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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.

0.25 H
1.25 H
0.5 H
0.75 H

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Equation of self inductance:
V = Ls*(di/dt)
Ls = V/(di/dt)
= 100/((6 - 2)/(0.01))
= 0.250 H
= 250 mH

MGVCL Exam Paper (30-07-2021 Shift 3)
The maximum value of power factor is ____ and it exists in a pure____ circuit.

1, inductive
1, resistive
0.866, inductive
0.866, resistive

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Value of power factor is varies from 0 to 1.
R→PF = 1
L→PF = 0 lag
C→PF = 0 lead
R-L→0 lag < PF < 1
R-C→0 lead < PF < 1
R-C-L→depends on value of R, L and C. PF = R/Z

MGVCL Exam Paper (30-07-2021 Shift 3)
The complex power injections at a bus are shown in figure Two lines connected drawing the powers as shown in figure. The complex power in the line-2 "S2" is

2-j1
2+j1
2-j5
2+j5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Total power generate (Sg) = S1 + S2
S2 = Sg - S1
= 5 + 3j - 3 + 2j
= 2 + 5j

MGVCL Exam Paper (30-07-2021 Shift 3)
Name the application under MS Office software bundle, that we use to create audio- visual presentation.

MS Access
MS Power point
MS Word
MS Excel

ANSWER DOWNLOAD EXAMIANS APP

MGVCL Exam Paper (30-07-2021 Shift 3)
વિષમ' ની સંધી છૂટી પાડો. - કયો વિકલ્પ સાચો છે?

વિ + સમ
વીસ + અમ
વિસ્ + અમ
વી + સમ

ANSWER DOWNLOAD EXAMIANS APP

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?

1.25
4.25
2.5
6.25

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

MORE MCQ ON MGVCL Exam Paper (30-07-2021 Shift 3)

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