MCQOPTIONS

Explore topic-wise MCQs in Heat Transfer.

This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.

1.	For the same amount of fabrication material and same inside capacity, the heat loss is lowest in
A.	Sphere
B.	Cylinder
C.	Rectangle
D.	Cube
Answer» C. Rectangle

2.	For the same material and same temperature difference, the heat flow in terms of shape factor is given by
A.	S k d t
B.	k d t/S
C.	2S k/d t
D.	2S/3
Answer» B. k d t/S

3.	The shape factor for complete rectangular furnace isWhere a, b and c are the inside dimensions and d x is the wall thicknessa) 2/ d x (a b + b c + c a) + 4 (0.64) (a + b +c) + 8 (0.45) d xb) 2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d xc) 2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d xd) 2/ d x (a b + b c + c
A.	2/ d x (a b + b c + c a) + 4 (0.64) (a + b +c) + 8 (0.45) d x
B.	2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d xc) 2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d xd) 2/ d x (a b + b c + c a) + 4 (0.54) (a + b +
C.	+ 8 (0.45) d xb) 2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d xc) 2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d x
D.	2/ d x (a b + b c + c a) + 4 (0.54) (a + b +c) + 8 (0.15) d x
Answer» E.

4.	Which is true regarding a complete rectangular furnace?
A.	6 walls, 12 edges and 6 corners
B.	0 walls, 2 edges and 4 corners
C.	6 walls, 12 edges and 8 corners
D.	2 walls, 6 edges and 8 corners
Answer» D. 2 walls, 6 edges and 8 corners

5.	Shape factor for sphere is
A.	4 π r 1 r 2
B.	4 π r 1 r 2/r 2 – r 1
C.	4 π /r 2 – r 1
D.	r 1 r 2/r 2 – r 1
Answer» C. 4 π /r 2 – r 1

6.	The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.6 m * 0.6 m * 1.5 m long with a wall 0.3 m thick all around. Calculate the shape factor for the furnace?
A.	15.24 m
B.	16.34 m
C.	14.54 m
D.	13.76 m
Answer» B. 16.34 m

7.	Shape factor for cylinder is
A.	6 π l/log e (r 2/r 1)
B.	4 π l/log e (r 2/r 1)
C.	π l/log e (r 2/r 1)
D.	2 π l/log e (r 2/r 1)
Answer» E.

8.	For a prescribed temperature difference, bodies with the same shape factor will allow heat conduction proportional to
A.	k/2
B.	2k
C.	k
D.	k/4
Answer» D. k/4

9.	Shape factor for a plane wall is equal to
A.	A/δ
B.	2A/δ
C.	3A/δ
D.	4A/δ
Answer» B. 2A/δ

10.	“All the factors relating to the geometry of the sections are grouped together into a multiple constant called the shape factor”.
A.	True
B.	False
Answer» C.

11.	WHAT_IS_THE_SHAPE_FACTOR_FOR_A_HEMISPHERICAL_BOWL_WITH_RESPECT_TO_ITSELF_OF_DIAMETER_D?_THE_CAVITY_IS_CLOSED_ON_ITS_OUTER_SURFACE_WITH_A_FLAT_PLATE?$
A.	1.5
B.	1
C.	0.5
D.	2.5
Answer» D. 2.5

12.	What is the shape factor of hemispherical surface closed by a plane surface of diameter d?
A.	0
B.	1.5
C.	1
D.	0.5
Answer» E.

13.	What is the value of shape factor for two infinite parallel surfaces separated by a distance x?
A.	0
B.	1
C.	x
D.	Infinity
Answer» C. x

14.	Two radiating surface A 1 = 6 m2 and A 2 = 4 m2 have shape factor F 12 = 0.1. Then the shape factor F 21 will be
A.	0.12
B.	0.18
C.	0.15
D.	0.10
Answer» D. 0.10

15.	The reciprocity theorem states that
A.	F <sub>12</sub> = F <sub>21</sub>
B.	A <sub>1 </sub>F <sub>12 </sub>= A<sub> 2</sub> F <sub>21</sub>
C.	A <sub>1 </sub>F <sub>21 </sub>= A<sub> 2</sub> F <sub>12</sub>
D.	A <sub>2 </sub>F <sub>21 </sub>= A<sub> 1</sub> F <sub>12</sub>
Answer» C. A <sub>1 </sub>F <sub>21 </sub>= A<sub> 2</sub> F <sub>12</sub>

16.	Which of the following is a wrong statement according to the shape factor is equal to one?
A.	For any surface completely enclosed by another surface
B.	For infinite parallel planes radiating only to each other
C.	For a flat or convex surface with respect to itself
D.	Inside cylinder to outer cylinder of a long co-axial cylinder
Answer» E.