The unit of overall coefficient of heat transfer is
Select an option to see the answer and solution.
Mechanical Engineering · all questionsHeat And Mass Transfer
Heat And Mass Transfer
practice.
Practice every MCQ with options. Use Show answers when you want the correct option and solution.
163
Questions
2/9
Page
Pick an option on a question to see the right answer and solution.
Unit of thermal conductivity in S.I. units is
Select an option to see the answer and solution.
According to Wien's law, the wavelength corresponding to maximum energy is proportion to
Select an option to see the answer and solution.
Which of the following has least value of conductivity?
Select an option to see the answer and solution.
According to Prevost theory of heat exchange
Select an option to see the answer and solution.
Conduction is a process of heat transfer
Select an option to see the answer and solution.
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air and pv = Partial pressure of water vapour)
Select an option to see the answer and solution.
A composite slab has two layers of different materials with thermal conductivities k1 and k2. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be
Select an option to see the answer and solution.
Total emissivity of polished silver compared to black body is
Select an option to see the answer and solution.
Depending on the radiating properties, a body will be black when
(Where a = absorptivity, p = reflectivity, x = transmissivity.)
(Where a = absorptivity, p = reflectivity, x = transmissivity.)
Select an option to see the answer and solution.
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called
Select an option to see the answer and solution.
The rate of heat flow through a body is The term is known as
Select an option to see the answer and solution.
Depending on the radiating properties, a body will be white when
(Where a = absorptivity, p = reflectivity, x = transmissivity)
(Where a = absorptivity, p = reflectivity, x = transmissivity)
Select an option to see the answer and solution.
Depending on the radiating properties, body will be transparent when
(Where a = absorptivity, p = reflectivity, x = transmissivity)
(Where a = absorptivity, p = reflectivity, x = transmissivity)
Select an option to see the answer and solution.
The expression Q = ρ AT4 is called
Select an option to see the answer and solution.
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by
Select an option to see the answer and solution.
The time constant of a thermocouple is
Select an option to see the answer and solution.
The total emissivity power is defined as the total amount of radiation emitted by a black body per unit
Select an option to see the answer and solution.
Heat transfer takes place as per
Select an option to see the answer and solution.
Thermal diffusivity is
Select an option to see the answer and solution.