Which of the following can cause overheating?

What does the variable-speed motors and drives, copiers, fax machines causes?

What is an Electrical line noise?

The lightning strikes and causes the power lines to about 6,000 volts and damage a server. Which of the following power instability do it describes?

Which of the following is an Under-voltage condition?

Which of the following best describe Spikes and surges?

Which of the following can be described as a blackout?

The power variation is not good for a server or any kind of computer system. Which of them is the most deadly?

Which of the following is a very high voltage level usually twice the normal voltage?

If it was said that was a low voltage condition over a short period of time, which of the following has occurred?