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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

20 MVA
60 MVA
50 MVA
10 MVA

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Short circuit kVA = Base kVA/%X

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

0.4 %
5 %
6 %
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)
In the protection of transformers, harmonic restraint is used to guard against

Switching over voltages
Lightning
Magnetizing inrush current
Unbalanced protection

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Initial inrush of magnetizing currents have high component of even and odd harmonics.
2nd - 63%
3rd -26.8%
4th- 5.1%
5th- 4.1%
6th- 3.7
7th-2.4

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

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

ANSWER DOWNLOAD EXAMIANS APP

DGVCL Exam Paper (11-12-2011)
If a 5 A fuse is blown frequently in a house lighting circuit, it is required to

Reduce the load
Check the load
Insert a fuse of higher current rating
Insert a fuse of higher voltage rating

ANSWER DOWNLOAD EXAMIANS APP

DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Phase shifting transformer
Single pole switching of circuit breakers
Increasing the turbine valve opening
Excitation control

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON DGVCL Exam Paper (11-12-2011)

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