FREE AND STUDY GAMES ABOUT HVAC 100 MIDTERM REV

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FREE AND STUDY GAMES ABOUT HVAC 100 MIDTERM REV

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -34 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Noncondensable gases

Answer:

Are undesirable in a refrigeration system Question 2: The abbreviation for refrigerants containing fluorine, carbon, and hydrogen is?

Answer:

HFC Question 3: Filler materials used in the connection of copper joints are composed of?

Answer:

15% to 60% silver

Question 4: A micron gauge is used to measure

Answer:

Absolute pressures below 1mm Hg

Question 5: For cleaning ACR copper tubing before soldering, a material that can be used is:

Answer:

Sand Cloth Question 6: Which type of refrigerant has the HIGHEST Ozone Depletion Potential (ODP)?

Answer:

CFC Question 7: As the temperature of a material increases, the molecules in the material ____?

Answer:

Travel faster

Question 8: Which of the following is an example of an HCFC refrigerant?

Answer:

R-22 Question 9: If the temperature remains constant and the volume that the gas occupies increases, the pressure will ____?

Answer:

Decrease Question 10: The size indicated for the diameter of L type copper tubing used for plumbing is the approx.

Answer:

Inside dimension

Question 11: The unit used to measure electrical power is

Answer:

Watts Question 12: To reprocess refrigerant to meet new product specifications is called?

Answer:

Reclaim

Question 13: A multiple evacuation means that ___

Answer:

You pull a vacuum on a refrigeration system more than once, allpwing refrigerant or nitrogen into the system between each procedure.Question 14: To pull a vacuum means to:

Answer:

Lower the pressure in a refrigeration system below atmospheric

Question 15: A vapor material exerts a pressure or force

Answer:

In all directions

Question 16: The standard atmospheric pressure at sea level is?

Answer:

29.92" Hg

Question 17: One watt of electrical energy is equal to

Answer:

3.413 Btu Question 18: The proper type of flame from an oxy-acetylene torch for silver brazing is?

Answer:

A neutral flame

Question 19: When soldering or brazing, the solder is?

Answer:

Melted by heat from the tubing and fitting Question 20: The amount of heat needed to change the temperature of a substance will vary with the type of substance. This heat quality is called the ____ of the substance.

Answer:

Specific heat

Question 21: To remove the refrigerant from a system without any testing or processing and to be put back into the same system is called?

Answer:

Recovery Question 22: Moisture in a liquid state must be ____ before it can be removed with a vacuum pump.

Answer:

Vaporized

Question 23: Which of rhe following refrigerants is a CFC-type refrigerant?

Answer:

R-12

Question 24: How many watts of electrical power are equal to 1 horsepower?

Answer:

746 Question 25: At a constant pressure, the volume of gas varies as to the absolute temperature and at a constant volume the pressure of the gas varies directly with the absolute temperature.This is known as ____?

Answer:

Charle's Law Question 26: Molten solder flows between the two base metals being soldered because of?

Answer:

Capillary Action

Question 27: Brazing is done at ____ soldering

Answer:

Higher temperatures than Question 28: The volume of gas varies inversely with the absolute pressure, provided the temperature remains constant. This is called ___?

Answer:

Boyle's Law