A) the equivalent resistance is equal to the stand leakage impedance of the motor B) the slip is zero C) the equivalent resistance is equal to the resistance of the rotor D) the equivalent load resistance is equal to the stand still reactance of the motor. Ans : (A)
A) the stator winding is connected to supply and the rotor winding is open circuited B) both the stator and the rotor winding are connected to supply C) the stator winding is connected to supply and the rotor winding is short circuited D) the rotor winding is connected to supply and the stator winding is short circuited. Ans : (C)
A) 375 to 500 B) 500 to 720 C) 720 to 960 D) 1440 to 2880. Ans : (D)
A) assisted starting with zero torque B) self-starting with small torque as compared to rated torque C) self-starting with high torque D) self-starting with zero torque. Ans : (B)
A) presence of slip rings B) diameter of shaft C) direction of rotation D) size of frame. Ans : (A)
A) starting line current is independent of line voltage B) rotor induced emf at standstill varies as stator flux C) at standstill the power factor of rotor emf is unity D) starting torque varies as inverse of line voltage. Ans : (B)
A) infinite B) 100 C) 1.0 D) zero. Ans : (C)
A) 0.2 leading B) 0.2 lagging C) 0.8 leading D) 0.8 lagging. Ans : (D)
A) 11 kV rms, phase to phase B) 6.6 kV rms, phase to phase C) 3.3 kV rms, phase to phase D) 440 V rms, phase to phase Ans : (A)
A) 20 kW B) 100 kW C) 150 kW D) 250 kW. Ans : (D)