Deck 17: Compressors

Question 1

What should process technicians routinely check when performing monitoring and maintenance activities?

A) Excess vibration
B) Low oil levels
C) High temperatures
D) All of the above

Answer 1

D
Explanation: A) Incorrect. Technicians must routinely check for excess vibration, correct oil flow, correct oil level, and that temperatures and pressures are in range.
B) Incorrect. Technicians must routinely check for excess vibration, correct oil flow, correct oil level, and that temperatures and pressures are in range.
C) Incorrect. Technicians must routinely check for excess vibration, correct oil flow, correct oil level, and that temperatures and pressures are in range.
D) Correct. Technicians must routinely check for excess vibration, correct oil flow, correct oil level, and that temperatures and pressures are in range.

Question 2

Which of the following can cause a possible equipment impact of high vibration?

A) Leaks
B) Surging
C) Overpressurization
D) Rotating Equipment

Answer 2

B
Explanation: A) Incorrect. Leaks can cause possible damage to component part or compromise of a component such as a seal.
B) Correct. Surging can cause high vibration possible leading to separation of equipment or damage to internal components.
C) Incorrect. Overpressurization can cause leaks at seals, valves, and other component parts.
D) Incorrect. Rotating equipment can cause possible damage to both the compressor and driver end equipment.

Question 3

Which of the following is a category of positive-displacement compressors?

A) Axial
B) Rotary
C) Centrifugal
D) Dynamic

Answer 3

B
Explanation: A) Incorrect. The two main categories of positive-displacement compressors are rotary and reciprocating.
B) Correct. The two main categories of positive-displacement compressors are rotary and reciprocating.
C) Incorrect. The two main categories of positive-displacement compressors are rotary and reciprocating.
D) Incorrect. The two main categories of positive-displacement compressors are rotary and reciprocating.

Question 4

Why are dynamic compressors more commonly used than positive-displacement compressors?

A) They have a smaller capacity
B) They are more readily available
C) They require less maintenance
D) They are more expensive

Question 5

What occurs if the valves associated with the compressor are incorrectly closed or blocked?

A) Surging
B) Leakage
C) Overheating
D) Overpressurization

Question 6

Which of the following is an example of a rotary compressor?

A) Scroll
B) Axial
C) Diaphragm
D) Centrifugal

Question 7

What type of compressor uses the inward stroke of a piston or diaphragm to draw gas into a chamber (intake) and then positively displace the gas using an outward stroke (discharge)?

A) Axial
B) Rotary
C) Reciprocating
D) Positive-displacement

Question 8

What type of compressor is a dynamic compressor in which the gas flows from the inlet located near the suction eye to the outer tip of the impeller blade?

A) Dynamic
B) Centrifugal
C) Axial
D) Positive-displacement

Question 9

Which of the following is a main component of an axial compressor?

A) Impeller
B) Diffuser
C) Rotor blades
D) Housing

Question 10

Which of the following is a main component of a reciprocating compressor?

A) Lobe
B) Gears
C) Vanes
D) Counterweight

Question 11

What type of compressor uses screws, pistons, sliding vanes, lobes, gears, or diaphragms to deliver a set volume of gas with each stroke?

A) Dynamic
B) Centrifugal
C) Axial
D) Positive-displacement

Question 12

Which of the following is an example of a reciprocating compressor?

A) Lobe
B) Screw
C) Liquid ring
D) Double-acting piston

Question 13

Why are centrifugal compressors the most common in process industries?

A) They deliver lower flow rates
B) They are more economical
C) They take up more space
D) They have a higher capacity

Question 14

What is the opening of necessary valves in a piping system prior to placing a device in service?

A) Suction
B) Discharge
C) Line-up
D) Centrifugal

Question 15

What is the primary function of a compressor?

A) Regulate the pressure of gases for use in a facility
B) Increase the pressure of gases for use in a facility
C) Decrease the pressure of gases for use in a facility
D) Expand gases for use in a facility

Question 16

What happens in a centrifugal compressor when the impeller spins?

A) It decreases the velocity of the gas
B) It increases the velocity of the gas
C) It stabilizes the velocity of the gas
D) It changes the structure of the gas

Question 17

What type of compressor uses a rotating motion to move gases?

A) Axial
B) Rotary
C) Reciprocating
D) Positive-displacement

Question 18

Which of the following is a main component of a rotary compressor?

A) Lobe
B) Piston
C) Valves
D) Counterweight

Question 19

What type of compressor uses speed, or kinetic energy, to increase the pressure of gases?

A) Dynamic compressors
B) Positive-displacement compressors
C) Process compressors
D) Accelerator compressors

Question 20

Which of the following can cause a possible individual impact of retraining?

A) Leaks
B) Surging
C) Overheating
D) Rotating Equipment

Question 21

Which of the following is the symbol for a rotary compressor?

A)
B)
C)
D)

Question 22

Which of the following is the symbol for an axial compressor?

A)
B)
C)
D)