What is the slope of concrete floor drain and the dimension of them

That depends upon if the floor drain will be installed in a residence or a commercial setting. The slope would be less in your bathroom and more in a factory. Here's what Concrete Construction had to say about it.

We could find no reference to recommended slopes when trench drains are used in a floor. The recommended slope for flat roofs is usually 1% (1/8 inch per foot) or 2% (1/4 inch per foot) according to The Professional Handbook of Building Construction, published by John Wiley & Sons, New York.

A 2% slope will probably ensure better drainage.We could also find no slope tolerance for use when a floor slope is specified. ACI 117-90, Standard Specifications for Tolerances for Concrete Construction and Materials, gives a level alignment tolerance of 3/4 inch for top-of-slab elevation of slabs on grade. If the slab elevation at the trench drain is within 3/4 inch of the plan elevation, and the slab top elevation farthest from the drain is also within 3/4 inch of plan elevation, the slab would meet ACI 117 tolerances. This tolerance is useless, however, as a means for ensuring floor drainage. Son slope is what you plan on using the floor drain for, Good luck, Tom