GETCO Exam Paper (22-07-2015) In synchronous motor, V-curve is a graph of Armature current Vs Field current Armature current Vs power factor Armature current Vs active power Armature current Vs reactive power Armature current Vs Field current Armature current Vs power factor Armature current Vs active power Armature current Vs reactive power ANSWER EXPLANATION DOWNLOAD EXAMIANS APP v curve: armature current → field currentInverted V curve: power factor → field current
GETCO Exam Paper (22-07-2015) Merz-Price protection is employed for protection of alternators transmission lines motor circuit breaker alternators transmission lines motor circuit breaker ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Which of the following award was not awarded to late Dr. Abdul Kalam? Padma Bhusan Bharat Ratna Padma Vibhushan Veer Chakra Padma Bhusan Bharat Ratna Padma Vibhushan Veer Chakra ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Which of the following breaking method save energy? resistor breaking dynamic breaking regenerative breaking plugging resistor breaking dynamic breaking regenerative breaking plugging 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) Calculate torque developed by the 3-phase, 5 HP, 4 pole induction motor runs at 1500 rpm 23.5 N-m 10 N-m 0 N-m 22 N-m 23.5 N-m 10 N-m 0 N-m 22 N-m ANSWER EXPLANATION DOWNLOAD EXAMIANS APP P = 2πTN/60 where N is speed in rpm
GETCO Exam Paper (22-07-2015) For eliminating 7th harmonics from generated EMF in alternator the fractional pitch must be 7\8 5\6 2\3 6\7 7\8 5\6 2\3 6\7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP fractional pitch = Cos( α/2)α is obtain from: (nα/2)=90˚ where n is harmonicα=25.7143˚fractional pitch=6/7
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