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%.

970 RPM

920 RPM

940 RPM

960 RPM

970 RPM

920 RPM

940 RPM

960 RPM

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which of following motor is preferred for belt conveyor?

Reluctance motor.

Synchronous motors.

Universal motor.

Slip ring induction motor.

Reluctance motor.

Synchronous motors.

Universal motor.

Slip ring induction motor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

unshaded, shaded

shaded, unshaded

shaded, shaded

unshaded, unshaded

unshaded, shaded

shaded, unshaded

shaded, shaded

unshaded, unshaded

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

1 and 2

1 and 3

2 alone

1, 2 and 3

1 and 2

1 and 3

2 alone

1, 2 and 3

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Slip speed is the

half of the sum of synchronous and rotor speeds.

difference of actual rotor speed and synchronous speed.

difference of synchronous speed and actual rotor speed.

sum of synchronous and rotor speeds.

half of the sum of synchronous and rotor speeds.

difference of actual rotor speed and synchronous speed.

difference of synchronous speed and actual rotor speed.

sum of synchronous and rotor speeds.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

0.5Kw

1.5KW

2KW

3KW

0.5Kw

1.5KW

2KW

3KW

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 Which of following motor is preferred for belt conveyor?

Electrical Machines In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

Electrical Machines Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines Slip speed is the

Electrical Machines In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

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
Which of following motor is preferred for belt conveyor?

Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines
Slip speed is the

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?