Related Questions

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
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
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
Priming of a centrifugal pump is done to
A Increase the mass flow rate of fluid
B Develop effective pressure rise by the pump
C Avoid chances of separation inside the impeller
D None of these
Self-priming centrifugal pump can be used for
A Booster service
B Pumping liquid fertilisers (e.g. liquid NH3)
C Pumping industrial wastes
D All of the above
Priming is needed in a __________ pump.
A Reciprocating
B Gear
C Centrifugal
D Diaphragm
A boat has a crack in its bull which is leaking water into the boat and could pump which can pump the water out in 8 hours . If the boat is 168 km away from the shore and the pump is running what is the minimum speed the boat should run at so that it can reach the shore before sinking?
A 5km./hour
B 6 km/hour
C 7 km/hour
D 8km/hour
Only when . . . . . . failed, the police resorted to . . . . . .
A efforts , power
B arrests , imprisonment
C persuasions , force
D power , punishment
E manipulations , arrests
Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
A Cheap electricity is available
B The precious metal content of copper is high
C There is a demand for ultrapure (99.99%) electrolytic copper
D All of the above
Why non-medical underwriting is resorted to ?
A To verify the income of the proposer
B To save on cost of conducting medical exam
C To check the antecedents of a person
D To satisfy about the health of the proposer

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