MGVCL Exam Paper (30-07-2021 Shift 3)
A single phase motor connected to 400 V, 50 Hz supply takes 25 A at a power factor of 0.75 lagging. Calculate the capacitance required in parallel with the motor to raise the power factor to 0.95 lagging.

82.55 pF
92.55 pF
62.55 pF
72.55 pF

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MGVCL Exam Paper (30-07-2021 Shift 3)
Murray loop test is performed on a faulty cable 300 m long. At balance, the resistance connected to the faulty core was set at 20 Ω and the resistance of the resistor connected to the sound core was 40 Ω. Calculate the distance of the fault point from the test end.

100 m
200 m
400 m
300 m

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MGVCL Exam Paper (30-07-2021 Shift 3)
The current flowing in to a balanced delta connected load through line 'a' is 10 A when the conductor of line ’b’ is open. With the current in line 'a' as reference, compute the symmetrical components of the line currents. Assume the phase sequence of ’abc’.

Ia₀ = 0 A.Ia₁ = (-5 + j2.88) A.Ia₂ = (5 - j2.88) A.
Ia₀ = 0 A.Ia₁ = (-1.66 + j2.88) A.Ia₂ = (1.66 + j2.88) A.
Ia₀ = 10 A.Ia₁ = (-1.66 + j2.88) A.Ia₂ = (1.66 + j2.88) A.
Ia₀ = 10 A.Ia₁ = (-5 + j2.44) A.Ia₂ = (5 - j2.44) A.

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MGVCL Exam Paper (30-07-2021 Shift 3)
In a single phase energy meter, the pressure / voltage coil is wound on

the centre limb of the laminated core / the middle limb of the shunt magnet
both the limbs of the laminated core with different turns
both the limbs of the laminated core with same turns
the edges of the limb on the laminated core

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MGVCL Exam Paper (30-07-2021 Shift 3)
If the power supplied by current source shown in figure is double of that supplied by the voltage source, then the value of 'R' is

2.5 Ω
7.5 Ω
5 Ω
3.33 Ω

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