The current in the coil of a large electromagnet falls from 6 A to 2 A in 10 ms. The induced emf across the coil is 100 V. Find the self-inductance of the coil.

MGVCL Exam Paper (30-07-2021 Shift 3)
The current in the coil of a large electromagnet falls from 6 A to 2 A in 10 ms. The induced emf across the coil is 100 V. Find the self-inductance of the coil.

1.25 H

0.75 H

0.25 H

0.5 H

1.25 H

0.75 H

0.25 H

0.5 H

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MGVCL Exam Paper (30-07-2021 Shift 3)
Determine the ohmic value of the current limiting reactor per phase external to a 40 MVA, 15 kV, 50 Hz, three phase synchronous generator which can limit the current on short circuit of 6 times the full load current. The reactance of the synchronous generator is 0.06 pu.

0.4 Ω

0.8 Ω

0.6 Ω

0.2 Ω

0.4 Ω

0.8 Ω

0.6 Ω

0.2 Ω

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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.

double end fed, single feeder

single end fed, parallel feeder

ring main

single end fed, single feeder

double end fed, single feeder

single end fed, parallel feeder

ring main

single end fed, single feeder

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MGVCL Exam Paper (30-07-2021 Shift 3)
In a 3-phase, 4-wire, 400/230 V system, a lamp (L₁) of 100 W is connected to one phase and neutral and a lamp (L₂) of 150 W is connected to the second pahse and neutral. If the neutral wire is disconnected accidently, what will be the voltage across a 150 W lamp (L₂)?

120 v

240 V

160 V

180 V

120 v

240 V

160 V

180 V

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MGVCL Exam Paper (30-07-2021 Shift 3)
If the velocity of wind is doubled then the power output will

reduced to half

doubled

increase by 6 times

increase by 8 times

reduced to half

doubled

increase by 6 times

increase by 8 times

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MGVCL Exam Paper (30-07-2021 Shift 3)
Replace the braketed phrase grammatically and conceptually with the help of the given opation. If the given sentence is correct then select the option ’The given sentence is correct’.
The corono virus continued to spread, with the development of infections advancing quickly

continued for spread, with the development of infections

The given sentence is correct

continue to spread, with the development of infections

continued to spreading, with the development of infections

continued for spread, with the development of infections

The given sentence is correct

continue to spread, with the development of infections

continued to spreading, with the development of infections

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

MGVCL Exam Paper (30-07-2021 Shift 3) The current in the coil of a large electromagnet falls from 6 A to 2 A in 10 ms. The induced emf across the coil is 100 V. Find the self-inductance of the coil.

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

MGVCL Exam Paper (30-07-2021 Shift 3) If the velocity of wind is doubled then the power output will

MGVCL Exam Paper (30-07-2021 Shift 3)
The current in the coil of a large electromagnet falls from 6 A to 2 A in 10 ms. The induced emf across the coil is 100 V. Find the self-inductance of the coil.

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

MGVCL Exam Paper (30-07-2021 Shift 3)
If the velocity of wind is doubled then the power output will