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MGVCL Exam Paper (30-07-2021 Shift 3)

MGVCL Exam Paper (30-07-2021 Shift 3)
The magnetizing inrush current in a transformer is rich in the harmonic component.

fifth
third
seventh
second

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

2nd harmonics contains - 60 to 55 %
3rd harmonics contains - 40 - 50%

MGVCL Exam Paper (30-07-2021 Shift 3)
A 200/400 V, 20 kVA, 2-winding transformer is connected as an auto-transformer to transform 600 V to 200 V. Calculate the kVA rating of the auto-transformer.

30 kVA
60 kVA
50 kVA
25 kVA

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Here auto transformer change voltage from 600 V to 200 V.
Voltage ratio (a) = 600/200 = 3
kVA rating of the auto-transformer = (a/(a - 1))*(kVA rating of auto transformer)
= (3/2)*20
= 30 kVA

MGVCL Exam Paper (30-07-2021 Shift 3)
If the phase velocity of a plane wave in a perfect dielectric is 0.4 times its value in free space, then what is the relative permittivity of the dielectric?

2.5
4.25
6.25
1.25

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The equation is given by:
Vp (Phase velocity) = (Velocity of light in free space/Phase velocity)²
= (1/0.4)²
= 6.25

MGVCL Exam Paper (30-07-2021 Shift 3)
A single phase full converter bridge, connected to 230 V, 50 Hz source is feeding a load R =10 Ω in series with a large inductance that makes the load current ripple free. For a firing angle of 450, calculate the rectification efficiency.

63.66%
28.33%
76.66%
50.55%

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Rectification efficiency = DC output power/AC input power

MGVCL Exam Paper (30-07-2021 Shift 3)
Which country leads in the production of biofuel in the world?

Brazil
Germany
Argentina
United States of America

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Rank - Country - Production (thousands barrel)
1 - US - 940
2 - Brazil - 449
3 - Germany - 68
4 - China - 68

MGVCL Exam Paper (30-07-2021 Shift 3)
Fill in the blanks with suitable Preposition from the given alternatives.
BCCI receives____1000 applications for Team India head coach position

since
against
for
over

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