Online Mechanical Engineering Test - Hydraulic Machines Test
Instruction:
- This is a FREE online test. Beware of scammers who ask for money to attend this test.
- Total number of questions: 20.
- Time allotted: 30 minutes.
- Each question carries 1 mark; there are no negative marks.
- DO NOT refresh the page.
- All the best!
Marks : 2/20
Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.
1.
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.
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2.
In a Kaplan turbine runner, the number of blades are generally between
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3.
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
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4.
Which of the following turbine is preferred for 0 to 25 m head of water?
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5.
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
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6.
Discharge of a centrifugal pump is
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Explanation:
Discharge of a centrifugal pump is directly proportional to (Diameter)^2 of its impeller.
Head of a centrifugal pump is directly proportional to (Diameter)^2 of its impeller.
Power Developed of a centrifugal pump is directly proportional to (Diameter)^4 of its impeller.
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7.
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
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8.
When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
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9.
Geometric similarity is said to exist between the model and the prototype, if both of them
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10.
An impulse turbine is used for
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11.
The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.
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12.
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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13.
The discharge through a reaction turbine __________ with the increase in unit speed.
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14.
Overall efficiency of a centrifugal pump is the ratio of
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15.
In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.
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16.
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.
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17.
Manometric head is the actual head of water against which a centrifugal pump has to work.
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18.
Which of the following pump is sucessfully used for lifting water to the boilers?
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19.
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
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20.
The power of a centrifugal pump working under constant head and discharge increases with the speed.
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