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

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 10-pole induction motor is supplied by a 6-pole alternator, which is driven at 1400 rpm. If the motor runs with a slip of 5%, what is its speed?

882 rpm
798 rpm
1425 rpm
1575 rpm

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Slip of the induction motor,
S = (Ns - Nr)/Ns
Ns = (120*f)/P
Poles (P) = 6

1400 = (120*f)/6
f = 70 Hz
For P = 10
Ns = (120*70)/10
= 840 rpm
Nr = Ns(1 - S)
= 840*(1 - 0.05)
= 798 rpm

MGVCL Exam Paper (30-07-2021 Shift 3)
A three phase four pole 50 Hz induction motor has a rotor resistance of 0.02 Ω/phase and stand-still reactance of 0.5 Ω/phase. Calculate the speed at which the maximum torque is developed.

1525 rpm
1475 rpm
1440 rpm
1500 rpm

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Condition for maximum torque,
Sm = R2/X2
= 0.04
Ns = (120*f)/P
= (120*50)/4
= 1500 rpm
S = (Ns - Nr)/Ns
Nr = Ns(1 - Sm)
= 1500*(1 - 0.04)
= 1440 rpm

MGVCL Exam Paper (30-07-2021 Shift 3)
Message ____ means that the data must arrive at the receiver exactly as sent.

Authentication
Integrity
None ot these
Confidentiality

ANSWER DOWNLOAD EXAMIANS APP

MGVCL Exam Paper (30-07-2021 Shift 3)
As per Stockholm International Peace Research Institute (SIPRI) report 2019 for the period 2014-2018, which country is the largest arms importer in the world?

Saudi Arabia
Myanmar
Germany
India

ANSWER DOWNLOAD EXAMIANS APP

MGVCL Exam Paper (30-07-2021 Shift 3)
Job, in operating system refers to

Process
Application Software
System software
Program

ANSWER DOWNLOAD EXAMIANS APP
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