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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