A) the machine will vibrate violently B) the machine is said to be floating C) the machine is working as synchronous generator D) the machine is working as synchronous motor. Ans : (B)
A) zero B) undefined C) moderate D) high. Ans : (A)
A) 4024 B) 2012 C) 10006 D) 503. Ans : (C)
A) Winding friction B) Frequency C) Supply voltage D) Load. Ans : (A)
A) not start B) burn out C) start and run as induction motor D) start as induction motor and run as synchronous motor. Ans : (D)
A) zero B) between 0o and 90o C) between 90o and 180o D) more than 180o. Ans : (D)
A) Interlocking action between stator and rotor fields B) Magnetization of rotor not poles by stator magnetic field C) Lenz’s law D) Faraday’s law of electro-magnetic induction. Ans : (A)
A) inphase with the applied voltage B) leading the applied voltage by 90o C) lagging the applied voltage by 90o D) zero. Ans : (B)
A) field excitation increases B) harmonics are developed C) negative phase sequence currents come into action D) damper bars develop induction generator torque. Ans : (D)
A) supply voltage and field current at constant excitation B) field current and power factor at constant load C) power factor and supply voltage during hunting D) supply voltage and excitation current at constant load. Ans : (B)