Aviation HS Pt.6

What is the speed ratio of an input gear with 36 teeth meshed to a gear with 20 teeth?

• 9:5

• 1:0.56

• 1:1.8

A pinion gear with 14 teeth is driving a spur gear with 42 teeth at 140 RPM. Determine the speed of the pinion gear

• 588 RPM

• 420 RPM

• 126 RPM

The parts department's profit is 12 percent on a new part. How much does the part cost if the selling price is $145.60

• 128.13

• 125.60

• 130.00

If an engine is turning 1,965 rpm at 65 percent power, what is its maximum rpm?

• 2,653

• 3,023

• 3,242

An engine of 98 horsepower maximum is running at 75 percent power. What is the horsepower being developed?

• 87.00

• 33.30

• 73.50

A blueprint shows a hole of 0.17187 to be drilled. Which fraction size drill bit is most nearly equal?

• 11/64

• 9/32

• 11/32

Which decimal is most nearly equal to a bend radius of 31/64

• 0.2065

• 0.4844

• 0.3164

Sixty-five engines are what percent of 80 engines

• 81 percent

• 65 percent

• 52 percent

The radius of a piece of round stock is 7/32. Select the decimal which is most nearly equal to the diameter

• 0.2187

• 0.4375

• 0.3531

Maximum life for a certain part is 1100 hours. Recently 15 of these parts were removed from different aircraft with an average life of 835.3 hours. What percent of the maximum part life has been achieved?

• 75.9 percent

• 76.9

• 75.0