Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

B is bigger than A for the same current rating

A is bigger than B for the same current rating

A is bigger than B for the same voltage rating

both are of the same size for the same current rating

B is bigger than A for the same current rating

A is bigger than B for the same current rating

A is bigger than B for the same voltage rating

both are of the same size for the same current rating

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Electrical Machines
In shapers and slotters which motor are preferred?

Double cage motor.

Slip ring IM.

Synchronous motor.

Squirrel cage IM.

Double cage motor.

Slip ring IM.

Synchronous motor.

Squirrel cage IM.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

(3/2)Fmax.

Fmax.

(1/2)Fmax.

3Fmax.

(3/2)Fmax.

Fmax.

(1/2)Fmax.

3Fmax.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

both B and C

shunt generator

series generators

over compound generator

both B and C

shunt generator

series generators

over compound generator

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Electrical Machines
For an ideal transformer the winding should have

minimum resistance on primary side and maximum resistance on secondary side

no ohmic resistance on either side

equal resistance on primary and secondary side

maximum resistance on primary side and least resistance on secondary side

minimum resistance on primary side and maximum resistance on secondary side

no ohmic resistance on either side

equal resistance on primary and secondary side

maximum resistance on primary side and least resistance on secondary side

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

541.67V, 250 rpm.

2166.67V, 230 rpm.

541.67V, 200 rpm.

2166.67V, 270 rpm.

541.67V, 250 rpm.

2166.67V, 230 rpm.

541.67V, 200 rpm.

2166.67V, 270 rpm.

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Electrical Machines

Electrical Machines Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines In shapers and slotters which motor are preferred?

Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

Electrical Machines In which of the following generators negative voltage regulation can occur?

Electrical Machines For an ideal transformer the winding should have

Electrical Machines An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines
In shapers and slotters which motor are preferred?

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

Electrical Machines
In which of the following generators negative voltage regulation can occur?

Electrical Machines
For an ideal transformer the winding should have

Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?