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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 4KVA
 20KVA
 0KVA
 16KVA

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 963.8 r.p.m.
 1130 r.p.m.
 1037.5 r.p.m.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 series motor
 permanent magnet motor
 comulatively compounded motor
 differentially compounded motor

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

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Electrical Machines
In electric locomotive which of the following motor are used ?

  DC series motor.
  Separately compound motor.
  Shunt motor.
  Synchronous motor.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 supply voltage and field current at constant excitation
 power factor and supply voltage during hunting
All of these
 power factor and dc excitation at constant load

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