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Question
Most indoor fluorescent light fixtures contain two or three 40-watt bulbs each. If a classroom has 15 fluorescent light fixtures, each with three 40-watt bulbs, how much does it cost to leave the lights on for a two-hour class? Assume the electric company charges approximately 10 cents per kilowatt-hour.Answer
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Related questions
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In general, the scope of an engineering technologist's work is more application oriented and requires less understanding of mathematics, engineering theories, and scientific concepts that are used in complex designs.
a. True
b. False
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Materials engineers research, develop, and test new materials for various products and engineering applications.
a. True
b. False
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Petroleum engineers apply the laws and principles of chemistry, biology, and engineering to address issues related to water and air pollution control, hazardous waste, waste disposal, and recycling.
a. True
b. False
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Manufacturing engineers develop, coordinate, and supervise the process of manufacturing all types of products.
a. True
b. False
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Good engineers have good grasp of fundamentals and are analytical, detail oriented, and creative.
a. True
b. False
Q:
List at least five traits of good engineers._____________________________________________________________________________________
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What does NASA stand for?
a. North American Space Agency
b. North American Space Administration
c. National Aeronautics and Space Administration
d. National Aero-Space Administration
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For which of the following products are engineers directly involved in the production?
a. Automobiles
b. Notebook paper
c. Bottled water
d. Smart phones
e. Laptop computers
f. Notebook paper
g. All of the above
Q:
The quantity or numerical value within a linear model that shows by how much the dependent variable changes each time a change in the independent variable is introduced is known as
a. the x-intercept.
b. the y-intercept.
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In general, engineering problems are mathematical models of physical situations.
a. True
b. False
Q:
Evaluate:
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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
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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:
________________
________________
________________
________________
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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:
Which type of glass is better in high-temperature applications?
a. Ordinary glass
b. Silica glass
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Silicone is a synthetic compound that is commonly used in lubricants, varnishes, and waterproofing products.
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:
High alloy steels contain more than 8% of alloying elements.
a. True
b. False
Q:
Bronze is an alloy of copper and tin.
a. True
b. False
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
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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
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The lower the viscosity value is, the more resistance the fluid offers to flow.
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
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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:
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:
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.