Question 21 : For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is
1. Froude number
2. Weber number
3. Reynold number
4. Mach number.
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Question 22 : A jet projected at an angle of 45θ, 40 m from the foot of a vertical column, just reaches the top of the column. The height of the column is
1. 10 m
2. 15 m
3. 12 m
4. 40 m
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Question 23 : Atmospheric pressure varies with
1. none of these.
2. weather conditions
3. altitude
4. temperature
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Question 24 : To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than
1. 6.4 m
2. 2.4 m
3. 10.0 m
4. 5.0 m
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Question 25 : An error of 1% in measuring the head of water over the crest of a triangular notch, produces an error in the discharge which is equal to
1. 1.50%
2. 2.0%.
3. 2.50%
4. 1.25%
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Question 26 : From a nozzle exposed to atmosphere, the liquid jet traverses
1. an elliptical path
2. a circular path
3. a parabolic path.
4. a straight line
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Question 27 : To avoid the force of surface tension in an inclined manometer, the minimum angle of inclination is
1. 4°
2. 3°
3. 2°
4. 6°
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Question 28 : In fluids, steady flow occurs when
1. conditions of flow change steadily with time
2. conditions of flow do not change with time at a point
3. conditions of flow remain the same at adjacent point
4. velocity vector remains constant at a point.
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Question 29 : In a centrifugual pump casing, the flow of water leaving the impeller, is
1. radial flow
2. rectilinear flow
3. forced vertex.
4. free vortex motion
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Question 30 : In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be
1. 2 mm
2. 6 mm
3. 4 mm
4. 8 mm
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