GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is lagging zero leading unity lagging zero leading unity 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))/VVR at lagging PF = ((I*R*cosφ)+(I*X*sinφ))/V
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? 60 90 180 120 60 90 180 120 ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) For given kVAR and line voltage the ratio of star to delta value of capacitor is 1 1.73 3 0.33333333333333 1 1.73 3 0.33333333333333 ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In a thermal power plant, heat from the flue gases is recovered in Electric precipitator chimney condenser Economizer Electric precipitator chimney condenser Economizer 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) The constraints that are to be met with while solving UC problem are Spinning reserve Minimum up time Minimum down time all are correct Spinning reserve Minimum up time Minimum down time all are correct ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS