Pipe threads, when used on pipe that will contain liquid or vapor under pressure, ____.
A. are tapered
B. should have at least seven perfect threads
C. generally have a "V" shape
D. all of the above
Answer: D
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A humidifier should cycle with the blower in the heating unit.
Answer the following statement true (T) or false (F)
Which of the following statements about zoned systems is correct?
A) One thermostat controls all the motorized valves in the system. B) Zoned systems are only used for commercial buildings. C) Water flow in zoned systems is controlled by a motorized valve. D) Individual zone temperature control is not available in zoned systems.
A(n) ____ is a radiation thermometer that determines an object's surface temperature by measuring the temperature of the electromagnetic (EM) radiation being emitted from the object.
A. multimeter B. voltmeter C. ohmeter D. pyrometer
OBD II has been on all passenger vehicles in the United States since ________
A) 1996 B) 1991 C) 2000 D) 1986