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.Management Sciences
Category: Hydraulic Machines
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
E. none of the above
For small discharge at high pressure, following pump is preferred_____________________?
A. centrifugal
B. axial flow
C. mixed flow
D. propeller
E. reciprocating
Low specific speed of turbine implies it is__________________?
A. propeller turbine
B. Francis turbine
C. impulse turbine
D. any one of the above
E. none of the above
In reaction turbine, draft tube is used_____________________?
A. to transport water downstream without eddies
B. to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
C. for safety of turbine
D. to increase flow rate
E. none of the above
A turbine pump is basically a centrifugal pump equipped additionally with_________________?
A. adjustable blades
B. backward curved blades
C. vaned diffusion casing
D. inlet guide blades
E. totally submerged operation facility
The maximum number of jets generally employed in impulse turbine without jet interference is________________?
A. 4
B. 6
C. 8
D. 12
E. 16.
Reaction turbines are used for____________________?
A. low head
B. high head
C. high head and low discharge
D. high head and high discharge
E. low head and high discharge
According to fan laws, at constant weight of air or gas, the speed, capacity and pressure 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
In a centrifugal pump casing, the flow of water leaving the impeller, is___________________?
A. rectilinear flow
B. radial flow
C. free vortex motion
D. forced vortex
E. none of the above
Hydraulic accumulator is used for____________________?
A. accumulating oil
B. supplying large quantities of oil for very short duration
C. generally high pressures to operate hydraulic machines
D. supplying energy when main supply fails
E. accumulating hydraulic energy
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