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Electrical Machines

Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 1500 rpm
 4000 rpm
 3000 rpm

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Increases.
 Remain unchanged
 None of above.
 Decreases.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 3.1 Ω
 1.8 9 Ω
 2 .1 Ω
 1.79 Ω

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 1.5KW
 3KW
 0.5Kw

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

  0.23Ω.
 0.25Ω.
 0.5Ω.
 1Ω.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant V, Tst increases
None of these
 constant supply voltage V, starting torque Tst decreases
 either of these

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