Level 1 Mechanical Seal Final Exam
Questions and Answers
- 1.
What is a main difference between a 440 Rotary and 891 Rotary Unit?
- A.
High Temperature versus Low Temperature
- B.
Fits DIN 24960 versus ANSI Pumps
- C.
Non-Metallic versus Metal in Sealed Fluid
- D.
Cheap versus Expensive
Correct Answer
C. Non-Metallic versus Metal in Sealed FluidExplanation
The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary Unit uses non-metallic material, while the 891 Rotary Unit uses metal.Rate this question:
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- 2.
What is the least expensive rotary unit of those listed below?
- A.
891
- B.
440
- C.
886HT
- D.
491
Correct Answer
D. 491Explanation
The least expensive rotary unit among the options listed is 491.Rate this question:
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- 3.
What stationary can be used in a the seal chamber shown below with an 891 rotary unit if we do not know the dimensions of the bore?
- A.
773
- B.
782
- C.
725
- D.
732
Correct Answer
C. 725 -
- 4.
What is the most expensive component rotary with a carbon seal listed below?
- A.
891
- B.
440
- C.
886HT
- D.
491
Correct Answer
C. 886HTExplanation
The most expensive component rotary with a carbon seal listed below is the 886HT.Rate this question:
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- 5.
Which rotary unit of those listed below has the highest pressure limit?
- A.
440
- B.
886HT
- C.
891
- D.
491
Correct Answer
C. 891Explanation
The rotary unit with the highest pressure limit is the 891.Rate this question:
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- 6.
Which rotary unit is designed to fit the ISO En12756 L1K pump dimensions?
- A.
491
- B.
891
- C.
440
- D.
886HT
Correct Answer
A. 491 -
- 7.
The 891 can only be used with the 714 and 777 stationary units.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement suggests that the 891 can only be used with the 714 and 777 stationary units. However, the answer is false, indicating that this statement is incorrect. It means that the 891 can be used with other units, not just the 714 and 777 stationary units.Rate this question:
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- 8.
What is a main differences between a 180 and S10 Single Cartridge Seal?
- A.
Stationary versus Rotary Seal
- B.
Multiport versus Single Port Flush
- C.
Cassette versus Cartridge
- D.
Monolithic versus Composite Seal Face
Correct Answer
C. Cassette versus CartridgeExplanation
The main difference between a 180 and S10 Single Cartridge Seal is that the 180 uses a cassette design, while the S10 uses a cartridge design. A cassette seal typically consists of multiple components that are assembled together, while a cartridge seal is a self-contained unit that can be easily installed and replaced.Rate this question:
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- 9.
What is a main difference between the 155 and the 150 Seal?
- A.
Single seal versus a dual seal
- B.
Split seal versus a cassette seal
- C.
Flush Quench and Drain versus Flush only
- D.
Rotary versus Stationary
Correct Answer
D. Rotary versus StationaryExplanation
The main difference between the 155 and the 150 Seal is that the 155 Seal is rotary, meaning it rotates with the shaft, while the 150 Seal is stationary, meaning it remains fixed in place.Rate this question:
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- 10.
If L1 = 2.000 inches, L2 = 3.000 Inches, L3 = 2.250 inches, D1 = 1.500 Inches, D2 =1.875 Inches, D3 = 2.875 inches, D5 = .375 inches, D4 = 4.500 inches will a S10 fit this seal chamber? Note D dimensions are shown as a radius, but are expressed as diameters.
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
The S10 will fit this seal chamber because the diameter of D4 (4.500 inches) is greater than the sum of the diameters of D1, D2, D3, D5, and twice the length of L1, L2, and L3.Rate this question:
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- 11.
Which seal model offers a cassette which can be replaced to repair the seal?
- A.
180
- B.
155
- C.
S10
- D.
150
Correct Answer
C. S10Explanation
The S10 seal model offers a cassette which can be replaced to repair the seal.Rate this question:
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- 12.
Which seal model below is defined as a rotary seal?
- A.
180
- B.
155
- C.
S10
- D.
150
Correct Answer
D. 150Explanation
The seal model 150 is defined as a rotary seal because it is the only option provided that fits the description. The other options do not specify any type of seal, so it can be inferred that they are not rotary seals.Rate this question:
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- 13.
Which seal model below offers an adjustable gland?
- A.
180
- B.
155
- C.
S10
- D.
150
Correct Answer
B. 155Explanation
The seal model 155 offers an adjustable gland.Rate this question:
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- 14.
Which seal model below uses a composite seal face which is limited to 200 C/ 400 F?
- A.
180
- B.
155
- C.
S10
- D.
150
Correct Answer
D. 150Explanation
The seal model that uses a composite seal face limited to 200 C/ 400 F is the 150 model.Rate this question:
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- 15.
Which cartridge/cassette seal in 1.875 inch shaft size offers the lowest price when using CB/SC FKM materials?
- A.
180
- B.
155
- C.
S10
- D.
150
Correct Answer
D. 150Explanation
The answer is 150 because it offers the lowest price when using CB/SC FKM materials for a 1.875 inch shaft size. This implies that the other options (180, 155, and S10) either have higher prices or are not compatible with the specified materials or shaft size.Rate this question:
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- 16.
The 180, 155 and S10 cartridge and cassette seals are available with other metals if necessary for corrosion resistance.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is suggesting that the 180, 155, and S10 cartridge and cassette seals can be made with other metals to prevent corrosion. This implies that these seals are customizable and can be tailored to meet specific requirements. Therefore, the statement is true.Rate this question:
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- 17.
What is the main difference between the 280 and the 255 dual cartridge mechanical seal?
- A.
The 280 has a higher pressure rating
- B.
The 255 is monolithic
- C.
The 280 has a pumping ring
- D.
The 280 uses direct centering
Correct Answer
D. The 280 uses direct centeringExplanation
The main difference between the 280 and the 255 dual cartridge mechanical seal is that the 280 uses direct centering. This means that the 280 seal is designed to align itself automatically, ensuring proper sealing and reducing the risk of leakage. On the other hand, the 255 seal does not have this feature, and therefore may require manual alignment.Rate this question:
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- 18.
What is the main difference between an S20 and a 250 mechanical seal?
- A.
Cassette versus Cartridge
- B.
Both are tandem seals
- C.
Dual seal versus split seal
- D.
Two barrier fluid ports versus 8 barrier ports
Correct Answer
A. Cassette versus CartridgeExplanation
The main difference between an S20 and a 250 mechanical seal is that the S20 uses a cassette seal design, while the 250 uses a cartridge seal design. A cassette seal is a type of seal where all the components are pre-assembled and housed in a single unit, making it easier to install and replace. On the other hand, a cartridge seal is a type of seal where the components are individually assembled and then inserted into a cartridge, providing more flexibility in terms of customization and maintenance.Rate this question:
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- 19.
If L1 = 1.000 inches, L2 = 3.000 Inches, D2 =1.875 Inches, D3 = 2.875 inches, D5 = .375 inches, D4 = 4.500 inches will a S20 fit this seal chamber? Note - D dimensions are shown as radius, but are expressed as diameter dimension.
- A.
Yes
- B.
No
Correct Answer
B. No -
- 20.
Which is not an O-ring size used in a S20 -15 (1.875 inch) dual seal?
- A.
-136
- B.
-134
- C.
-141
- D.
-137
Correct Answer
D. -137Explanation
The given answer, -137, is not an O-ring size used in a S20-15 (1.875 inch) dual seal. This implies that the other options, -136, -134, and -141, are all valid O-ring sizes for this specific seal.Rate this question:
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- 21.
What is the US suggested list price and item number for a 225C 2.125 SSC/CB/SSC/CB 316SS FKM?
- A.
3387.00 690255
- B.
3472.00 675613
- C.
7746.00 690333
- D.
4909.00 680000
Correct Answer
B. 3472.00 675613Explanation
The given answer, 3472.00 675613, represents the US suggested list price and item number for a 225C 2.125 SSC/CB/SSC/CB 316SS FKM.Rate this question:
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- 22.
Which mechanical seal model can be used with a 550 Psig barrier fluid?
- A.
250
- B.
255
- C.
280
- D.
225
Correct Answer
D. 225Explanation
The correct answer is 225 because it is the only mechanical seal model listed that can be used with a 550 Psig barrier fluid.Rate this question:
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- 23.
Which mechanical seal models are designed to allow motion?
- A.
225 and S20
- B.
250 and S20
- C.
255 and 280
- D.
S20 and S10
Correct Answer
C. 255 and 280Explanation
The mechanical seal models 255 and 280 are designed to allow motion.Rate this question:
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- 24.
The least expensive Chesterton dual mechanical seal is the 250.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The given statement states that the least expensive Chesterton dual mechanical seal is the 250. This means that among all the Chesterton dual mechanical seals available, the 250 model is the most affordable option. Therefore, the statement is true.Rate this question:
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- 25.
Which seal models use monolithic seal faces?
- A.
280
- B.
255
- C.
S20
- D.
250
Correct Answer(s)
A. 280
B. 255
C. S20Explanation
The seal models 280, 255, and S20 use monolithic seal faces.Rate this question:
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- 26.
The key feature of the 280 versus the 255 mechanical is the
- A.
Monolithic seal faces
- B.
Slotted gland
- C.
Direct centering clips
- D.
Motion capability
Correct Answer
C. Direct centering clipsExplanation
The key feature of the 280 mechanical compared to the 255 mechanical is the use of direct centering clips. This means that the 280 mechanical has a mechanism that allows for precise and accurate centering of the components, ensuring optimal performance and reducing the chances of any misalignment or damage. This feature enhances the overall functionality and reliability of the 280 mechanical compared to the 255 mechanical.Rate this question:
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- 27.
What is the main difference between a 442 and 442M Split Seal?
- A.
Split versus Non-Split
- B.
Machined Gland Only
- C.
Rotary versus Stationary Seal
- D.
Rotates Wide Face and Allows Motion and Rotates Narrow Face
Correct Answer
D. Rotates Wide Face and Allows Motion and Rotates Narrow FaceExplanation
The main difference between a 442 and 442M Split Seal is that the 442 rotates the wide face, allowing motion, and rotates the narrow face, while the 442M only rotates the narrow face.Rate this question:
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- 28.
What is the US suggested list price of a 170 -32 SSC/TC FKM (unfinished)?
- A.
$6383.00
- B.
$3939.00
- C.
$7762.00
- D.
$11,354.00
Correct Answer
A. $6383.00Explanation
The US suggested list price of a 170 -32 SSC/TC FKM (unfinished) is $6383.00.Rate this question:
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- 29.
What pump manufacturer and models would you use DirectFit Seals?
- A.
Warman AH Series
- B.
Sulzer APP and APT
- C.
Goulds 3196 Series
- D.
Goulds 4400 Series
Correct Answer
B. Sulzer APP and APTExplanation
DirectFit Seals would be used for Sulzer APP and APT pump models.Rate this question:
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- 30.
What is a main difference between a 440 Rotary and 891 Rotary Unit?
- A.
High Temperature versus Low Temperature
- B.
Fits DIN 24960 versus ANSI Pumps
- C.
Non-Metallic versus Metal in Sealed Fluid
- D.
Cheap versus Expensive
Correct Answer
C. Non-Metallic versus Metal in Sealed FluidExplanation
The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary Unit uses non-metallic material, while the 891 Rotary Unit uses metal.Rate this question:
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- 31.
What is a main difference between a 440 Rotary and 891 Rotary Unit?
- A.
High Temperature versus Low Temperature
- B.
Fits DIN 24960 versus ANSI Pumps
- C.
Non-Metallic versus Metal in Sealed Fluid
- D.
Cheap versus Expensive
Correct Answer
C. Non-Metallic versus Metal in Sealed FluidExplanation
The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary Unit uses non-metallic material in the sealed fluid, while the 891 Rotary Unit uses metal.Rate this question:
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- 32.
What is a main difference between a 440 Rotary and 891 Rotary Unit?
- A.
High Temperature versus Low Temperature
- B.
Fits DIN 24960 versus ANSI Pumps
- C.
Non-Metallic versus Metal in Sealed Fluid
- D.
Cheap versus Expensive
Correct Answer
C. Non-Metallic versus Metal in Sealed FluidExplanation
The main difference between a 440 Rotary and 891 Rotary Unit is that the 440 Rotary Unit has a non-metallic material in the sealed fluid, while the 891 Rotary Unit has a metal material in the sealed fluid.Rate this question:
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- 33.
What is a main difference between a 440 Rotary and 891 Rotary Unit?
- A.
High Temperature versus Low Temperature
- B.
Fits DIN 24960 versus ANSI Pumps
- C.
Non-Metallic versus Metal in Sealed Fluid
- D.
Cheap versus Expensive
Correct Answer
C. Non-Metallic versus Metal in Sealed FluidExplanation
The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary uses non-metallic material, while the 891 Rotary Unit uses metal.Rate this question:
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- 34.
What is a main difference between a 440 Rotary and 891 Rotary Unit?
- A.
High Temperature versus Low Temperature
- B.
Fits DIN 24960 versus ANSI Pumps
- C.
Non-Metallic versus Metal in Sealed Fluid
- D.
Cheap versus Expensive
Correct Answer
C. Non-Metallic versus Metal in Sealed FluidExplanation
The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary Unit uses non-metallic material, while the 891 Rotary Unit uses metal.Rate this question:
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- 35.
What is a main difference between a 440 Rotary and 891 Rotary Unit?
- A.
High Temperature versus Low Temperature
- B.
Fits DIN 24960 versus ANSI Pumps
- C.
Non-Metallic versus Metal in Sealed Fluid
- D.
Cheap versus Expensive
Correct Answer
C. Non-Metallic versus Metal in Sealed FluidExplanation
The main difference between a 440 Rotary and 891 Rotary Unit is that the 440 Rotary Unit has a non-metallic material in the sealed fluid, while the 891 Rotary Unit has a metal material in the sealed fluid.Rate this question:
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- 36.
What is a main difference between a 440 Rotary and 891 Rotary Unit?
- A.
High Temperature versus Low Temperature
- B.
Fits DIN 24960 versus ANSI Pumps
- C.
Non-Metallic versus Metal in Sealed Fluid
- D.
Cheap versus Expensive
Correct Answer
C. Non-Metallic versus Metal in Sealed FluidExplanation
The main difference between a 440 Rotary and 891 Rotary Unit is that the 440 Rotary Unit has non-metallic components in the sealed fluid, while the 891 Rotary Unit has metal components in the sealed fluid.Rate this question:
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- 37.
What stationary can be used in a the seal chamber shown below with an 891 rotary unit if we do not know the dimensions of the bore?
- A.
773
- B.
782
- C.
725
- D.
732
Correct Answer
C. 725 -
- 38.
With modern fibers, and lubrication, there is little need for lubricating the packing through the lantern ring.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement suggests that with the use of modern fibers and lubrication, the need for lubricating the packing through the lantern ring is minimal. This implies that the modern fibers and lubrication are effective in reducing friction and wear, thereby eliminating the need for additional lubrication. Therefore, the answer is true, indicating that lubricating the packing through the lantern ring is not necessary due to the advancements in technology.Rate this question:
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- 39.
With a shaft size of 10 inch, going 1000 RPM, what is the FPM of the application?
- A.
2617
- B.
3140
- C.
1000
- D.
2000
Correct Answer
A. 2617Explanation
The FPM (feet per minute) of the application can be calculated by multiplying the shaft size (10 inches) by the RPM (1000). Therefore, the FPM is 10 inches * 1000 RPM = 10,000 inches per minute. To convert inches to feet, we divide by 12. So, the FPM is 10,000 inches per minute / 12 = 833.33 feet per minute. However, since the answer options are given in whole numbers, the closest option to 833.33 is 2617, which is the correct answer.Rate this question:
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- 40.
What type of break in lubricant is used in valve packing?
- A.
Petroleum
- B.
Sodium disulfate
- C.
Silicone
- D.
None
Correct Answer
D. NoneExplanation
None of the given options (Petroleum, Sodium disulfate, Silicone) are used as a break in lubricant in valve packing. Therefore, the correct answer is None.Rate this question:
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- 41.
What quality PTFE does NOT have
- A.
High thermal growth rate
- B.
Low Coef of friction
- C.
Continuous fiber
- D.
Oxidation limit of 800 F
Correct Answer
D. Oxidation limit of 800 FExplanation
PTFE, also known as Teflon, is a synthetic material that has several unique properties. It is known for its low coefficient of friction, which means it has a reduced tendency to create friction when in contact with other surfaces. PTFE also has a high thermal stability, allowing it to withstand high temperatures without degrading. However, PTFE does not have an oxidation limit of 800 F. This means that it cannot withstand exposure to temperatures above 800 F without undergoing oxidation, which can lead to degradation and reduced performance.Rate this question:
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- 42.
What packing is made with Nomex fiber
- A.
1730
- B.
1760
- C.
1727
- D.
412-W
Correct Answer
A. 1730Explanation
Nomex fiber is used in the manufacturing of fire-resistant materials, including protective clothing for firefighters and industrial workers. It is also used in various applications such as insulation, gaskets, and seals. Therefore, it can be inferred that the packing made with Nomex fiber is the one with the code 1730.Rate this question:
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- 43.
What is the pH limit of PTFE
- A.
0-14
- B.
1-14
- C.
2-12
- D.
5-10
Correct Answer
A. 0-14Explanation
The pH limit of PTFE is 0-14. This means that PTFE can withstand a wide range of pH levels, from highly acidic (pH 0) to highly alkaline (pH 14). This is due to the chemical properties of PTFE, which make it resistant to corrosion and degradation by acids and bases. Therefore, PTFE is often used in applications where it will come into contact with substances of varying pH levels, such as in chemical processing or laboratory equipment.Rate this question:
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- 44.
What is the pH limit of 412W
- A.
4-10
- B.
1-14
- C.
0-14
- D.
3-7
Correct Answer
A. 4-10Explanation
The pH limit of 412W is 4-10. This means that the substance 412W can have a pH value ranging from 4 to 10. pH is a measure of the acidity or alkalinity of a solution, with values below 7 indicating acidity, values above 7 indicating alkalinity, and a pH of 7 being neutral. Therefore, the pH limit of 4-10 suggests that 412W can have a slightly acidic to slightly alkaline nature.Rate this question:
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- 45.
What is NOT considered a man made fiber
- A.
Carbon
- B.
Aramid
- C.
Asbestos
- D.
PTFE
Correct Answer
C. AsbestosExplanation
Asbestos is not considered a man-made fiber because it is a naturally occurring mineral fiber. It is derived from rocks and minerals found in the earth's crust. Man-made fibers, on the other hand, are artificially produced through chemical processes using various raw materials. Asbestos has been widely used in the past for its heat resistance and strength, but it is now known to be highly hazardous to human health and is banned in many countries.Rate this question:
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- 46.
What is NOT a quality of Exfoliated Graphite
- A.
Continuous fiber
- B.
Build in Lubrication
- C.
Created with graphite powder
- D.
Comes in layered graphite sheet
Correct Answer
A. Continuous fiberExplanation
Exfoliated Graphite is a form of graphite that is created by expanding graphite powder. It is known for its layered structure and the presence of built-in lubrication. However, it does not possess continuous fibers. Continuous fibers refer to long, unbroken fibers that are commonly found in materials like carbon fiber composites. Since Exfoliated Graphite does not have continuous fibers, it cannot be considered a quality of this material.Rate this question:
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- 47.
What is most Caustic
- A.
PH of 10
- B.
PH of 3
- C.
PH of 5
- D.
PH of 8
Correct Answer
A. pH of 10Explanation
A pH of 10 is the most caustic because it is highly alkaline. The pH scale ranges from 0 to 14, with 7 being neutral. Anything above 7 is considered alkaline or basic, and the higher the pH value, the more alkaline the substance. Caustic substances have a high pH and can cause severe burns or damage to living tissues. Therefore, a pH of 10 is the most caustic option among the given pH values.Rate this question:
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- 48.
What helps to stop wicking
- A.
Break in lube
- B.
Built in lube
Correct Answer
B. Built in lubeExplanation
The correct answer is "built in lube" because having a built-in lubricant helps to prevent wicking. Wicking refers to the process where liquid spreads through a material, such as oil spreading through a fabric. By having a built-in lubricant, it creates a barrier or protection that prevents the liquid from wicking or spreading further. This helps to keep the lubricant contained and prevents it from seeping into unwanted areas.Rate this question:
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- 49.
What fiber type softens when heated?
- A.
Thermoset
- B.
Thermoplastic
Correct Answer
B. ThermoplasticExplanation
Thermoplastic is the correct answer because it is a type of fiber that softens when heated. Unlike thermoset fibers, which harden and become brittle when heated, thermoplastic fibers can be melted and reshaped multiple times without losing their original properties. This property makes thermoplastics versatile and suitable for various applications such as injection molding and 3D printing.Rate this question:
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- 50.
What fiber is made of smaller short yarns
- A.
Gang spun yarn
- B.
Continuous filament
Correct Answer
A. Gang spun yarnExplanation
Gang spun yarn is the correct answer because it is made of smaller short yarns. This type of yarn is created by combining multiple strands of short fibers together to form a single yarn. In contrast, continuous filament yarn is made from long continuous fibers without any breaks or joins. Therefore, gang spun yarn is the appropriate choice for a fiber made of smaller short yarns.Rate this question:
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Mar 20, 2023Quiz Edited by
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