CONDUCTION WILL INCREASE 4. CONVECTION WILL INCREASE OF THESE STATE...
3. Conduction will increase
4. Convection will increase
Of
these
statements:
(a) 1, 2 and 3 are correct
(b) 1, 2 and 4 are correct
(c) 1, 3 and 4 are correct
(d) 2, 3 and 4 are correct
IES-37. A cube at high temperature is immersed in a constant temperature
bath. It loses heat from its top, bottom and side surfaces with heat
transfer coefficient of h
1
, h
2
and h
3
respectively. The average heat
transfer coefficient for the cube is:
[IES-1996]
1
1
1
(a)
h
1
+
h
3
+
h
3
(b)
(
h h h
1
3
3
)
1/3
(c)
h
+
h
+
h
(d) None of the above
1
2
3
IES-38. Assertion (A): When heat is transferred from a cylinder in cross flow to
an air stream, the local heat transfer coefficient at the forward
stagnation point is large.
[IES-1995]
Reason (R): Due to separation of the boundary layer eddies
continuously sweep the surface close to the forward stagnation point.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
IES-39. Match List-I (Flow pattern) with List-II (Situation) and select the
correct answer using the codes given below the lists:
[IES-1995]
Page 48 of 97
List-I List-II