Question

(APU limits) Generator frequency: _____ with a maximum oscillation of _____ about a mean value within the _____ hertz band.

Option 1: 400Hz, 10Hz, 390-410Hz
Option 2: 380Hz, 20Hz, 360-380Hz
Option 3: 360Hz, 15Hz, 345-375Hz
Option 4: 420Hz, 5Hz, 415-425Hz

Answer 1

The correct option is Option 1: 400Hz, 10Hz, 390-410Hz. The generator frequency is 400Hz, with a maximum oscillation of 10Hz about a mean value within the 390-410Hz band.

Step-by-step explanation:

The correct option for the question is Option 1: 400Hz, 10Hz, 390-410Hz. This means that the generator frequency is 400Hz, with a maximum oscillation of 10Hz about a mean value within the 390-410Hz band.

In the context of electrical power, frequency refers to the number of complete cycles or oscillations of an alternating current (AC) per second. So, in this case, a frequency of 400Hz means that there are 400 complete cycles of the AC power per second.

The maximum oscillation of 10Hz refers to the range within which the frequency can vary above or below the mean value of 400Hz. In this case, the frequency can oscillate between 390Hz and 410Hz.