EE MCQ

MGVCL Exam Paper (30-07-2021 Shift 1)
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An eight-pole wave-connected armature has 600 conductors and is driven at 625 rev/min. If the flux per pole is 20 mWb, determine the generated emf.

Let,

E→EMF in volt

φ→Flux in weber

A→Parallel path (for wave winding = 2)

Z→No. of armature conductors

N→speed in rpm

P = Number of poles

E = PφNZ/(60A)

E = 8*0.020*625/(60*2)

E = 500 V

Related Question

MGVCL Exam Paper (30-07-2021 Shift 1)
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The power factor angle of a purely inductive circuit is

Power factor for purely inductive circuit is 0 and power factor angle is 90 degree.

Power factor for purely capacitive circuit is 0 and power factor angle is 90 degree

Power factor for purely resistive circuit is 1 and power factor angle is 0 degree

MGVCL Exam Paper (30-07-2021 Shift 1)
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The operating time of an inverse definite minimum time (IDMT) overcurrent relay corresponding to plug-setting multiplier (PSM) = 1 and time-multiplier setting (TMS) = 1 will be

Equation of operating time for IDMT relay (t) = 0.14*TMS/[(PSM^0.02) - 1]

Here,

PSM = TMS = 1

So,

t = 0.14*1/(1 - 1)

t = infinite