# Practice Test: Question Set - 18

**1. A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is __________ kg.**

- (A) 10

- (B) 100

- (C) 1000

- (D) 10000

**2.**

*f*= 16/*N*, is valid for_{Re}- (A) Turbulent flow

- (B) Laminar flow through an open channel

- (C) Steady flow

- (D) None of these

**3. Power number is the ratio of**

- (A) Drag stress to inertial stress

- (B) Inertial stress to drag stress

- (C) Inertial stress to gravitational stress

- (D) Gravitational stress to drag stress

**4. Which law is followed by the velocity distribution in the turbulent boundary layer?**

- (A) Parabolic law

- (B) Linear law

- (C) Logarithmic law

- (D) None of these

**5. A centrifugal pump has the following specifications:**

**Power = 4 H.P.; Speed = 800 rpm**

**Head = 8 meters**

**Flow = 1000 liters/minutes.**

**If its speed is halved, the power consumed now will be __________ hp.**

- (A) 0.5

- (B) 2

- (C) 4

- (D) 1

**6. In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where,**

*V*= average fluid velocity)_{avg}- (A)

*V*

_{avg}- (B) 1.2

*V*

_{avg}- (C) 1.5

*V*

_{avg}- (D) 1.8

*V*

_{avg}**7. A Newtonian fluid is that**

- (A) Which follows Newton's law of motion

- (B) Which needs a minimum shear, before it starts deforming

- (C) For which shear & deformation are related as

*T*=

*ยต*(∂

*u*/∂

*y*)

- (D) None of these

**8. Unsteady non-uniform flow is represented by flow through a/an**

- (A) Long pipe at constant rate

- (B) Long pipe at decreasing rate

- (C) Expanding tube at increasing rate

- (D) Expanding tube at constant rate

**9. Bernoulli's equation accounts for the**

- (A) Various momentums

- (B) Various masses

- (C) Different forms of mechanical energy

- (D) None of these

**10. Slugging occurs in a fluidized bed, if the bed is**

- (A) Narrow

- (B) Deep

- (C) Both (a) & (b)

- (D) Neither (a) nor (b)

**11. The line of action of the buoyant force acts through the**

- (A) Centroid of the displaced volume of fluid

- (B) Centre of gravity of a submerged body

- (C) Centroid of the volume of any floating body

- (D) None of these

**12. The curve of metacentre for a floating body __________ the curve of buoyancy.**

- (A) Is always below

- (B) Is the evolute of

- (C) Intersects at right angle

- (D) Is tangential to

**13. Pressure drop in a packed bed for laminar flow is given by the __________ equation.**

- (A) Kozeny-Carman

- (B) Blake-Plummer

- (C) Leva's

- (D) Fanning friction factor

**14. What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?**

- (A) 0.5

- (B) 1

- (C) 1.5

- (D) 2

**15. For an incompressible fluid, the bulk modulus of elasticity is**

- (A) 5 kg/m

^{3}

- (B) ∞ N/m

^{2}

- (C) 1 N

- (D) 0 N/m

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