Electrical Machines When maximum starting torque is obtained, rotor power is ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%. 940 RPM 960 RPM 970 RPM 920 RPM 940 RPM 960 RPM 970 RPM 920 RPM ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Swinburne test is conducted under which of the following condition? half load no load full load any of the above half load no load full load any of the above ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines With the increase in speed of DC motor Both back emf as well as line current increase. Both back emf as well as line current fall. Back emf increase but line current falls. Back emf falls and line current increase. Both back emf as well as line current increase. Both back emf as well as line current fall. Back emf increase but line current falls. Back emf falls and line current increase. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In which of the following DC Motor the ratio of starting torque to full load torque is minimum? Differential compound motor. Series motor. Cumulative compound motor. Shunt motor. Differential compound motor. Series motor. Cumulative compound motor. Shunt motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Damper winding is used to both 1 and 2. decrease the load current. increase the load current. suppress the hunting. both 1 and 2. decrease the load current. increase the load current. suppress the hunting. ANSWER DOWNLOAD EXAMIANS APP
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