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.Management Sciences
Category: Hydraulic Machines
The horse power required in above case will be___________________?
A. same
B. 0.75 B.H.P.
C. B.H.P./0.75
D. 1.5 B.H.P.
E. none of the above
The efficiency of a centrifugal pump is maximum when its blades are__________________?
A. straight
B. bent forward
C. bent backward
D. bent forward first and then backward
E. bent backward first and then forward
Maximum impulse will be developed in hydraulic ram when ___________________?
A. waste valve closes suddenly
B. supply pipe is long
C. supply pipe is short
D. ram chamber is large
E. supply pipe has critical diameter
According to fan laws, at constant speed and capacity, the pressure and power vary_____________________?
A. directly as the air or gas density
B. inversely as square root of density
C. inversely as density
D. as square of density
E. as square root of density
For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred_________________?
A. centrifugal
B. axial flow
C. reciprocating
D. mixed flow
E. none of the above
Francis, Kaplan and propeller turbines fall under the category of___________________?
A. Impulse turbines
B. Reaction turbines
C. Axial flow turbines
D. Mixed flow turbines
E. Reaction-cum-impulse turbines
Casting of a centrifugal pump is designed so as to minimize________________?
A. friction loss
B. cavitation
C. static head
D. loss of kinetic energy
E. starting time
Which place in hydraulic turbine is most susceptible for cavitation __________________?
A. inlet of draft rube
B. blade inlet
C. guide blade
D. penstock
E. draft tube exit
Specific speed for reaction turbines ranges from___________________?
A. 0 to 4.5
B. 10 to 100
C. 80 to 200
D. 250 to 300
E. none of the above
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