Question
For items 7 through 12, answer true (T) or false (F).One rule for bell circuits is to connect a conductor from the pushbutton to the bell that is to be controlled.____
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The statement is about a rule for bell circuits, specifically regarding the connection between a pushbutton and the bell. Show more…
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True-False 1. PLC hardware problems require knowledge about troubleshooting incoming power, PLC input sections or modules, input devices, PLC output sections or modules, and output components. 2. Measuring the circuit resistance is the best way of determining the load on a circuit. 3. In general, circuit current should not exceed 25% of the fuses or circuit breaker rating for the best circuit performance. 4. The first step used to test fuses with an ohmmeter is to turn power to the circuit OFF and lock and tag out the disconnect. 5. Circuit breakers perform the same function as fuses and are basically tested the same way. 6. When loads are connected to a PLC that exceed the current rating of the PLC output power supply, the voltage output of a PLC will increase. 7. Digital input devices are the most common type of input device because they represent the largest group of mechanical and solid-state switches. 8. Opto-isolating circuits only allow signals to flow in one direction. 9. To determine if there is a leakage current problem, measure the OFF-state leakage current and compare that value to the specified minimum operating current of the PLC input section or module. 10. Timer instruction requires knowledge of which test instruments to use, how to use test instruments, where to connect test instruments, and what each measured value means. 11. In most circuits in which the load is rated at 115 VAC, the control circuit is operated at a lower voltage level than the loads. 12. Grounding the input section or module of a PLC requires knowledge of how the programmed circuit should be operating and how the PLC input section or module works. 13. In a solid-state switch, there are no moving contacts. 14. All PLCs have output terminals that circuit components (loads) are connected to. 15. A PLC only turns output components (loads) ON and OFF according to analog signals.
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