Font size
WorksheetsOblique shock and Expansion wave CO3
Total questions: 10
Worksheet time: 10mins
Which of the following assumptions are made for the analysis of Fanno flow? (i) Area of the duct is constant (ii) The flow is steady and one-dimensional (iii) There is no work or heat transfer (iv) Wall friction is the only driving potential for the flow.
all of them
(i), (ii) and (iii)
(i) and (ii)
(ii), (iii) and (iv)
In analyzing simple frictional flows, the wall frictional force is related to the _____ through an empirically determined friction coefficient.
heat transfer
work transfer
bulk flow properties
flow area
In Rayleigh flow, for a given set of initial conditions, there is a limiting state where the entropy is maximum, and at that state fluid velocity is
greater than local acoustic speed
less than local acoustic speed
equal to local acoustic speed
none of the above
If a body moves in a perfect frictionless fluid and shock waves are generated, a drag force called _____ is produced.
shock drag
wave drag
form drag
skin friction drag
The wave drag is
dependent on skin friction drag
dependent on form drag
dependent on skin friction drag and form drag
independent of skin friction drag and form drag
All the normal shock relations are applicable to ______ ahead and behind an oblique shock.
enthalpies
densities
tangential components of velocities
normal components of velocities
The thermodynamic properties of the gas behind the oblique shock wave depend on _____.
Mach number and velocity
Flow deflection angle
upstream conditions and flow deflection angle
wave angle
Pick out the wrong statement (i) Oblique shock wave emanates from concave corner (ii) Expansion wave emanates from convex corner (iii) Entropy of the fluid increases across an oblique shock wave (iv) None of the above
(i)
(ii)
(iii)
(iv)
A steady uniform two-dimensional supersonic flow around a convex corner is known as ____.
Isentropic expansion
Isothermal expansion
Prandtl Meyer expansion
None of the above
As a fluid flows around a convex corner, it accelerates from M1 > 1 to
M2 > M1
V2 > V1
p2 < p1
all the above
