Fluid Mechanics
Net positive suction head (NPSH) of a centrifugal pump must be

Less than barometric pressure
Equal to the vapour pressure of the liquid
Less than the vapour pressure of the liquid
Greater than the vapour pressure of the liquid

ANSWER DOWNLOAD EXAMIANS APP

Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Varies parabolically across the cross-section
Is zero at the centre and varies linearly with the radius
Is zero at the wall and increases linearly to the centre
Remains constant over the cross-section

ANSWER DOWNLOAD EXAMIANS APP