Check Your Knowledge In HMT - Question Set 1
HEAT AND MASS TRANSFER
Heat and Mass Transfer is a peer-reviewed scientific journal published by Springer. It serves the circulation of new developments in the field of basic research of heat and mass transfer phenomena, as well as related material properties and their measurements. Thereby applications to engineering problems are promoted. The journal publishes original research reports.
HEAT AND MASS TRANSFER
1.The temperature distribution across a slab for conduction heat
transfer is ___________
exponential
nonlinear
constant
linear
nonlinear
constant
linear
2.The thermal conductivity of a material ___________
varies with thickness
varies with area
varies with temperature
remains constant always
varies with area
varies with temperature
remains constant always
3.The temperature gradient in an insulation material is _______
greater than in a conductor
less than in a conductor
equal to that in a conductor
zero
less than in a conductor
equal to that in a conductor
zero
4.At what temperature will the Celsius and Fahrenheit scales read
the same?
–40°C
+40°C
–25°C
+25°C
+40°C
–25°C
+25°C
5.What should be the temperature difference across a slab of thickness
1 m, having a thermal conductivity 0.1 W/m K, in order to obtain
a heat flux of 3 W/m2?
0.38°C
308°C
3008°C
1008°C
308°C
3008°C
1008°C
6.The convection heat transfer coefficient of a fluid depends on_________
thermal conductivity
fluid properties
fluid velocity
all of the above
fluid properties
fluid velocity
all of the above
7.The convection heat transfer rate, if the heat transfer coefficient
is 40 W/m2K and the temperature difference between the solid surface
area 1 m2) and the fluid remains at258°C, is ___________
kW
1.6 kW
0.4 kW
0.25 Kw
1.6 kW
0.4 kW
0.25 Kw
8.The emissivity of a real surface is always ___________
greater than unity
equal to unity
less than unity
less than or greater than unity
equal to unity
less than unity
less than or greater than unity
9.If the radiation heat transfer per unit area between two hot black bodies
is 116.1155 kW/m2 and the temperature of one hot body is 1200°C, then
the temperature of other body is ___________
10048°C
3008°C
9078°C
6008°C
3008°C
9078°C
6008°C
10.The radiation heat transfer per unit area between two black 9008°C and
408°C (in kW/m2) is ___________
1
10.7
107
1070
10.7
107
1070
