A ventilator can derive its input power from which of the following sources? 1. Alternating current (AC) electricity 2. Battery 3. Pneumatic

a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3


ANS: D
The power source for a ventilator is either electrical energy (Energy = Volts ⋅ Amperes ⋅ Time) or compressed gas (Energy = Pressure ⋅ Volume).

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