ITEC 271 Final Exam Flashcards
Contaminants can be
Ingested, built-in, created
We need filters because
They protect our system
Performance is measured by
Efficiency and capacity
True or False: Efficiency - amount of impurities that the filter can hold before it reaches maximum restriction
False
True or False: Capacity is measured as a percentage
False
2 threaded components are assembled together using a bolt and nut
Bolt
They cannot be involved in bolted joint making due to the presence of at least one thread
Screw
True or False: Capacity is the filter’s ability to remove contaminants
False
TPI stands for
Threads per inch
Poor self healing properties, easily washed away
Dry lubricant
True or False: Filters can be interchangeable, as long as they have the same dimensions
False
Advantages of fasteners
Inexpensive, versatile, lightweight, recyclable
True or False: Adhesive is a substance that is capable of holding materials together
True
Most common industrial adhesives are
Resins, hot melt, contact spray, acrylic, anaerobic adhesive, conductive, epoxy adhesives, pressure adhesives
True or False: Media, is the part of the filter that does all the filtration
True
True or False: Welding is a fabrication process that joins material, woods and metals, or thermoplastics, by using heat to melt
False
Some methods to remove water from fuel during filtration are
Absorption, coalescing, stripping
True or False: Contact spray allows to bond different items both temporarily and permanently
True
True or False: Grease is widely used for its great capacity to dissipate heat
False
True or False: Oils are great lubricants to be used in applications with high centrifugal force
False
True or False: Arc shielding prevents molten metal from getting in contact with oxygen
True
Some of the functions of oil are
Sealing, cleaning, lubrication
True or False: Oil is a thin liquid with additives that enhances corrosion, oxidation, and keeps deposits from forming
False
True or False: Increasing temperatures will cause viscosity to increase
False
True or False: Primary filter, is always going to be on the pressure side
False
A type of polymer or synthetic origin, long curing time, ideal for woodworking or other applications that require unhurried and careful assembly
Resins
Can be used and re-used by applying heat or cold, whenever the user wants, excellent bonding quality, easy to rectify if mistakes have been made
Hot melt
Bond different items temporarily and permanently, can be used on uneven and porous surfaces, is waterproof and transparent, environment friendly, does not stain
Contact spray
Require time to set and dry, two different components, mixed together, used in construction, used for bonding, sealing and protection
Acrylic
Can set without using oxygen or air, good for use when needing to form tight seals without the use of heat, oxygen or light. Can bond different types of materials.
Anaerobic adhesive
Used in construction and industries that need to avoid electrostatic discharges. Can improve heat dissipation because they form thermoconductive layers between products and components
Conductive
Used in automotive and aircraft industries cure fast and bonds concrete surfaces as well. Used in the manufacturing of plywood
Epoxy
Requires pressure to bond (Tapes)
Pressure adhesive
A fabrication or sculptural process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool causing fusion
Welding
What are the 4 different types of welding?
- Shielded Metal Arc Welding (SMAW)
- Gas Metal Arc Welding (GMAW/MIG)
- Flux Cored Arc Welding (FCAW)
- Gas Tungsten Arc Gas Welding (GTAW/TIG)
Is used to join metal to metal by using electricity to create enough heat to melt metal, and the melted metals when cool result in a binding of the metals. AC or DC power source needed. Arc produces temp. of about 6500F steel melts at 2500F
Arc Welding
Metals react with elements in the air(oxygen and nitrogen), molten metal comes in contact with the air, oxides and nitrides form, destroying strength and toughness of the weld joint. Arc-weld provides covering.
Arc Shielding
A substance, such as oil or grease, used for minimizing friction especially in an engine or component
Lubricants
Types of lubricants
Oils, greases, penetrating lubricants and dry lubricants
Is a thin liquid made with additives for extra properties. These additives reduce corrosion, reduce oxidization, and keeps deposits from forming
Oil
How is oil classified?
Rated based on it’s viscosity (thickness or weight)
What does the “W” in a grade (rating) of oil stand for?
Stands for weight, or how viscous (thick) your oil is at cold temperature. The lower the number is, the less thick it is
The measurement of the oil’s resistance to shear or flow
Viscosity
What is pour point?
The lowest temperature at which an oil will flow
What is flash point?
The highest temperature a lubricant can be heated before its vaporized
Made out of particles, found in a spray form and mixed with water, alcohol or another solvent that will evaporate after application and leave behind only a thin film
Dry lubricant
Advantages of dry lubricants
Protection against corrosion, good lubrication in high humidity, high temp stability, excellent adhesion, excellent conductor of electricity
Disadvantages of dry lubricants
Poor self healing properties, easily washed away
Advantages of grease
Adhesion, less frequent application, seals, water resistant, reduces noise and vibrations, better mechanical lubrication
Disadvantages of grease
Poor dissipation of heat, no filtration so retains contaminants
Disadvantages of fasteners
Loses strength under high temperatures, corrodes easily (rusts)
