Which motor is described as totally enclosed and furnished for exterior cooling by a fan integral with the motor?

• A. Totally Enclosed Motor
• B. Totally Enclosed Fan-Cooled Motor
• C. Open Motor
• D. Explosionproof Motor

Answer: (B)

The thing being tested is how motor housings and cooling are described. A motor that is fully enclosed to protect the windings and has a fan mounted on the motor to push air across the exterior for cooling is designed for exterior cooling with the fan integral to the motor. This combination is what engineers call a totally enclosed fan-cooled motor. The enclosure keeps out dust, moisture, or debris, while the fan—mounted on the motor itself—removes heat by circulating outside air over the motor surfaces. That setup is ideal for outdoor or harsh environments where you want reliable cooling without letting contaminants enter the motor.

Other types don’t match this description precisely: a totally enclosed motor lacks the specific fan-forced exterior cooling feature; an open motor isn’t enclosed at all and relies on free ventilation; and an explosionproof motor is built for hazardous locations and specifies protection for flame containment rather than the particular exterior fan cooling arrangement described here.