# Practice Test: Question Set - 07

**1. Pick out the Blake-Plummer equation (valid for large N**

_{Re}) for fluid flow through beds of solids.- (A) ∆p/

*ρ*= 4

*f*(

*L*/

*D*) (

*V*

^{2}/2

*g*)

_{c}- (B)

*f*

_{P}= [150 (1 - ε)/N

_{Re}] + 1.75

- (C) (-∆

*p*.

*g*.

_{c}*D*

_{ P}

^{ 2}.ε

^{3})/(

*L*.

*V̅*

_{0}.

*µ*(1 - ε)

^{2}) = 150

- (D) (-∆

*p*/

*δ*.

*L*) (

*g*/

_{c}*V̅*

_{0}

^{2}) (

*D*.ε

_{P}^{3}/(1 - ε)) = 1.75

**2. I.D. of 1/4" schedule 40 pipe is 0.364". I.D. of a 1/2" schedule 40 pipe would be __________ inch**

- (A) 4.728

- (B) 0.5

- (C) 0.622

- (D) 0.474

**3. Which of the following is most prone to pulsating discharge flow?**

- (A) Centrifugal pump

- (B) Reciprocating pump

- (C) Gear pump

- (D) Axial flow pump

**4. With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field)**

- (A) Decreases

- (B) Increases linearly

- (C) Increases exponentially

- (D) Remain constant

**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 new discharge will be __________ liters/minute.**

- (A) 500

- (B) 200

- (C) 1000

- (D) 750

**6. Pressure drop for turbulent fluid flow through a circular pipe is given by**

- (A) 64/

*R*

_{e}- (B) 32

*µLV*/

*g*.

_{c}*D*

^{2}

- (C) 4

*f*(

*L*/

*D*) (

*v*

^{2}/2

*g*).

_{c}*ρ*

- (D)

*f*(

*L*/

*D*) (

*v*

^{2}/2

*g*).

_{c}*ρ*

**7. Discharge in laminar flow through a pipe varies**

- (A) As the square of the radius

- (B) Inversely as the pressure drop

- (C) Inversely as the viscosity

- (D) As the square of the diameter

**8. An isentropic process is the one, in which**

- (A)

*pv*= constant

- (B)

*pv*

*= constant*

^{r}- (C)

*pv*

^{r}= constant, and process is reversible

- (D) None of these

**9. Self-priming centrifugal pump can be used for**

- (A) Booster service

- (B) Pumping liquid fertilizer's (e.g. liquid NH

_{3})

- (C) Pumping industrial wastes

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

**10. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is**

- (A) 5

- (B) 14.1

- (C) 56.22

- (D) 28.2

**11. In deriving Bernoulli's equation, fluid is assumed to be**

- (A) Incompressible, frictionless, steady, along a streamline

- (B) Uniform, steady, incompressible, along a streamline

- (C) Steady, density being pressure dependent, frictionless

- (D) None of these

**12. The speed of a sound wave in a gas is analogous to the speed of**

- (A) An elementary wave in an open channel

- (B) Flow in an open channel

- (C) A disturbance travelling upstream in moving
fluid

- (D) None of these

**13. Equivalent length of a pipe fitting is**

- (A) Dependent on Reynolds number

- (B) Independent of Reynolds number

- (C) Dependent on the length of the pipe

- (D) None of these

**14. Which of the following is used for very accurate measurement of flow of gas at low velocity?**

- (A) Pitot tube

- (B) Rotameter

- (C) Segmental orificemeter

- (D) Hot wire anemometer

**15. The Kozeny-Carman equation, rewritten in terms of non-dimensional numbers gives (ΔP/pu**

^{2}) proportional to- (A) (

*L*/

*D*)/

_{p}*R*

_{e}- (B)

*R*/(

_{e}*D*/

_{p}*L*)

- (C) (

*L*/

*D*)/

_{p}*R*

_{e}^{2}

- (D)

*R*

_{e}^{2}/(

*D*/

_{p}*L*)

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