In the designator 600S162-54, the 54 represents _____.
a. web depth
b. base steel thickness
c. type of framing member
d. flange depth
[Ques. 2] Dropping or piling steel framing members on top of an electrical extension cord could create a(n) _____.
a. tripping hazard
b. fire hazard
c. unusable framing member
d. electrical hazard
[Ques. 3] Which of the following statements is true?
a. If an HVAC contractor detects an IAQ problem during routine maintenance, the contractor should
immediately inform the customer about the problem in writing.
b. HVAC contractors have no liability for system repairs that do not meet local code requirements if the
code was changed before the repairs were completed.
c. Occupants of a building who claim to suffer from sick building syndrome may sue the owner of the
building, but not the HVAC contractor, for damages.
d. The International Building Code requires that HVAC contractors assume unlimited liability when
retrofitting existing systems.
[Ques. 4] Which type of motor braking is often used with AC motors being controlled by a variable frequency drive?
a. DC electric
b. Friction
c. Dynamic
d. Electromechanical
[Ques. 5] Sequential energizing of an ECM's motor windings provide _____.
a. protection from single-phasing
b. rotation of the rotor
c. protection from voltage spikes
d. AC voltage rectification