MGVCL Exam Paper (30-07-2021 Shift 3)
Consider a solar PV plant with the following specific conditions:
Analysis period: 1 year
Measured average solar irradiation intensity in 1 year: 150 kWh/m²
Generator area of the PV plant: 10 m² Efficiency factor of the PV modules: 15%
Electrical energy actually exported by plant to grid: 135 kWh
Calculate the performance ratio.

75%
60%
50%
80%

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MGVCL Exam Paper (30-07-2021 Shift 3)
In which of the following situations, there is no need to provide directional overcurrent protection.

single end fed, single feeder
ring main
double end fed, single feeder
single end fed, parallel feeder

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MGVCL Exam Paper (30-07-2021 Shift 3)
Find the current through the resistor and the capacitor for the current shown in figure The switch is closed at t = O and initial change in the capacitor is zero.

I(t) = 10(1 - e⁵⁰⁰⁰ᵗ) A
I(t) = 5(1 - e⁵⁰⁰⁰ᵗ) A
I(t) = 5e⁵⁰⁰⁰ᵗ A.
I(t) = 10e⁵⁰⁰⁰ᵗ A.

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MGVCL Exam Paper (30-07-2021 Shift 3)
The DC offset in fault current causes conventional over-current (OC) relays to :

over-reach
under-reach
sometimes under-reach and sometimes over-reach
reach remains unaffected due to DC offset

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