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GETCO EXAM PAPER (22-07-2015)

GETCO Exam Paper (22-07-2015)
Calculate torque developed by the 3-phase, 5 HP, 4 pole induction motor runs at 1500 rpm

10 N-m
22 N-m
0 N-m
23.5 N-m

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

P = 2πTN/60 where N is speed in rpm

GETCO Exam Paper (22-07-2015)
Which of the following breaking method save energy?

regenerative breaking
dynamic breaking
plugging
resistor breaking

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

three types of electric breaking:
Regenerative breaking( leads to economic and energy consevation)
pugging (more efficient method of breaking)
rheostatic breaking

GETCO Exam Paper (22-07-2015)
For eliminating 7th harmonics from generated EMF in alternator the fractional pitch must be

6\7
7\8
2\3
5\6

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

fractional pitch = Cos( α/2)
α is obtain from: (nα/2)=90˚ where n is harmonic
α=25.7143˚
fractional pitch=6/7

GETCO Exam Paper (22-07-2015)
A transformer has negative voltage regulation when its load PF is

lagging
unity
zero
leading

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Voltage regulation = ((no load voltage)-(full load voltage)/(no load voltage))
VR at leading PF = ((I*R*cosφ)-(I*X*sinφ))/V
VR at lagging PF = ((I*R*cosφ)+(I*X*sinφ))/V

GETCO Exam Paper (22-07-2015)
In synchronous motor, V-curve is a graph of

Armature current Vs active power
Armature current Vs reactive power
Armature current Vs Field current
Armature current Vs power factor

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

v curve: armature current → field current
Inverted V curve: power factor → field current

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