What is the difference between rotational equilibrium and translational equilibrium?

Ans : When a rigid body has a constant linear acceleration or momentum at any given point of time, then it is in translational equilibrium. In this case, the vector sum of the linear force is zero; the total force acting on the body is zero. 

When a rigid body has a constant angular momentum or acceleration at a given time, and the vector sum of torques is zero, then the body is said to be in rotational equilibrium.