Deck 19: Pressure and Confined Space Hazards

Question 1

The most effective preventive measure for overcoming potential pressure hazards is proper design.

Answer 1

True

Question 2

Confined spaces are hazardous because of the potential to trap toxic and/or explosive vapors and gases.

Answer 2

True

Question 3

Pressure is the force exerted against an opposing fluid or thrust distributed over a surface.

Answer 3

True

Question 4

Which of the following is not an inert gas?

A) Helium
B) Argon
C) Krypton
D) Xenon
E) Oxygen

Question 5

Approximately 79% of the atmosphere is oxygen, with the other 21% being nitrogen.

Question 6

A boiler is an open vessel in which water is heated to form steam, hot water, or high temperature water under pressure.

Question 7

A confined space is any area with limited means of entry and exit that is large enough for a person to fit into but is not designed for occupancy.

Question 8

To reduce pressure hazards, keep pressurized hoses as short as possible.

Question 9

Dalton's law states that the product of a given pressure and volume is constant with a constant temperature.

Question 10

Which of the following is not a safety hazard associated with boilers and other pressurized vessels?

A) Helium
B) Argon
C) Krypton
D) Xenon
E) Oxygen

Question 11

A confined space with a concentration of flammable gasses below the lower flammable limit (LFL) is a safe working environment.

Question 12

We perceive pressure in relation to the earth's atmosphere.

Question 13

A swift return to the surface from diving or decompression during high-altitude flight may cause lung rupture.

Question 14

Water vapor, although it is a gas, does not conform to which of the following?

A) Boyle's law
B) CSA standards
C) ASME codes
D) Dalton's law
E) Container dimensions

Question 15

What device is used to measure atmospheric pressure?

A) Pressure vessel
B) Ultrasound meter
C) Barometer
D) Vacuum gauge
E) Proof pressure meter

Question 16

Ultrasonic and X-ray waves are forms of destructive testing methods used to detect cracks or leaks.

Question 17

Which of the following situations may cause a vacuum?

A) Shock waves
B) Pressures below the atmospheric level
C) High-temperature water
D) Ultrasonic waves
E) Excessive air exchanged in a container

Question 18

Trapped gas effects are commonly known as "the bends."

Question 19

Radiocraphic tests are referred to as surface tests.

Question 20

Hyperoxia results in too little oxygen getting to body tissues.

Question 21

Which of the following are examples of confined space?

A) Vaults
B) Silos
C) Train compartments
D) Sewers
E) All of the above

Question 22

Which of the following not-destructive testing methods is referred to as a volumetric test?

A) Radiography
B) Visual
C) Liquid penetration
D) Magnetic particle
E) Pressure test

Question 23

What is an adequate amount of oxygen present in a confined space before entering with a non-supplied air respirator?

A) Between 1 and 2%
B) Between 2 and 4%
C) Between 4 and 8%
D) Between 10 and 16%
E) Between 18 and 22%

Question 24

Before entering a confined space to do a 3 to 5 minute valve replacement, samples are taken of the air inside. The following data is known about the gases present: TLV = 100 ppm
LFL = 500 ppm
UFL = 2000 ppm
Actual concentration measured = 2100 ppm
What would be considered a safe concentration?

A) Below 50 ppm
B) Below 100 ppm
C) Below 500 ppm
D) Above 2000 ppm
E) Above 2100 ppm

Question 25

Which of the following actions should be taken before entering a confined space?

A) Shut down equipment
B) Test the atmosphere
C) Ventilate the space
D) Attach a lifeline
E) All of the above