EPA 608 Type 3 Exam Practice Test 8

Question 1: If a large vacuum pump is used during evacuation …………….

• It may cause freezing of trapped water
• The evacuation process will speed up
• The refrigerant may get freeze in the evacuation hoses

Question 2: In low pressure system whether the refrigerant can go out of the system?

• Yes
• No

Question 3: Under which of the following condition it is better start charging using liquid refrigerant?

• When refrigerant saturation temperature reaches 360 F
• When the refrigerant saturation temperature reaches 56 0F
• When the temperature of water is above 360F
• When the temperature of water reaches 560F

Question 4: Heating a refrigerant bottle will speed of ………………………….

• Vapour charging
• Liquid charging

Question 5: Which of the following recovery method does not pull the oil from the system during evacuation?

• Vapour recovery
• Liquid recovery

Question 6: A partial charge low pressure system can be effectively leak checked by ……………

• Compressed air
• Pressurized liquid nitrogen
• Adding high pressure HCFC-22 refrigerant
• Increasing refrigerant pressure by adding external heat source.

Question 7: Which of the following is a boiling temperature of a R-11 refrigerant at a pressure of 14.7 PSIA?

• 60.3 F
• 70.5 F
• 74.5 F
• 84.5 F

NEC Reference: NEC 14.7

Question 8: In a low pressure refrigeration system the rupture disk is connected to ………………..

• Evaporator
• Condenser
• Receiver
• Liquid pump

Question 9: If the liquid charging into the refrigeration system is under 29 Hg vacuum then ………………….

• The charging time increases
• The water in the system freezes
• The refrigerant may freeze in the system
• The vapour in the system freezes

Question 10: The purge compressor is typically connected on top of ………………. In low pressure chiller refrigeration system.

• Condenser
• Oil separator
• Chillier
• Purge drum