Synchronous Motors As the load is applied to a synchronous motor, the motor takes more armature current because The rotor strengthens the rotating field causing more motor current The back e.m.f. decreases causing an increase in motor current The rotor by shifting its phase backward causes motor to take more current The increased load has to take more current The rotor strengthens the rotating field causing more motor current The back e.m.f. decreases causing an increase in motor current The rotor by shifting its phase backward causes motor to take more current The increased load has to take more current ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have lagging power factor with over-excitation no change of power factor leading power factor with under-excitation leading power factor with over-excitation lagging power factor with over-excitation no change of power factor leading power factor with under-excitation leading power factor with over-excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Slip rings in a synchronous motor carry Direct current No current Alternating current All of the listed here Direct current No current Alternating current All of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor will always stop when Excitation winding gets disconnected Supply voltage frequency changes Load in motor varies Supply voltage fluctuates Excitation winding gets disconnected Supply voltage frequency changes Load in motor varies Supply voltage fluctuates ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The construction of a synchronous motor resembles a series motor an alternator an induction motor a rotary converter a series motor an alternator an induction motor a rotary converter ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous machine with low value of short-circuit ratio has lower stability limit good speed regulation good voltage regulation high stability limit lower stability limit good speed regulation good voltage regulation high stability limit ANSWER DOWNLOAD EXAMIANS APP
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