Electrical Machines Variation in speed by ward-Leonard control of DC motors occurs due to variation in Supply voltage. Armature current. Armature voltage. Field excitaion. Supply voltage. Armature current. Armature voltage. Field excitaion. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The change in speed of a DC generator due to increased load is corrected by increasing input power of the prime mover. increasing armature cooling. increasing armature resistance. increasing terminal voltage. increasing input power of the prime mover. increasing armature cooling. increasing armature resistance. increasing terminal voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An inverted V-curve of synchronous motor shows the variation of power factor and dc excitation at constant load All of these supply voltage and field current at constant excitation power factor and supply voltage during hunting power factor and dc excitation at constant load All of these supply voltage and field current at constant excitation power factor and supply voltage during hunting ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________. remains same. decreased. kept constant to certain value. increased. remains same. decreased. kept constant to certain value. increased. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as air gap. crawling. relative speed. cogging. air gap. crawling. relative speed. cogging. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machine shape of armature MMF wave is? Saddle shape. Triangular and directed towards brush axis. Peaky in nature. Triangular and directed towards main pole. Saddle shape. Triangular and directed towards brush axis. Peaky in nature. Triangular and directed towards main pole. ANSWER DOWNLOAD EXAMIANS APP