DGVCL Exam Paper (11-12-2011) A Mho relay is a Directional restrained over voltage relay Directional restrained over current relay Voltage restrained directional relay Voltage controlled over current relay Directional restrained over voltage relay Directional restrained over current relay Voltage restrained directional relay Voltage controlled over current relay ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Hysteresis in an instrument means The change in the same reading when the input is first increased and then decreased The reliability of the instrument The inaccuracy due to change in temperature The repeatability of the instrument The change in the same reading when the input is first increased and then decreased The reliability of the instrument The inaccuracy due to change in temperature The repeatability of the instrument ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The positive and negative sequence impedance of a transmission line are Equal Infinite Different Zero Equal Infinite Different Zero ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The efficiency of a transformer at full load, 0.8 p.f. lag is 90%. Its efficiency at full load, 0.8 p.f. lead will be 90 % More than 90% Less than 90% 80 % 90 % More than 90% Less than 90% 80 % ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Efficiency= output power/input powerefficiency = (v*i*cosφ)/((v*i*cosφ)+(x² Pc)+(Pi)) x=fractional part of full load
DGVCL Exam Paper (11-12-2011) In which of the following motors, the stator and rotor magnetic fields rotate at the same speed? Universal motor Induction motor Synchronous motor Reluctance motor Universal motor Induction motor Synchronous motor Reluctance motor ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In all machine stator and rotor magnetic field rotates (stationary with respect to each other) at synchronous speed with respect to stationary observer.
DGVCL Exam Paper (11-12-2011) If a 5 A fuse is blown frequently in a house lighting circuit, it is required to Insert a fuse of higher voltage rating Check the load Reduce the load Insert a fuse of higher current rating Insert a fuse of higher voltage rating Check the load Reduce the load Insert a fuse of higher current rating ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS