Which of these is used to check the fluid level?
A) A
B) B
C) Either A or B can be used
D) Both must be removed to check the fluid level
A) A
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NEC Article 770 covers the requirements for _____.
a. communications circuits b. fiber-optic circuits c. network-powered broadband circuits d. community antenna television systems
Direct-expansion coils operating below the dew point of the entering airstream will:
A) Cool the water vapor (humidity) in the air and condense it as droplets on the coil. B) Expand the water vapor (humidity) in the air and condense it as droplets on the coil. C) Warm the water vapor (humidity) in the air and condense it as droplets on the coil. D) Cool the water vapor (humidity) in the air and expand it as droplets on the coil.
What material, used in friction linings, may cause lung damage with repeated exposure?
A) Fiberglass B) Carbon fiber C) Asbestos D) Ceramic fiber
?Why is creosote dangerous?
A. ?It is difficult to clean up. B. ?It is a product of incomplete combustion. C. ?It decreases thermal efficiency. D. ?It is toxic when touched.