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? 180 90 60 120 180 90 60 120 ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Which of the following is a reason to decouple AVR and LFC loops when there is a shortage of reactive power? AVR loop response is slower than LFC loop deference of error is the main reason angle of the voltage is not considered Change in voltage magnitude marginally affects real power AVR loop response is slower than LFC loop deference of error is the main reason angle of the voltage is not considered Change in voltage magnitude marginally affects real power ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In sub stations for making and breaking of load current circuit breakers are used isolators are used relays are used load interrupter switches are used circuit breakers are used isolators are used relays are used load interrupter switches are used ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The RMS value of the voltage u(t) = 3 + 4 cos(3t) is 5 3 + 2(1.41) 7 4.12 5 3 + 2(1.41) 7 4.12 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) In synchronous motor, V-curve is a graph of 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 Armature current Vs power factor ANSWER EXPLANATION DOWNLOAD EXAMIANS APP v curve: armature current → field currentInverted V curve: power factor → field current
GETCO Exam Paper (22-07-2015) The Y bus matrix is a sparse matrix because … no of lines are less Y primitive is a sparse matrix bus incidence matrix is a sparse matrix lines are connected to less no. of buses no of lines are less Y primitive is a sparse matrix bus incidence matrix is a sparse matrix lines are connected to less no. of buses ANSWER DOWNLOAD EXAMIANS APP
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