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MGVCL Exam Paper (30-07-2021 Shift 2)
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Consider a solar PV plant with the following specific conditions: Analysis period: 1 year

Measured average solar irradiation intensity in 1 year: 120 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: 110 kWh

Calculate the performance ratio.

Measured average solar irradiation intensity in 1 year: 120 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: 110 kWh

Calculate the performance ratio.

The irradiation values measured on location yields an average solar irradiation for the entire analysis period of 120 kWh/m².

This irradiation value is extrapolated to the modular area of the PV plant as follows:

Irradiation value in kWh/m² x plant area in m² = 120 kWh/m² x 10 m² = 1,200 kWh

In order to subsequently calculate the nominal plant output, the irradiation value for the PV plant is multiplied by the modular efficiency:

1,200 kWh x 15 % = 1,200 kWh x 0.15 = 180 kWh

PR = 110 kWh/180 kWh = 0.61112 = 61.11 %

MGVCL Exam Paper (30-07-2021 Shift 2)
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Which one of the following statement is TRUE?

In the cables, the location of fault is usually found out by comparing the capacitances of insulated conductors.

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

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)
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In a single phase energy meter, the shunt electromagnet is energized by a ____of ____

In single phase energy meter,

Current coil is made up from thick wire having few no. of turns.

Pressure coil is made up from thin wire having more no. of turns.

MGVCL Exam Paper (30-07-2021 Shift 2)
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In the circuit of figure, the switch is closed to position-1 for a long time. At t = 0 the switch position is changed from postion-1 to postion-2. Find an expression for the current i(t).

Standard eqution of current for this condition,

i(t) = i(0+)*cos(wt)

i(0+) = E/R

For LC circuit,

w = 1/√(LC)

i(t) = (E/R)*cos((1/√(LC))*t) A