Millwright - Power Transmission Exam Questions With Correct Answers

Millwright - Power Transmission Exam Questions With Correct Answers 1. Calculate the accurate belt length for the following: Large diameter pulley is 11.25" and the small diameter pulley is 6.125". Shaft centers are 17.5" apart. a. 62.65" b. 62.00" c. 73.98" d. 62.28" - ANSWER- a. 62.65" L=2C+1.57(D1+d2)+[(D1-d2)²/4C] L=2(17.5)+1.57(11.25+6.125)+[(11.25-6.125)²/4(17.5)] L=35+27.27875+(26.265625/70) L=62.65 2. The clearance of meshing gears of any diametral pitch is known as: a. Back lash b. Tolerance c. Dedendum d. Addendum - ANSWER- a. Back lash 3. A Babbitt bearing percentage refers to its area of contact. This is found by: a. Feeler gauges b. Plastic gauge c. Bluing d. Lead wire - ANSWER- c. Bluing 4. A bearing with a "K" it denotes a tapered bearing. This is held in place by: a. Shaft collar b. A tapered adapter sleeve c. Lock nut d. Thread locker - ANSWER- b. A tapered adapter sleeve 5. An 8" pulley turns at 120 RPM and drives a second pulley at 150 RPM. What is the driven pulley diameter? a. 4.6" b. 6.4" c. 8.3" d. 3.8" - ANSWER- b. 6.4" 120RPM/150RPM = 0.8 ratio 0.8 x 8" = 6.4" 6. The letters A, B, C on a sprocket refers to: a. Tooth size b. Pitch c. Hub Class d. Type of chain - ANSWER- c. Hub Class 7. Crowning on a pulley is used for: a. Decreased wear b. Tension c. Self alignment d. To allow for different classes of belts - ANSWER- c. Self alignment 8. The standard taper on an imperial key is: a. 1:100 b. 1:96 c. 1:4 d. 1:25 - ANSWER- b. 1:96 9. A type of bearing mounted face to face and back-to-back is: a. Angular contact b. Conrad c. Ball d. Pillow Block - ANSWER- a. Angular contact