HVAC Air Conditioning Practice Test 1

Question 1: Which of the following is called as humidification?

• Adding moisture to air
• Removing moisture from air
• Adding heat to the air
• Removing heat from the air

Question 2: The saturation temperature of any given quantity of water vapor at atmospheric pressure is called as ………..

• Dew point
• Boiling point
• Freezing point
• Melting point

Question 3: The amount of heat contained in the water vapor of air is called as ………….

• Latent heat
• Sensible heat
• Dew heat
• Heat capacity

Question 4: What is the function of return duct in air conditioning system?

• Returns the air from the air-conditioned rooms back to central supply rooms.
• It aids the supply fan to provide the air for corners of the building
• It is used to exhaust air from the building
• Provides outside air to the building

Question 5: What is the air pressure at standard atmosphere?

• 14.7 inches of mercury
• 14.7 psi
• 29.9 pounds per square inch
• 29.7 psia

Question 6: How much of atmospheric pressure will decrease with increase in altitude of 1000 feet?

• ½ lb
• 1 lb
• 1 ½ lb
• 2 lb

Question 7: When a steam gauge measures the pressure in the boiler is 6 lbs, what is its equivalent absolute pressure in the boiler?

• 20.7 lbs
• 35.9 lbs
• 6 lbs
• 8.7 lbs

NEC Reference: NEC 14.7

Question 8: The vaporization pressure of liquid ……………. As the pressure on the liquid increases?

• Increases
• Decreases
• Remains unchanged

Question 9: Which of the following meter is used to measure relative humidity?

• Psychrometer
• Thermometer
• Barometer

Question 10: According to ASHRAE, which of the following are the outside fresh air requirements?

• 10 cfm to 20 cfm
• 20 cfm to 40 cfm
• 5 cfm to 10 cfm
• 8cfm to 10 cfm