Sound speed in air is approximately
A) 1,000 ft/s.
B) 100 ft/s.
C) 10 ft/s.
D) 1,100 ft/s.
E) 500 ft/s.
D) 1,100 ft/s.
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When working over water, OSHA requires workers to _____.
a. know how to swim b. be secured to something on dry land c. wear a PFD d. be within 6 feet (2 meters) of a life ring
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A heat recovery ventilator is more energy efficient than a balanced ventilation system consisting of an exhaust blower and a supply air blower because:
A) It recovers energy from the compressor. B) It recovers energy from the attic. C) It recovers energy from the exhaust air. D) It recovers energy from the system blower.
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If the low air pressure warning signal is not working
Air brake
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The draft in the furnace is controlled at:
a. 5 psig b. -.5 c. -.05 d. -.02
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