1. Mechanical work is performed when a force moves an object through a distance.
a. True
b. False
2. When work is done on or against an object, it changes the kinetic energy of the object
a. True
b. False
3. An object having a mass m and moving with a speed V has a kinetic energy, which is equal to
a. mV
b. mV2
c. ½ mV2
d. ½ mV
4. Energy is a fundamental dimension.
a. True
b. False
5. Power is a derived dimension.
a. True
b. False
6. Work is found by multiplying force by what other physical quantity?
a. distance
b. mass
c. power
d. time
Test Bank Engineering Fundamentals, 5th ed. Chapter 13
7. What is the SI unit for work?
a. Newtons
b. Watts
c. Kelvins
d. Joules
8. In the U.S. customary system of units, the unit for kinetic energy is
a. lbf.ft
b. lbf.ft/s
c. slugs.ft
d. horsepower
9. If you were to push a lawn mower with a constant horizontal force of 20 N. How much work
do you do while pushing the lawn mower a total distance of 100 m on level ground?
10. What is the SI unit for gravitational potential energy?
a. Newtons
b. Watts
c. Kelvins
d. Joules
11. How much kinetic energy does a 200 g soccer ball have while moving at
s
m
20
toward your
opponents’ goal?
a. 4 Joules
Test Bank Engineering Fundamentals, 5th ed. Chapter 13
b. 40 Joules
c. 80 Joules
d. 8 Joules
12. Which produces the greater change in kinetic energy (assume that all of the work goes into
kinetic energy)?
a. exerting a 10 N horizontal force through a distance of 5 m
b. exerting a horizontal force of 20 N through a distance of 2 m
c. exerting a 30 N horizontal force through a distance of 1.5 m
d. exerting a horizontal force of 40 N through a distance of 1m
13. Which of the following requires the most work done by the brakes of a car?
a. slowing down from
mph80
to
mph55
b. stopping from
mph55
c. equal amounts of work for both
14. A ping pong ball and a bowling ball are moving with the same momentum. Which has the
greater kinetic energy?
a. The ping pong ball
b. The bowling ball
15. What is the SI unit for gravitational potential energy?
a. Newtons
b. Watts
c. Kelvins
d. Joules
16. The change in gravitational potential energy is found by multiplying an object’s change in
elevation by its
a. mass
b. weight
c. density
d. height
17. A stone is dropped from a bridge and allowed to free-fall downward. As it falls a certain
distance its gravitational potential energy decreases by1000 J. By how much does the stone’s
kinetic energy increase? (Neglect air resistance).
a. 100 J
b. 500 J
c. 1000 J
d. 2000 J
18. Calculate the energy required to lift an elevator and its occupants with a mass of 1000 kg
through a vertical distance of 5 m.
a. 5000 J
b. 49000 J
c. 25000 J
d. 2500 J
19. What is the SI unit for elastic energy?
a. Newtons
b. Watts
c. Kelvins
d. Joules
20. In the following equation, what does the k stand for? elastic energy
2
2
1kx=
a. kinetic energy
b. spring constant
c. modulus of elasticity
d. momentum
21. In the following equation, what does the x stand for? elastic energy
2
2
1kx=
a. deflection of a spring from its unstretched position
b. original length of an unstretched spring
c. spring force
d. total length of a stretched spring
22. In the absence if heat transfer and no work, conservation of mechanical energy states that the
total mechanical energy of a system is
a. increasing
b. constant
c. decreasing
d. none of the above
23. Thermal energy transfer occurs whenever there exists a temperature difference within an
object, or whenever there is a temperature difference between two bodies, or a temperature
difference between a body and its surroundings.
a. True
b. False
24. Thermal energy transfer is called
Test Bank Engineering Fundamentals, 5th ed. Chapter 13
a. temperature difference
b. heat difference
c. temperature flux
d. heat
25. What are the SI units for heat?
a. Kelvins
b. Celsius
c. Joules
d. Watts
26. One Btu is
a. nearly equal to 1000 J
b. much smaller than 1000 J
c. much greater than 1000 J
d. none of the above
27. The law that simply states that energy is conserved is
a. the 0th law of thermodynamics.
b. the 1st law of thermodynamics.
c. the 2nd law of thermodynamics.
d. the 3rd law of thermodynamics.
28. Power is found by dividing work by what other physical quantity?
a. distance
b. mass
c. force
d. time
Test Bank Engineering Fundamentals, 5th ed. Chapter 13
29. The time rate of doing work is called
a. energy
b. power
c. force
d. momentum
30. Power can be described as
a. how hard you push.
b. how fast you push.
c. how far you push.
d. how long you push.
31. The SI unit for power is
a. watts
b. joules
c. newtons
d. horsepower
32. A team is more powerful than an individual because
a. the team can do more work than the individual in the same amount of time.
b. the team can do the same amount of work as the individual, but in less time.
c. the team can do more work than the individual in less time.
d. All of the above.
33. A common unit used in the United States in air-conditioning and refrigeration systems is ton
of refrigeration or cooling. One ton of refrigeration represents the capacity of a refrigeration
system to freeze
a. 1000 lbm of liquid water at 32°F into 32°F ice in one hour.
b. 2000 lbm of liquid water at 32°F into 32°F ice in 24 hours.
c. 1000 lbm of liquid water at 32°F into 32°F ice in 24 hours.
d. 2000 lbm of liquid water at 32°F into 32°F ice in one hour.
34. One horsepower represents the power required
a. to lift an object weighing 220 lbf, a distance of 2.5 ft in 1 second.
b. to lift an object weighting 100 lbf a distance of 5.5 ft in 1 second.
c. to lift an object weighting 50 lbf a distance of 11 ft in 1 second.
d. all of the above
35. In general, efficiency is defined as
a. actual output divided by required input.
b. required input divided by actual output.
c. actual output multiplied by required input.
d. actual output minus required input.
36. The largest source of electric power in the U.S. is
a. solar
b. natural gas
c. nuclear
d. coal
e. hydroelectric
f. wind
37. The U.S. natural gas transportation network consists of 1.5 million miles of mainline and
secondary pipelines.
a. True
b. False
38. Solar energy starts with the sun at an average distance of 93 million miles from earth. The
sun is a nuclear fusion reactor, with its surface temperature at approximately 10,000° F (5500°
C).
a. True
b. False
39. A direct passive solar system uses large glass areas on the south wall of a building and a
thermal mass to collect the solar energy.
a. True
b. False
40. A photovoltaic system converts light energy directly into heat.
a. True
b. False
41. Two types of wind turbines are used to extract the energy from the wind, a vertical axis
turbine and a horizontal axis turbine.
a. True
b. False
42. Ethanol is an alcohol-based fuel that is made from the sugars found in corn and barley. Other
sources, such as rice, sugar cane, and potato skins, are also used to produce ethanol.
Test Bank Engineering Fundamentals, 5th ed. Chapter 13
a. True
b. False