11. Repeat Problem 10 for the triac circuit in Figure 11–58. The breakover potential is 25 V and IH = 1 mA. FIGURE 11-58 15 V peak R 4.7 kN
Protection System
A system that protects electrical systems from faults by isolating the problematic part from the remainder of the system, preventing power from being cut from healthy elements, improving system dependability and efficiency is the protection system. Protection devices are the equipment that are utilized to implement the protection system.
Predictive Maintenance System
Predictive maintenance technologies are designed to assist in determining the state of in-service equipment so that maintenance can be scheduled. Predictive maintenance is the application of information; proactive maintenance approaches examine the condition of equipment and anticipate when it should maintain. The purpose of predictive maintenance is to forecast when equipment will fail (depending on a variety of parameters), then prevent the failure through routine and corrective maintenance.Condition monitoring is the continual monitoring of machines during process conditions to maintain optimal machine use, which is necessary for predictive maintenance. There are three types of condition monitoring: online, periodic, and remote. Finally, remote condition monitoring allows the equipment observed from a small place and data supplied for analysis.
Preventive Maintenance System
To maintain the equipment and materials on a regular basis in order to maintain those running conditions and reduce unnecessary shutdowns due to unexpected equipment failure is called Preventive Maintenance (PM).
![**Triac Circuits and Silicon Controlled Switches**
**11. Triac Circuit Analysis for Figure 11–58**
Repeat Problem 10 for the triac circuit in Figure 11–58. The breakover potential is 25 V and \( I_H = 1 \, \text{mA} \).
**Figure 11–58 Explanation**
- The graph shows an AC waveform with a peak voltage of 15 V.
- The circuit diagram includes a 4.7 kΩ resistor in series with a triac.
**The Silicon-Controlled Switch (SCS)**
**12.** Explain the turn-on and turn-off operation of an SCS in terms of its transistor equivalent.
**13.** Name the terminals of an SCS.
**The Unijunction Transistor (UJT)**
**14.** In a certain UJT, \( r'_{BB1} = 2.5 \, \text{k}\Omega \) and \( r'_{BB2} = 4 \, \text{k}\Omega \). What is the intrinsic standoff ratio?
**15.** Determine the peak-point voltage for the UJT in Problem 14 if \( V_{BB} = 15 \, \text{V} \).
**16.** Find the range of values of \( R_1 \) in Figure 11–59 that will ensure proper turn-on and turn-off of the UJT. \( \eta = 0.68 \), \( V_\text{V} = 0.8 \, \text{V} \), \( I_\text{V} = 15 \, \text{mA} \), \( I_p = 10 \, \mu\text{A} \), and \( V_p = 10 \, \text{V} \).
**Figure 11–59**
[Description of Figure 11–59 would follow, focusing on circuit diagram details if available.]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F585e4a80-646c-4418-ada9-cb992a2ce44b%2F40955780-187a-4cf3-aa29-bc199d9e9f46%2Ffshpq0d.jpeg&w=3840&q=75)
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