The shear stress-strain graph for a Newtonian fluid is a
A. Straight line
B. Parabolic curve
C. Hyperbolic curve
D. Elliptical
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The velocity at which the laminar flow stops, is known as
A. Velocity of approach
B. Lower critical velocity
C. Higher critical velocity
D. None of these
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Property of a fluid by which its own molecules are attracted is called
A. Adhesion
B. Cohesion
C. Viscosity
D. Compressibility
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A fluid whose viscosity does not change with the rate of deformation or shear strain is known as
A. Real fluid
B. Ideal fluid
C. Newtonian fluid
D. Non-Newtonian fluid
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The property of a fluid which enables it to resist tensile stress is known as
A. Compressibility
B. Surface tension
C. Cohesion
D. Adhesion
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The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.
A. Plus
B. Minus
C. Divide
D. None of these
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An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch.
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Axial flow pump is started with its delivery valve
A. Kept fully closed
B. Kept fully open
C. Irrespective of any position
D. Kept 50% open
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Centrifugal pump is started with its delivery valve
A. Kept fully closed
B. Kept fully open
C. Irrespective of any position
D. Kept 50% open
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In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle θ . Sensitivity of inclined tube to sensitivity of U-tube is equal to
A. sin θ
B. sin θ 1
C. cos θ
D. cos θ 1
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The unit speed of the turbine runner is
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The speed of a turbine runner is
A. Directly proportional to H 2 1
B. Inversely proportional to H 2 1
C. Directly proportional to H 2 3
D. Inversely proportional to H 2 3
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The shear stress between the two liquid layers is __________ proportional to the distance between two layers.
A. Directly
B. Inversely
C. Both A and B
D. None of these
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According to fan laws, at constant pressure, the speed capacity and power vary
A. Directly as the air or gas density
B. Inversely as square root of density
C. Inversely as density
D. As square of density
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The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3 , a = Cross-sectional area of jet in m2 and V = Velocity of jet in m/s)
A. 2 g waV
B. g waV
C. 2 g wa V 2
D. g wa V 2
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When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.
A. Less than
B. More than
C. Equal to
D. None of these
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For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal
A. Ratio of inertial force to force due to viscosity
B. Ratio of inertial force to force due to gravitation
C. Ratio of inertial force to force due to surface tension
D. All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
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Low specific speed of a pump implies it is
A. Centrifugal pump
B. Mixed flow pump
C. Axial flow pump
D. None of the above
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Medium specific speed of a pump implies it is
A. Centrifugal pump
B. Mixed flow pump
C. Axial flow pump
D. Any one of the above
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High specific speed of a pump implies it is
A. Centrifugal pump
B. Mixed flow pump
C. Axial flow pump
D. Any one of the above
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