50. It is the resistance of a material when there is no supply. Hot Resistance Infinite Resistance Cold Resistance Irresistible 49. What is the phase sequence of a three-phase motor for which Van = 220∟-100, Vbn=220∟140 abc acb aab bba 48. The prefix pico stands for: 10^-9 10^9 10^12 10^-12 47. A source is connected to three loads Z1, Z2 and Z3 in parallel. Which of these is not true? P = P1+P2+P3 S = S1+S2+S3 Q = Q1+Q2+Q3 all are true 46. The Thevenin impedance of a network seen from the load terminals is 80+j55 ohm. For maximum power transfer, the load impedance must be: 80+j55 -80+j55 -80-j55 80-j55
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).
- Hot Resistance
- Infinite Resistance
- Cold Resistance
- Irresistible
49.
- abc
- acb
- aab
- bba
48. The prefix pico stands for:
- 10^-9
- 10^9
- 10^12
- 10^-12
47. A source is connected to three loads Z1, Z2 and Z3 in parallel. Which of these is not true?
- P = P1+P2+P3
- S = S1+S2+S3
- Q = Q1+Q2+Q3
- all are true
46. The Thevenin impedance of a network seen from the load terminals is 80+j55 ohm. For maximum power transfer, the load impedance must be:
- 80+j55
- -80+j55
- -80-j55
- 80-j55
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