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Electrical Machines
The direction of rotation of a DC motor can be determined by
Lenz's law.
Fleming's right hand rule.
Fleming's left hand rule.
Ampere's law.
Lenz's law.
Fleming's right hand rule.
Fleming's left hand rule.
Ampere's law.
Answer
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Related Question
Electrical Machines
Rotating magnetic field is produced in an induction motor because of
either stator winding or rotor winding.
stator winding.
None of these
rotor winding.
either stator winding or rotor winding.
stator winding.
None of these
rotor winding.
Answer
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Electrical Machines
Which of the following induction motor has the highest starting torque?
None of these
Same in both induction motors.
Slip ring induction motor.
Squirrel cage induction motor.
None of these
Same in both induction motors.
Slip ring induction motor.
Squirrel cage induction motor.
Answer
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Electrical Machines
The shaft of induction motor may be unbalanced due to
uneven air gap.
overload.
overheating of winding.
poor lubrication.
uneven air gap.
overload.
overheating of winding.
poor lubrication.
Answer
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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
67.5%
82.5%
72.5%
78.5%
67.5%
82.5%
72.5%
78.5%
Answer
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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?
16.67%.
18.25%.
15.30%.
14.28%.
16.67%.
18.25%.
15.30%.
14.28%.
Answer
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