72. When load on an over-excited or underexcited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is
74. The maximum power developed in a synchronous motor occurs at a coupling angle of
75. When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor
76. In which of the following motors the stator and rotor magnetic field rotate at the same speed?
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