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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

Options

A : a. Temperature difference

B : b. Energy difference

C : c. Mass difference

D : d. Volumetric difference

Options

A : a. One

B : b. Two

C : c. Three

D : d. Four

Options

A : a. 238.43 W

B : b. 190.68 W

C : c. 543.67 W

D : d. 675.98 W

Options

A : a. Joule

B : b. Newton

C : c. Pascal

D : d. Watt

### Convective heat transfer coefficient doesn’t depend on

Options

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

Options

A : a. Convective heat transfer coefficient

B : b. Surface area through which heat flows

C : c. Time

D : d. Temperature potential difference

Options

A : a. One

B : b. Three

C : c. Four

D : d. Two

Options

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

Options

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?

Options

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

Options

### Which statement is true regarding steady state condition?

Options

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?

Options

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?

Options

A : a. Axial only

B : b. Unpredictable

D : d. No heat transfer takes place

### Heat transfer takes place according to which law?

Options

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

Options

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

Options

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.

Options

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?

Options

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

Options

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