A purely inductive load of 10 ? is connected to an ac source of 120 V (rms) through a half-wave SCR circuit.
a. If the SCR is triggered at 90o, calculate the angle at the maximum instantaneouscurrent.
b. If the triggering angle is changed to 120o, calculate the angle at the maximum
instantaneous current.
c. Calculate the conduction period for the case in (b).
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An energy-saving routine used with VAV systems that is active in the unoccupied hours of the early morning is called _____.
a. morning warm-up b. night-time free cooling c. building pressurization d. demand-control ventilation
_____ uses a tubular filler wire much like the traditional FCA welding wire, but the filler is mostly metal powder that provides alloying elements and filler metal for an improved weld mechanical property.? ?
A. Metal cored FCAW? B. Modulated current GMAW? C. PAW? D. SAW?
For any probability distribution, the sum of probabilities is always
a. 0 b. 0.5 c. 1 d. equal to the standard deviation.
When delegating, the crew leader should make sure the crew member understands what to do and _____
a. the degree of risk involved b. their level of responsibility c. who should be blamed if there is a problem d. has read the OSHA regulations