Electrical Machines The armature MMF waveform of a DC machine is pulsating. triangular. sinusoidal. rectangular. pulsating. triangular. sinusoidal. rectangular. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines It is advisable to start a DC series motor with some load to Limit the flux. Limit the speed. Limit the current. Avoid sparking. Limit the flux. Limit the speed. Limit the current. Avoid sparking. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The efficiency of a transformer is mainly dependent on copper losses. core losses. stray losses. dielectric losses. copper losses. core losses. stray losses. dielectric losses. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines How can the synchronous speed of a 3 - Φ IM be varied? By varying the supply frequency. By varying number of poles. Both (A) and (B). By varying supply voltage. By varying the supply frequency. By varying number of poles. Both (A) and (B). By varying supply voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of rotating magnetic field of 8 pole 50 Hz induction motor is 1500 rpm 1000 rpm 3000 rpm 750 rpm 1500 rpm 1000 rpm 3000 rpm 750 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the excitation is critical, the power factor of the alternator is leading power factor. lagging power factor. unity power factor. None of these leading power factor. lagging power factor. unity power factor. None of these ANSWER DOWNLOAD EXAMIANS APP
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