The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

57.1%.

48.0%.

59.2%.

88.8%.

57.1%.

48.0%.

59.2%.

88.8%.

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Electrical Machines
Slip speed is the

difference of actual rotor speed and synchronous speed.

difference of synchronous speed and actual rotor speed.

half of the sum of synchronous and rotor speeds.

sum of synchronous and rotor speeds.

difference of actual rotor speed and synchronous speed.

difference of synchronous speed and actual rotor speed.

half of the sum of synchronous and rotor speeds.

sum of synchronous and rotor speeds.

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Electrical Machines
From no load to full load the slip will

not change.

slightly increase.

None of these

slightly decrease.

not change.

slightly increase.

None of these

slightly decrease.

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

eliminate noise.

balance the rotor dynamically.

none of these.

facilitate cooling of rotor.

eliminate noise.

balance the rotor dynamically.

none of these.

facilitate cooling of rotor.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

armature reaction.

permanent magnets.

residual magnetism.

None of these

armature reaction.

permanent magnets.

residual magnetism.

None of these

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

5 %.

2.67 %.

1.5 %.

30 %.

5 %.

2.67 %.

1.5 %.

30 %.

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Electrical Machines

Electrical Machines The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

Electrical Machines Slip speed is the

Electrical Machines From no load to full load the slip will

Electrical Machines The squirrel cage induction motors are provided with blades in order to

Electrical Machines The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

Electrical Machines A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

Electrical Machines
Slip speed is the

Electrical Machines
From no load to full load the slip will

Electrical Machines
The squirrel cage induction motors are provided with blades in order to

Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.