A portable power drive used for pipe threading receives its power from _____.
a. an air compressor
b. an electric motor
c. a gasoline engine
d. the operator
b. an electric motor
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Which of the following will be effective in reducing low frequency noise from a mechanical room?
A) Sound batts in the stud space. B) Mounting the drywall on resilient channels. C) Acoustical liner on the walls.
An elevated material-staging platform is supported by two or more beams called _____.
a. counterweights b. shoring c. truss girders d. outriggers
An air compressor is operating at its maximum practical capacity when it runs for 7 out of every 10 minutes. This is referred to as a 70% ____________________.
Fill in the blank(s) with the appropriate word(s).
Over 90% of replacement radiator hoses are molded hoses.
Answer the following statement true (T) or false (F)