Online Mechanical Engineering Test - Hydraulic Machines Test
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- Total number of questions: 20.
- Time allotted: 30 minutes.
- Each question carries 1 mark; there are no negative marks.
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Marks : 2/20
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Test Review : View answers and explanation for this test.
In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.
In a Kaplan turbine runner, the number of blades are generally between
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 power of the wheel is
Which of the following turbine is preferred for 0 to 25 m head of water?
The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as
Discharge of a centrifugal pump is
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
Geometric similarity is said to exist between the model and the prototype, if both of them
An impulse turbine is used for
The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.
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
The discharge through a reaction turbine __________ with the increase in unit speed.
Overall efficiency of a centrifugal pump is the ratio of
In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.
A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.
Manometric head is the actual head of water against which a centrifugal pump has to work.
Which of the following pump is sucessfully used for lifting water to the boilers?
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
The power of a centrifugal pump working under constant head and discharge increases with the speed.
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