GETCO Exam Paper (22-07-2015) Steady state stability of a power system is improved by reducing fault clearing time by fast switching using double circuit line instead of single circuit line decreasing generator inertia reducing fault clearing time by fast switching using double circuit line instead of single circuit line decreasing generator inertia ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) 100% string efficiency means Zero potential across each disc None uniform potential distribution across each disc Equal potential across each disc One of the insulator discs shorted Zero potential across each disc None uniform potential distribution across each disc Equal potential across each disc One of the insulator discs shorted ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In synchronous motor, V-curve is a graph of Armature current Vs power factor Armature current Vs reactive power Armature current Vs Field current Armature current Vs active power Armature current Vs power factor Armature current Vs reactive power Armature current Vs Field current Armature current Vs active power ANSWER EXPLANATION DOWNLOAD EXAMIANS APP v curve: armature current → field currentInverted V curve: power factor → field current
GETCO Exam Paper (22-07-2015) The magnitude of sum of two sinusoidal AC voltages is equal to the magnitude of each individual voltage, What must be the phase difference between voltages? 90 60 180 120 90 60 180 120 ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The RMS value of the voltage u(t) = 3 + 4 cos(3t) is 7 4.12 3 + 2(1.41) 5 7 4.12 3 + 2(1.41) 5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP if voltage is given by,v(t) = V₀ + V₁ cos(3t) + V₂ cos(5t)+ …RMS value is given by,√( V₀² + (V₁/√2)² + (V₂/√2)² + …)
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
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