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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

50 MVA
60 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?

Differentially compounded motor
Cumulatively compounded motor
Series motor
Shunt 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)
A fixed step by step procedure for finding the solution of a problem on computer is called

Algorithm
Hardware
Logic
Software

ANSWER DOWNLOAD EXAMIANS APP

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

36 H
13 H
2.2 H
6 H

ANSWER DOWNLOAD EXAMIANS APP

DGVCL Exam Paper (11-12-2011)
The efficiency of a transformer at full load, 0.8 p.f. lag is 90%. Its efficiency at full load, 0.8 p.f. lead will be

80 %
More than 90%
Less than 90%
90 %

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Efficiency= output power/input power
efficiency = (v*i*cosφ)/((v*i*cosφ)+(x² Pc)+(Pi)) x=fractional part of full load

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

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

ANSWER DOWNLOAD EXAMIANS APP
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