PTAC and window unit air conditioners often use rotary compressors, which are effective but susceptible to failure due to high head pressure. What is the most common cause of high head pressure in these units?
A) Metering device failure
B) Dirty evaporator
C) Dirty condenser
D) Incorrect charge
C
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If a crane has three-part reeving, the hoist line is terminated at the _____.
a. load block b. jib c. boom d. hoist sheave
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The true geometric form of a feature at MMC is called:
a. perfect form b. perfect boundary c. boundary of form d. geometric form boundary
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Laminates are ordinarily used in ____ thicknesses.
a.two b.three c.four d.five
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Technician A says that platinum tipped spark plugs should never be re-gapped after they have been used in a running engine. Technician B says that spark plugs should not be removed from a hot cylinder head. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
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