The angle of contact in case of a liquid depends upon
A. The nature of the liquid and the solid
B. The material which exists above the free surface of the liquid
C. Both of die above
D. Any one of the above
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The loss of head at exit of a pipe is (where v = Velocity of liquid in the pipe)
A. 2 g v 2
B. 2 g 0.5 v 2
C. 2 g 0.375 v 2
D. 2 g 0.75 v 2
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The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)
A. 2 g v 2
B. 2 g 0.5 v 2
C. 2 g 0.375 v 2
D. 2 g 0.75 v 2
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Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as
A. Lift
B. Drag
C. Stagnation pressure
D. Bulk modulus
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Euler's equation in the differential form for the motion of liquids is given by
A. ρ dp + gdz + vdv = 0
B. ρ dp − gdz + vdv = 0
C. ρ dp + gdz + vdv = 0
D. ρ dp − gdz + vdv = 0
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A structure used to dam up a stream or river over which the water flows is called
A. Orifice
B. Notch
C. Weir
D. Dam
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A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the
A. Kinetic head
B. Velocity head
C. Manometric head
D. Static head
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An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.
A. Less than twice
B. More than twice
C. Less than three times
D. More than three times
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An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice.
A. Free
B. Partially
C. Full
D. None of these
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Total pressure on a 1 m × 1 m gate immersed vertically at a depth of 2 m below the free water surface will be
A. 1000 kg
B. 4000 kg
C. 2000 kg
D. 8000 kg
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Francis, Kaplan and propeller turbines fall under the category of
A. Impulse turbines
B. Reaction turbines
C. Axial flow turbines
D. Mixed flow turbines
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Which of the following pump is successfully used for lifting water to the boilers?
A. Centrifugal pump
B. Reciprocating pump
C. Jet pump
D. Airlift pump
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The value of mass density in kg-sec-V-m4 for water at 0°C is
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If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge
A. Same quantity of liquid
B. 0.75Q
C. 0.75 Q
D. 1.5Q
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The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)
A. 60 t μ π 2 N ( R 1 − R 2 )
B. 60 t μ π 2 N ( R 1 2 − R 2 2 )
C. 60 t μ π 2 N ( R 1 3 − R 2 3 )
D. 60 t μ π 2 N ( R 1 4 − R 2 4 )
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In a reaction turbine, the draft tube is used
A. To run the turbine full
B. To prevent air to enter the turbine
C. To increase the head of water by an amount equal to the height of the runner outlet above the tail race
D. To transport water to downstream
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In reaction turbine, draft tube is used
A. To transport water downstream without eddies
B. To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
C. For safety of turbine
D. To increase flow rate
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The flow rate in gear pump
A. Increases with increase in pressure
B. Decreases with increase in pressure
C. More or less remains constant with increase in pressure
D. Unpredictable
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The increase of temperature results in
A. Increase in viscosity of gas
B. Increase in viscosity of liquid
C. Decrease in viscosity of gas
D. Decrease in viscosity of liquid
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Runaway speed of a hydraulic turbine is
A. Full load speed
B. The speed at which turbine runner will be damaged
C. The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
D. The speed corresponding to maximum overload permissible
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