Related Questions
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4
The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by
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4
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of
A. High initial and maintenance cost
C. Lower speed of operation
D. Necessity of air vessel
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4
A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit discharge of wheel is
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4
Slip of a reciprocating pump is negative, when
A. Suction pipe is short and pump is running at low speeds
B. Delivery pipe is long and pump is running at high speeds
C. Suction pipe is short and delivery pipe is long and the pump is running at low speeds
D. Suction pipe is long and delivery pipe is short and the pump is running at high speeds
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4
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 = Crosssectional area of jet in m², and V = Velocity of jet in m/s)
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Which of the following is not a reaction turbine?
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The impeller of a centrifugal pump may have
B. Volute casing with guide blades
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The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by
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4
A hydraulic accumulator normally consists of
A. Two cylinders, two rams and a storage device
C. Two coaxial rams and two cylinders
D. A cylinder, a piston, storage tank and control valve
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4
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
A. No flow will take place
B. Cavitation will be formed
C. Efficiency will be low
D. Excessive power will be consumed
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4
The overall efficiency for a Pelton wheel lies between
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4
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is
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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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4
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)
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The power developed by a turbine is (where H = Head of water under which the turbine is working)
A. Directly proportional to H1/2
B. Inversely proportional to H1/2
C. Directly proportional to H3/2
D. Inversely proportional to H3/2
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4
The static head of a centrifugal pump is equal to the ________ of suction head and delivery head.
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4
According to fan laws, for fans having constant wheel diameter, the pressure varies
D. Square root of fan speed
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In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by
A. Designing new impeller
B. Trimming the impeller size to the required size by machining
D. Some other alterations in the impeller
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4
Which type of the pump is different from others in the same group?
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Runaway speed of a hydraulic turbine is
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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4
When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be
D. First rise and then fall
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4
The Fourneyron turbine is _________ reaction turbine.
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The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is
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The unit power developed by a turbine is (where P = Power developed by the turbine under a head of water (H).
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4
Geometric similarity is said to exist between the model and the prototype, if both of them
A. Have identical velocities
B. Are equal in size and shape
C. Are identical in shape, but differ only in size
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4
Low specific speed of a pump implies it is
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The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is
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The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is
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4
The optimum value of vane exit angle for a centrifugal pump impeller is
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Which of the following statement is wrong?
A. The reaction turbines are used for low head and high discharge.
B. The angle of taper on draft tube is less than 8°.
C. An impulse turbine is generally fitted slightly above the tail race.
D. A Francis turbine is an impulse turbine.