No. of Printed Pages : 3

BIME-02b1

DIPLOMA VIEP MECHANICAL ENGINEERING (DMEVI) o Term-End Examination June, 2013

C

BIME-026: HEAT TRANSFER Time : 2 hours

Maximum Marks : 70

Note : Attempt any five questions. Assume suitable missing data if any. 1.

(a) What are the three modes of heat transfer ?

7

Discuss the difference between them. (b) State and explain Fourier's law of heat

7

conduction. 2.

(a) Define and explain critical thickness of an

7

insulation. (b) A composite wall is made up of two slabs

7

with outermost surface temperatures maintained at 1300°C and 115°C. The first slab has a thickness of 500 mm and thermal conductivity of 1.4 W/mK and the thickness and the thermal conductivity of the second slab are 161 mm and 0.35 W/mK respectively. Calculate the conduction heat transfer through this composite wall per square metre and the temperature of the surfaces in contact. BIME-026

1

P.T.O.

3.

(a) How does transient heat conduction differ from steady conduction ? (b) A copper slab of surface area 0.25 m2 and

7 7

thickness 10 mm has a uniform temperature of 300°C. Its temperature is suddenly lowered by convection in ambient temperature of 40°C with h = 90 W m2 °C. Calculate the time required for the slab to reach the temperature of 110°C. Take p = 19000 kg/m3, C=0.38 kJ/kg°C and / m°C K=370 W 4.

Find the rate of convective heat transfer from a 14 0.4 m vertical square plate maintained at uniform temperatures 130°C in ambient air at 25°C. Take v = 20.75 x10-6

, /r = 0.697 and

K= 0.03 W/mK. 5.

Explain the method of classifying regions as 14 laminor, transition and turbulent when forced convection heat transfer takes place over a flat plate.

6.

(a) Define total emissive power and 7 monochromatic emissive power of a black body.

BIME-026

2

(b) Explain unstable film boiling. Give examples.

7.

Define the following terms. (a)

Biot Number.

(b)

Black body and gray body.

(c)

Wien's displacement law.

(d)

Stefon - Bottzman Law.

BIME-026

3

7

3.5x4=14

June 2013

respectively. Calculate the conduction heat transfer through this composite wall per square metre and the temperature of the surfaces in contact. BIME-026. 1.

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