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Heat transfer quiz-CH

Total questions: 50

Worksheet time: 45mins

Name
Class
Date
1.
What is the definition of CONDUCTION?
a)
When heat is transferred from objects like rays of light or electromagnetically.
b)
a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
c)
When heat transfers from objects that are touching.
d)
When heat transfers through the heater or AC in your house.
2.
What is the definition of CONVECTION
a)
When heat transfers through the heater or AC in your house.
b)
When heat transfers from objects that are touching.
c)
a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
d)
 hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
3.
What is the definition of RADIATION
a)
 hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
b)
When heat is transferred from objects like rays of light or electromagnetically.
c)
When heat transfers from objects that are touching.
d)
When heat transfers through the heater or AC in your house.
4.
What kind of heat transfer happens when the sun is heating your body?
a)
Conduction
b)
Radiation
c)
Convection
d)
Density
5.
What heat transfer happens when you burn your hand by touching a fire?
a)
Radiation
b)
Conduction
c)
Convectio
d)
I don't know!!!!!!!!!!!
6.
Heat transfers from an area of ____temperature to an area of ___ temperature.
a)
high to low
b)
low to high
c)
high to high
d)
It can travel high to low and low to high. 
7.
Warm air rises and the cool air sinks.
a)
conduction
b)
convection
c)
radiation
8.
The candle will slowly heat the metal and transfer the heat directly to the mans hand.
a)
conduction
b)
convection
c)
radiation
9.
The warm air from this heater creates a current when the warm air rises and the cold air sinks.
a)
conduction
b)
convection
c)
radiation
10.
What kind of heat transfer happens when the sun heats your body?
a)
Conduction
b)
Radiation
c)
Convection
d)
Density
11.
Warm air rises and the cool air sinks demonstrates this type of heat transfer. 
a)
conduction
b)
convection
c)
radiation
d)
Insolation 
12.
When you iron a shirt, the shirt gets warm.  This type of heat transfer is an example of
a)
condensation
b)
conduction
c)
convection
d)
radiation
13.
If two objects have different temperatures, heat will flow from the cooler object to the warmer one.
a)
True
b)
False
14.
Conduction is the transfer of thermal energy ___________.
a)
in the form of electromagnetic waves such as infrared radiation without the aid of a medium
b)
through a medium without any flow of the medium
c)
by means of convection currents in a fluid (liquid or gas), due to a difference in density
d)
None of the above
15.
List the correct order of conduction.
1. They collide more vigorously with neighbouring particles
2. Particles at the heated end gain kinetic energy and vibrate vigorously.
3. Particles at cooler end vibrate vigorously.
a)
1, 2, 3
b)
3, 2, 1
c)
2, 1, 3
d)
1, 3, 2
16.
Which material is the best conductor of heat?
a)
Wood
b)
Plastic
c)
Glass
d)
Steel
17.
Why do metals conduct thermal energy more quickly?
a)
Particles vibrate faster
b)
Due to the presence of bound electrons
c)
Due to the presence of free electrons
d)
Metals are grey
18.
Why are gases poor conductors of electricity?
a)
Particles are close together and collisions are more frequent
b)
Particles are far apart and collisions are less frequent
c)
Particles are close together and collisions are less frequent
d)
Particles are far apart and collisions are more frequent
19.
Which phase is the best conductor of heat?
a)
Solid
b)
Liquid
c)
Gas
20.
Which of the following is an application of conduction?
a)
Thermal energy from the Sun to Earth
b)
Pots having metals bodies and plastic handles
c)
Vacuum flasks having silver bodies
d)
Air conditioners cooling down a room
21.
What is the original source of most of the energy that people use?
a)
Energy that reaches Earth by radiation from the sun.
b)
Energy that reaches the earth by convection from the sun.
c)
Energy that reaches the earth by radiation from the core.
d)
Energy that reaches the earth by conduction from the core.
22.
A crayon placed on a dark driveway in bright sunlight melted into a colorful puddle. What caused the crayon to melt?
a)
Solar radiation heated the driveway and then heat transferred to the crayon by conduction.
b)
Solar radiation heated the driveway and then heat transferred to the crayon by radiation.
c)
Solar convection heated the driveway and then heat transferred to the crayon by radiation.
d)
Solar convection heated the driveway and then heat transferred to the crayon by conduction.
23.
How many kinds of heat transfer are there?
a)
1
b)
2
c)
3
d)
4 or more
24.

Which of the following is NOT a type of heat exchanger?

a)

Recuperator

b)

Regenerator

c)

Mixer

d)

none of the above

25.

The energy transfer between the hot fluid and cold fluids is brought about by their complete physical mixing in

a)

Direct contact heat exchanger

b)

Recuperators

c)

Regenerators

d)

Boilers

26.

In how many categories heat exchangers are classified on the basis of direction of flow of fluids?

a)

4

b)

3

c)

2

d)

1

27.

In how many categories heat exchangers are classified on the basis of physical state of heat exchanging fluids?

a)

1

b)

2

c)

3

d)

4

28.

The value of radiation coefficient or the Stefan-Boltzmann constant is

a)

5.67 * 10 -5 W/m2 K4

b)

5.67 * 10 -6 W/m2 K4

c)

5.67 * 10 -7 W/m2 K4

d)

5.67 * 10 -8 W/m2 K4

29.

Shell and Tube Heat Exchangers are not commonly used in industries because of their inability to handle high pressure and temperature.

a)

True

b)

False

30.

In how many categories heat exchangers are classified on the basis of direction of flow of fluids?

a)

4

b)

3

c)

2

d)

1

31.

The common types of heat exchangers:

a)

Shell and Tube Heat Exchanger

b)

Plate Heat Exchanger

c)

Crossflow Heat Exchanger

d)

Double Pipe Heat Exchanger

32.

Double pipe heat exchanger is suitable for large flow rate of fluid.

a)

True

b)

False

33.

What is the function of the corrugated plates in the plate heat exchanger?

a)

to increase the pressure drop in the heat transfer equipment

b)

to induce turbulence for improving heat transfer

c)

to induce laminar flow in heat exchanger

34.

Heat transfer is proportional to the overall heat transfer coefficient.

a)

True

b)

False

35.

If the temperatures of the hot and cold fluids at the outlet of exchanger are unknown, the heat transfer problem should be solving using:

a)

Fouling Factor Method

b)

Heat Exchanger Effectiveness (NTU Method)

c)

Correction Factor of LMTD Method

36.

Due to fouling phenomena in heat exchanger, the overall heat transfer coefficient become more

a)

higher than the clean condition.

b)

lower than the clean condition.

37.

Correction factor in Shell and Tube Heat Exchanger is applied for the following configurations:

a)

1 - 1 Shell and Tube Heat Exchanger

b)

1 - 2 Shell and Tube Heat Exchanger

c)

1 - 4 Shell and Tube Heat Exchanger

d)

2 - 4 Shell and Tube Heat Exchanger

38.

Log Mean Temperature Difference can be calculated if both fluids temperature at the inlet and outlet of heat exchanger are unknown.

a)

True

b)

False

39.

The number of tubes in Shell and Tube Heat Exchanger for dirty condition is higher than clean condition.

a)

True

b)

False

40.

What is the configuration of this exchanger?

a)

1 - 1 heat exchanger

b)

1 - 2 heat exchanger

c)

1 - 4 heat exchanger

d)

2 - 4 heat exchanger

41.

Which one of the answer does not reflect the characteristic of a heat exchanger?

a)

Allows heat from a fluid (a liquid or a gas) to pass to a second fluid

b)

An operation unit which consume high energy

c)

One of the concept to heat or cool buildings

d)

Helping engines and machines to work more efficiently

42.

These are the type of heat exchanger configurations available in the industry:

a)

Shell & Tube

b)

Plate & Frame

c)

Wall & Frame

d)

Cross Flow

43.

What are the calculation method can be used if the exit temperature of both fluids is unknown?

a)

Delta Tm

b)

Energy balance between Hot fluid and Cold fluid

c)

NTU method

d)

Fouling method

44.

If you are given the average velocity, mass flowrate and density of a fluid flowing in a tube, what are the parameters needed to be calculate in order to find the number of tubes in a given shell & tube heat exchanger?

a)

Surface area of the tube

b)

Cross section area of one tube

c)

Surface area of the total tubes

d)

Cross section area of the total tubes

45.

Name the type of configuration of this heat exchanger

a)

Plate and Tube

b)

Cross Flow with one fluid mixed, another fluid unmixed

c)

Cross flow with both fluid mixed

d)

Cross flow with both fluid unmixed

46.

Following are the factors that affecting the occurrence of fouling it the heat exchanger system, EXCEPT

a)

Increasing of the operating temperature

b)

Same type of fluid operated in the system

c)

The decreasing of the fluid velocity

d)

Length of the heat exchanger service

47.

Recognize the given Shell and Tube Heat Exchanger

a)

3-6 Shell and Tube

b)

2-4 Shell and Tube

c)

2-3 Shell and Tube

d)

1-2 Shell and Tube

48.

Which one of the following figures correctly represents counter-flow operation of a shell and tube heat exchanger with the specific heat of fluid in the shell side more than the fluid in the tube side?

a)
b)
c)
d)
49.

What can we infer from the name 2-4 Shell and Tube Heat Exchanger?

a)

Partition of the Shell into two and four passes of the tube

b)

Partition of the Shell into two three passes of the tube

c)

One Shell and Four pass of the tube

d)

Partition of the Shell into three four passes of the tube

50.

Which of the following statements are incorrect about Baffles in a Shell and Tube HE?

a)

Baffles provide mechanical support to the tubes and help them to be in position

b)

Baffles streamline the motion of the fluid in Shell side and hence decreases the turbulence

c)

The most common type of baffle is segmental baffles

d)

Baffles increase the overall heat transfer coefficient on the shell side

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