IST Applied Mathematics 5

Question 1

A machine produces 250 parts per hour with a 3% scrap rate. How many good parts are made in an 8-hour shift?

Accepted Answer

1,940

Answer

250 x 8 = 2,000 parts, and 97% of 2,000 is 1,940 good parts.

Question 2

A 20-tooth driver gear turning at 900 RPM meshes with a 60-tooth driven gear. What is the speed of the driven gear?

Accepted Answer

300 RPM

Answer

Driven RPM = 900 x 20 / 60 = 300 RPM.

Question 3

An oven is set to 350°F. About what is this temperature in degrees Celsius?

Accepted Answer

177°C

Answer

°C = (350 − 32) x 5/9 ≈ 176.7, or about 177°C.

Question 4

A turned part tapers from 2.000 in. to 1.500 in. in diameter over a length of 4 inches. What is the taper per inch?

Accepted Answer

0.125 in.

Answer

The diameter changes by 0.500 in. over 4 in., so 0.500 / 4 = 0.125 in. per inch.

Question 5

A motor runs on 240 volts and draws 20 amps. How much power does it use?

Accepted Answer

4,800 watts

Answer

Power P = V x I = 240 x 20 = 4,800 watts.

IST - Industrial Skills Test Practice Test