Name five devices used in the HVAC industry that can be controlled by a relay.
What will be an ideal response?
Relays can be used to control indoor fan motors, condenser fan motors, damper motors, starting capacitors, and control lockouts.
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A solid body at initial temperature T0 is immersed in a bath of water at initial temperature Tw0. Heat is transferred from the solid to the water at a rate 
, where K is a constant and Tw and T are instantaneous values of the temperatures of the water and solid. Develop an expression for T as a function of time ?. Check your result for the limiting cases, ? = 0 and ? = ?. Ignore effects of expansion or contraction, and assume constant specific heats for both water and solid.
What will be an ideal response?
Los fusibles de un elemento tienen una velocidad de respuesta _____ ante condiciones de sobrecorriente
a. baja b. media c. ligeramente superior a la media d. muy alta
When the piston reaches the top of its stroke, the volume of the combustion chamber is at its ?_____ and is called top dead center
A) greatest? B) strongest? C) smallest? D) weakest
Stress risers are most detrimental when they are located on the _____.? ?
A. groove? B. notch? C. weld pass? D. surface?