A) dc series motor B) dc shunt motor C) synchronous motor D) none of the above. Ans : (B)
A) 1500 rpm B) 900 rpm C) 750 rpm D) 375 rpm. Ans : (C)
A) Stator-rotor starter B) Star-delta starter C) Direct-on-line starter D) Any of the above. Ans : (A)
A) The starting torque and current both reduce B) The starting torque and current both increase C) The starting current reduces but starting torque increase D) None of the above. Ans : (C)
A) will run at lower rpm B) will run at higher rpm C) may run with fluctuation in speed and torque D) may burn. Ans : (D)
A) leakage reactance is reduced B) winding is stiffer C) axial length of the machine is reduced D) all of the above. Ans : (D)
A) rotor resistance equals rotor reactance B) rotor resistance is twice the rotor reactance C) rotor resistance is 1/2 the rotor reactance. Ans : (A)
A) 0.5 B) 0.707 C) 1 D) None. Ans : (B)
A) 5 kW B) 10 kW C) 50 kW D) 100 kW. Ans : (D)
A) 60% B) 90% C) 80% D) 70% Ans : (C)