# Hydraulics and Fluid Mechanics MCQ – Set 19

Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.

## Q1. Working principle of dead weight pressure gauge tester is based on

(A) Pascal’s law
(B) Dalton’s law of partial pressure
(C) Newton’s law of viscosity

## Q2. Reynold’s number is the ratio of the inertia force to the

(A) Surface tension force
(B) Viscous force
(C) Gravity force
(D) Elastic force

(A) Crest
(B) Nappy
(C) Sill
(D) Weir top

## Q4. If the depth of water in an open channel is greater than the critical depth, the flow is called

(A) Critical flow
(B) Turbulent flow
(C) Tranquil flow
(D) Torrential flow

## Q5. In an internal mouthpiece, the absolute pressure head at vena contracta is __ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

(A) Less than
(B) More than
(C) Equal to
(D) None of these

(B) Streamline
(C) Turbulent

## Q7. A point, in a compressible flow where the velocity of fluid is zero, is called

(A) Critical point
(B) Vena contracta
(C) Stagnation point
(D) None of these

## Q8. According to equation of continuity,

(A) w1a1 = w2a2
(B) w1v1 = w2v2
(C) a1v1 = a2v2
(D) a1/v1 = a2/v2

## Q9. The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __ of the total supply head.

(A) One-half
(B) One-third
(C) Two-third
(D) None of these

## Q10. The product of mass and acceleration of flowing liquid is called

(A) Inertia force
(B) Viscous force
(C) Gravity force
(D) Pressure force

## Q11. The body will float if the force of buoyancy is __ the weight of the liquid displaced.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

## Q12. The process of diffusion of one liquid into the other through a semi permeable membrane is called

(A) Viscosity
(B) Osmosis
(C) Surface tension
(D) Cohesion

## Q13. Choose the wrong statement

(A) Any weight, floating or immersed in a liquid, is acted upon by a buoyant force
(B) Buoyant force is equal to the weight of the liquid displaced
(C) The point through which buoyant force acts, is called the center of buoyancy
(D) Center of buoyancy is located above the center of gravity of the displaced liquid

Answer: (D) Center of buoyancy is located above the center of gravity of the displaced liquid

## Q14. The atmospheric pressure at sea level is

(A) 103 kN/m2
(B) 10.3 m of water
(C) 760 mm of mercury
(D) All of these

## Q15. Rotameter is a device used to measure

(A) Absolute pressure
(B) Velocity of fluid
(C) Flow
(D) Rotation

(A) 4.1 sec
(B) 5.2 sec
(C) 10.4 sec
(D) 14.1 sec

(A) 1
(B) 5
(C) 7
(D) 6

(A) 100 liters
(B) 250 liters
(C) 500 liters
(D) 1000 liters

## Q19. When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

(B) Turbulent flow
(C) Vortex flow
(D) Uniform flow