A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

15.28 Nm

15.6 Nm

16.55 Nm

15.92 Nm

15.28 Nm

15.6 Nm

16.55 Nm

15.92 Nm

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

to reduce the insulation of materials.

in order to reduce eddy current to provide large flux.

as it carries large load current.

to provide large flux.

to reduce the insulation of materials.

in order to reduce eddy current to provide large flux.

as it carries large load current.

to provide large flux.

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Electrical Machines
Which of the following motors has low ratings only?

Resistance split phase

Capacitor run

Shaded pole

Capacitor start

Resistance split phase

Capacitor run

Shaded pole

Capacitor start

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

crawling.

locking.

plugging.

cogging.

crawling.

locking.

plugging.

cogging.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

the motor may run away.

the starting current will be enormously high.

the starting torque becomes low.

the motor may not start.

the motor may run away.

the starting current will be enormously high.

the starting torque becomes low.

the motor may not start.

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

Direct online starting.

Auto transformer starting.

Rotor resistance starting.

Stator resistance starting.

Direct online starting.

Auto transformer starting.

Rotor resistance starting.

Stator resistance starting.

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Electrical Machines

Electrical Machines A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

Electrical Machines Field winding of a DC series motor is usually provided with thick wire

Electrical Machines Which of the following motors has low ratings only?

Electrical Machines An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

Electrical Machines Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

Electrical Machines Which method is less recommendable for induction motor starting in the industries?

Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

Electrical Machines
Which of the following motors has low ratings only?

Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

Electrical Machines
Which method is less recommendable for induction motor starting in the industries?