Heat & Mass Transfer MCQ Questions Answers – Mechanical Engineering
1) Which of the following material has least thermal conductivity at room temperature ?
a) Human Skin
b) Urethane
c) Wood
d) Brick
2)Heat transfer from one place to another takes place through
a) conduction
b) convection
c) radiation
d) all of above
3) Thermal conductivity of wood depends on
a) moisture
b) density
c) temperature
d) All of these
4)Overall heat transfer coefficient is associated with
(a) Conduction and radiation
(b) Convection and radiation
(c) Radiation, convection and conduction
(d) None
5) The unit of thermal diffusivity is
a) m2/hr0C
b) kJ/m2hr
c) m/hr0C
d) m2/hr
6)Radiation heat flux is
(a) σ A T4
(b) σ A dT
(c) σ T4
(d) None
7) In which of the following material non-isotropic conductivity is exhibited
a) Lead
b) Wood
c) Copper
d) Brass
8)Temperature variation in a pipe is
(a) linear
(b) Parabolic
(c) logarithmic
(d) None
9) Heat transfer by molecular collision in
a) conduction
b) convection
c) radiation
d) scattering
10)The amount of heat required to raise temperature of a substance by …………..
1°C
1°F
10°C
10°F