Electrical Machines A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is 96 V 768 V 384 V 192 V 96 V 768 V 384 V 192 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A large series motor is never started without some mechanical on it because otherwise it will Draw too much current. Develop excessive speed and damage itself. Open fuse or circuit breaker. Produce sparking at brushes. Draw too much current. Develop excessive speed and damage itself. Open fuse or circuit breaker. Produce sparking at brushes. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to 420 V. 350 V. 480 V. 400 V. 420 V. 350 V. 480 V. 400 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If we increase the rotor reactance value, the maximum torque will not changed None of these increase decrease not changed None of these increase decrease ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC compound motor the field regulator is provided to demagnetize the field partially. control the field flux. limit the armature current. control the armature flux. demagnetize the field partially. control the field flux. limit the armature current. control the armature flux. 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 920 RPM 970 RPM 960 RPM 940 RPM 920 RPM 970 RPM 960 RPM ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS