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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 Cos α²
 sin (α/2)
 Cos α

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra maximum and Rf maximum
 Ra minimum and Rf minimum
 Ra maximum and Rf minimum

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Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Capacitor run
 Capacitor start
 Shaded pole

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 no load
 full load
 any of the above

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 173 A.
 127 A.
 240 A.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.4
 0.02
 0.04
 0.2

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