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
Erosion and pits formation on the impeller of a centrifugal pump may be due to
A Cavitation
B Low speed of impeller
C Its operation with delivery valve closed for considerable time after starting the pump
D Off centering of pump with motor
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
Be careful when draining ---- adverse weather condition. Fill in the blank with appropriate word.
A to
B under
C along
D during
Veins draining into the left brachiocephalic vein include
A Inferior thyroid
B Left internal thoracic
C Thymic
D Azygos
E Both vertebral
Canals constructed for draining off water from water logged areas, are known
A Drains
B Inundation canals
C Valley canals
D Contour canals
The method of draining in the tunnels, is generally known as
A Foredrainage
B Dewatering
C Permanent drainage
D All of the above
The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
A Regenerative heating
B Reheating of steam
C Bleeding
D None of these
Which of the following can store information in the form of microscopic pits on metal disks.
A Laser disks
B Tape cassettes
C RAM cartridge
D Punched cards
E None of the above

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