1) When the velocity at a point becomes zero, it refers to ___________ a. slip condition b. no slip condition c. positive slip condition d. negative slip condition
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2) Density is ratio of __________ a. mass to volume b. volume to mass c. mass to pressure d. pressure to volume
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3) The units of viscosity are __________ a. N/m b. Ns/m2 c. m/s d. Dimension less quantity
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4) A combination of uniform flow and doublet flow gives ______________ a. flow past a circular cylinder b. flow past a wedge c. flow past a plate d. flow over any body
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5) The stream function can be obtained by _______ a. sum of stream function of uniform flow and doublet flow b. difference of stream function of uniform flow and doublet flow c. sum of stream function of uniform flow and source flow d. sum of stream function of uniform flow and sink flow
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6) The flow past cylinder is also called as _________ a. Vortex flow b. Source flow c. Rankine oval of equal axes d. Newton’s ring
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7) The shape of Rankine oval of equal axes can be found out by substituting ______________ a. Ψ=0 b. Ψ=1 c. U=0 d. U=1
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8) What will be the shape of Rankine oval when sin θ=0? a. vertical line b. horizontal line c. a point d. curve
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9) What will be the shape of Rankine oval when U*y+ ((-u/2*pi*r) = 0? a. open curve b. closed body profile c. straight line d. point
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10) The amount of lift generated in the flow over a cylinder is __________ a. Infinity b. Positive lift c. Negative lift d. No lift
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11) In real life, zero drag is acceptable. a. True b. False
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12) The free vortex flow forms _________ a. straight lines b. concentric circles c. parabola d. hyperbola
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13) Except at the origin where r=0, the vortex flow is ___________ a. rotational b. laminar c. irrotational d. turbulent
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14) The strength of the vortex flow can be given by ______________ a. Γ=2*pi*C b. Γ=2*pi c. Γ=-2*pi*C d. Γ=0
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15) The combination of uniform flow and source flow gives ___________ a. flow past a cylinder b. flow past a half body c. flow past a full body d. flow past a wedge
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16) The circles with their centre on the X axis _____________ a. eccentric circles b. concentric circles c. potential lines d. equal circles
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17) Centre of pressure can be calculated using __________ a. Principle of moments b. Principle of energy c. Mass conservation d. Rayleigh’s principle
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18) A body floats on the surface when ____________ a. metacenter is above gravity b. metacenter is below gravity c. metacenter is equal to gravity d. gravity is above metacenter
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19) Why the circular cylinder will create more drag? a. The pressure difference between upstream and downstream direction of flow b. The pressure difference between relative wind and downstream direction of flow c. The pressure difference between upstream and direction of flow d. The pressure difference between downstream of flow
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20) How the cylinder will vibrate in the wind tunnel test? a. Due to high pressure b. Due to low pressure c. Due to relative pressure d. Due to fluctuations in the flow
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