A tachometer is used to measure:
A) Energy use. B) Air velocity. C) Wind speed. D) Rotational speed.
[Ques. 2] When debrazing a joint on a refrigeration system, often:
A) The oil fumes will ignite when the joint is opened.
B) The residual refrigerant will crystallize around the tube outlet.
C) The vacuum created by the flames will cause a quick inward suction when the tube is pulled.
D) The exiting fumes will extinguish the torch flame.
[Ques. 3] Most hot water boilers heat the water up to temperatures of:
A) 200F to 250F. B) 100F to 150F. C) 180F to 200F. D) 280F to 300F.
[Ques. 4] What is the purpose of using an outdoor ambient thermostat on a heat pump installation?
A) To cycle the heat pump based on the outside temperature instead of the inside temperature
B) To prevent the heat pump from operating in heat unless it is cold outside
C) To bring the heat pump on early if the temperature drops
D) To prevent the auxiliary heat from operating above the system balance point
[Ques. 5] To ensure correct operation, how often should the nozzle be replaced?
A) Every year B) Every 18 months C) Every 6 months D) Every 3 years
Quick Reply
