Only a DC motor uses direct current, and the reason is that it is the only supply available.
There are also plenty of AC motors used when there is an AC supply.
DC tends to be used for low-power devices like fans in electronic equipment.
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Depends on the design. Electric motors can be made to run on alternating current as well.
Electric motors can be made to use either direct or alternating current. Many small home motors use direct current for safety.
I've not heard the term "bressless" - I think you mean "Brushless" - which is a DC Motor that does not use the usual commutator/brush arrangement. For a great answer to this question, see the Wikipedia article in the related links section.
DC Motor works on DC source and AC motor works on AC source
It depends on the motor. The fan is driven by an electric motor, and it can use a dc motor (as in a car) or an ac motor (as in a house). They are not interchangeable.
dc motors generate more noise.
Found one DC motor having small sparking,but the commutator is light and dark bar pattern.commutator is round. We 500kw dC motor operted at 500rpm with 480Amp's .The DC motor full load current is 1050Amp's. Why the commutator had small spaerking.