Chemical Fluid Kinematics & Fluid Dynamics Questions & Answers - Set 28 - ObjectiveBooks

Chemical Fluid Kinematics & Fluid Dynamics Questions & Answers - Set 28

Practice Test: Question Set - 28

1. In case of a __________ the energy of flow is considerably decreased downstream of the machine.
    (A) Blower
    (B) Turbine
    (C) Centrifugal pump
    (D) Centrifugal fan

2. Pick out the correct statement pertaining to the flow through a converging-diverging tube.
    (A) The value of Mach number is always unity at the throat
    (B) No shock wave develops in the tube when the Mach number at exit is greater than unity
    (C) Throughout the converging portion of the tube, the density increases in the downstream direction
    (D) None of these

3. Water hammer in a pipeline results from the
    (A) Bursting of pipelines due to closure by a valve
    (B) Rapid pressure change due to a rapid change in the rate of flow
    (C) Pressure increase due to closure of a valve resulting in decrease in rate of flow
    (D) None of these

4. Acceleration head in a reciprocating pump
    (A) Increases the work done during delivery stroke
    (B) Decreases the work done during suction stroke
    (C) Does not change the work requirement of the pump
    (D) Increases the work done during suction stroke

5. Kinetic energy of fluid per unit weight represented by the velocity head is given by
    (A) 2v2/gc
    (B) v2/2gc
    (C) ρv2/gc
    (D) ρ.v2/2gc

6. With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) Increases exponentially

7. If the discharge of a centrifugal pump is throttled, then its suction lift
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) Data insufficient to predict

8. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature).
    (A) 1/√T
    (B) 1/T
    (C) √T
    (D) T

9. With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids
    (A) Increases
    (B) Decreases
    (C) Remain same
    (D) May increase or decrease; depends on the magnitude of shear rate

10. One horsepower is equal to
    (A) 550 lbf.ft/second
    (B) 550 kgf.m/second
    (C) Both (a) and (b)
    (D) 550 lbf.ft./hr

11. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity
    (A) Same as that of A
    (B) One fourth as that of A
    (C) Twice as that of A
    (D) Four times as that of A

12. An ideal nozzle design aims at
    (A) Minimizing wall friction
    (B) Suppressing boundary layer separation
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

13. A piezometer opening measures the __________ fluid pressure.
    (A) Static
    (B) Undisturbed
    (C) Total
    (D) Dynamic

14. In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as: (where, 'δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow).
    (A) Re
    (B) √Re
    (C) 1/Re
    (D) Re -1/2

15. The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s).
    (A) 24000
    (B) 24
    (C) 0.24
    (D) 0.44

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