86.

87.

88.

89.

90.

91.

92.

Dankwert's surface renewal theory is given by :

ಸಿ
(4) ಶ್‌ © kiD,
2 ‏ھ5‎
‎© ‰ (ಸಸರ,
D,

In a binary distillation operation, if the feed contains 30 mol % vapour, the slope of the
g line will be :

(ക) 3 (8) -23

© 08 (2) -0.8

In a distillation separation, distillate contains 80% more volatile component. The g-line
intersects the equilibrium curve at (0.3, 0.6). Find the minimum reflux ratio, consuming
Me.Cabe Thiele method :

ல்‌ 0.67 (8) 15
(C) ‏8ص‎ (D) 0.4
NTU is considered as a :
(A) Performance of the equipment (B) Measure of departure from ideality
(C) Measure of approach to ideality (D) Measure of difficulty of separation
Packed tower operates at :

(മ) Low pressure drop and low hold up (3) Low pressure drop and high hold up
(© High pressure drop and low holdup (D) High pressure drop and high hold up

A composite wall of a furnace is made of two materials A and B. The thermal conductivity of
A is twice that of B and the thickness of A is half of B. If the temperatures at 2 sides of the
wall are 400 and 1200 K respectively, the temperature drop (in K) across the layer of
material A is :

(A) 400K (B) 200K
(0) 160K (D) 100K

The heat transfer by radiation from a mild steel surface is to be reduced by reducing the
emissivity of the surface. This can be achieved by :

(ಗ) Painting the surface block (18) Painting the surface white

(0) Ghving surface a mirror finish (D) Roughening the surface

13 24/2015
10]