Question

why celling fan rotate anticlockwise table fan rotate clockwise direction
please answer me..

Answer 1

table fan is for giving air and other 1 work as exhaust... and all of that depend on the shape of fan..

Answer 2

The favorable direction of rotation depends on the shape of it's blades.

Note that none among these (ceiling fan, table fan, exhaust fan) possess a plane of symmetry. (why?)

Answer 3

This is mainly because of the diversity in their working principles. Every fan needs a motor that allows rotational motion. Taking into consideration the structure of a motor, there are two major parts - The motor itself and the armature. Out of these two parts, one part is always stationary while the other moves around it's axis allowing rotation of any object that is attached to it. Ceiling fans have a stationary armature and the motor moves in the counter-clockwise direction. Since, the blades of the fan are attached to the motor, the ceiling fan rotates in an anti-clockwise direction. It is exactly opposite for a table fan. The motor is stationary and the armature moves to give motion to the fan blades. Because of Newton's 3rd law of motion that states - "Every action has an equal and opposite reaction.", the stationary motor gives the armature a push in the opposite direction. This causes the blades of the table fan that are attached to the armature, to move in clockwise direction

Answer 4

I would dispute the initial statement. - in fact I state that it is wrong.
Motors can rotate equally well in either direction, and indeed, simply fixing to the opposite end of the shaft has the same effect.

Fans or propellers can be made with either cw or acw pitch (and indeed variable pitch propellors can act in either direction from the same engine rotation)

Please have a look at the original assertion and see where it came from. If it is a simple observation of 2 fans, then it is not a true representation of the real way things are.