Propeller reverse: how many times clockwise does it rotate?

Propeller reverse: how many times clockwise does it rotate?

• A. Clockwise 1 1/4 times
• B. Clockwise 1 1/8 times
• C. Counterclockwise 1 1/8 times
• D. Clockwise 1/2 times

Answer: (B)

The idea being tested is tracking the total angular displacement by adding up how far the propeller turns in each phase, paying attention to direction. For each phase, convert the time and speed into revolutions (revolutions = RPM × time / 60), and assign a sign: clockwise as positive, counterclockwise as negative. Add all the clockwise contributions and subtract the counterclockwise ones. The net result in this problem turns out to be a clockwise total of 1 and 1/8 revolutions, which is why the correct answer states clockwise 1 1/8 times. The other options would require different sums of the phase contributions or a change in direction that doesn’t match the given timings and speeds. If you share the exact RPMs and times from the figure, I can show the step-by-step arithmetic.

The idea being tested is tracking the total angular displacement by adding up how far the propeller turns in each phase, paying attention to direction. For each phase, convert the time and speed into revolutions (revolutions = RPM × time / 60), and assign a sign: clockwise as positive, counterclockwise as negative. Add all the clockwise contributions and subtract the counterclockwise ones. The net result in this problem turns out to be a clockwise total of 1 and 1/8 revolutions, which is why the correct answer states clockwise 1 1/8 times. The other options would require different sums of the phase contributions or a change in direction that doesn’t match the given timings and speeds. If you share the exact RPMs and times from the figure, I can show the step-by-step arithmetic.