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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 100 Ω
 50 Ω
 10 Ω

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL/NfL.
 NnL − NfL.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be 12.5%
 be more than 10%
 remain unchanged
 be less than 10%

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Auto transformer starting.
  Stator resistance starting.
  Rotor resistance starting.
  Direct online starting.

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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?

 40W
 60W
 80W
 100W

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.9 Ω
 15.1 Ω
 31.9 Ω
 31.1 Ω

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