Fluid Mechanics Objective Questions and Answers

547. Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?

548. The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid.

A. Newtonion

549. Enamels and paints are generally __________ fluid.

550. The pressure intensity is the same in all directions at a point in a fluid

A. Only when the fluid is frictionless

B. Only when the fluid is at rest having zero velocity

C. When there is no motion of one fluid layer relative to an adjacent layer

D. Regardless of the motion of one fluid layer relative to an adjacent layer

Discussion

551. For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is

A. More

B. Less

C. Equal

D. Either A or B depends on the viscosity of the fluid

Discussion

552. Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.

A. Small differential

553. Differential manometer measures the

A. Atmospheric pressure

B. Sub-atmospheric pressure

C. Pressure difference between two points

D. None of these

Discussion

Fluid Mechanics MCQs