A line that indicates both magnitude and direction is a _____.

A. linear
B. vector
C. scalar
D. exponential


Answer: B

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Referring to the following figure, a work order indicates no A/C cooling. The blower motor is found to operate correctly. Which of the following could be the cause?

A. Blown fuse F12 B. Low A/C refrigerant level (low pressure in system) C. Open circuit A77-GB D. Both B and C

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Heat flows from the product into the evaporator because:

A) The refrigerant in the evaporator has a lower specific heat than the product. B) The evaporator is at a lower pressure than the product. C) The evaporator is at a lower temperature than the product. D) The refrigerant in the evaporator has fewer Btus/lb than the product.

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The plastic or foil sleeve on the outside of a branch duct in a crawl space serves as _____

a. thermal insulation b. a vapor barrier c. a noise suppressor d. a fire retardant

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How do you calibrate a mercury thermometer when the numbers are etched on the stem?

What will be an ideal response?

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