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DGVCL Exam Paper (11-12-2011)

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 %
0.4 %
4 %
6 %

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)
The form factor in AC means the ration of

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

ANSWER DOWNLOAD EXAMIANS APP

DGVCL Exam Paper (11-12-2011)
In a series RLC circuit at resonance

Current is maximum and power factor is 0.5
Current is minimum and power factor is unity
Current is maximum and power factor is unity
Current is minimum and power factor is 0.5

ANSWER DOWNLOAD EXAMIANS APP

DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Lightning
Unbalanced protection
Switching over voltages
Magnetizing inrush current

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)
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
10 MVA
20 MVA
60 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?

Shunt motor
Cumulatively compounded motor
Series 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

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

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