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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  stainless steel.
  aluminium.
  cast iron.
  mild steel.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Output power at the shaft.
 Power drawn in KW.
 Power drawn in KVA.
 Gross power.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 250 rpm.
 2166.67V, 230 rpm.
 2166.67V, 270 rpm.
 541.67V, 200 rpm.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 400 A.
 440 A.
 44 A.
  40 A.

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Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
 Silicon steel.
 Mild steel.
  Fibre.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 234.76 N-m.
 133.22 N-m
 can not be determined.
 266.20 N-m.

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