Technology: Engineering & Design

Chapter 10: Power Systems

Self-Check Quizzes

1.
An engineer is designing a vehicle and wants to connect unaligned shafts in the power train. What could he or she use?
A)wedge
B)gear
C)universal joint
D)solenoid
2.
Which phrase describes a screw?
A)two inclined planes coming to a single point
B)inclined plane spiraling around a shaft
C)bar that rests on a pivot point
D)grooved wheel that carries a rope or belt
3.
Which statement about the load in a power system is not true?
A)It includes the initial resistance that must be overcome.
B)It means about the same as the work to be done.
C)It is the system's source of energy.
D)It includes the force output.
4.
To which type of power system is Boyle's law applicable?
A)hydraulic
B)pneumatic
C)mechanical
D)electronic
5.
Which phrase describes a lever?
A)bar resting on a pivot point called a fulcrum
B)bar connected to a gear
C)bar used as a ramp
D)bar used as an axle shaft with a wheel
6.
Which unit is used to measure cycles per second of alternating current?
A)newton
B)volt
C)hertz
D)amp
7.
Wheels with teeth can mesh and transfer force, possibly increasing speed or power. One of these toothed wheels is called a
A)gear.
B)direct drive.
C)clutch.
D)pulley.
8.
Which correspondence between electrical power source and type of output current is incorrect?
A)car battery—AC
B)nuclear power generating station—AC
C)coal-fired power generating station—AC
D)lithium watch battery—DC
9.
Mechanical advantage can be defined as
A)force expended in a specific period of time.
B)the transfer of force throughout a power system.
C)how much a machine multiplies human strength.
D)the superiority of mechanical systems over electrical systems.
10.
A simple home power mower transmits turning force directly from the engine crankshaft to the rotary cutting blades. This type of mechanical power system is called
A)stick shift.
B)direct drive.
C)sprocket-and-chain.
D)automatic transmission.
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