A high temperature differential (more than 2 degrees) between return air temperature at the grille and the return air temperature at the unit indicates:

A) Low refrigerant charge. B) Clogged liquid line.
C) Return air leakage. D) Dirty evaporator coil.


C

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Los colectores de vapor suelen ubicarse _____.

a. bajo tierra b. en el ático c. cerca de la caldera d. sobre la pila

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The electric motor is the smallest load used in most heating, cooling, and refrigeration systems.

Answer the following statement true (T) or false (F)

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A unique feature of multizone and double-duct systems is that they:

A) Can deliver conditioned air to different zones. B) Will fit in tight spaces. C) Can heat and cool at the same time using a single air handler. D) Operate more efficiently than most other systems.

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An op-amp circuit has the following values: +V = 9 V, -V = -9 V, Av = 115. Assume that the load will not restrict the output voltage swing. The maximum allowable value for Vin is

A) 21.17 mVpp B) 10.59 mVpp C) 60.87 mVpp D) 157 mVpp

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