Safe methods of heating a refrigerant cylinder during charging include which of the following? (You may select more than one.)
A) An oxyacetylene torch with a rosebud tip B) Boiling water
C) An electric cylinder heater D) Warm water
E) An air acetylene torch adjusted to a low flame F) Warm condenser discharge air
C, D, F
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What sounds are associated with improperly lubricated fan bearings?
A. Whirling sounds B. Swishing sounds C. Grinding sounds D. High-pitched sounds
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____________________ specifications often result in lower construction costs because the bidder has more freedom to select materials and methods
Fill in the blank(s) with correct word
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Silk probably originated in:
a. Greece c. India b. Egypt d. China
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Which of these is a term used to describe when information is added to a constant frequency?
A) Modulation
B) Frequency
C) Period
D) Carrier wave
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