Related Questions

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
2 large and 1 small pumps can fill a water tank in 4 hours. 1 large and 3 small pumps can also fill the same water tank in 4 hours . How many hours will it take for 3 large 4 small pumps to fill the tank?
A 2 hours
B 2.5 hours
C 3 hours
D 3.5 hours
2 large and 1 small pumps can fill a water tank in 4 hours. One large and 3 small pumps can also fill the same water tank in 4 hours. how many hours will it take for 3 large and 4 small pumps to fill the tank?
A 2 hours
B 2.5 hours
C 3 hours
D 3.5 hours
The cost of manufacturing x water pumps is Tk.9000+400x. The amount received by selling these x water pumps is Tk. 500x. What is the least number of water pumps that must be manufactured and sold so that that the amount recieved is at least equal to the manufacturing cost ?
A 50
B 60
C 90
D 100
Reciprocating pumps compared to centrifugal pumps
A Deliver liquid at uniform pressure
B Can handle slurries more efficiently
C Are not subject to air binding
D Can be operated with delivery valve closed
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of
A High initial and maintenance cost
B Lower discharge
C Lower speed of operation
D Necessity of air vessel
Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have
A Very low speeds
B Smaller discharge
C Higher capital &maintenance cost
D High vibrations
Centrifugal pumps as compared to reciprocating pumps
A Run at a lower speed for the same discharge
B Do not need priming
C Deliver fluid with pulsating/fluctuating discharge
D Can be run with discharge line valve closed for a short interval
The ratio of the workdone on the blades to the energy supplied to the blades, is called
A Blading efficiency
B Nozzle efficiency
C Gross or stage efficiency
D Mechanical efficiency
If 18 pumps can raise 2170 tonnes of water in 10 days , working 7 hours a day ; in how many days will 16 pumps raise 1736 tonnes of water , working 9 hours a day ?
A 6
B 7
C 8
D 9

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