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Heat And Mass Transfer MCQ Questions & Answers | Mechanical Engineering

Learn Heat And Mass Transfer MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Heat And Mass Transfer MCQ question is the important chapter for a Mechanical Engineering and GATE students.

Each section contains 100 MCQs on Heat and Mass Transfer .
1
All radiations in a black body are
Discuss
Answer & Solution
Answer: Option D
Solution:
an object that absorbs all radiation falling on it, at all wavelengths, is called a black body. When a black body is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature. Its emission is called black-body radiation.
2
The heat is transferred by conduction, convection and radiation in
Discuss
Answer & Solution
Answer: Option B
Solution:
The heat is transferred by conduction, convection and radiation in Boiler Furnaces
3
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
Discuss
Answer & Solution
Answer: Option C
Solution:
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in Boiler
4
The radiation emitted by a black body is known as
Discuss
Answer & Solution
Answer: Option D
Solution:
When a black body is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature. Its emission is called black-body radiation
5
The amount of heat flow through a body by conduction is
Discuss
Answer & Solution
Answer: Option D
Solution:
The amount of heat flow through a body by conduction is - Directly proportional to the surface area of the body - Directly proportional to the temperature difference on the two faces of the body - Dependent upon the material of the body
6
The emissive power of a body depends upon its
Discuss
Answer & Solution
Answer: Option D
Solution:
According to wein's displacement law, Emissive power from black body is a function of temperature. So, we can say that emissive power depends on temperature and wavelength.
7
The amount of radiation mainly depends upon the
Discuss
Answer & Solution
Answer: Option D
Solution:
Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object It depends on nature of the body, its temperature and kind & extent of its surface.
8
Film coefficient is defined as Inside diameter of tube
Discuss
Answer & Solution
Answer: Option B
Solution:
Film coefficient is defined as Inside diameter of tube Thermal conductivity Equivalent thickness of film Specific heat × Viscosity
9
Thermal diffusivity is a
Discuss
Answer & Solution
Answer: Option B
Solution:
Thermal diffusivity is a measure of the transient thermal response of a material to a change in temperature
10
The most commonly used method for the design of duct size is the
Discuss
Answer & Solution
Answer: Option C
Solution:
Static regain is the third sizing method for ductwork included in Design Master HVAC. The calculation works by keeping the static pressure in the ductwork constant throughout the system.