Vizag Steel Plant RINL Chemical Engineering

Vizag Steel Plant 2013 Model Questions and Answers for

Chemical Engineering  Heat Transfer

1.  Loss of heat from unlagged steam pipe to the ambient air is by

(a) conduction

(b) convection

(c) radiation

(d) all (a),(b) & (c)    (Ans)

2.  Fourier's law applies to the heat transfer by 

(a) convection

(b) radiation

(c) conduction     (Ans)

(d) all (a),(b) & (c)

3.  Fourier's law of heat conduction applies to .......... surfaces.

(a) isothermal

(b) non-isothermal

(c) both (a) and (b)     (Ans)

(d) neither (a) and (b)

4.  Unsteady state heat conduction occurs, when

(a) temperature distribution is independent of time

(b) temperature distribution is dependent on time    (Ans)

(c) heat flows in one direction only

(d) three dimensional heat flow is concerned

5.  What is the unit of thermal conductivity ?

(a) Kcal/hr.m^2 0C

(b) Kcal/hr.m. ⁰C   (Ans)

(c) Kcal/hr.m

(d) Kcal/hr.⁰C

6.  The unit of heat transfer co-efficient is

(a) BTU/hr.ft^2 0F   (Ans)

(b) BTU/hr.⁰F.ft.

(c) BTU/hr.⁰F

(d) BTU/hr.ft

7.  Which of the following is correct ?

(a) Rate = Driving force * Resistance

(b) Driving force = Rate * Resistance    (Ans)

(c) Resistance = Driving force * Rate

(d) Rate = Resistance/Driving force

8.  An insulator should have

(a) low thermal conductivity    (Ans)

(b) high thermal conductivity

(c) less resistance to heat flow

(d) a porous structure

9.  Heat flux through several resistance in series in analogous to the current flowing through several

(a) resistances in parallel

(b) capacitors in series

(c) resistances in series     (Ans)

(d) none of these