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Electrical Machines
Sparkless commutation can be achieved by employing
inter poles.
high resistance carbon brushes.
compensating winding.
any one or more of the above methods.
inter poles.
high resistance carbon brushes.
compensating winding.
any one or more of the above methods.
Answer
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Related Question
Electrical Machines
The crawling in the induction motor is caused by
low voltage supply
harmonics developed in the motor
improper design of stator laminations
high loads
low voltage supply
harmonics developed in the motor
improper design of stator laminations
high loads
Answer
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Electrical Machines
The armature reaction mmf in a DC machines has a form of
triangular.
trapezoidal.
sinusoidal.
rectangular.
triangular.
trapezoidal.
sinusoidal.
rectangular.
Answer
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Electrical Machines
With the increase in speed of a DC motor
both back emf as well as line current fall.
back emf falls and line current increases.
back emf increases but line current falls.
both back emf as well as line current increase.
both back emf as well as line current fall.
back emf falls and line current increases.
back emf increases but line current falls.
both back emf as well as line current increase.
Answer
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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as
these are cheaper in cost, simple and rugged in construction.
they are capable of operation under range of leading and lagging pf.
they have very good speed regulation.
they have maximum efficiency and maximum starting torque.
these are cheaper in cost, simple and rugged in construction.
they are capable of operation under range of leading and lagging pf.
they have very good speed regulation.
they have maximum efficiency and maximum starting torque.
Answer
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Electrical Machines
In most condition which frame of motor will be preferred?
Splash proof.
Open type.
Totally enclosed fan coiled.
Drip proof.
Splash proof.
Open type.
Totally enclosed fan coiled.
Drip proof.
Answer
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