When an A/C system is set to ''recirculate'' the inlet air for the evaporator comes from __________
A) Outside the vehicle
B) Inside the vehicle
C) Both of these
D) Neither of these
B) Inside the vehicle
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Which of the following can provide motor overload protection but have the disadvantage of being nonrenewable?
a. Dual-element or time-delay fuses b. Circuit breakers c. Solenoids d. Overload relays
Which of the following lamp types is generally the most energy efficient?
A) Incandescent. B) LED. C) High intensity discharge. D) Fluorescent.
A weatherproof enclosure designed to give protection from falling dirt, rain, snow, sleet, and windblown dust is classified as a _____ enclosure and will need to be installed for outside applications.
a. NEMA 1 b. NEMA 2 c. NEMA 3R d. NEMA 12
Electro-mechanical control systems operate by
A) processing electronic signals with a microprocessor B) providing a varying DC voltage in response to monitored conditions C) turning relay coils on or off to complete circuits D) providing a modulating air pressure in response to monitored conditions