Question
Download Solution PDFWhich statement is correct for DC machine comparative to AC machine?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 2.
The DC motor is 30% more efficient than AC motors due to the magnetic field generated from the permanent magnets rather than copper windings.
Difference between DC and AC machine
|
Parameter |
AC Machine |
DC Machine |
|
Definition |
An AC motor can be defined as an electric motor that is driven by an alternating current (AC). |
A DC motor is a rotatory electric motor that converts Direct current (DC energy) into mechanical energy. |
|
Maintenance |
Less due to the non-availability of a commutator and brush assembly |
High due presence of commutator and brush assembly |
|
Speed control |
Frequency control, Pole changing, Rotor resistance |
Field Flux method, Armature resistance method, Voltage control |
|
Efficiency |
Low efficiency |
High efficiency |
Last updated on May 9, 2025
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