# Practice Test: Question Set - 26

**1. When the momentum of one fluid is used for moving another fluid, such a device is called a/an**

- (A) Jet pump

- (B) Blower

- (C) Acid egg

- (D) None of these

**2. The equivalent diameter for flow through a rectangular duct of width**

*B*and height*H*is- (A)

*HB*/2 (

*H*+

*B*)

- (B)

*HB*/(

*H*+

*B*)

- (C) 2

*HB*/(

*H*+

*B*)

- (D) 4

*HB*/(

*H*+

*B*)

**3. The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is**

- (A) Parabolic

- (B) Flat

- (C) Flat near the wall and parabolic in the middle

- (D) Parabolic near the wall and flat in the middle

**4. Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the**

- (A) Temperature

- (B) Pressure

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

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

**5. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of**

- (A) Relative roughness

- (B) Absolute roughness

- (C) Friction co-efficient for flows at equal Reynold number

- (D) All (a), (b) & (c)

**6. Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter '**

*d*'?- (A) At the centre

- (B) At

*d*/4 from the wall

- (C) At the wall

- (D) At

*d*/8 from the wall

**7. At a constant speed of the centrifugal pump, it’s __________ the impeller diameter.**

- (A) Capacity varies directly with

- (B) Head varies as the square of

- (C) Horsepower varies as the cube of

- (D) All (a), (b) and (c)

**8. Upto what value of 'Mach number', a fluid may be considered as incompressible?**

- (A) 0.03

- (B) 0.3

- (C) 3

- (D) 10

**9. Foot valves provided in pumps are __________ valves.**

- (A) Relief

- (B) Three/four way

- (C) Pressure reducing

- (D) Directional control

**10. Velocity distribution for flow between two fixed parallel plates**

- (A) Varies parabolically across the section

- (B) Is constant over the entire cross-section

- (C) Is zero at the plates and increases linearly to the mid-plane

- (D) None of these

**11. Which of the following can be used for the direct measurement of volumetric flow rate of slurry?**

- (A) Venturimeter

- (B) Orificemeter

- (C) Rotameter

- (D) Pitot tube

**12. Pick out the wrong statement:**

- (A) Greater is the kinematic viscosity of the liquid, greater is the
thickness of the boundary layer

- (B) Blowers develop a maximum pressure of 2 atmospheres

- (C) Friction losses in pipe fittings are generally expressed in terms of
velocity heads

- (D) Fanning friction factor in case of turbulent flow of liquids in pipe
depends upon relative roughness & Reynolds number

**13. The dimension of dynamic viscosity is**

- (A) ML

^{-1}T

^{-1}

- (B) L

^{2}T

^{-1}

- (C) LT

^{-2}

- (D) ML

^{-1}T

^{-2}

**14. The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is**

**P. Inlet pressure**

**Q. Compressor rpm**

**R. Delivery pressure**

**S. Volumetric flow rate at inlet.**

- (A) P, Q and R

- (B) P and R

- (C) R and S

- (D) P, R and S

**15. In case of centrifugal fan or blower, the gas capacity varies as**

- (A) Speed

- (B) (Speed)

^{2}

- (C) (Speed)

^{3}

- (D) (Speed)

^{0.5}

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