DGVCL Exam Paper (11-12-2011) If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is 251.5 MW 217.8 MW 435.6 MW 500 MW 251.5 MW 217.8 MW 435.6 MW 500 MW ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) If a relay fails to operate inspite of a fault in its own zone of protection, it is said to Under reach Over reach Pick up Reach Under reach Over reach Pick up Reach ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) A 3 phase, 6 pole induction motor operates on 440 V, 50 Hz, supply. If the actual speed of the motor is 960 rpm the slip will be 6 % 4 % 5 % 0.4 % 6 % 4 % 5 % 0.4 % ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Ns = 120f/PSlip=(Ns-Nr)/NsNs = 1000 and Nr = 960 from equation of slip, S = (1000-960)/1000S = 0.04 or 4%
DGVCL Exam Paper (11-12-2011) The positive and negative sequence impedance of a transmission line are Zero Infinite Different Equal Zero Infinite Different Equal ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The purpose of interpoles in DC machines is to nullify Both the cross-magnetizing mmf and the reactance voltage The reactance voltage The cross-magnetizing effect of armature mmf The demagnetizing effect of armature mmf Both the cross-magnetizing mmf and the reactance voltage The reactance voltage The cross-magnetizing effect of armature mmf The demagnetizing effect of armature mmf ANSWER EXPLANATION DOWNLOAD EXAMIANS APP interpoles is widely use to improve commutationplace between main poles fitted to yokefunctions:to neutralize armature mmf in commutating zoneto produce some flux in commutating zone
DGVCL Exam Paper (11-12-2011) Which lightning stroke is most dangerous? Direct stoke on tower top Direct stroke on ground wire Indirect stroke on conductor Direct stroke on line conductor Direct stoke on tower top Direct stroke on ground wire Indirect stroke on conductor Direct stroke on line conductor ANSWER DOWNLOAD EXAMIANS APP
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