Why should you allow a refrigeration system to operate at least 15 minutes before reaching any conclusions?
What will be an ideal response?
It takes up to 15 minutes for a refrigeration system to stabilize/reach equilibrium.
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All of the following are common lockout/tagout safeguards, except _____.
a. lock and tag all electrical equipment b. never operate any device, valve, switch, or piece of equipment that has a lock or tag attached to it c. use only tags that have been approved for your job site d. tag motorized vehicles only when there will be multiple users
Technician A says that during engine disassembly, all main and rod bearings should be kept in order in case they will be reused. Technician B says that there is no need to keep bearings in order if new parts are to be used. Who is right?
A. Technician A B. Technician B C. Both technicians D. Neither technician
The type of insulation that requires a 3/4 inch space between other materials and itself is _____.
a.rigid b.reflective c.loose-fill d.foamed-in-place
What is required when installing a 90% furnace that is not required for an 80% furnace?
A) An oxygen line for the combustion gas afterburner B) A catalytic cell for the combustion gas catalytic converter C) An extra large supply duct to handle the extra heat output D) A drain for the condensate from the recuperative coil