CHAPTER 19

Question 1

When shutting down a hot oil system, the oil is circulated in order to prevent:
Select one:

A.
Uneven cooling of the oil

B.
Over-pressurization of the heater

C.
The oil from vaporizing

D.
Hot spots from forming

E.
Oil viscosity becoming too low

Answer 1

D.
Hot spots from forming

Question 2

During the annual inspection the hot oil heater tubes should be checked for signs of:
Select one:

A.
Gouging

B.
Scale buildup

C.
Caustic embrittlement

D.
Oxygen pitting

E.
Internal deposits

Answer 2

E.
Internal deposits

Question 2

Larger diameter piping (above 25.4 mm or 1 in) may be _____ pipe.
Select one:

A.
Schedule 80

B.
Double extra strong

C.
Schedule 1600

D.
Schedule 40

E.
Strong

Answer 2

D.
Schedule 40

Question 3

Oils intended for use as heat transfer fluid in a hot oil system should:
Select one:

A.
Be corrosive to metals used in the system

B.
Have a high vapour pressure at operating temperature

C.
Possess low heat transfer characteristics

D.
Resist thermal breakdown at normal operating temperatures

E.
Have a high viscosity

Answer 3

D.
Resist thermal breakdown at normal operating temperatures

Question 4

Hot oil may coke in the heater tubes if:
Select one:

A.
Furnace temperature drops too low

B.
Oil flow rate is too high

C.
Stack temperature gets too high

D.
Oil temperature exceeds 350°C (662°F)

E.
A tube should develop a leak

Answer 4

D.
Oil temperature exceeds 350°C (662°F)

Question 5

The oil temperature is controlled by the:
Select one:

A.
Temperature required by the process

B.
Process requirements

C.
Pressure required by the process

D.
Firing rate in the furnace

E.
Volume of material produced

Answer 5

D.
Firing rate in the furnace

Question 6

During the annual inspection the hot oil heater tubes should be checked for signs of:
Select one:

A.
Scale buildup

B.
Gouging

C.
Oxygen pitting

D.
Flame impingement

E.
Caustic embrittlement

Answer 6

D.
Flame impingement

Question 7

The inner walls and floor are lined with:
Select one:

A.
Insulation

B.
Refractory brick

C.
Plain tubes

D.
Steel sheets

E.
Finned tubes

Answer 7

B.
Refractory brick

Question 8

On the fuel gas system to a hot oil heater, the acronym, PRV, stands for:
Select one:

A.
Pressure regulating valve

B.
Primary relief valve

C.
Primary regulating valve

D.
Pressure restricting valve

E.
Pressure relief valve

Answer 8

A.
Pressure regulating valve

Question 9

While the hot oil heater refractory is being dried out the oil circulating in the tubes should be limited to a temperature rise of not more than _____ per hour.
Select one:

A.
30°C

B.
60°C

C.
55°C

D.
35°C

E.
25°C

Answer 9

C.
55°C

Question 10

Oils intended for use as heat transfer fluid in a hot oil system should:
Select one:

A.
Have a high vapour pressure at operating temperature

B.
Have a high viscosity

C.
Be corrosive to metals used in the system

D.
Resist thermal breakdown at low operating temperatures

E.
Possess high heat transfer characteristics

Answer 10

E.
Possess high heat transfer characteristics

Question 11

The type of hot oil system heater which is most efficient is the:
Select one:

A.
Combined radiation and convection

B.
Combined conduction and radiation

C.
Radiant

D.
Combined conduction and convection

E.
Convection

Answer 11

A.
Combined radiation and convection

Question 11

Clean steam may be used in:
Select one:

A.
Chemical processes

B.
Sterilization systems

C.
Gas plants

D.
Oil Refineries

E.
Steam cleaning

Answer 11

B.
Sterilization systems

Question 12

One of the weaknesses of the gas turbine is its:
Select one:

A.
Weight to power ratio

B.
Startup time

C.
Reciprocating motion

D.
Heavy weight

E.
Thermal efficiency

Answer 12

E.
Thermal efficiency

Question 13

With reference to hot oil systems the acronym AFV stands for:
Select one:

A.
Accelerated fuel valve

B.
After fuel valve

C.
Automatic fuel valve

D.
After flow valve

E.
Automatic flow valve

Answer 13

C.
Automatic fuel valve

Question 14

A hot oil heating system is similar in principle to:
Select one:

A.
A firetube boiler burner

B.
A hot water heating system

C.
A condensate return system

D.
A steam heating system

E.
An oil refinery

Answer 14

B.
A hot water heating system

Question 15

Depending upon the size of the hot oil heater, it may have anywhere from 2 to _____ burners.
Select one:

A.
20

B.
10

C.
30

D.
15

E.
25

Answer 15

A.
20

Question 16

Clean steam may be used in:
Select one:

A.
Gas plants

B.
Steam cleaning

C.
Chemical processes

D.
Oil Refineries

E.
Humidification systems

Answer 16

E.
Humidification systems

Question 17

Clean steam is steam that is generated from _____ as its feed water.
Select one:

A.
Water corrosion control chemicals

B.
Water containing oxygen scavengers

C.
Condensate

D.
Water anti-scaling compounds

E.
De-ionized or distilled water

Answer 17

E.
De-ionized or distilled water

Question 18

The refractory brick of the hot oil heater should be inspected for:
Select one:

A.
Density

B.
Consistency

C.
Abnormal cracks

D.
Hardness

E.
Colour

Answer 18

C.
Abnormal cracks

Question 19

A hot oil system is one that uses a _____ to conduct heat from a central source to other vessels and heating coils in a plant.
Select one:

A.
Steam

B.
Hot water

C.
Thermal fluid

D.
Liquid salt

E.
Hot air

Answer 19

C.
Thermal fluid

Question 20

_____ extinguishing agents should be used to extinguish burning hot oil.
Select one:

A.
Foam or dry chemical

B.
Carbon dioxide

C.
Dry powder

D.
Water based

E.
Halogen

Answer 20

A.
Foam or dry chemical

Question 21

Clean steam may be used in:
Select one:

A.
Vacuum forming systems

B.
Oil Refineries

C.
Chemical processes

D.
Steam cleaning

E.
Gas plants

Answer 21

A.
Vacuum forming systems

Question 22

Radiant type oil heaters for a hot oil system have:
Select one:

A.
Efficiencies of about 40 to 50%

B.
Mechanical draft combustion systems

C.
An efficiency of about 75 to 85%

D.
Tubes containing fins on their inner surfaces

E.
Combustion gases flowing inside tubes

Answer 22

A.
Efficiencies of about 40 to 50%

Question 23

Convection type oil heaters for a hot oil system have:
Select one:

A.
Mechanical draft combustion systems

B.
Efficiencies of about 40 to 50%

C.
Tubes containing fins on their inner surfaces

D.
Combustion gases flowing inside tubes

E.
An efficiency of about 75 to 85%

Answer 23

E.
An efficiency of about 75 to 85%

Question 24

A _____ surrounds the foundation to prevent hot oil from spreading beyond the immediate confines of the heater in the event of a tube rupture.
Select one:

A.
Moat

B.
Concrete dike

C.
Wooden dyke

D.
Steel wall

E.
Earthen wall

Answer 24

B.
Concrete dike

Question 25

Clean steam may be used in:
Select one:

A.
Chemical processes

B.
Steam cleaning

C.
Oil Refineries

D.
Gas plants

E.
Direct heating by steam injection

Answer 25

E.
Direct heating by steam injection

Question 26

Oils intended for use as heat transfer fluid in a hot oil system should:
Select one:

A.
Be non-corrosive to metals used in the system

B.
Resist thermal breakdown at low operating temperatures

C.
Have a high viscosity

D.
Possess low heat transfer characteristics

E.
Have a high vapor pressure at operating temperature

Answer 26

A.
Be non-corrosive to metals used in the system

Question 27

Overheated oil will break down forming a solid mass of carbon called:
Select one:

A.
Carbon

B.
Coke

C.
Graphite

D.
Steel

E.
Coal

Answer 27

B.
Coke

Question 28

Flanges used in hot oil systems should be raised face and suitable _____ gaskets should be used.
Select one:

A.
Graphite/asbestos

B.
Metallic

C.
Garlock

D.
Cork

E.
Rubber

Answer 28

B.
Metallic