Electrical Machines The armature MMF waveform of a DC machine is sinusoidal. triangular. rectangular. pulsating. sinusoidal. triangular. rectangular. pulsating. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines No load test on induction motor is conducted to find which of the following losses? Stator core loss Rotational loss Stator copper loss All of these Stator core loss Rotational loss Stator copper loss All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Synchronising power of a synchronous motor varies directly as Xs2 All of these directly as synchronous reactances Xs inversely as 1/Xs directly as Xs2 All of these directly as synchronous reactances Xs inversely as 1/Xs ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines As compared to DOL starting, a cage induction motor with star-delta starting shall have smoother acceleration. more starting torque. more starting time. reduced starting current. smoother acceleration. more starting torque. more starting time. reduced starting current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The change in speed of a DC generator due to increased load is corrected by increasing armature resistance. increasing armature cooling. increasing terminal voltage. increasing input power of the prime mover. increasing armature resistance. increasing armature cooling. increasing terminal voltage. increasing input power of the prime mover. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed regulation of a DC motor is given as (NnL − NfL)/NfL. (NfL − NnL)/NnL. NnL − NfL. NnL/NfL. (NnL − NfL)/NfL. (NfL − NnL)/NnL. NnL − NfL. NnL/NfL. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS