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MGVCL Exam Paper (30-07-2021 Shift 2)

MGVCL Exam Paper (30-07-2021 Shift 2)
Tree Topology

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MGVCL Exam Paper (30-07-2021 Shift 2)
A circuit breaker is rated 2500 A, 2000 MVA, 33 kV, 3 sec, 3-phase oil circuit breaker. Determine the breaking current.

25 kA
350 kA
2500 A
35 kA

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Breaking capacity of circuit breaker = √3*VL*Ib
VL - line voltage in volt
IL - Line current/breaking in ampere
VL = 33 kV
S = 2000 MVA

Ib = 30*1000 (in kVA)/(√3*33)
Ib = 34.99 kA

MGVCL Exam Paper (30-07-2021 Shift 2)
If the velocity of electromagnetic wave in free space is 3 × 10⁸ m/s, then the velocity in a medium with εr of 4.5 and μr of 2 would be

27 × 10⁸ m/s
3 × 10⁸ m/s
1 × 10⁸ m/s
9 × 10⁸ m/s

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Speed of EM wave in medium = C/√(εr*μr)
= (300000000)/√9
= 300000000/3
= 100000000
= 1*10⁸ m/s

MGVCL Exam Paper (30-07-2021 Shift 2)
A THHN conductor will have a 60˚C termination on one end and a 75˚C termination on the other, which ampacity column will be used?

60˚C column
None of these
90˚C column
75˚C column

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Conductor with higher temperature ratings, provide the ampacity is determined based on the 60°C ampacity of the conductor.

MGVCL Exam Paper (30-07-2021 Shift 2)
Choose the word which expresses nearly the opposite meaning of the given word "WHIMSICAL"

Funny
Regular
Fantastic
Curious

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MGVCL Exam Paper (30-07-2021 Shift 2)
Fill in the blanks with suitable Preposition from the given alternatives.
England skipper Joe Root is excited to bat ____ number three in the Ashes cricket series

over
on
in
at

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