# Practice Test: Question Set - 37

**1. Reciprocating pumps compared to centrifugal pumps**

- (A) Deliver liquid at uniform pressure

- (B) Can handle slurries more efficiently

- (C) Are not subject to air binding

- (D) Can be operated with delivery valve closed

**2. The discharge co-efficient for an orifice meter does not depend upon the**

- (A) Pipe length

- (B) Ratio of pipe diameter to orifice diameter

- (C) Type of orifice & the Reynolds number

- (D) Pipe diameter

**3. A fluid (**

*µ*/*ρ*) = 0.01 cm^{2}/sec is moving at critical flow condition (N_{Re}= 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec.- (A) 7

- (B) 700

- (C) 7000

- (D) 630

**4. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary**

- (A) Directly as square of gas density

- (B) Directly as gas density

- (C) Directly as square root of gas density

- (D) Inversely as gas density

**5. For the free settling of a spherical particle through a fluid, the slope of, C**

_{D}-log N_{Re}, plot is- (A) 1

- (B) -1

- (C) 0.5

- (D) -0.5

**6.**

**For flow through a venturi at a particular discharge, the correct relationships among velocities at point**

*X*,*Y*and*Z*would be- (A)

*V*

_{1}<

*V*

_{2}<

*V*

_{3}

- (B)

*V*

_{2}>

*V*

_{1}and

*V*

_{2}>

*V*

_{3}

- (C)

*V*

_{1}>

*V*

_{2}>

*V*

_{3}

- (D) None of these

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

- (A) The vacuum pressure is always the negative gauge pressure

- (B) The pressure of the liquid measured by a
piezometer tube is the gauge pressure

- (C) Manometric liquid should have high surface tension

- (D) The point at which the resultant pressure on an immersed surface
acts, is known as the centre of gravity

**8. The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the**

- (A) Barometric pressure

- (B) Speed of the impeller

- (C) Diameter of the impeller

- (D) Both (b) and (c)

**9. Euler's equation of motion states, that at every point, the**

- (A) Fluid momentum is constant

- (B) Force per unit mass equals acceleration

- (C) Rate of mass outflow is equal to the rate of mass inflow

- (D) None of these

**10. Hydraulic radius is the ratio of**

- (A) Wetted perimeter to flow area

- (B) Flow area to wetted perimeter

- (C) Flow area to square of wetted perimeter

- (D) Square root of flow area to wetted perimeter

**11. Steady flow occurs, when the**

- (A) Conditions change steadily with time

- (B) Conditions are the same at the adjacent points at any instant

- (C) Conditions do not change with time at any point

- (D) Rate of the velocity change is constant

**12. Cocks are used to control**

- (A) Water

- (B) Any liquid

- (C) Solids

- (D) None of these

**13. Euler's equation of motion is a statement expressing**

- (A) Conservation of mass

- (B) Conservation of energy

- (C) Newton's first law of motion

- (D) Newton's second law of motion

**14. Experimental study of laminar fluid flow through a circular tube was conducted by**

- (A) Reynolds

- (B) Hagen and Poiseuille

- (C) Pascal

- (D) Blake-Plummer

**15. The pressure drop per unit length of pipe incurred by a fluid '**

*X'*flowing through pipe is Δ*p*. If another fluid '*Y'*having both the specific gravity & density just double of that of fluid '*X'*, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be- (A) Δ

*p*

- (B) 2Δ

*p*

- (C) Δ

*p*

^{2}

- (D) Δ

*p*/2

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