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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
All of these
 zero
 maximum

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Both torque and speed decrease.
  Torque increase and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

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

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
 rotor reactance X
 both 1 and 2
None of these

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Electrical Machines
Armature reaction in DC generators will result in

 increase in slip.
 open circuit.
 short circuit.
 reduction in generated emf.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1-S
 1/S
 S
 2-S

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