GETCO Exam Paper (22-07-2015) The line current in a three phase unbalanced load are Ir= 4+j6, Ib= 2-j2 and Ic= -3+j2, then zero sequence component of current will be 1 + j2 3 - j6 3 + j6 9 + j10 1 + j2 3 - j6 3 + j6 9 + j10 ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Switching surges are short duration transient voltage high voltage Acs power frequency voltage high votage DCs short duration transient voltage high voltage Acs power frequency voltage high votage DCs ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The RMS value of the voltage u(t) = 3 + 4 cos(3t) is 3 + 2(1.41) 4.12 5 7 3 + 2(1.41) 4.12 5 7 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 fault occurring in transmission actually are mostly L-L-G L-L L-G L-L-L L-L-G L-L L-G L-L-L ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is unity leading zero lagging unity leading zero lagging 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) In sub stations for making and breaking of load current isolators are used load interrupter switches are used circuit breakers are used relays are used isolators are used load interrupter switches are used circuit breakers are used relays are used ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS