# Hydraulic Machines-Fluid Machineries – Set 05

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## Q1. An ideal flow of any fluid must fulfill the following

(A) Newton’s law of motion
(B) Newton’s law of viscosity
(C) Pascal’ law
(D) Continuity equation

## Q2. An internal mouthpiece is said to be running free if the length of the mouthpiece is __ the diameter of the orifice.

(A) Less than twice
(B) More than twice
(C) Less than three times
(D) More than three times

Answer: (C) Less than three times

(A) wA
(B) wx
(C) wAx
(D) wA/x

## Q5. Choose the wrong statement

(A) Fluids are capable of flowing
(B) Fluids conform to the shape of the containing vessels
(C) When in equilibrium, fluids cannot sustain tangential forces
(D) When in equilibrium, fluids can sustain shear forces

Answer: (D) When in equilibrium, fluids can sustain shear forces

## Q6. The pressure of the liquid flowing through the divergent portion of a Venturimeter

(A) Remains constant
(B) Increases
(C) Decreases
(D) Depends upon mass of liquid

## Q7. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

(A) Higher than the surface of liquid
(B) The same as the surface of liquid
(C) Lower than the surface of liquid
(D) Unpredictable

Answer: (C) Lower than the surface of liquid

## Q8. When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of

(A) A triangle
(B) A paraboloid
(C) An ellipse
(D) None of these

## Q9. If the surface of liquid is convex, men

(A) Cohesion pressure is negligible
(B) Cohesion pressure is decreased
(C) Cohesion pressure is increased
(D) There is no cohesion pressure

## Q11. Center of pressure compared to e.g. is

(A) Above it
(B) Below it
(C) At same point
(D) Above or below depending on area of body

## Q12. The two important forces for a floating body are

(A) Buoyancy, gravity
(B) Buoyancy, pressure
(C) Buoyancy, inertial
(D) Inertial, gravity

(A) N-m/s2
(B) N-s/m2
(C) Poise
(D) Stoke

## Q14. Unit of surface tension is

(A) Energy/unit area
(B) Velocity/unit area
(C) Both of the above
(D) It has no units

## Q15. The critical depth meter is used to measure

(A) Velocity of flow in an open channel
(B) Depth of flow in an open channel
(C) Hydraulic jump
(D) Depth of channel

## Q16. The center of pressure of a surface subjected to fluid pressure is the point

(A) On the surface at which resultant pressure acts
(B) On the surface at which gravitational force acts
(C) At which all hydraulic forces meet
(D) Similar to metacentre

Answer: (A) On the surface at which resultant pressure acts

(A) 2,100
(B) 2,700
(C) 10,000
(D) 21,000

## Q18. The flow in a pipe or channel is said to be uniform when

(A) The liquid particles at all sections have the same velocities
(B) The liquid particles at different sections have different velocities
(C) The quantity of liquid flowing per second is constant
(D) Each liquid particle has a definite path

Answer: (A) The liquid particles at all sections have the same velocities

## Q19. An ideal flow of any fluid must satisfy

(A) Pascal law
(B) Newton’s law of viscosity
(C) Boundary layer theory
(D) Continuity equation