A) the motor will require less magnetizing current B) the power factor will increase C) leakage reactance will decrease D) more ampere-turns will be needed to produce same flux density in the airgap. Ans : (D)
A) in two phase will reduce to zero B) in two phase will increase to compensate for the dead phase C) will not change. Ans : (B)
A) halved B) unchanged C) doubled D) reduced to one fourth value. Ans : (A)
A) increasing the stator resistance B) reducing the rotor resistance C) increasing the rotor resistance D) increasing the rotor reactance. Ans : (C)
A) 8 % B) 7.5 % C) 4 % D) 3.3 %. Ans : (D)
A) 60 Hz B) 50 Hz C) 40 Hz D) 36 Hz. Ans : (A)
A) maintenance cost is to be kept low B) initial cost is the main consideration C) higher starting torque is the main consideration D) all above considerations are involved. Ans : (C)
A) variable speed operation is desired B) external voltage are to be fed into rotor C) high starting torque is the main consideration D) cost is the main consideration. Ans : (D)
A) cogging B) crawling C) plugging D) locking. Ans : (B)
A) magnetizing current is decreased B) leakage reactance are decreased C) leakage reactance are increased D) no load current is decreased. Ans : (C)