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Consider the schema Sailors(sid, sname, rating, age) with the following data Sid Sname Rating age 22 Dustin 7 45 29 Borg 1 33 31 Pathy 8 55 32 Robert 8 25 58 Raghu 10 17 64 Herald 7 35 71 Vishnu 10 16 74 King 9 35 85 Archer 3 26 84 Bob 3 64 96 Flinch 3 17 For the query SELECT S.rating, AVG(S.age) AS avgage FROM Sailors S Where S.age >= 18 GROUP BY S.rating HAVING 1 < (SELECT COUNT(*) FROM Sailors S2 where S.rating = S2.rating) The number of rows returned is
A, B and C are three small pumps fitted to a tank. D is a large pump fitted to the tank. Pump B is 25% more efficient than A. Pump C is 20% more efficient than B. Pump D is 4/3rd efficient of pump C. All of the pumps are used to fill the tank. What is the ratio of the time taken by pumps A and B to fill the tank together to the time taken by the pumps B and D to fill the tank together?
Which of the following statement/s is/are relating to credit rating agencies?
1. The three largest credit rating agencies rate India's sovereign debt at the highest investment grade.
2. CRISIL is the largest credit rating agency in India but is not among the largest three in the world.
3. The three largest credit rating agencies in the world are Moody's, Standard and Poor's and Fitch.
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.) 
P. A weir is a hydraulic structure where majority or the entire ponding is achieved by a raised crest and smaller part or nil part by the shutters. Q. A weir is a hydraulic structure that is made by constructing the width of the channel only. R. A barrage is a hydraulic structure that is made by creating a choking condition only. S. A barrage is a hydraulic structure where majority or the entire ponding is achieved by a shutter and smaller part or nil part by the raised crest. Identify the correct statements in the above.
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 centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump
In the question below are given two statements followed by two conclusions numbered I and II. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: I. Only a few generator is pump II. Some pump is gasoline Conclusions: I. Some pump is not gasoline II. Some generator is not pump
If the gear ratio for fuel pump is thrice that of the oxidizer pump, the shaft speed of fuel pump is ____________ the oxidizer pump.
A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now