A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α σ
A. σ cos α 4 wd
B. 4 wd σ cos α
C. wd 4 σ cos α
D. 4 σ cos α wd
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The viscosity of water is __________ than that of mercury.
A. Higher
B. Lower
C. Same as
D. None of these
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The surface tension of mercury at normal temperature compared to that of water is
A. More
B. Less
C. Same
D. More or less depending on size of glass tube
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The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
A. Slow speed with radial flow at outlet
B. Medium speed with radial flow at outlet
C. High speed with radial flow at outlet
D. High speed with axial flow at outlet
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The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if
A. The area is horizontal
B. The area is vertical
C. The area is inclined
D. All of the above
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In a centrifugal pump casing, the flow of water leaving the impeller, is
A. Rectilinear flow
B. Radial flow
C. Free vortex motion
D. Forced vortex
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A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
A. One-half
B. One-third
C. Two-third
D. Three-fourth
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Operation of McLeod gauge used for low pressure measurement is based on the principle of
A. Gas law
B. Boyle's law
C. Charle's law
D. Pascal's law
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The flow ratio of Francis turbine is defined as the ratio of the
A. Velocity of flow at inlet to the theoretical jet velocity
B. Theoretical velocity of jet to the velocity of flow at inlet
C. Velocity of runner at inlet to the velocity of flow at inlet
D. None of the above
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The jet ratio is defined as the ratio of the
A. Diameter of jet to the diameter of Pelton wheel
B. Velocity of jet to the velocity of Pelton wheel
C. Diameter of Pelton wheel to the diameter of jet
D. Velocity of Pelton wheel to the velocity of jet
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The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is
A. Slow speed with radial flow at outlet
B. Medium speed with radial flow at outlet
C. High speed with radial flow at outlet
D. High speed with mixed flow at outlet
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Which of the following pump is successfully used for lifting water to the turbines?
A. Centrifugal pump
B. Reciprocating pump
C. Jet pump
D. Air lift pump
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Which of the following statement is correct as regard to water wheels?
A. They have slow speeds
B. They are suitable even for low water heads
C. They give constant efficiency, even if the discharge is not constant
D. All of the above
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The kinematic viscosity is the
A. Ratio of absolute viscosity to the density of the liquid
B. Ratio of density of the liquid to the absolute viscosity
C. Product of absolute viscosity and density of the liquid
D. Product of absolute viscosity and mass of the liquid
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The viscosity of water at 20°C is
A. One stoke
B. One centistoke
C. One poise
D. One centipoise
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A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is
A. 12 b d 2 + x
B. 12 x d 2 + x
C. 12 b 2 + x
D. 12 d 2 + x
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The sheet of water flowing over a notch or a weir is known as
A. Sill or crest
B. Nappe or vein
C. Orifice
D. None of these
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When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
A. Narrow-crested weir
B. Broad-crested weir
C. Ogee weir
D. Submerged weir
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The pressure in Pascal’s at a depth of 1 m below the free surface of a body of water will be equal to
A. 1 Pa
B. 91 Pa
C. 981 Pa
D. 9810 Pa
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The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is
A. Directly proportional to (radius)2
B. Inversely proportional to (radius)2
C. Directly proportional to (radius)4
D. Inversely proportional to (radius)4
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