GETCO Exam Paper (22-07-2015) In rotating electrical machines, the insulation temperature limit for class B type is 105˚C 130˚C 150˚C 180˚C 105˚C 130˚C 150˚C 180˚C ANSWER EXPLANATION DOWNLOAD EXAMIANS APP insulation Class and temperature limit(in ˚C) is given below:Y - 90A- 105E- 120B-130F-155H-180C- above 180
GETCO Exam Paper (22-07-2015) Which of the following breaking method save energy? regenerative breaking resistor breaking dynamic breaking plugging regenerative breaking resistor breaking dynamic breaking plugging ANSWER EXPLANATION DOWNLOAD EXAMIANS APP three types of electric breaking:Regenerative breaking( leads to economic and energy consevation)pugging (more efficient method of breaking)rheostatic breaking
GETCO Exam Paper (22-07-2015) For a given transformer volte/turn for primary and secondary winding is depends on transformer design same depends on load different depends on transformer design same depends on load different ANSWER EXPLANATION DOWNLOAD EXAMIANS APP emf = 4.44*f*φ*Temf/T = 4.44*f*φ
GETCO Exam Paper (22-07-2015) What is the surge impedance loading of 400 kV line with surge impedance given as 160 Ω 1000 MW 1000 kW 250 MW 400 MW 1000 MW 1000 kW 250 MW 400 MW ANSWER EXPLANATION DOWNLOAD EXAMIANS APP SIL = (kV)²/Z₀
GETCO Exam Paper (22-07-2015) Select the wrong statement from the following in relation to power flow analysis No of ittretion in N R method can not be more than 30 for any system jacobian is always required Approximation is used in FDLF method Y Bus is required for power flow analysis No of ittretion in N R method can not be more than 30 for any system jacobian is always required Approximation is used in FDLF method Y Bus is required for power flow analysis ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Slip at maximum torque depends on rotor resistance and reactance stator reactance load current stator resistance rotor resistance and reactance stator reactance load current stator resistance ANSWER EXPLANATION DOWNLOAD EXAMIANS APP at maximum torque:S=R₂/X₂
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