In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.

Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.

A

NPSH required

B

BHP required by the pump

C

Head of the liquid pumped

D

All of the above

Which is the correct relationship for a centrifugal pump? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)

A

D = 1840 H^0.5/N

B

D = 1840 N/H^0.5

C

H = 1840 D^0.5/N

D

D = 1840 H/N

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

In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller.

A

Speed of

B

Diameter of

C

Fluid velocity leaving

D

All of the above

The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.

A

Inlet tip of a blade curves in a direction opposite to that

B

Outlet tip of a blade curves in a direction opposite to that

C

Inlet tip of a blade is towards the direction

D

Outlet tip of a blade is towards the direction

Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

A

Directly proportional to N

B

Inversely proportional to N

C

Directly proportional to N²

D

Inversely proportional to N²

Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.

A

Radius of

B

Speed of

C

Fluid velocity leaving

D

None of these

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

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

A

Kinetic head

B

Velocity head

C

Manometric head

D

Static head

At a constant speed of the centrifugal pump . it __________ the impeller diameter.

A

Capacity varies directly with

B

Head varies as the square of

C

Horsepower varies as the cube of

D

All of the above

In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.

Related Questions