In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

remains constant at all speeds
is minimum at zero speed and increases monotonically with increase in speed
is maximum at zero speed and decreases monotonically with increase in speed
becomes minimum at an
✅ The correct answer is option D.

The flow in a pipe or channel is said to be non-uniform when

the liquid particles at all sections have the same velocities
the liquid particles at different sections have different velocities
the quantity of liquid flowing per second is constant
each liquid particle h
✅ The correct answer is option B.