# Online Mechanical Engineering Test - Hydraulic Machines Test

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Instruction:

• This is a FREE online test. DO NOT pay money to anyone to attend this test.
• Total number of questions : 20.
• Time alloted : 30 minutes.
• Each question carry 1 mark, no negative marks.
• DO NOT refresh the page.
• All the best :-).

1.

In a Kaplan turbine runner, the number of blades are generally between

A.
 2 to 4
B.
 4 to 8
C.
 8 to l6
D.
 16 to 24

Your Answer: Option (Not Answered)

Correct Answer: Option B

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2.

Discharge of a centrifugal pump is

A.
 directly proportional to diameter of its impeller
B.
 inversely proportional to diameter of its impeller
C.
 directly proportional to (diameter)2 of its impeller
D.
 inversely proportional to (diameter)2 of its impeller

Your Answer: Option (Not Answered)

Correct Answer: Option C

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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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

A.
 0.25 kW
B.
 0.75 kW
C.
 1.75 kW
D.
 3.75 kW

Your Answer: Option (Not Answered)

Correct Answer: Option C

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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
D.
 have identical forces

Your Answer: Option (Not Answered)

Correct Answer: Option C

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5.

Which of the following turbine is preferred for 0 to 25 m head of water?

A.
 Pelton wheel
B.
 Kaplan turbine
C.
 Francis turbine
D.
 none of these

Your Answer: Option (Not Answered)

Correct Answer: Option B

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6.

When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.

A.
 Agree
B.
 Disagree

Your Answer: Option (Not Answered)

Correct Answer: Option B

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7.

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

Your Answer: Option (Not Answered)

Correct Answer: Option D

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8.

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.

A.
 True
B.
 False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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9.

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

A.
 manometric efficiency
B.
 mechanical efficiency
C.
 overall efficiency
D.
 volumetric efficiency

Your Answer: Option (Not Answered)

Correct Answer: Option D

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10.

Overall efficiency of a centrifugal pump is the ratio of

A.
 energy available at the impeller to the energy supplied to the pump by the prime mover
B.
 actual workdone by the pump to the energy supplied to the pump by the prime mover
C.
 energy supplied to the pump to the energy available at the impeller
D.
 manometric head to the energy supplied by the impeller per kN of water

Your Answer: Option (Not Answered)

Correct Answer: Option B

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11.

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.

A.
 Correct
B.
 Incorrect

Your Answer: Option (Not Answered)

Correct Answer: Option A

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12.

The discharge through a reaction turbine __________ with the increase in unit speed.

A.
 remains same
B.
 increases
C.
 decreases

Your Answer: Option (Not Answered)

Correct Answer: Option C

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13.

The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.

A.
 equal to
B.
 1.2 times
C.
 1.8 times
D.
 double

Your Answer: Option (Not Answered)

Correct Answer: Option B

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14.

An impulse turbine is used for

A.
 low head of water
B.
 high head of water
C.
 medium head of water
D.
 high discharge

Your Answer: Option (Not Answered)

Correct Answer: Option B

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15.

In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.

A.
 Correct
B.
 Incorrect

Your Answer: Option (Not Answered)

Correct Answer: Option A

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16.

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

A.
 0.25 m3/s
B.
 0.5 m3/s
C.
 1.5 m3/s
D.
 2.5 m3/s

Your Answer: Option (Not Answered)

Correct Answer: Option A

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17.

Which of the following pump is sucessfully used for lifting water to the boilers?

A.
 Centrifugal pump
B.
 Reciprocating pump
C.
 Jet pump
D.
 Air-lift pump

Your Answer: Option (Not Answered)

Correct Answer: Option C

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18.

Manometric head is the actual head of water against which a centrifugal pump has to work.

A.
 Correct
B.
 Incorrect

Your Answer: Option (Not Answered)

Correct Answer: Option A

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19.

The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

A.
 slow speed pump with radial flow at outlet
B.
 medium speed pump with radial flow at outlet
C.
 high speed pump with radial flow at outlet
D.
 high speed pump with axial flow at outlet

Your Answer: Option (Not Answered)

Correct Answer: Option A

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20.

The power of a centrifugal pump working under constant head and discharge increases with the speed.

A.
 True
B.
 False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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