Electrical Machines If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by sf. f / s. sf / 2. s2. sf. f / s. sf / 2. s2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is 340 A. 460 A. 570 A. 250 A. 340 A. 460 A. 570 A. 250 A. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In auto transformer if the turn ratio is K, what is the power transferred inductively? K × input power (1-K) × input power both A and B None of these K × input power (1-K) × input power both A and B None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An electric motor with constant output power will have a torque speed characteristics in the form of a Straight line parallel to the speed axis. Circle about the origin. Straight line through the origin. Rectangular hyperbola Straight line parallel to the speed axis. Circle about the origin. Straight line through the origin. Rectangular hyperbola ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The condition for maximum running torque is 0.5 lagging R = S.X unity zero 0.707 lagging 0.5 lagging R = S.X unity zero 0.707 lagging ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The use of double squirrel cage winding on the rotor provides higher efficiency. reduced starting torque. low noise. a large starting torque. higher efficiency. reduced starting torque. low noise. a large starting torque. ANSWER DOWNLOAD EXAMIANS APP
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