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.Management Sciences
Category: Hydraulic Machines
Impulse turbine is generally fitted______________________?
A. at the level of tail race
B. little above the tail race
C. slightly below the tail race
D. about 2.5 m above the tail race to avoid cavitation
E. about 2.5 m below the tail race to avoid cavitation
Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?
A. 39.2%
B. 49.2%
C. 68.8%
D. 84.8%
E. 91.6%.
Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between_________________?
A. lift and resultant force
B. drag and resultant force
C. lift and tangential force
D. lift and drag
E. resultant force and tangential force
A hydraulic accumulator normally consists of________________?
A. two cylinders, two rams and a storage device
B. a cylinder and a ram
C. two co-axial rams and two cylinders
D. a cylinder, a piston, storage tank and control valve
E. special type of pump with storage device and a pressure regulator
When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be__________________?
A. horizontal
B. nearly horizontal
C. steep
D. first rise and then fall
E. none of the above
In centrifugal pumps, maximum efficiency is obtained when the blades are_________________?
A. straight
B. bent forward
C. bent backward
D. radial
E. given aerofoil section
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
A. designing new impeller
B. trimming the impeller size to the required size by machining
C. not possible
D. some other alterations in the impeller
E. none of the above
Puck up the wrong statement about centrifugal pump_______________?
A. discharge a diameter
B. head a speed2
C. head a diameter
D. Power a speed3
E. none of the above is wrong
In a centrifugal pump, the liquid enters the pump__________________?
A. at the top
B. at the bottom
C. at the center
D. from sides
E. none of the above
Any change in load is adjusted by adjusting following parameter on turbine______________?
A. net head
B. absolute velocity
C. blade velocity
D. flow
E. relative velocity of flow at inlet
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