Motion of a liquid in a volute casing of a centrifugal pump is an example of

Volute casing of a centrifugal pump does not facilitate

A

Uniform flow of fluid coming out of the impeller

B

Increase in the pump efficiency

C

Conversion of the part of the velocity head to the pressure head

D

Conversion of the part of the pressure head to velocity head

Which of the following is not the function of a volute casing provided in a centrifugal pump?

A

To reduce the head loss in discharge

B

To increase the pump efficiency

C

To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity

D

To increase the pump discharge rate

Volute type of casing is provided in a centrifugal pump to

A

Convert velocity head to pressure head

B

Convert pressure head to velocity head

C

Reduce the discharge fluctuation

D

Increase the discharge

Volute of a centrifugal pump should be designed in a fashion, such that the

A

Kinetic head gets converted into static head

B

Moving stream gradually reduces velocity

C

Mean velocity remains constant

D

None of these

A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump

A

Develops a lower head

B

Capacity is reduced

C

Requires more power

D

All of the above

একটি পানিপূর্ণ কুয়ার গভীরতা 20m ও ব্যাস 2 m. কুয়াটিকে পানি শূণ্য করার জন্য 5 HP এর একটি পাম্প লাগানো হল। অর্ধেক পানি তোলার পর পাম্পটি নষ্ট হয়ে গেল। বাকি পানি তোলার জন্য একই ক্ষমতা সম্পন্ন আর একটি পাম্প লাগানো হল। প্রথম পাম্প দ্বারা সম্পাদিত কাজের পরিমান নির্ণয় কর।(The depth and diameter of a water filled well are 20 m and 2 m respectively. An engine of 5 HP is attached to pump out the water. The pump was ruined after emptying half of the water. Then another pump of same capacity was attached to pump out rest of the water. Determine the work done by first pump.)

A

2.54 × 104 J

B

1.44 × 104 J

C

2.34×104 J

D

1.54 × 104 J

E

1.54 ×104 J

In a centrifugal pump casing, the flow of water leaving the impeller, is

A

Rectilinear flow

B

Radial flow

C

Free vortex motion

D

Forced vortex

In a centrifugal pump casing, the flow of water leaving the

A

Radial

B

Axial

C

Centrifugal

D

Vortex

Good design of the casing of a centrifugal pump aims at minimising the

A

Cavitation

B

Frictional losses

C

Kinetic energy loss

D

Static head

Design of the casing of centrifugal pump should be such as to minimise the

A

Back flow through impeller

B

Loss of kinetic head

C

Loss of static head

D

None of these

Motion of a liquid in a volute casing of a centrifugal pump is an example of

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