Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 none.
 N1 : N2.
 1 : 1.
 N12 : N22.

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Electrical Machines
Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements

 1 and 3 are correct
 2 and 4 are correct
 1, 2 and 4 are correct
 1, 2 and 3 are correct

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