Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the

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

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

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

In a centrifugal pump, the regulating valve is provided on the

A

Casing

B

Delivery pipe

C

Suction pipe

D

Impeller

The vent valve provided in a liquid handling centrifugal pump is

A

Generally a needle valve

B

Used to release any gases that might be vapour locking the pump

C

Helpful in easy removal of samples

D

All of the above

Foot valve provided in the pump is a __________ valve.

A

Direction control

B

Back pressure

C

Relief

D

Pressure reduction

Working alone, pump A can empty a pool in 3 hours. Working alone, pump B can empty the same pool in 2 hours. Working together, how many minutes will it take pump A and pump B to empty the pool?

A

72

B

75

C

84

D

96

For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is

A

More

B

Less

C

Equal

D

Either A or B; depends on the viscosity of the fluid

While starting a centrifugal pump, its delivery valve should be kept

A

Opened

B

Closed

C

Either opened or closed ; it does not make any difference

D

Either opened or closed; depending on the fluid viscosity

Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the

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