Special handling procedures for MOS, all power supplies should be checked to ensure that excessive voltage transients of what do not occur when systems are energized or de-energized?

Special handling procedures for MOS, all power supplies should be checked to ensure that excessive voltage transients of what do not occur when systems are energized or de-energized?

• A. 0-5 volts
• B. 120-240 volts
• C. 70-100 volts
• D. 1-10 volts

Answer: (C)

Voltage transients during power-up and power-down come from switching and inductive loads, and they can stress components if they spike too high. For MOS devices and associated power supplies, you want those spikes kept within a safe ceiling so the insulation and semiconductor junctions aren’t overstressed. In this equipment, that ceiling is in the range of about seventy to one hundred volts. Keeping transients within this limit helps prevent damage to MOS devices, arcing, and insulation breakdown when energizing or de-energizing the system. The other options would either be too small to tolerate normal switching surges or are outside the typical operating environment, making them inappropriate.

Voltage transients during power-up and power-down come from switching and inductive loads, and they can stress components if they spike too high. For MOS devices and associated power supplies, you want those spikes kept within a safe ceiling so the insulation and semiconductor junctions aren’t overstressed. In this equipment, that ceiling is in the range of about seventy to one hundred volts. Keeping transients within this limit helps prevent damage to MOS devices, arcing, and insulation breakdown when energizing or de-energizing the system. The other options would either be too small to tolerate normal switching surges or are outside the typical operating environment, making them inappropriate.