Question 1

What should process technicians routinely check when performing monitoring and maintenance activities?&#10;A) Excess vibration&#10;B) Low oil levels&#10;C) High temperatures&#10;D) All of the above

Accepted Answer

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?&#10;A) Leaks&#10;B) Surging&#10;C) Overpressurization&#10;D) Rotating Equipment

Accepted Answer

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?&#10;A) Axial&#10;B) Rotary&#10;C) Centrifugal&#10;D) Dynamic

Accepted Answer

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?&#10;A) They have a smaller capacity&#10;B) They are more readily available&#10;C) They require less maintenance&#10;D) They are more expensive

Accepted Answer

A) Incorrect. Dynamic compressors are more commonly used than positive-displacement compressors because they have a larger capacity and require less maintenance. They also can be less expensive and more efficient, depending on the service application.
B) Incorrect. Dynamic compressors are more commonly used than positive-displacement compressors because they have a larger capacity and require less maintenance. They also can be less expensive and more efficient, depending on the service application.
C) Correct. Dynamic compressors are more commonly used than positive-displacement compressors because they have a larger capacity and require less maintenance. They also can be less expensive and more efficient, depending on the service application.
D) Incorrect. Dynamic compressors are more commonly used than positive-displacement compressors because they have a larger capacity and require less maintenance. They also can be less expensive and more efficient, depending on the service application.

Question 5

What occurs if the valves associated with the compressor are incorrectly closed or blocked?&#10;A) Surging&#10;B) Leakage&#10;C) Overheating&#10;D) Overpressurization

Accepted Answer

A) Incorrect. Surging is a temporary loss of flow to one or more impellers or stages of the compressor.
B) Incorrect. Leaks can introduce harmful or hazardous substances into the atmosphere, create process problems, and create an unsafe work area for employees.
C) Incorrect. Compressor overheating often is caused by improper lubrication.
D) Correct. Overpressurization occurs if the valves associated with the compressor are incorrectly closed or blocked.

Question 6

Which of the following is an example of a rotary compressor?&#10;A) Scroll&#10;B) Axial&#10;C) Diaphragm&#10;D) Centrifugal

Accepted Answer

A) Correct. A scroll is an example of a rotary compressor.
B) Incorrect. An axial is an example of a dynamic compressor.
C) Incorrect. A diaphragm is an example of a reciprocating compressor.
D) Incorrect. A centrifugal is an example of a dynamic compressor.

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)?&#10;A) Axial&#10;B) Rotary&#10;C) Reciprocating&#10;D) Positive-displacement

Accepted Answer

A) Incorrect. An axial compressor uses a series of rotor blades with a set of stator blades between each rotating wheel to move gases axially along the shaft.
B) Incorrect. A rotary compressor is a positive-displacement compressor that uses a rotating motion to move gases.
C) Correct. A reciprocating 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).
D) Incorrect. Positive-displacement compressors use screws, pistons, sliding vanes, lobes, gears, or diaphragms to deliver a set volume of gas with each stroke.

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?&#10;A) Dynamic&#10;B) Centrifugal&#10;C) Axial&#10;D) Positive-displacement

Accepted Answer

A) Incorrect. A dynamic compressor is a continuous flow machine that uses speed (instead of pistons) to increase the pressure of gas at the discharge.
B) Correct. A centrifugal 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.
C) Incorrect. An axial compressor uses a series of rotor blades with a set of stator blades between each rotating wheel to move gases axially along the shaft.
D) Incorrect. Positive-displacement compressors use screws, pistons, sliding vanes, lobes, gears, or diaphragms to deliver a set volume of gas with each stroke.

Question 9

Which of the following is a main component of an axial compressor?&#10;A) Impeller&#10;B) Diffuser&#10;C) Rotor blades&#10;D) Housing

Accepted Answer

A) Incorrect. The main components of an axial compressor are suction (inlet), inlet guide vanes, shaft, rotor blades, stator blades, and discharge (outlet).
B) Incorrect. The main components of an axial compressor are suction (inlet), inlet guide vanes, shaft, rotor blades, stator blades, and discharge (outlet).
C) Correct. The main components of an axial compressor are suction (inlet), inlet guide vanes, shaft, rotor blades, stator blades, and discharge (outlet).
D) Incorrect. The main components of an axial compressor are suction (inlet), inlet guide vanes, shaft, rotor blades, stator blades, and discharge (outlet).

Question 10

Which of the following is a main component of a reciprocating compressor?&#10;A) Lobe&#10;B) Gears&#10;C) Vanes&#10;D) Counterweight

Accepted Answer

A) Incorrect. The main components of a reciprocating compressor are housing, inlet (suction), outlet (discharge), piston, piston rod or connecting rod, shaft, counterweight, and valves.
B) Incorrect. The main components of a reciprocating compressor are housing, inlet (suction), outlet (discharge), piston, piston rod or connecting rod, shaft, counterweight, and valves.
C) Incorrect. The main components of a reciprocating compressor are housing, inlet (suction), outlet (discharge), piston, piston rod or connecting rod, shaft, counterweight, and valves.
D) Correct. The main components of a reciprocating compressor are housing, inlet (suction), outlet (discharge), piston, piston rod or connecting rod, shaft, counterweight, and valves.

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?&#10;A) Dynamic&#10;B) Centrifugal&#10;C) Axial&#10;D) Positive-displacement

Accepted Answer

The answer of What type of compressor uses screws, pistons,...

Question 12

Which of the following is an example of a reciprocating compressor?&#10;A) Lobe&#10;B) Screw&#10;C) Liquid ring&#10;D) Double-acting piston

Accepted Answer

The answer of Which of the following is an example...

Question 13

Why are centrifugal compressors the most common in process industries?&#10;A) They deliver lower flow rates&#10;B) They are more economical&#10;C) They take up more space&#10;D) They have a higher capacity

Accepted Answer

The answer of Why are centrifugal compressors the most common...

Question 14

What is the opening of necessary valves in a piping system prior to placing a device in service?&#10;A) Suction&#10;B) Discharge&#10;C) Line-up&#10;D) Centrifugal

Accepted Answer

The answer of What is the opening of necessary valves...

Question 15

What is the primary function of a compressor?&#10;A) Regulate the pressure of gases for use in a facility&#10;B) Increase the pressure of gases for use in a facility&#10;C) Decrease the pressure of gases for use in a facility&#10;D) Expand gases for use in a facility

Accepted Answer

The answer of What is the primary function of a...

Question 16

What happens in a centrifugal compressor when the impeller spins?&#10;A) It decreases the velocity of the gas&#10;B) It increases the velocity of the gas&#10;C) It stabilizes the velocity of the gas&#10;D) It changes the structure of the gas

Accepted Answer

The answer of What happens in a centrifugal compressor when...

Question 17

What type of compressor uses a rotating motion to move gases?&#10;A) Axial&#10;B) Rotary&#10;C) Reciprocating&#10;D) Positive-displacement

Accepted Answer

The answer of What type of compressor uses a rotating...

Question 18

Which of the following is a main component of a rotary compressor?&#10;A) Lobe&#10;B) Piston&#10;C) Valves&#10;D) Counterweight

Accepted Answer

The answer of Which of the following is a main...

Question 19

What type of compressor uses speed, or kinetic energy, to increase the pressure of gases?&#10;A) Dynamic compressors&#10;B) Positive-displacement compressors&#10;C) Process compressors&#10;D) Accelerator compressors

Accepted Answer

The answer of What type of compressor uses speed, or...

Question 20

Which of the following can cause a possible individual impact of retraining?&#10;A) Leaks&#10;B) Surging&#10;C) Overheating&#10;D) Rotating Equipment

Accepted Answer

The answer of Which of the following can cause a...

Question 21

Which of the following is the symbol for a rotary compressor?&#10;A)  &#10;B)  &#10;C)  &#10;D)

Accepted Answer

The answer of Which of the following is the symbol...

Question 22

Which of the following is the symbol for an axial compressor?&#10;A)  &#10;B)  &#10;C)  &#10;D)

Accepted Answer

The answer of Which of the following is the symbol...

Deck 17: Compressors