A weeping relief valve on a hot water boiler may be an indication of
A) An extinguished pilot light
B) A water-logged expansion tank problem
C) A circulating pump that is running continuously
D) Low return water temperature
Q. 2What materials are boilers commonly made from?
A) Most boilers are either cast iron or brass B) Most boilers are either aluminum or copper
C) Most boilers are either steel or aluminum D) Most boilers are either cast iron or steel
Q. 3What kind of expansion tank must be installed above the highest terminal unit?
A) diaphragm-type B) closed-type
C) pressure-relief type D) open-type
Q. 4What is the minimum desired return water temperature for a gas fired boiler?
A) at least 180F returning to the boiler B) at least 80F returning to the boiler
C) at least 140F returning to the boiler D) at least 100F returning to the boiler
Q. 5What is a pickling solution?
A) A thread sealant that stands up to boiler duty
B) A water additive that is used to improve heat transfer
C) The circulating water in a hydronic heating system
D) A corrosion inhibitor used on steel pipes
Q. 6A system with an inefficient compressor will operate with:
A) A high suction pressure and a high head pressure.
B) A low suction pressure and a low head pressure.
C) A high suction pressure and a low head pressure.
D) A low suction pressure and a high head pressure.
Q. 7The contactor on most residential split system condensing units controls is:
A) The compressor, condenser fan motor, and evaporator fan motor.
B) The compressor.
C) The compressor and the condenser fan motor.
D) The condenser fan motor.
Q. 8Documenting all the work performed:
A) Keeps the customer informed. B) Protects you legally.
C) Is required by law. D) Helps to generate the bill.
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