Define a vacuum and tell how it is measured

What will be an ideal response?


A vacuum is any pressure less than atmospheric pressure. Mercury columns can be used to measure vacuum by measuring how much pressure has been removed.

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The internal energy of 2 kg of air is reduced by 50 kJ during a cooling process. Initially, the air has a temperature of 40°C. Assuming ideal gas behavior and constant specific heats, determine the final temperature of the air.

Given: m = 2 kg; ?U = -50 kJ; T1 = 40°C What will be an ideal response?

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Most R-134a refrigeration systems use ________ oil for lubrication.

A) PAG B) SAE 30 C) POE D) Mineral

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The tool MOST-Likely used to look at AC generator patterns is a(n):

A. alternator B. lab scope C. diode D. regulator

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The organization responsible for defining the Feature Groups that are used to connect the many long distance carriers with the local telephone companies is the National Exchange Carrier Association of the:

A) FAA B) FCC C) FTC D) ITU

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