On what factors the speed of dc motor depends?

Electrical Machines
On what factors the speed of dc motor depends?

Armature current Ia.

All of these.

Field flux.

Applied voltage.

Armature current Ia.

All of these.

Field flux.

Applied voltage.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

8.

4.

6.

2.

8.

4.

6.

2.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

resonance.

harmonics.

cogging.

crawling.

resonance.

harmonics.

cogging.

crawling.

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Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are

2, 4 ,5

1, 3, 5

1, 4

2, 3 , 5

2, 4 ,5

1, 3, 5

1, 4

2, 3 , 5

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

lap-wound machine will have more rated voltage and more current

wave-wound machine will have more rated current and more voltage

lap-wound machine will have more rated voltage and less current

wave-wound machine will have more rated voltage and less current

lap-wound machine will have more rated voltage and more current

wave-wound machine will have more rated current and more voltage

lap-wound machine will have more rated voltage and less current

wave-wound machine will have more rated voltage and less current

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Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

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Electrical Machines

Electrical Machines On what factors the speed of dc motor depends?

Electrical Machines The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

Electrical Machines In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

Electrical Machines If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

Electrical Machines The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines
On what factors the speed of dc motor depends?

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively