Before checking the switches in the circuit to a nonfunctioning load, the technician should first check:
A) The current draw of the nonfunctioning device.
B) The resistance of the nonfunctioning device.
C) The resistance of all the devices in the same circuit with the nonfunctional device.
D) Line voltage, control voltage, and voltage to the nonfunctional component.
D
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List the model code organizations that existed in the United States prior to the year 2000 and the building codes published by each.
What will be an ideal response?
It takes about _____ for a new pesticide to gain approval
a. 4 years c. 8 years b. 6 years d. 10 years
A balanced three-phase generator has an abc phase sequence with phase voltage Van = 554.3?0° V. The generator feeds an induction motor which may be represented by a balanced Y-connected load with an impedance of 12 + j5 ? per phase. Find the line currents and the load voltages. Assume a line impedance of 2 ? per phase.
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. The triac, like the SCR, must be phase shifted if complete control is to be gained over the AC voltage applied to it. 2. The UJT is an AC operated device. 3. The UJT can be used to supply the trigger pulses for the triac that needs both negative and positive pulses. 4. The capacitor cannot charge until the triac turns off at the end of the half cycle of alternating current. 5. The charge time of the capacitor is determined by the size of capacitor and the amount of resistance connected in series with it.