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The maximum cumulative hours for aircrew of an airplane shall not exceed:

a) 100 hours in 30 days
b) 200 hours in 60 days
c) 300 hours in 90 days
d) 400 hours in 120 days

Answer :

Final answer:

The time for one complete cycle of 400-Hz AC power, as used in military aircraft, is 2.5 milliseconds, derived from dividing one by the frequency in Hz.

Explanation:

The question regarding the time for one complete cycle of 400-Hz AC power used in military aircraft is rooted in understanding the principles of alternating current (AC) in physics. The frequency of an AC power supply is calculated as the number of cycles per second. With a frequency of 400 Hz, this indicates the current changes direction 400 times every second.

To find the time for one complete cycle of this power, we use the formula: Time (T) = 1 / Frequency (f). Therefore, for a 400-Hz power supply, the time for one complete cycle is calculated as T = 1 / 400, which simplifies to 0.0025 seconds or 2.5 milliseconds (ms). This rapid cycling contributes to the ability to design lighter-weight electrical equipment for military aircraft, as mentioned.

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