# Hydraulic Machines-Fluid Machineries – Set 11

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## Q1. The kinematic viscosity is the

(A) Ratio of absolute viscosity to the density of the liquid
(B) Ratio of density of the liquid to the absolute viscosity
(C) Product of absolute viscosity and density of the liquid
(D) Product of absolute viscosity and mass of the liquid

Answer:(A) Ratio of absolute viscosity to the density of the liquid

(A) 10 kg
(B) 100 kg
(C) 1000 kg
(D) 1 kg

(A) 2gH
(B) H × √(2g)
(C) 2g × √H
(D) √(2gh)

## Q4. A streamline is defined as the line

(A) Parallel to central axis flow
(B) Parallel to outer surface of pipe
(C) Of equal velocity in a flow
(D) Along which the pressure drop is uniform

Answer: (C) Of equal velocity in a flow

## Q5. The discharge through a siphon spillway is

(A) Cd × a × √(2gH)
(B) Cd × a × √(2g) × H3/2
(C) Cd × a × √(2g) × H2
(D) Cd × a × √(2g) × H5/2

Answer: (A) Cd × a × √(2gH)

## Q6. In a forced vortex, the velocity of flow everywhere within the fluid is

(A) Maximum
(B) Minimum
(C) Zero
(D) Nonzero finite

## Q7. Coefficient of velocity is defined as the ratio of

(A) Actual velocity of jet at vena contracta to the theoretical velocity
(B) Area of jet at vena contracta to the area of orifice
(C) Actual discharge through an orifice to the theoretical discharge
(D) None of the above

Answer: (A) Actual velocity of jet at vena contracta to the theoretical velocity

## Q8. The unit of viscosity is

(A) Meters² per sec
(B) kg-sec/meter
(C) Newton-sec per meter²
(D) Newton-sec per meter

(A) 4μvl/wd²
(B) 8μvl/wd²
(C) 16μvl/wd²
(D) 32μvl/wd²

## Q10. For manometer, a better liquid combination is one having

(A) Higher surface tension
(B) Lower surface tension
(C) Surface tension is no criterion
(D) High density and viscosity

## Q11. According to Bernoulli’s equation for steady ideal fluid flow

(A) Principle of conservation of mass holds
(B) Velocity and pressure are inversely proportional
(C) Total energy is constant throughout
(D) The energy is constant along a streamline but may vary across streamlines

Answer: (D) The energy is constant along a streamline but may vary across streamlines

## Q12. The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

(A) Half the depth
(C) Twice the depth

## Q13. The ratio of absolute viscosity to mass density is known as

(A) Specific viscosity
(B) Viscosity index
(C) Kinematic viscosity
(D) Coefficient of viscosity

## Q14. A flow through a long pipe at decreasing rate is called __ uniform flow.

(C) Both A and B
(D) None of these

## Q15. The normal stress in a fluid will be constant in all directions at a point only if

(A) It is incompressible
(B) It has uniform viscosity
(C) It has zero viscosity
(D) It is at rest

Answer: (D) It is at rest

## Q16. A thick liquid like syrup has a __ viscosity than a light liquid like water.

(A) Lesser
(B) Greater
(C) Same
(D) None of these

## Q17. The discharge over a rectangular notch is

(A) Inversely proportional to H3/2
(B) Directly proportional to H3/2
(C) Inversely proportional to H5/2
(D) Directly proportional to H5/2

Answer: (B) Directly proportional to H3/2

## Q18. Choose the correct relationship

(A) Specific gravity = gravity × density
(B) Dynamic viscosity = kinematic viscosity × density
(C) Gravity = specific gravity × density
(D) Kinematic viscosity = dynamic viscosity × density

Answer: (B) Dynamic viscosity = kinematic viscosity × density