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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 50 ohm.
 100 ohm.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 75 rpm
 3000 rpm
 1500 rpm
 375 rpm

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Electrical Machines
Torque developed in the rotor is

 either of these
 directly proportional to slip
 not dependent on the slip
 inversely proportional to slip

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 2*ωm
 ωe = 4*ωm
 ωe = 1/2*ωm
 ωe = ωm

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 74
 72
 37
 36

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Electrical Machines
Which of the following alternators contain large number of poles?

 Turbo alternators.
 Aame in both alternators.
 Hydro alternators.
None of these

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