Engineering

Q: The ratio of the amount of moisture in the air to the maximum amount of moisture that air can hold is known as a. dew point. b. absolute humidity. c. relative humidity. d. none of the above

Q: The ratio of the mass of water vapor to the mass of dry air is known as a. dew point. b. absolute humidity. c. relative humidity. d. none of the above

Q: There are two common ways of expressing the amount of water vapor in air: a. dew point and relative humidity. b. dew point and absolute humidity. c. absolute humidity and relative humidity. d. none of the above

Q: Most of the ultraviolet radiation arriving on earth from the sun is absorbed by a. air. b. nitrogen. c. water vapor. d. ozone.

Q: The earth's atmosphere, which we refer to as air, is a mixture of approximately a. 78% oxygen, 21% nitrogen, and less than 1% carbon dioxide. b. 78% nitrogen, 21% oxygen, and less than 1% argon. c. 78% oxygen, 21% carbon dioxide, and less than 1% helium. d. 78% oxygen, 21% water vapor, and less than 1% ozone.

Q: Air is often used a. as a cooling and heating medium. b. in controlling thermal comfort in buildings. c. as a controlling medium to turn equipment on and off. d. to drive power tools. e. all of the above

Q: The layer of air closest to the earth's surface is called the troposphere and plays an important role in shaping our weather. a. True b. False

Q: The air surrounding the earth can be divided into four distinct regions: ________________ ________________ ________________ ________________

Q: Air is a mixture of mostly oxygen, and small amounts of other gases. a. True b. False

Q: Air and water are among the most abundant fluids on earth. a. True b. False

Q: The term fluids refers to liquids, not gases. a. True b. False

Q: Composites may be classified into a. polymer-matrix composites b. metal-matrix composites c. ceramic-matrix composites d. all of above

Q: Examples of fibers used in the construction of composite materials include a. glass b. graphite c. silicon carbide fibers d. all of above

Q: Composite materials consist of two main ingredients: matrix material and fibers. a. True b. False

Q: Composites are created by combing two or more solid materials to make a new material that has properties that are superior to those of the individual components. a. True b. False

Q: Fiber optics is the branch of science that deals with transmitting data, voice, and images through thin plastic or glass fibers. a. True b. False

Q: Metallic oxides are added to give glass various colors. a. True b. False

Q: Which type of glass is better in high-temperature applications? a. Ordinary glass b. Silica glass

Q: Which type of glass has the higher coefficient of thermal expansion? a. Ordinary glass b. Silica glass c. None of the above

Q: The most widely used form of glass is soda-lime-silica glass. a. True b. False

Q: Silicon is a nonmetallic chemical element that is used in the manufacture of transistors and electronic computer chips. a. True b. False

Q: Silicone is a synthetic compound that is commonly used in lubricants, varnishes, and waterproofing products. a. True b. False

Q: Plastics are often classified into two categories: a. foams and vinyls b. thermoplastics and thermosets c. flexible and rigid d. transparent and opaque

Q: Polymers are the backbone of what we call plastics. a. True b. False

Q: Timber is commonly classified as a. softwood b. hardwood c. medium density fiber d. softwood and hardwood

Q: In general, the higher the density of wood the lower the strength. a. True b. False

Q: Wood is stronger in a direction normal to the grain when it is bent. a. True b. False

Q: In general, under axial loading (when pulled), wood is stronger in a direction parallel to the grain than it is in a direction across the grain. a. True b. False

Q: Wood is an anisotropic material, meaning that its properties are direction-dependent. a. True b. False

Q: Precast concrete slabs, blocks, and structural members are fabricated in less time with less cost in factory settings where surrounding conditions are controlled. a. True b. False

Q: What is normally called concrete consists of three main ingredients: aggregate, cement, and water. a. True b. False

Q: Concrete is commonly reinforced with steel bars or steel mesh to a. increase its rigidity b. increase its weight c. increase its load bearing capacity d. none of the above

Q: Cast iron is considered a ductile material. a. True b. False

Q: The 18/8 stainless steel table ware and kitchen ware products contain a. 18% chromium and 8% copper b. 18% copper and 8% chromium c. 18% chromium and 8% aluminum d. 18% chromium and 8% nickel

Q: High alloy steels contain more than 8% of alloying elements. a. True b. False

Q: Steel is an alloy of iron with approximately a. 2% or less carbon b. 20% or less carbon c. 35% or less carbon d. 50% or less carbon

Q: Bronze is an alloy of copper and tin. a. True b. False

Q: When copper is alloyed with zinc it is commonly called a. brass b. bronze c. aluminum bronze d. zinc-copper

Q: Titanium"‚has an excellent strength-to-weight-ratio. Titanium is used in applications where relatively high temperatures, exceeding 400C up to 600C, are expected. a. True b. False

Q: Aluminum"‚and its alloys have densities that are approximately one-third the density of steel. a. True b. False

Q: Which of the following materials are considered lightweight metals? a. Aluminum b. Titanium c. Magnesium d. All of the above

Q: A fluid's ______________ represents how compressible the fluid is. How easily can one reduce the volume of the fluid when the fluid pressure is increased? a. modulus of rigidity b. density c. viscosity d. bulk modulus

Q: Alcohol has a lower vapor pressure value than water. a. True b. False

Q: Fluids with low vapor pressure values will not evaporate as quickly as those with high values of vapor pressure. a. True b. False

Q: The lower the viscosity value is, the more resistance the fluid offers to flow. a. True b. False

Q: The value of heat capacity represents the amount of thermal energy required to raise the temperature of 1 kilogram mass of a material by 1C. Materials with large heat capacity values are good at storing thermal energy. a. True b. False

Q: The coefficient of linear expansion can be used to determine the change in the length (per original length) of a material that would occur if the temperature of the material were changed. a. True b. False

Q: The strength to weight ratio is defined as a. the ratio of the strength of the material to its weight b. the ratio of the strength of the material to its specific weight c. the ratio of the strength of the material to its mass d. the ratio of the strength of the material to its modulus of elasticity

Q: Concrete is stronger in tension than it is in compression. a. True b. False

Q: Steel is approximately a. two times stiffer than aluminum alloys b. four times stiffer than aluminum alloys c. three times stiffer than aluminum alloys d. ten times stiffer than aluminum alloys

Q: The modulus of rigidity is a measure of how easily a material will stretch when pulled or how well the material will shorten when pushed. a. True b. False

Q: Modulus of elasticity is a measure of how easily a material can be twisted or sheared. a. True b. False

Q: The value of electrical resistivity is a measure of the resistance of material to the flow of electricity. a. True b. False

Q: Material properties depend on many factors, including how the material was processed, its age, its exact chemical composition, and any nonhomogeneity or defect within the material. a. True b. False

Q: In general the properties of materials may be divided into three groups: a. electrical, mechanical, thermal b. viscosity, density, temperature c. resilience, toughness, heat capacity d. none of the above

Q: Most of the mass of the earth comes from the mantle. The mantle is made up of molten rock that lies underneath the crust and makes up nearly 84% of the Earth's volume. a. True b. False

Q: The structure below the earth's surface is generally grouped into four layers; what are they? ______________ ______________ ______________ ______________

Q: As design engineers, whether you are designing a machine part, a toy, a frame for a car, or a structure, the selection of material is an important design decision. a. True b. False

Q: The lines that extend from the points to which the dimension or location is to be specified are known as a. dimension lines b. extension lines c. leaders d. none of the above

Q: The lines that provide information on the size of the object; for example, how wide it is and how long it is are known as a. dimension lines b. extension lines c. leaders d. none of the above

Q: An engineering drawing is dimensioned with the aid of a. dimension lines. b. extension lines. c. centerlines and leaders. d. all of the above

Q: There are basically two concepts that you need to keep in mind when specifying dimensions in an engineering drawing: a. size and location. b. size and material. c. size and tolerance. d. part number and material.

Q: Engineering drawings provide information about a. size, shape, and material of a product. b. dimensions and tolerances. c. surface finish and part number(s). d. all of the above

Q: Shown below is an isometric drawing. Draw the top, front and right side views.

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