# Trivia Questions Quiz On Fluid Compressor Partners! Training

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Trivia Questions Quiz On Fluid Compressor Partners! The questions will cover what you learned in your training about the company and how ready you are to handle some of the questions surrounding the operations and products of the company. How much do you know about the gas compressors and pumps? Take the test to find out some more about them.

• 1.

### How many ratios is a compressor making with 14" hg vac suction and 188 PSIG discharge at sea level?

• A.

13.43

• B.

26.08

• C.

174

• D.

24.2

B. 26.08
Explanation
A compressor is making a ratio between the suction pressure and the discharge pressure. In this case, the suction pressure is given as 14" hg vac (vacuum) and the discharge pressure is given as 188 PSIG (pounds per square inch gauge). To calculate the ratio, we need to convert the suction pressure from vacuum to PSIG. Since 1 PSIG is equivalent to 2.036" hg vac, the suction pressure can be converted to -28.504 PSIG. Now we can calculate the ratio by dividing the discharge pressure by the suction pressure: 188 PSIG / -28.504 PSIG = -6.58. However, the absolute value of this ratio is taken, resulting in 6.58. Therefore, the correct answer is 26.08.

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• 2.

### What is an MSCFD?

• A.

One million standard cubic feet per day

• B.

Measure of standard coal fine density

• C.

Multi sectional carbon formation deposit

• D.

One thousand standard cubic feet per day

• E.

One hundred standard cubic feet per day

D. One thousand standard cubic feet per day
Explanation
An MSCFD is an abbreviation for "One thousand standard cubic feet per day." This unit of measurement is commonly used in the oil and gas industry to quantify the flow rate of natural gas. It represents the volume of gas that is produced or consumed per day at standard temperature and pressure conditions.

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• 3.

### For a constant load, if the voltage goes up, the current:

• A.

Goes up

• B.

Goes down

• C.

Is not relative to voltage

• D.

Cannot be measured

B. Goes down
Explanation
When the voltage goes up for a constant load, the current decreases. This is because according to Ohm's Law, the current is inversely proportional to the voltage. Therefore, as the voltage increases, the resistance of the load remains constant, causing the current to decrease.

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• 4.

### What happens to exhaust temp if a natural gas engine is leaned out?

• A.

It goes down

• B.

It goes up

• C.

It remains the same

• D.

It will fluctuate drastically

A. It goes down
Explanation
When a natural gas engine is "leaned out," it means that the air-fuel mixture is adjusted to have less fuel and more air. This adjustment leads to a decrease in the amount of fuel being burned, resulting in a lower combustion temperature. As a direct consequence, the exhaust temperature decreases. Therefore, the correct answer is "It goes down."

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• 5.

### A typical unit of measure for vacuum is inches of mercury vacuum. Approximately how many inches of mercury vacuum is equal to -3 psig (3 psi below atmospheric pressure)?

• A.

3" hg vac

• B.

6" hg vac

• C.

18" hg vac

• D.

There is no such thing as -3 psig

B. 6" hg vac
Explanation
The question asks for the equivalent measurement in inches of mercury vacuum for -3 psig, which means 3 psi below atmospheric pressure. The correct answer is 6" hg vac because -3 psig is equal to 6 inches of mercury vacuum.

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• 6.

### Why not keep a screw compressor operating with 140 deg F discharge temperature?

• A.

140 is hot enough to damage seals and o-rings

• B.

140 is too hot for proper sales meter readings

• C.

140 is cool enough to allow harmful condensation to form

• D.

140 is hot enough to scald human skin

C. 140 is cool enough to allow harmful condensation to form
Explanation
A screw compressor operates by compressing air or gas, which generates heat. If the discharge temperature is too low, it can cause condensation to form within the compressor. This condensation can mix with the lubricating oil and other contaminants, leading to corrosion, reduced efficiency, and potential damage to the compressor components. Therefore, it is important to maintain a discharge temperature that is high enough to prevent condensation from forming. 140 degrees Fahrenheit is considered cool enough to allow harmful condensation to form, making it an incorrect choice for keeping a screw compressor operating.

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• 7.

### What is a typical firing voltage for a spark plug in good condition?

• A.

12 volts

• B.

250 volts

• C.

300 to 400 millivolts

• D.

12,000 volts

D. 12,000 volts
Explanation
A typical firing voltage for a spark plug in good condition is 12,000 volts. This high voltage is necessary to create a spark that can ignite the air-fuel mixture in the engine cylinder. The spark plug acts as a bridge between the electrical system and the combustion chamber, and the high voltage helps to ensure a strong and consistent spark for efficient combustion.

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• 8.

### For the typical magnetic pick-up used in our equipment, how do you test for proper function?

• A.

Check for at least 2 volts AC

• B.

Check for at least 2 volts DC

• C.

Check for continuity to ground on the black wire

• D.

Check for at least 12 volts DC

A. Check for at least 2 volts AC
Explanation
To test for proper function of the typical magnetic pick-up used in the equipment, it is necessary to check for at least 2 volts AC. This is because the magnetic pick-up generates an alternating current (AC) signal as it senses the magnetic field. By checking for at least 2 volts AC, we can ensure that the pick-up is functioning correctly and producing the expected signal.

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• 9.

### Which pipe setup can flow more?

• A.

Two pipes, each 4" I.D.

• B.

One pipe, 6" I.D.

B. One pipe, 6" I.D.
Explanation
The larger the diameter of a pipe, the greater its capacity to flow. In this case, the 6" I.D. pipe has a larger diameter than the two 4" I.D. pipes. Therefore, the 6" I.D. pipe can flow more than the two 4" I.D. pipes.

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• 10.

### How many MSCFD is "2.5 million per day"?

• A.

2.5

• B.

0.25

• C.

2500

• D.

2,500,000

C. 2500
Explanation
The correct answer is 2500. MSCFD stands for "thousand standard cubic feet per day." Therefore, "2.5 million per day" can be converted to 2,500 MSCFD by dividing 2.5 million by 1000.

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• 11.

### Which wire size is bigger?

• A.

18 awg

• B.

14 awg

B. 14 awg
Explanation
The wire size is determined by the American Wire Gauge (AWG) system, where a smaller gauge number represents a larger wire size. Therefore, the 14 AWG wire is bigger than the 18 AWG wire.

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• 12.

### A Murphy L1200 liquid level switch is a:

• A.

Pneumatic end device

• B.

Digital end device

• C.

Analog end device

• D.

None of the above

B. Digital end device
Explanation
A Murphy L1200 liquid level switch is classified as a digital end device because it uses digital technology to detect and measure the level of liquid. Unlike pneumatic end devices that rely on air pressure or analog end devices that use continuous signals, the Murphy L1200 switch operates using discrete digital signals to indicate whether the liquid level is above or below a certain threshold. This makes it more precise and accurate in its measurements, making it suitable for various industrial applications where precise liquid level monitoring is required.

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• 13.

### A 4-20 mA pressure transducer is as a:

• A.

Pneumatic end device

• B.

Digital end device

• C.

Analog end device

• D.

None of the above

C. Analog end device
Explanation
A 4-20 mA pressure transducer is classified as an analog end device because it produces a continuous and varying output signal (4-20 mA) that corresponds to the measured pressure. Analog devices provide a smooth and continuous representation of the measured variable, in this case, pressure, allowing for precise and accurate measurements. Pneumatic end devices use compressed air as the input/output medium, while digital end devices use digital signals for communication. However, a 4-20 mA pressure transducer operates on an analog signal, making it an analog end device.

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• 14.

### ANSI 150 series flanges are typically referred to as "150-pound" flanges.  They can handle higher pressure without leaking but are only rated for 150 psig.

• A.

TRUE

• B.

FALSE

B. FALSE
Explanation
ANSI 150 series flanges are not typically referred to as "150-pound" flanges. While they can handle higher pressure without leaking, they are actually rated for 300 psig, not 150 psig. Therefore, the given statement is false.

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• 15.

### When two 12 volt batteries are wired in parallel, how many volts do they provide?

• A.

12 volts

• B.

6 volts

• C.

24 volts

• D.

This will short circuit and cause a fire

A. 12 volts
Explanation
When two 12 volt batteries are wired in parallel, they provide 12 volts. When batteries are wired in parallel, the positive terminals are connected to each other and the negative terminals are connected to each other. This configuration allows the batteries to share the load and effectively act as a single battery with the same voltage. Therefore, the voltage remains the same, which in this case is 12 volts.

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• 16.

### If an engine is running too hot, there are many things that could be the cause.  Which of these is NOT a probable cause of the problem?

• A.

Timing advance is too low

• B.

Fuel mixture is too lean

• C.

Water pump suction hose is too soft

• D.

Cooling fan belts too loose

B. Fuel mixture is too lean
Explanation
An engine running too hot can be caused by various factors such as low timing advance, a soft water pump suction hose, or loose cooling fan belts. However, a fuel mixture that is too lean is not a probable cause of the problem. A lean fuel mixture means that there is a higher proportion of air to fuel, which typically results in a cooler combustion temperature. Therefore, a lean fuel mixture would not cause the engine to run too hot.

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• 17.

### Natural gas that has a specific gravity (S.G.) of 0.65 is

• A.

Heavier than air

• B.

Lighter than air

• C.

Weight has nothing to do with this

• D.

Weighs the same as air

B. Lighter than air
Explanation
Natural gas that has a specific gravity (S.G.) of 0.65 is lighter than air. Specific gravity is a measure of the density of a substance compared to the density of another substance, usually water. Since the specific gravity of natural gas is less than 1, it means that it is less dense than air. Therefore, natural gas will tend to rise and disperse in the atmosphere rather than sink, making it lighter than air.

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• 18.

### For any given set of operating conditions, compressing 0.65 S.G. methane gas will create MORE heat from compression than air will.

• A.

True

• B.

False

B. False
Explanation
Compressing 0.65 S.G. methane gas will create LESS heat from compression than air will. This is because methane gas has a lower specific heat capacity compared to air, meaning it requires less energy to raise its temperature. Therefore, compressing methane gas will generate less heat compared to compressing air under the same operating conditions.

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• 19.

### A coalescent filter (discharge filter) may get contaminated and "plugged off" over time. Choose a sign or symptom that this has happened.

• A.

Decreased discharge temp

• B.

Compressor oil loss

• C.

Scavenger line pressure decreases

• D.

Increased back pressure

• E.

Both B and D

• F.

B, C, and D

E. Both B and D
Explanation
Both options B and D suggest signs or symptoms of a contaminated and "plugged off" coalescent filter. Option B, compressor oil loss, indicates that the filter is not effectively removing contaminants from the system, leading to oil loss. Option D, increased back pressure, suggests that the filter is becoming clogged and obstructing the flow of air, resulting in higher pressure in the system. Therefore, both options B and D indicate that the coalescent filter may be contaminated and "plugged off."

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• 20.

### How can you tell if the coalescent filter needs to be changed? In other words, what do you do to verify what you answered in the previous question?

• A.

Sample the oil

• B.

Check differential pressure from suction to discharge

• C.

Check differential pressure across discharge filter

• D.

Check scavenger line pressure

• E.

Check temperature differential from oil injection temp to discharge temp

C. Check differential pressure across discharge filter
Explanation
To verify if the coalescent filter needs to be changed, one should check the differential pressure across the discharge filter. If the pressure difference is high, it indicates that the filter is clogged and needs to be replaced. This is because a clogged filter restricts the flow of oil, causing an increase in pressure. By monitoring the differential pressure, one can determine the condition of the filter and take necessary action to maintain the efficiency of the system.

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• 21.

### What are the four strokes of a 4-stroke engine?

• A.

Intake, injection, compression, ignition

• B.

Intake, injection, ignition, exhaust

• C.

Compression, fueling, combustion, rotation

• D.

Intake, compression, combustion, exhaust

D. Intake, compression, combustion, exhaust
Explanation
The correct answer is "Intake, compression, combustion, exhaust." In a four-stroke engine, the intake stroke involves the intake valve opening and the piston moving downward to allow air and fuel to enter the cylinder. The compression stroke occurs when the intake and exhaust valves are closed, and the piston moves upward, compressing the air and fuel mixture. The combustion stroke happens when the spark plug ignites the compressed mixture, causing an explosion that forces the piston back down. Finally, the exhaust stroke takes place when the exhaust valve opens, and the piston moves back up, pushing the burned gases out of the cylinder.

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• 22.

### What could happen if the fuel pot is operated at 60 psig?

• A.

Difficulty starting

• B.

Damaged pneumatic valves

• C.

Busted Diaphragm on ounce regulator

• D.

All of the above

• E.

Both A and C

D. All of the above
Explanation
If the fuel pot is operated at 60 psig, it can result in difficulty starting, damaged pneumatic valves, and a busted diaphragm on the ounce regulator. Operating the pot at this pressure can cause issues with the fuel system, leading to these potential problems.

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• 23.

### What is the primary function of a scavenge line on a screw compressor package?

• A.

Heat trace the fuel system

• B.

Scrubber drain

• C.

Return the oil into the suction if it gets through the coalscent filter

• D.

Over pressure relief system

• E.

Automatic bypass

C. Return the oil into the suction if it gets through the coalscent filter
Explanation
The primary function of a scavenge line on a screw compressor package is to return the oil into the suction if it gets through the coalescent filter. This is important because the oil can potentially contaminate the suction side of the compressor, leading to reduced efficiency and potential damage to the compressor components. By returning the oil back into the suction, the scavenge line helps to maintain the proper oil circulation and prevent any adverse effects on the compressor operation.

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• 24.

### Your electric motor has no direction of rotation sticker.  How do you determine if it is rotating in the correct direction?

• A.

• B.

If the panel displays an RPM, it is rotating correctly

• C.

If suction pressure is lower than discharge, it is correct

• D.

The compressor is marked with the correct rotation and the motor must turn accordingly

D. The compressor is marked with the correct rotation and the motor must turn accordingly
Explanation
The correct answer is that the compressor is marked with the correct rotation and the motor must turn accordingly. This means that there should be a label or marking on the compressor indicating the direction in which it should rotate. The motor should then be installed in such a way that it rotates in the same direction as indicated by the compressor. This ensures that the motor is rotating in the correct direction.

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• 25.

### To change the direction of rotation on a 3 phase electric motor, what do you do?  (call an electrician might be the right answer, but not the one I'm looking for)

• A.

Switch two legs of power

• B.

Specify CW or CCW on the touchscreen

• C.

This is a trick question. Electric motors can only turn counter clockwise

• D.

None of the above

A. Switch two legs of power
Explanation
To change the direction of rotation on a 3 phase electric motor, you need to switch two legs of power. By swapping the connections of two of the three power supply wires, the motor's magnetic field will be reversed, causing it to rotate in the opposite direction. This is a common method used to change the rotation direction of a 3 phase electric motor.

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• 26.

### Forcing more oil into a screw compressor will usually increase gas flow.

• A.

True

• B.

False

A. True
Explanation
Forcing more oil into a screw compressor will usually increase gas flow because the oil acts as a lubricant and helps to seal the gaps between the screw rotors, reducing internal leakage and improving the compression process. This allows for more efficient compression and increased gas flow.

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• 27.

### As an engine's load is increased, what happens to the intake manifold pressure?

• A.

Pressure increases

• B.

Pressure decreases

• C.

Vacuum increases

• D.

No change. Manifold pressure is unrelated to load

• E.

It will fluctuate drastically

A. Pressure increases
Explanation
As an engine's load increases, more air is required for combustion. This leads to an increase in the intake manifold pressure, as the engine needs to draw in more air to meet the increased demand. Therefore, the correct answer is "Pressure increases."

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• 28.

### If corrosive gas is present, like CO2 or H2S, why are gas aftercoolers typically the most affected component?

• A.

It is where most of the heat is present

• B.

Cooling the gas after compression allows water to condense, which forms acid when mixed with corrosive gasses

• C.

The cooler tubes are the thinnest part of the system

• D.

Coolers are typically poor quality and therefore more susceptible to damage

B. Cooling the gas after compression allows water to condense, which forms acid when mixed with corrosive gasses
Explanation
Gas aftercoolers are typically the most affected component when corrosive gas is present because cooling the gas after compression allows water to condense. When this condensed water mixes with corrosive gases like CO2 or H2S, it forms acid. This acid can corrode the components of the aftercooler, causing damage and degradation over time. Therefore, the presence of corrosive gases combined with the condensation of water makes the gas aftercoolers more susceptible to damage.

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• 29.

### What is a plunger lift used for?

• A.

Mechanical natural gas compression

• B.

Segregating the more valuable "heavy hydrocarbons" from the less valuable light gasses like nitrogen

• C.

Removing fluids from a gas well

• D.

None of the above

C. Removing fluids from a gas well
Explanation
A plunger lift is a device used to remove fluids from a gas well. It is designed to enhance the production of natural gas by periodically lifting and removing accumulated liquids from the wellbore. This helps to maintain optimal gas flow and prevent the buildup of liquids that can hinder the production process. The plunger lift system is commonly used in gas wells to improve efficiency and maximize the extraction of natural gas.

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• 30.

### If discharge pressure goes up, the coalescent filter will:

• A.

Work better

• B.

Not work as well

• C.

Not be affected

• D.

Collapse

A. Work better
Explanation
When the discharge pressure goes up, the coalescent filter will work better because higher pressure helps in the coalescing process. The increased pressure forces the particles and contaminants to come together and form larger droplets, making it easier for the filter to capture and remove them. This leads to improved filtration efficiency and better performance of the coalescent filter.

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• 31.

### For any pressure, which unit of measure would have a higher number?

• A.

PSIG

• B.

PSIA

B. PSIA
Explanation
PSIA stands for "pounds per square inch absolute," while PSIG stands for "pounds per square inch gauge." The term "absolute" in PSIA refers to the measurement of pressure relative to a perfect vacuum, while "gauge" in PSIG refers to the measurement of pressure relative to atmospheric pressure. Since atmospheric pressure is always positive, PSIA will always have a higher number compared to PSIG, which can have both positive and negative values.

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• 32.

### What is the correct firing order for a typical in-line six cylinder engine?

• A.

143265

• B.

143652

• C.

163524

• D.

153624

D. 153624
Explanation
The correct firing order for a typical in-line six cylinder engine is 153624. This means that the cylinders fire in the order of 1, 5, 3, 6, 2, and 4. The firing order is important because it determines the sequence in which the spark plugs ignite the fuel mixture in each cylinder. This specific firing order is commonly used in in-line six cylinder engines to ensure smooth and efficient combustion.

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• 33.

### What is the correct firing order for a GM 5.7L V8 engine?

• A.

14837562

• B.

18436572

• C.

18567243

• D.

8675309

B. 18436572
Explanation
The correct firing order for a GM 5.7L V8 engine is 18436572. This firing order specifies the sequence in which the engine's cylinders ignite and produce power. Each number represents a cylinder, and the order indicates the order in which they fire. This specific firing order ensures smooth and efficient engine operation, as it is designed to minimize vibrations and maximize power output.

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• 34.

### Which is capable of achieving more compression ratios without damage?

• A.

An A-300 liquid ring

• B.

A 2 stage reciprocating compressor

• C.

A plunger lift

• D.

Hair dryer

A. An A-300 liquid ring
Explanation
The A-300 liquid ring is capable of achieving more compression ratios without damage compared to the other options listed. This is because the liquid ring compressor operates by using a liquid ring to compress the gas, which allows for higher compression ratios without causing damage to the system. In contrast, a 2 stage reciprocating compressor and a plunger lift may have limitations in terms of compression ratios and potential for damage. A hair dryer, on the other hand, is not designed for compression and therefore is not capable of achieving high compression ratios.

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• 35.

### Oxygen leaking into the system can cause:

• A.

Engine unable to start

• B.

Engine misses/hesitates

• C.

Unable to pull load and come to full speed

• D.

All of the above

D. All of the above
Explanation
Oxygen leaking into the system can cause various issues with the engine. When there is an oxygen leak, the engine may be unable to start because the proper air-fuel mixture is disrupted. Additionally, the engine may miss or hesitate during operation due to the incorrect ratio of oxygen to fuel. Furthermore, the engine may not be able to pull a load or reach full speed because the presence of excess oxygen affects its performance. Therefore, all the given options - engine unable to start, engine misses/hesitates, and unable to pull load and come to full speed - can be caused by oxygen leaking into the system.

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• 36.

### What is a common reason an engine starter fuse will blow?

• A.

Weak battery

• B.

• C.

Short circuit in the starting system

• D.

All of the above

• E.

Both B and C

D. All of the above
Explanation
The correct answer is "All of the above". This means that all of the options mentioned - weak battery, highly loaded compressor, and short circuit in the starting system - can be common reasons for an engine starter fuse to blow. A weak battery may not provide enough power to start the engine, causing the fuse to blow. A highly loaded compressor can put excessive strain on the starter, leading to a blown fuse. Additionally, a short circuit in the starting system can cause an overload and result in the fuse blowing.

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• 37.

### Ignition wires can cause distributor cap and rotor failures.

• A.

True

• B.

False

A. True
Explanation
Ignition wires carry the electrical current from the distributor to the spark plugs, providing the necessary spark for combustion in the engine. Over time, these wires can become worn or damaged, leading to a weak or inconsistent spark. This can cause stress on the distributor cap and rotor, as they are responsible for distributing the spark to the correct spark plug. If the ignition wires are faulty, it can result in misfires, engine performance issues, and ultimately, distributor cap and rotor failures. Therefore, the statement that ignition wires can cause distributor cap and rotor failures is true.

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• 38.

### When a compressor is applied to a well with a plunger lift, well cycle times should not be adjusted.

• A.

True

• B.

False

B. False
Explanation
When a compressor is applied to a well with a plunger lift, well cycle times should be adjusted. This is because the compressor helps to increase the production rate of the well by providing additional pressure to lift the plunger. Adjusting the cycle times ensures that the plunger is lifted and dropped at the optimal intervals to maximize production efficiency. Therefore, the statement "well cycle times should not be adjusted" is incorrect.

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• 39.

### In a vapor recovery application, why is it important to keep the tank pressure no less than 2 ounces?

• A.

Vacuum on the tanks interferes with oil transfer

• B.

To keep from inducing air

• C.

To maintain the correct flow rate

• D.

Both B and C

B. To keep from inducing air
Explanation
Keeping the tank pressure no less than 2 ounces is important in a vapor recovery application to prevent the induction of air. If the tank pressure drops below this level, it can create a vacuum which can lead to air being drawn into the system. This can cause contamination and affect the efficiency of the oil transfer process. Additionally, maintaining the correct flow rate is also important in a vapor recovery application to ensure optimal performance. Therefore, the correct answer is to keep from inducing air.

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• 40.

### How much pilot pressure does the typical pneumatic dump system require?

• A.

5 psi MAX

• B.

20-30 psig

• C.

At least 50 psig

• D.

12-14 ounces

B. 20-30 psig
Explanation
The typical pneumatic dump system requires a pilot pressure of 20-30 psig. This pressure is necessary to activate the system and release the compressed air. The range of 20-30 psig ensures that there is enough pressure to effectively operate the system without exceeding the maximum pressure limit.

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• 41.

### What is the "horse shoe" symbol on a multi-meter and what is that function used for?

• A.

Ohms, for measuring electrical current

• B.

Hertz, for measuring frequency

• C.

Amps, for checking diodes and measuring resistance

• D.

Ohms, for checking continuity and measuring resistance

D. Ohms, for checking continuity and measuring resistance
Explanation
The "horse shoe" symbol on a multi-meter represents the Ohms function, which is used for checking continuity and measuring resistance. This function allows the user to determine whether there is a complete electrical connection between two points and to measure the resistance of a component or circuit.

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• 42.

### What is a primary function of the oil in an oil-flooded rotary screw compressor?

• A.

Lubricate the bearings

• B.

Seal the rotors to each other and the housing

• C.

Dissipate the heat of compression

• D.

All of the above

D. All of the above
Explanation
The oil in an oil-flooded rotary screw compressor serves multiple functions. Firstly, it lubricates the bearings, ensuring smooth operation and reducing friction between moving parts. Secondly, it seals the rotors to each other and the housing, preventing any leakage and maintaining the efficiency of the compressor. Lastly, it dissipates the heat generated during compression, preventing overheating and potential damage to the compressor. Therefore, the correct answer is "All of the above."

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• 43.

### What can happen to a liquid ring if the seal oil gets contaminated with condensate?

• A.

Nothing that causes any serious problem

• B.

Bearing lubrication is compromised, leading to early failure

• C.

Excessive discharge pressure

• D.

None of the above

A. Nothing that causes any serious problem
Explanation
If the seal oil in a liquid ring gets contaminated with condensate, it will not cause any serious problems. This suggests that the contamination does not affect the functioning of the liquid ring or its components. It is possible that the contamination may have minimal or no impact on the overall performance or efficiency of the liquid ring system.

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• 44.

### A micron (technically it's a micrometre) is a unit of measure for size.  Our compressor inlet filters are rated to filter a particle that is about five microns or bigger.  The compressor oil filters  will catch something about 11 microns or larger.  Which object below is about that size?

• A.

Marble

• B.

Grain of sand

• C.

Red blood cell

• D.

Diameter of a human hair

• E.

BB

C. Red blood cell
Explanation
A red blood cell is about 6-8 microns in diameter, which is larger than the 5-micron rating of the compressor inlet filters and the 11-micron rating of the compressor oil filters. Therefore, a red blood cell is about the size that the filters are designed to catch.

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• 45.

### Which machine fits the following application best? PS=0 psig PD=295 psig

• A.

Rotary screw

• B.

2 stage recip

• C.

Gas jack

• D.

PD blower

A. Rotary screw
Explanation
A rotary screw machine is the best fit for this application because it is capable of handling a wide range of pressure differentials. In this case, the pressure differential is 295 psig, which falls within the capabilities of a rotary screw machine. Additionally, rotary screw machines are known for their efficiency and reliability, making them a suitable choice for various applications.

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• 46.

### Which machine fits the following application best? PS=14" hg vac PD=25 psig

• A.

Rotary screw

• B.

Liquid ring

• C.

Gas jack

• D.

Leaf blower

A. Rotary screw
Explanation
Based on the given application specifications, a rotary screw machine would be the best fit. This is because a rotary screw compressor is capable of handling both vacuum and pressure applications, making it suitable for the specified PS (14" hg vac) and PD (25 psig). Additionally, rotary screw compressors are known for their efficiency and reliability, making them a popular choice for various industrial applications.

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• 47.

### Why is a check valve on the inlet of a screw compressor critical?

• A.

At shutdown, high pressure can flow back to the package inlet, which is not rated for much pressure

• B.

At shutdown, oil can flow back to the scrubber and be lost through the autodump

• C.

If pressure leaks back to suction on an autostart, it can trigger an unintentional start attempt

• D.

All of the above

• E.

Both B and C

D. All of the above
Explanation
A check valve on the inlet of a screw compressor is critical because it prevents various issues during shutdown and autostart. Without a check valve, high pressure can flow back to the package inlet, which can cause damage as the inlet is not designed to handle such pressure. Additionally, without a check valve, oil can flow back to the scrubber and be lost through the autodump, leading to oil loss. Furthermore, if pressure leaks back to suction during an autostart, it can trigger an unintentional start attempt. Therefore, having a check valve on the inlet of a screw compressor is crucial to avoid these potential problems.

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• 48.

### If the Vi ratio of a screw compressor is too low for an application, what will occur?

• A.

Overcompression

• B.

Excessive horsepower consumption

• C.

Torsional vibration

• D.

None of the above

B. Excessive horsepower consumption
Explanation
If the Vi ratio of a screw compressor is too low for an application, it means that the volume index (Vi) is not optimal for the specific requirements. This can lead to excessive horsepower consumption, as the compressor will need to work harder to compress the air or gas. A low Vi ratio indicates that the compressor is not efficiently compressing the fluid, resulting in higher energy consumption. Therefore, excessive horsepower consumption is the likely outcome when the Vi ratio is too low.

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• 49.

### A lean burn engine should have about how much excess oxygen in the exhaust?

• A.

None, it should run perfectly stochiometric

• B.

6.5 %

• C.

450 ppm

• D.

20.9 %

• E.

0.5%

B. 6.5 %
Explanation
A lean burn engine operates with an excess of oxygen in the exhaust to ensure efficient combustion. Having about 6.5% excess oxygen allows for complete combustion of fuel, resulting in lower emissions and improved fuel efficiency. This level of excess oxygen is considered optimal for lean burn engines.

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• 50.

### In a vapor recovery application, why is it important to keep the tank pressure below 8 ounces (typically)?

• A.

Over pressuring can cause an explosion if the liquids in the tank are primarily condensate

• B.

Most VRU suction lines are light ploymer and are not rated for much pressure

• C.

The EPA regulates the allowable pressure for hazardous material storage.

• D.

The tanks will vent gas if allowed to exceed the relief hatch pressure.

D. The tanks will vent gas if allowed to exceed the relief hatch pressure.
Explanation
If the tank pressure exceeds the relief hatch pressure, the tanks will vent gas. This is important in a vapor recovery application because it helps prevent the over pressurization of the tank, which can lead to safety hazards such as explosions. By keeping the tank pressure below 8 ounces, the risk of over pressurization and potential gas venting is minimized, ensuring the safe operation of the vapor recovery system.

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• Current Version
• Mar 17, 2023
Quiz Edited by
ProProfs Editorial Team
• Feb 23, 2011
Quiz Created by
Arios

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