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MGVCL Exam Paper (30-07-2021 Shift 2)

MGVCL Exam Paper (30-07-2021 Shift 2)
A three-phase, 4-pole, 50 Hz induction motor runs at 1425 rpm. Find out the percentage slip of the induction motor.

3%
6%
5%
4%

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Slip, s = (Ns - Nr)/Ns
Ns = 120f/P
Ns = 1500 rpm

s = (1500 - 1425)/1500
s = 0.05
%s = 5%

MGVCL Exam Paper (30-07-2021 Shift 2)
Fill in the blanks with suitable Preposition from the given alternatives.
England skipper Joe Root is excited to bat ____ number three in the Ashes cricket series

at
on
in
over

ANSWER DOWNLOAD EXAMIANS APP

MGVCL Exam Paper (30-07-2021 Shift 2)
A single phase 240 V, 1 kW heater is connected across single phase 240 V, 50 Hz supply through an SCR. For firing angle delay of 90˚, calculate the power absorbed in the heater element.

250 W
275 W
225 W
300 W

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Resistance of heater, R = V²/P
R = 57.6 ohm

RMS value of voltage through controlled SCR = (Vm/2π)*(1 + cosα)
= 120 V

Power absorb by heater = Vrms²/R
= 120²/57.6
= 250 W

MGVCL Exam Paper (30-07-2021 Shift 2)
Calculate the inductance per meter of a 50 Ω load cable that has an capacitance of 20 pF/m.

25 mH
50 nH
50 mH
25 nH

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Characteristic impedance, Z = √(L/C)
50 = √(L/20*10⁻¹²)
L = (50*50)*(20*10⁻¹²)
L = 50000*10⁻¹²
L = 50 nH

MGVCL Exam Paper (30-07-2021 Shift 2)
In the RLC series circuit shown in figure, resonance occurs when the value of C is 20 µF. The supply voltages is v(t) = 20 sin (500t) V. Find the value of L.

5 mH
0.2 mH
0.2 H
5 H

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Here,
ω = 500 rad/sec = 2πf.
At Resonance condition,
ωL = 1/(ωC)
L 0.2 H
Also at series resonace
1. fr = 1/[2π√(LC)]
2. PF = 1
3. Maximum current
4. Source voltage = voltage across resistor.

MGVCL Exam Paper (30-07-2021 Shift 2)
The operating time of an inverse definite minimum time (IDMT) overcurrent relay is ____ proportional to the plug-setting multiplier (PSM) and____proportional to the time-multiplier setting (TMS).

directly, inversely
directly, directly
inversely, directly
inversely, inversely

ANSWER DOWNLOAD EXAMIANS APP
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