The ratio of inertia force to pressure forces is related with a non-dimensional number known as
A.Reyonolds number
B.Euler number
C.Nusselt number
D.Mach number
E.Weber number
Category: Fluid Mechanics and Hydraulic Machines Mcqs
Specific speed of a impulse turbine ranges from
A.0 – 4.5
B.100 – 140
C.100 – 200
D.200 – 300
E.300 – 800
The Weber number is the ratio of
A.Inertial forces to surface tension force
B.Intertial forces to viscous forces
C.Elastic forces to pressure forces
D.Viscous forces to gravity
E.Elastic forces to gravity
Which conduit entrance is expected to have highest loss coefficient?
A.Inward projecting entrances
B.Fully rounded entrance having x/D>0.15
C.Gate in thin wall-unsuppressed contraction
D.Gate in thin wall-bottom and side suppressed
E.Gate in thin wall-corners rounded
The arch dam is not suitable for
A.Narrow sites
B.Wider sites
C.Small discharge
D.Low heads
E.Small discharge and low heads
1 lb/in2 pressure is equivalent to
A.144 lb/ft2
B.6.8046 x 10-2
C.6.8947 x 103 kg/m-sec2
D.0.06895 bar
E.Any of the above
Which one of the following results in loss in an electric generator
A.Air drag
B.Friction in bearing
C.Direct current power for excitation
D.Heat generated in armature winding
E.All of the above
Which two forces are most important in laminar flow between closely spaced parallel plates
A.Inertial, viscous
B.Pressure, inertial, inetial
C.Gravity, pressure
D.Viscous, pressure
E.None of the above
A Pelton wheel is
A.Inward flow impulse turbine
B.Outward flow impulse turbine
C.Inward flow reaction turbine
D.Aoutward flow reaction turbine
E.Axial flow impulse turbine
