11.

12.

13.

14.

099/23

Air at 300 K flows over a 4 m long and 1.8 m wide surface of a plate with velocity of
5 m/s. The length of the surface beyond which the flow remains turbulent is

[For air, K = 0.02 W/mK, P, = 0.717, y= 1.7 x 10° m/s]
A) 1.5m B) 1.7m
0) 2.2m D) 4m

Choose the correct option from the following statements for compressible flow of
fluid.

A) The higher the particle Mach number, the more slender the Mach cone

B) The lower the particle Mach number, the more slender the Mach cone

C) The lower the particle Mach number, the less or more slender can be the Mach cone
)

D) None of the above

In fully turbulent flow through a rough pipe, the friction factor ‘f is a function of
[Where Re is Reynolds number and 56 is relative roughness]

A) ‘Re’ and 56
B) ‘Re’ only

C) Independent of ‘Re’ and 50 ,

D
D) 56 only

Match the dimensionless number given in List —| to the type of force which are one
of the constituents describing these numbers in List — Il.

List -1 List -Il

a. Weber number 1. Pressure force
b. Froude number 2. Surface tension force
c. Euler number 3. Elastic force
d. Mach number 4. Gravity force
a b ௦ d
A) 2 1 4 3
B) 2 4 1 3
௦ 1 2 4 3
D) 4 2 3 1