# Spread time is defined as the interval during which

Electrical Engineering XYZ MCQ

Spread time is defined as the interval during which:

1. Anode current rises from 90 % to its final value
2. Anode current rises from 10 % to 90 % of its final value
3. Both of these
4. Anode voltage drops from 10 % of its initial value to zero

Correct answer: 1. Anode current rises from 90 % to its final value

Explanation: In the context of electronics, especially in the operation of electronic devices like vacuum tubes or semiconductor devices, “spread time” typically refers to the time interval during which certain parameters of the device change from one percentage to another of their final values.

In the case of vacuum tubes, such as diodes or triodes, spread time often refers to the time taken for the anode current to rise from a certain percentage of its initial value to another percentage, typically from 10% to 90% of its final value. This is because the anode current is a critical parameter in the operation of such devices and understanding its behavior during the transition phase is important for proper functioning.

The other options presented are incorrect:

• Anode current rising from 90% to its final value doesn’t define spread time, but rather indicates the latter part of the transition.
• Anode voltage dropping from 10% of its initial value to zero doesn’t directly relate to spread time. While it’s an important parameter, it’s not what spread time specifically refers to.