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38.

A wall of length 4 m, height 3 m and thickness 0.4 m, has the inner wall surface at 140°C
and that the outer at 20°C. If the thermal conductivity of wall material is 0.85 W/mK, the
temperature at 10 cm from the inner wall is :

(५) 120*€ (8) 90% (©) 110°C (೧) 80°C
Convective heat transfer is quantified by ;
(ക) Fourier's law (8) Newton's law

(C) Stefan-Boltzmann law (D) Kirchhotf's law

For a black body :

(A) Absorption is maximum (8) Radiation is maximum

(ய) Reflection is zero (0) All the above

Agraybodvisa:

{A) Ordinary body (B) Opaque body (C) Black body (ಐ) White body

Select the positive displacement compressor :
(ക) Roots blower (ए) Vane blower
(0) Reciprocating compressor {D) All the above

When equal and opposite forces applied to a body, tend 10 elongate it, the stress to produced
15 called :

{A) Shear stress (8) Compressive stress

(८) Tensile stress (3) Transverse stress

The property of a material by which it can be drawn, due to tension to a smaller section is
called :

(ക) Plasticity (ए) Ductility (9 Elasticity (0) Malleability

Factor of safety is the ratio of :

{A) Yield stress and working stress

(8) Tensile stress and working stress

(C) Compressive stress and working stress

(D) Bearing stress and vield stress

7 158/2016
1.7.0.