Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

 2 and 4.
  1, 2 and 3.
 1, 3 and 4.
 2, 3 and 4.

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

 Field winding resistance should be less than critical resistance.
 Poles should contain residual flux.
 Field winding should be properly connected to armature winding.
All of these

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Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?

 The speed will increase gradually.
 The speed will remains almost constant.
 The speed will increase abruptly.
 The speed will increase in proportion to reduction in load.

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