What type of detector uses ultrasonic waves to detect changes in the density of the fluid traveling through the pipe?
A) Electronic leak detector B) Fluorescent dye leak detector
C) Ultrasonic-type leak detector D) Electronic sight glass
[Ques. 2] Which of the following is TRUE of a medium-temperature refrigeration unit?
A) It requires 1 hp to produce 1-1/3 tons of cooling.
B) It requires 1 hp to produce 1 ton of cooling.
C) It requires 1 hp to produce 2/3 ton of cooling.
D) It requires 1 hp to produce 1/3 ton of cooling.
[Ques. 3] Why is a large refrigerant leak potentially dangerous?
A) Most common refrigerants used in residential systems are highly toxic.
B) Most common refrigerants used in residential systems are highly corrosive.
C) Most common refrigerants used in residential systems are highly flammable.
D) They can replace all of the oxygen, leading to asphyxiation.
[Ques. 4] Which of the following is used for piping natural gas?
A) Black iron B) White iron C) Copper D) Galvanized iron
[Ques. 5] Assuming they both have the same condenser temperature, which application requires more horsepower to produce a ton of cooling: a 0F evaporator, or a 40F evaporator?
A) The 40F evaporator, because of its higher pressure
B) The horsepower requirement per ton of cooling is not affected by the evaporator temperature.
C) The 0F evaporator, because of the higher pressure difference
D) The horsepower requirement is too complicated a calculation to make any valid comparison based only on evaporator and condenser temperatures.
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