Which of the following is a true statement regarding fabric duct systems?
a. The material cost of a fabric duct system is typically 10 percent more than an equal sheet metal duct
system.
b. Fabric duct materials require special cleaning processes using low-pressure steam.
c. Most fabric duct systems are located outside of the conditioned space.
d. Porous versions of duct material stay cleaner since dust cannot easily settle on the duct.
[Ques. 2] NEC Article 430 covers _____.
a. the application and installation of motors
b. provisions for motor-driven equipment
c. general information on grounding
d. thermal protection requirements
[Ques. 3] The most common service factor appearing on a motors nameplate is _____.
a. 1.15
b. 1.5
c. 2
d. 2.15
[Ques. 4] Which of the following motors provides constant speed from no-load conditions to full-load conditions?
a. Series DC
b. Squirrel cage induction
c. Synchronous
d. Shunt DC
[Ques. 5] A wound rotor motor has been recently put back into service but is now rotating in the wrong direction. After
examining the motor, you find that lead L1 is connected to T2, L2 to T3, and L3 to T1. To correct the rotation,
you should:
a. Connect L2 to T1, L3 to T2, and L1 to T3.
b. Connect L1 to T1, L2 to T3, and L3 to T2.
c. Connect L1 to T1, L2 to T2, and L3 to T3.
d. Reverse phase connections between the wound rotor and the resistor bank.
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