GETCO Exam Paper (22-07-2015) Light from the nearest star (other than the sun) reaches the earth in 42 secs 4.2 minutes 4.2 years 4.2 hours 42 secs 4.2 minutes 4.2 years 4.2 hours ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is leading lagging zero unity leading lagging zero 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) Slip at maximum torque depends on rotor resistance and reactance stator resistance load current stator reactance rotor resistance and reactance stator resistance load current stator reactance ANSWER EXPLANATION DOWNLOAD EXAMIANS APP at maximum torque:S=R₂/X₂
GETCO Exam Paper (22-07-2015) Which of the following is not function of substation batteries? operating protective relay systems provide supply to the excitation system operating automatic control circuits emergency lighting circuits operating protective relay systems provide supply to the excitation system operating automatic control circuits emergency lighting circuits ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In sub stations for making and breaking of load current isolators are used circuit breakers are used load interrupter switches are used relays are used isolators are used circuit breakers are used load interrupter switches are used relays are used ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The Y bus matrix is a sparse matrix because … 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 no of lines are less ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS