106 Flashcards
A liquid has a ______ shape and a _______ volume
Changeable; fixed
Kilograms per cubic meter (kg/m^3 ) is the unit of metric measurement for
Density
The temperature of a liquid decreases as it
Evaporates
During laminar flow, the fluid in a pipe
Moves in parallel layers
The solubilty of a gas in a liquid is usually _______ at the liquid’s boiling point.
Lowest
Activated carbon is widely used for
Absorbing impurities
At room temperature, carbon is chemically
Inert
Excessive noise in electric hand tools often indicates
Carbon brush problems
Nonporous carbon seals are used in applications where
Even a tiny leak would be harmful
In shaft seals that have two individual packing rings, the joints should be positioned ______° apart
180
Plastics that can be reheated and reshaped many times are called
Thermoplastics
What method of molding produces intricate parts at high speed and low cost?
Injection molding
In filament winding, glass fiber is wound around a form called a(n)
Mandrel
When drilling most plastics, you should reduce the feed rate just before the drill point ____ the work
Penetrates the far side of
When preparing an area of corroded surface to be patched, which side of the material should be cleaned?
Both sides
If stretched to twice Its normal length and released, an elastomer will
Retum to Its orginal shape
Class T rubber compounds resist damage from
Extreme temperature
Most rubber compounds are
Flammable
In vulcanization, the more sulfur that is added, the ______ the rubber becomes
Harder
What characteristic is most important in the rubber coating of wire in extension cords?
Flexibility
Cutting a log lengthwise through or near its centerine produces a ____ cut
Radial
The actual length of a board is stated in ______ feet. Lumber is sold in _____ feet
Running, board
The best veneer in softwood plywood is graded
N
Wood with many knots should not be used for structural support because it is
Weak
How deep should the pilot hole for a screw be drilled in softwood?
Half the screw length
Air-eritrained concrete is commonly used for
Structres exposed to severe cold
Cinder block is commonly used for construction
Above ground
Type N mortar is a ______ -strength mortar used for ______ -bearing clay tile construction.
Medium; load
Which type of plaster sets very quickly and should be used only for small patching jobs?
Plaster of Paris
The correct size of the pane of glass for this window is
W/ picture illustration
23 ^7/8 in x 26 ^7/8 in
Convection heat is the
Transter of heat by fluids
What type of insulation can withstand both high and low temperatures, is chemically inert and may be used in ovens and freezers?
Mineral wool
You can use lead sheet or plastic film for
Reducing vibration of pipes or ducts
An asphalt coating serves as a(n) ______ on the outside of underground walls
Moisture barrier
Which of the following materials has the highest dielectric strength?
Mica
The part of a paint that binds solid particles into a uniform film is called the
Vehicle
The single most important factor for success in painting a structure is
Surtace preparation
In sandblasting, the intensity that produces the best anchor pattern for paint is called _____ blasting
White
The color specified by ANSI to Indicate first-aid stations and safety equipment in a plant is
Green
The process of melting zing with an oxyacetylene flame and spraying it onto a metal surface for protection is called
Metalizing
Which pH value below indicates an acid solution?
5
The solvent, ______ should not be used for cleaning because it is highly fammable and irritates the skin.
Gasoline
You should use _____ acid to dissolve hard water deposits in heating and cooling systems.
Sulfamic
Chemicals used to prevent the formation of scale in piping systems and boilers are called:
Sequestrants
Fires involving electrical equipment and wiring are designated
Class C
The completion of all chemical and physical reactions that affect adhesive bonding is called
Curing
An adhesive made of water-soluble gums and starches is called
Mucilage
The strongest adhesive joint is the _____ joint
Bevel lap
Good electrical insulation is provided by ______ tape
Rubber
Tapes coated with fluorocarbon adhesives are used where service conditions include
High temperatures
