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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 either GNA or MNA
 MNA
None of these
 GNA

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may run away.
 the starting current will be enormously high.
 the starting torque becomes low.
 the motor may not start.

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4SP²
 PZL/4Sa²
 PZL/ 4Sa
 PZL/4S

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 60W
 80W
 100W
 40W

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 150 Ω.
 225 Ω.
 145 Ω.
  375 Ω.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  remains constant.
  decreases.
 increases.
  increases upto a limit and then remains almost constant.

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