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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/3000.
 PN/120.
 PN/2.
 PN/60.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC compound motor.
 DC shunt motor with armature resistance.
 DC series motor.
 DC shunt motor with field weaking control.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  shunt.
  over compounded.
  under-compounded.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T is independent of P
 T∝ P²
 T∝ P³
 T∝ P

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the polar axis.
 armature in the polar axis.
 commutator in the inter polar axis.
 armature midway between poles.

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 240 V.
 150 V.
 210 V
 230 V.

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