The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines
The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

C - A - B.

A - C - B.

B - C - A or C - A - B.

B - C - A.

C - A - B.

A - C - B.

B - C - A or C - A - B.

B - C - A.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What are slot wedges in a DC machine made of?

Mild steel.

Cast iron.

Fibre.

Silicon steel.

Mild steel.

Cast iron.

Fibre.

Silicon steel.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Wave winding is employed in DC machine of

low current and high voltage rating.

high current and low voltage rating.

low current and low voltage rating.

low current and high voltage rating.

high current and low voltage rating.

low current and low voltage rating.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 ÃŽÂ©. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

25.564 ÃŽÂ©.

2.241 ÃŽÂ©.

2.74 ÃŽÂ©.

2.781 ÃŽÂ©.

25.564 ÃŽÂ©.

2.241 ÃŽÂ©.

2.74 ÃŽÂ©.

2.781 ÃŽÂ©.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

1/√5

1/3

1/√2

2/√5

1/√5

1/3

1/√2

2/√5

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%.

920 RPM

960 RPM

940 RPM

970 RPM

920 RPM

960 RPM

940 RPM

970 RPM

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines What are slot wedges in a DC machine made of?

Electrical Machines Wave winding is employed in DC machine of

Electrical Machines A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 ÃŽÂ©. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

Electrical Machines In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

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
The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines
What are slot wedges in a DC machine made of?

Electrical Machines
Wave winding is employed in DC machine of

Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 ÃŽÂ©. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

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%.