The following products have inherent dangers while being used. Identify the danger and develop ideas to overcome or limit it:
a. electric toaster
b. electric hedge trimmer
c. chain saw
d. incandescent light bulb
For electric toasters, hot surfaces are a problem. Include material that changes color a high temperatures to alert users to the potential for burning. Electric hedge trimmers have an interlock, so the trimmer must
be purposefully turned on so it runs continuously. The concern is that if the operator lets go of the trimmer, it will stop running. A chain saw is dangerous and again features exist to stop it should the cutting bar start to seize or to seize and jerk back. Any operator release should cause the machine to
stop functioning. An incandescent bulb gets hot. Having a small thermal indicator showing that it is hot, particularly when it is no longer turned on, would be useful.
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When heavier liquid fuels are used, heat must be applied to reduce _________.
A. density B. viscosity C. temperature D. pressure
Technician A says that spring-applied hydraulically-released brake circuits apply the brakes when brake pressures become too high. Technician B says that the brakes apply if there is a loss of electrical power or if transmission clutch or torque pressure falls below safe operating levels. Who is correct?
A. Technician A B. Technician B C. Both D. Neither
Metric wire size is measured in units of ________
A) Cubic centimeters B) Meters C) Square millimeters D) Cubic millimeters
How does a cooling tower remove energy from the water it is circulating?
A) It cools the refrigerant by evaporating a small portion of the refrigerant to the air. B) It cools the water flowing through it by passing it over ice that is made during off-peak hours. C) It cools the water flowing through it by evaporating a small portion of the water. D) It cools the water flowing through it by using a separate compression refrigeration system.