In a centrifugal pump, the liquid enters the pump__________________?
(A) at the top
(B) at the bottom
(C) at the center
(D) from sides
(D) 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
(D) given aerofoil section
The optimum value of vane exit angle for a centrifugal pump impeller is_________________?
(A) 10-15°
(B) 20-25°
(C) 30-40°
(D) 50-60°
(D) 80-90°.
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge_____________________?
(A) same quantity of liquid
(B) 0.75 Q
(C) Q/0.75
(D) 1.5 Q
(D) none of the above
Air vessels in reciprocating pump are used to__________________?
(A) smoothen flow
(B) reduce acceleration to minimum
(C) increase pump efficiency
(D) save pump from cavitation
(D) increase pump head
In axial flow fans and turbines, fluid enters and leaves as follows________________?
(A) radially, axially
(B) axially, radially
(C) axially, axially
(D) radially, radially
(D) combination of axial and radial
The angle of taper on draft tube is A. greater than 15° B. greater than 8° C. greater than 5° D. less than 8° E. less than 3°.___________________?
(A) greater than 15°
(B) greater than 8°
(C) greater than 5°
(D) less than 8°
(D) less than 3°.
Reaction turbines are used for____________________?
(A) low head
(B) high head
(C) high head and low discharge
(D) high head and high discharge
(D) low head and high discharge
The flow rate in gear pump___________________?
(A) increases with increase in pressure
(B) decreases with increase in pressure
(C) more or less remains constant with in-crease in pressure
(D) unpredictable
(D) none of the above
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
(D) resultant force and tangential force