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%.

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%.

920 RPM

970 RPM

960 RPM

940 RPM

920 RPM

970 RPM

960 RPM

940 RPM

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Transformer core is laminated to reduce

eddy current loss.

both 1 and 2.

hysteresis loss.

copper loss.

eddy current loss.

both 1 and 2.

hysteresis loss.

copper loss.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For a 3 - ÃŽÂ¦, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

1440, 1500.

60, 1440.

60, 1500.

50, 1500.

1440, 1500.

60, 1440.

60, 1500.

50, 1500.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Slot wedges in a dc machine is made up of

silicon steel.

cast iron.

fibre.

mild steel.

silicon steel.

cast iron.

fibre.

mild steel.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

0.23Ω.

0.5Ω.

0.25Ω.

1Ω.

0.23Ω.

0.5Ω.

0.25Ω.

1Ω.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

4 times.

half.

double.

one fourth.

4 times.

half.

double.

one fourth.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

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%.

Electrical Machines Transformer core is laminated to reduce

Electrical Machines For a 3 - ÃŽÂ¦, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

Electrical Machines Slot wedges in a dc machine is made up of

Electrical Machines Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

Electrical Machines Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

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%.

Electrical Machines
Transformer core is laminated to reduce

Electrical Machines
For a 3 - ÃŽÂ¦, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

Electrical Machines
Slot wedges in a dc machine is made up of

Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become