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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
If the percentage reactance of the system upto the point of fault is 20% and the base kVA is 10,000 the short ciruit kVA is

60 MVA
50 MVA
20 MVA
10 MVA

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Short circuit kVA = Base kVA/%X

DGVCL Exam Paper (11-12-2011)
Which motor is used to start heavy loads?

Series motor
Cumulatively compounded motor
Shunt motor
Differentially compounded motor

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Torque in d.c motor = k* φ * Ia
In series motor φ α Ia
Tα I²
starting torque of dc series motor is high

DGVCL Exam Paper (11-12-2011)
If the excitation of a synchronous generator fails, it acts as a

Synchronous generator
Induction generator
Induction motor
Synchronous motor

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

if excitation of synchronous generator fails, operate as induction motor

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
Any place
Middle of the line
The receiving end

ANSWER DOWNLOAD EXAMIANS APP

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 %
4 %
0.4 %

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%

DGVCL Exam Paper (11-12-2011)
If the dielectric strength of the medium between the contacts builds up more rapidly than the restriking voltage the arc will

Extinguish
Decrease in size
Increase in size
Restrike

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

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