DGVCL Exam Paper (11-12-2011) Permittivity is expressed in terms of Weber /m Farad/m farad/sq. m. N/m Weber /m Farad/m farad/sq. m. N/m 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 80 % 90 % Less than 90% More than 90% 80 % 90 % Less than 90% More than 90% 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) If the excitation of a synchronous generator fails, it acts as a Synchronous motor Synchronous generator Induction motor Induction generator Synchronous motor Synchronous generator Induction motor Induction generator ANSWER EXPLANATION DOWNLOAD EXAMIANS APP if excitation of synchronous generator fails, operate as induction motor
DGVCL Exam Paper (11-12-2011) In which of the following motors, the stator and rotor magnetic fields rotate at the same speed? Induction motor Universal motor Reluctance motor Synchronous motor Induction motor Universal motor Reluctance motor Synchronous 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) A fuse wire should have Low specific resistance and high melting point Low specific resistance and low melting point High specific resistance and high melting point High specific resistance and low melting point Low specific resistance and high melting point Low specific resistance and low melting point High specific resistance and high melting point High specific resistance and low melting point ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Two parallel conductors are carrying the current in the same direction. Which of the following statements is correct? The force increases when the distance between the conductors is increased There is an attracting force between the conductors The force increases when the distance between the conductors is decreased There is a repelling force between the conductors The force increases when the distance between the conductors is increased There is an attracting force between the conductors The force increases when the distance between the conductors is decreased There is a repelling force between the conductors ANSWER DOWNLOAD EXAMIANS APP
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