If the absolute pressure at a point in a hydraulic system is less than atmospheric pressure, the point is said to possess
A.Positive head
B.Negative head
C.Absolute positive head
D.Gross positive head
E.Manometric head
Category: Fluid Mechanics and Hydraulic Machines Mcqs
Which type of pump is different from others in the same group?
A.Gear pump
B.Screw pump
C.Lobe pump
D.Cam and piston pump
E.Plunger pump
A simple pitot tube is used to measure
A.The pressure in a static fluid
B.The velocity in a flowing stream
C.The total pressure
D.The dynamic pressure
E.The undistributed fluid pressure
The depth of oil having specific gravity 0.6 to produce a pressure of 3.6 kg/cm2 will be
A.40 m of oil
B.36 m of oil
C.50 m of oil
D.60 m of oil
E.120 m of oil
The upper critical Reynolds number is
A.Important from a design view point
B.The number at which turbulent flow changes to laminar flow
C.About 2000
D.Not more than 2000
E.Of no practical importance in pipe flow problems
Boundary layer thickness (?) is the distance from the surface of the solid body in the direction perpendicular to flow, where the velocity of fluid is equal to
A.Free stream velocity
B.0.9 times the free stream velocity
C.0.99 times the free stream velocity
D.None of the above
The units of kinematic viscosity are
A.kg/m2-sec
B.kg sec/m2
C.m/kg sec
D.m2/sec
E.m kg/sec.
The loss of pressure head for the laminar flow through pipes varies
A.As the square of velocity
B.Directly as the velocity
C.As the inverse of the velocity
D.None of the above
The specific speed of a pump is defined as the speed of a pump
A.Of unit size with unit discharge at unit head
B.Of such size that it requires unit power for unit head
C.Of such size that it delivers unit discharge at unit head
D.Of such size that it delivers unit discharge at unit power
E.None of these answers
Highest value of sliding factor may be expected in case of
A.Concrete on sand
B.Concrete on rock
C.Concrete on clayey soil
D.Concrete on gravel
E.Concrete on fine gravel
