One principle that makes heat pump operation possible is:

A) Air velocity over a coil will create friction, raising the temperature of the coil.
B) Heat will flow up hill when subjected to a strong magnetic field.
C) The temperature at which a material boils depends on its pressure.
D) Moving heat quickly through a cold object will create thermal induction, drawing in heat from the colder surroundings.


C

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El símbolo de material marcado con la letra A en la Figura 1 representa _____.

a. concreto b. piedra c. aislante d. madera

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When the planetary carrier is held, the gear set produces which of the following conditions?

A. Neutral B. Gear reduction C. Overdrive D. Reverse gear

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Name the process of joining two or more pieces of like metals by heating the material to a temperature high enough to cause softening or melting.

What will be an ideal response?

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What does "PPE" refer to in regards to the WPS?

What will be an ideal response?

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