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Definitions and Basic Concepts Online Exam Quiz

Important questions about Definitions and Basic Concepts. Definitions and Basic Concepts MCQ questions with answers. Definitions and Basic Concepts exam questions and answers for students and interviews.

Consider system A at uniform temperature t and system B at another uniform temperature T (t > T). Let the two systems be brought into contact and be thermally insulated from their surroundings but not from each other. Energy will flow from system A to system B because of


A : a. Temperature difference

B : b. Energy difference

C : c. Mass difference

D : d. Volumetric difference

The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there?


A : a. One

B : b. Two

C : c. Three

D : d. Four

An oil cooler in a high performance engine has an outside surface area 0.12 m² and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m² K. Find out the heat transfer rate?


A : a. 238.43 W

B : b. 190.68 W

C : c. 543.67 W

D : d. 675.98 W

Unit of rate of heat transfer is


A : a. Joule

B : b. Newton

C : c. Pascal

D : d. Watt

Convective heat transfer coefficient doesn’t depend on


A : a. Surface area

B : b. Space

C : c. Time

D : d. Orientation of solid surface

The rate equation used to describe the mechanism of convection is called Newton’s law of cooling. So rate of heat flow by convection doesn’t depend on


A : a. Convective heat transfer coefficient

B : b. Surface area through which heat flows

C : c. Time

D : d. Temperature potential difference

How many types of convection process are there?


A : a. One

B : b. Three

C : c. Four

D : d. Two

Thermal conductivity is maximum for which substance


A : a. Silver

B : b. Ice

C : c. Aluminum

D : d. Diamond

A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body


A : a. 697.2 W/m²

B : b. 786.9 W/m²

C : c. 324.7 W/m²

D : d. 592.1 W/m²

Which of the following is an example of forced convection?


A : a. Chilling effect of cold wind on a warm body

B : b. Flow of water in condenser tubes

C : c. Cooling of billets in the atmosphere

D : d. Heat exchange on cold and warm pipes

Regarding one dimensional heat transfer, choose the correct statement


A : a. Steady- f (x), Unsteady- f (x, t)

B : b. Steady- f (x, t), Unsteady- f (x)

C : c. Steady- f (x, y, t), Unsteady- f (x)

D : d. Steady- f (y, z), Unsteady- f (y)

Which statement is true regarding steady state condition?


A : a. There is a variation in temperature in the course of time

B : b. Heat exchange is constant

C : c. It is a function of space and time coordinates

D : d. Internal energy of the system changes

Which of the following is an example of steady state heat transfer?


A : a. Boilers and turbines

B : b. Cooling of I.C engine

C : c. Chilling effect of cold wind on a warm body

D : d. Electric bulb cools down by the surrounding atmosphere

Heat transfer in a long, hollow cylinder which is maintained at uniform but different temperatures on its inner and outer surfaces may be assumed to be taking place in which direction?


A : a. Axial only

B : b. Unpredictable

C : c. Radial only

D : d. No heat transfer takes place

Heat transfer takes place according to which law?


A : a. Newton’s law of cooling

B : b. Second law of thermodynamics

C : c. Newton’s second law of motion

D : d. First law of thermodynamics

Heat transfer takes place in liquids and gases is essentially due to


A : a. Radiation

B : b. Conduction

C : c. Convection

D : d. Conduction as well as convection

The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by


A : a. Newton’s first law

B : b. Wein’s displacement law

C : c. Kirchhoff’s law

D : d. Newton’s law of cooling

Identify the wrong statement.


A : a. The process of heat transfer is an irreversible process

B : b. For heat exchange, a temperature gradient must exist

C : c. A material medium is not necessary for heat transmission

D : d. Heat flow doesn’t depends on temperature

During a cold winter season, a person prefers to sit near a fire. Which of the following modes of heat transfer provides him the maximum heat?


A : a. Conduction from the fire

B : b. If it is near the fire, convection sounds good

C : c. Convection and radiation together

D : d. Radiation will provide quick warmth

Most unsteady heat flow occurs


A : a. Through the walls of the refrigerator

B : b. During annealing of castings

C : c. Through the walls of the furnace

D : d. Through lagged pipe carrying steam

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