A device that when attached to an alternating current electric motor whose load varies saves energy by changing motor speed is a(n) __________________
A. VFD
B. Ballast
C. Inverter
D. across the line starter
A
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____ systems control the operation of several cars that serve the same floors using a supervisory control system.
A. Group automatic B. Single automatic C. Typical operator-controlled D. Selective collective automatic
Technician A says that a quick check of A/C system operation is to feel the temperature of the suction and discharge lines. Technician B says that the suction line should be cold and the discharge line hot after 5 minutes of system operation. Who is
correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
Convert decimal 59.72 to BCD
A) 1110.11 B) 0101100101110010 C) 111011 D) 01011001.01110010
Extremely thin sheet metal thicknesses are referred to as foil or leaf.
Answer the following statement true (T) or false (F)