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Electrical Machines

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

 400 A.
 44 A.
 440 A.
 40 A.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 eddy-current loss
 mechanical loss
 hysteresis loss

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Ia(ra + rs)
 Vt= Ea– Iara
 Vt= Ea + Iara
 Vt = Ea + Iara+ ILrs

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

 about 100 V.
  zero.
  250 V.
  very small, say about 2 or 3 V.

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 230 V.
 240 V.
 210 V
 150 V.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = P/2*ωm
 ωe = 2/P*ωm
 ωe = P*ωm

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