power distribution system gives better reliabity ?

Ring main system
DC 3 wire system
Radial system
None of these

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DGVCL Exam Paper (11-12-2011)
The main criterion for the design of a distributor is

Voltage drop
Radio interference
Corona loss
Temperature rise

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DGVCL Exam Paper (11-12-2011)
An over excited synchronous motor draws current at

Leading power factor
Unity power factor
Depends on nature of load
Lagging power factor

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Over excitation : leading current
Under excitation : lagging current
Normal excitation : current with unity PF (in phase current)

DGVCL Exam Paper (11-12-2011)
The form factor in AC means the ration of

Peak value to r.m.s value
R.M.S. value to peak value
Peak value to average value
R.M.S. value to average value

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DGVCL Exam Paper (11-12-2011)
Which lightning stroke is most dangerous?

Direct stoke on tower top
Direct stroke on ground wire
Direct stroke on line conductor
Indirect stroke on conductor

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DGVCL Exam Paper (11-12-2011)
A 3 phase, 6 pole induction motor operates on 440 V, 50 Hz, supply. If the actual speed of the motor is 960 rpm the slip will be

5 %
6 %
0.4 %
4 %

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Ns = 120f/P
Slip=(Ns-Nr)/Ns
Ns = 1000 and Nr = 960
from equation of slip, S = (1000-960)/1000
S = 0.04 or 4%

MORE MCQ ON DGVCL Exam Paper (11-12-2011)

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