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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

 Armature current Ia.
 Applied voltage.
 All of these.
 Field flux.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 1000 rpm
 950 rpm
 940 rpm

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Any of above.
 Armature voltage control.
 Field resistance control.
 Armature circuit resistance control.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 10°
 60°
 45°

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  none of above.
 demagnetising.
  magnetising.
  crossmagnetising.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1037.5 r.p.m.
 none of above.
 1130 r.p.m.
 4575.4 r.p.m.

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