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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 Nr
 S.Ns
 Ns

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
 armature circuit resistance control
 supply voltage control
All of these

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta.
  star.
None of these
  delta or star according to need.

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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 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 Ω
 6 Ω
 1.9 Ω
 2.2 Ω

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
None of these
 DC series motors.
 DC shunt motors.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K²
 R1 /K
 K×R1
 K²R1

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