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DGVCL Exam Paper (11-12-2011)

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

Voltage drop
Corona loss
Temperature rise
Radio interference

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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

4 %
6 %
5 %
0.4 %

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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%

DGVCL Exam Paper (11-12-2011)
Reactance relay is used to protect against

Earth faults only
Phase faults only
Both phase and earth faults
Over voltage faults

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DGVCL Exam Paper (11-12-2011)
The mutual inductance between two unity coupled coils of 9 H and 4 H is

6 H
36 H
13 H
2.2 H

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DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

No harmonic problems
Simple protection
Minimum line power losses
Low cost of HVDC terminals

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DGVCL Exam Paper (11-12-2011)
The best location of the power factor correction equipment to be installed in the transmission line is at

The sending end
Middle of the line
Any place
The receiving end

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

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