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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 increases.
 decreases
 remains constant.
 decreases.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce eddy current loss.
  to provide better flux linkage.
  to reduce hysteresis loss.
  to reduce mechanical losses.

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as synchronous reactances Xs
 inversely as 1/Xs
 directly as Xs2
All of these

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Electrical Machines
If the field circuit of a DC shunt motor is opened

  The motor will attain dangerously high speed.
 DC Shunt Motor
 The speed of motor will be reduced.
 The armature current will reduce.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 ohms.
 5.7 ohms.
 1.9 ohms.
 2.2 ohms.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 4*ωm
 ωe = ωm
 ωe = 1/2*ωm
 ωe = 2*ωm

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