Chemical Fluid Mechanics Problems with Solutions - Set 37 - ObjectiveBooks
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# 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 cm2/sec is moving at critical flow condition (NRe = 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, CD-log NRe, 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) V1 < V2 < V3
(B) V2 > V1 and V2 > V3
(C) V1 > V2 > V3
(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 Δp. 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) Δp
(B) 2Δp
(C) Δp2
(D) Δp/2

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