What can happen if the air pressure gets too low in an air brake system
A. The brakes may squeak.
B. The brakes may stop working.
C. The brakes may be sluggish.
Ans: B. The brakes may stop working.
Explanation
Pressing and releasing the brake pedal unnecessarily can let air out of the braking system faster than the compressor can replace it. Air brakes may cease to work effectively if the pressure becomes too low
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What is unique about the internal discharge-temperature safety devices in some scroll compressors?
a. They are set to open at a cooler temperature than the external overloads. b. The excessive pressure is vented to the atmosphere. c. Once activated, they can never operate again. d. Some are actually valves that bypass refrigerant
The ____________________ thermostat is commonly used to control the temperature of any medium, whether liquid or vapor, in many applications.
Fill in the blank(s) with the appropriate word(s).
Cartridge fuses used for branch circuit protection must be marked with the ampere rating, voltage rating, and
the _____. a. date manufactured b. dimensions c. expiration d. interrupting rating
At what temperature does brazing take place?
A) Less than 840°F B) Above 1,800°F C) Above 840°F D) Less than 400°F