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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 increase
 either increase or decrease
None of these

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 AC single phase motor.
 DC Shunt Motor
 Induction motor.
 Synchronous motor.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

None of these
  magnetizing electric current and back emf.
  the supply voltage and the back emf.
  the rotating stator flux and rotor flux.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 double.
 half.
 4 times.
 one fourth.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 have an equal number of electrons and protons.
 Series shunt.
  Differentical compound.
 Cummulative compound.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 3
 1 and 2
 1, 2 and 3
 2 alone

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