Relay Circuit Questions - Job #2
Here are questions about this relay circuit. You may consult the
assignment text, diagram, picture, and lecture. You may also use a
dictionary, theory book, and code book as you feel necessary. This in intended
as a learning experience.
Questions
1. Why must power be supplied to the photo cell at all times?
2. Why must power be supplied to the timer motor at all times?
3. What is the advantage of adding a magnetic relay to this circuit rather
than let the photo cell and timer carry the load?
4. How must the time clock settings be adjusted to result in this relay coil
going on at sunset and off at 12 midnight?
5. If the magnetic coil relay is to remain energized during all darkness
hours, what function will a timer perform?
6. What settings on the time clock would allow the magnetic relay coil to
energize at midnight and deenergize at 6AM?
7. Is a photo cell necessary for the situation described in question #6?
8. If the photo cell is rated for 1500 watts, and the contacts on the
magnetic relay are rated at 30 amps, what continuous load can be controlled with this relay
circuit of the supply voltage is 120 volts?
9. If the magnetic coil is rated at 120 volts, what must be the voltage
rating for the clock motor?
10. After a power outage, what maintenance action is needed for this relay
circuit to return to proper time?
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