GETCO Exam Paper (22-07-2015) In differential protection scheme, a stabilizing resistance connected to increase the current limit reduce the effect of non identical CTs block harmonics increase the relay sensitivity increase the current limit reduce the effect of non identical CTs block harmonics increase the relay sensitivity ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In rotating electrical machines, the insulation temperature limit for class B type is 150˚C 130˚C 105˚C 180˚C 150˚C 130˚C 105˚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? plugging dynamic breaking resistor breaking regenerative breaking plugging dynamic breaking resistor breaking regenerative breaking 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) 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 5 7 4.12 3 + 2(1.41) 5 7 4.12 3 + 2(1.41) 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) Current chopping phenomenon is related to resistance switching small inductive current asymmetrical current capacitance switching resistance switching small inductive current asymmetrical current capacitance switching ANSWER DOWNLOAD EXAMIANS APP
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