Q.3. Give two reasons for overloading and two reasons for short circuit and two precautions to prevent each.

Explain the concept of fault analysis in power systems. How is fault current calculated, and what protection mechanisms are in place?

4.a. Which of the following maintenance practices should be carried out most frequently on motive-powerbatteries?A. Replacing cable insulationB. Replacing the vent capsC. Checking the specific gravity of the electrolyteD. Checking the electrolyte level4.b. During the formation of a lead-acid battery, which of the following takes place?A. The active materials in the negative plate are converted to lead dioxide.B. Lead sponge in the negative plate is converted to lead sulfate.C. Lead sulfate in the positive plate is converted to lead dioxide.D. The active materials in the positive plate are converted to lead sulfate.

A.1. Combination misalignment is caused byA. misalignment by both offset and angle.B. both shafts offset vertically.C. both shafts offset horizontally.D. both shafts being located at an angle.A.2. You can usually check for a leak in a vacuum system by looking at or feelingA. for an air flow along the piping.B. at the exhaust of the vacuum pump.C. at the vacuum gauge at the vacuum pump.D. for signs of dirt on the piping.A.3. When you measure the voltage drop across a set of contacts, you'reA. checking the quality of the contact set.B. sensing how much current is flowing in the circuit.C. measuring the equivalent motor resistance.D. checking the incoming voltages.