Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C
All of these
Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Film coefficient is defined as Inside diameter of tube

Equivalent thickness of film
Film coefficient × Inside diameter Thermal conductivity
Thermal conductivity Equivalent thickness of film Specific heat × Viscosity
Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

k.
(dT/dx)
k. (dx/dT)
(dx/dT)
k.
k. (dT/dx)

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Heat and Mass Transfer