The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

remain the same

become zero

increase

decrease

remain the same

become zero

increase

decrease

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

460 V

230 V

115 V

65 V

460 V

230 V

115 V

65 V

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Electrical Machines
The rotor speed of an induction motor is given by

Nr = 120f / p Ãƒâ€” (1-s).

Ns = 120f / p Ãƒâ€” ( 1 - s ).

Ns = 120f /p Ãƒâ€” ( 1 - r).

None of these

Nr = 120f / p Ãƒâ€” (1-s).

Ns = 120f / p Ãƒâ€” ( 1 - s ).

Ns = 120f /p Ãƒâ€” ( 1 - r).

None of these

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Electrical Machines
Which of the following motor has negative speed regulation?

Cumulative compound motors

Series motor

Shunt motor

Differential compound motor

Cumulative compound motors

Series motor

Shunt motor

Differential compound motor

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

T∝ P³

T∝ P²

T is independent of P

T∝ P

T∝ P³

T∝ P²

T is independent of P

T∝ P

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

less heating of the rotor.

negative sequence current.

less heating of the rotor.

all of these.

less heating of the rotor.

negative sequence current.

less heating of the rotor.

all of these.

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Electrical Machines

Electrical Machines The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

Electrical Machines The rotor speed of an induction motor is given by

Electrical Machines Which of the following motor has negative speed regulation?

Electrical Machines In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

Electrical Machines Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

Electrical Machines
The rotor speed of an induction motor is given by

Electrical Machines
Which of the following motor has negative speed regulation?

Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause