What safety measures are used to allow for expansion in a hot water heating system?
What will be an ideal response?
Both temperature and pressure limiting controls are used to maintain the water within safe conditions.
A pressure relief device is supplied in the piping to relieve excess pressure should it occur.
An expansion tank is provided in the piping, partly filled with air, to permit normal expansion and contraction of the water.
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How does air flow in a standing-pilot, natural-draft system?
A) It relies on heat to pull air into the combustion chamber and a fan to remove flue gases. B) It relies on heat to increase the buoyancy of the air to pull air into the combustion chamber and force flue gases into the proper vent. C) It relies on a fan to pull the air into the combustion chamber and blow flue gases out. D) It relies on heat to decrease the convection of the air to pull air into the combustion chamber and force flue gases into the proper vent.
Technician A says that a swashplate pump is sometimes described as a wobble plate. Technician B says that pumping action in a swashplate pump is created when the swashplate rotates. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
In an external gear motor, the motor?s output drive shaft is attached to the _____
a. driven gear b. drive gear c. outlet port d. inlet port
What is meant by the rigging term "hitch"?
What will be an ideal response?