Explain the purpose of the lockout/tagout permit.
What will be an ideal response?
To protect employees from the hazards associated with the accidental release of uncontrolled energy
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Consider a tie rod transmitting a tensile force F. The corresponding tensile stress is given by , where A is the area of the cross section. The deflection of the rod is given by Equation (4–3), which is , where l is the length of the rod. Using the Ashby charts of Figures 2–24 and 2–27, explore what ductile materials are best suited for a light, stiff, and strong tie rod. Hint: Consider stiffness and strength separately.
What will be an ideal response?
Capacitor-start capacitor-run motors that are not hermetically sealed contain a centrifugal switch to disconnect the start capacitor when the motor reaches about ____% of its full load speed.
a. 25 b. 50 c. 75 d. 90
Use economic equivalence to determine the amount of money or value of i that makes the following statements correct.
(a) $5000 today is equivalent to $4275 exactly 1 year ago at i = ___% per year. (b) A car that costs $28,000 today will cost $____ a year from now at i = 4% per year. (c) At i = 4% per year, a car that costs $28,000 now, would have cost $____ one year ago. (d) Last year, Jackson borrowed $20,000 to buy a preowned boat. He repaid the principal of the loan plus $2750 interest after only 1 year. This year, his brother Henri borrowed $15,000 to buy a car and expects to pay it off in only 1 year plus interest of $2295. The rate that each brother paid for his loan is ___ % for Jackson and ___ % per year for Henri. (e) Last year, Sheila turned down a job that paid $75,000 per year. This year, she accepted one that pays $81,000 per year. The salaries are equivalent at i = ____% per year.
Answer the following questions with regard to an alloy of copper with 64 percent of lead that is slowly cooled in a crucible without being stirred from 1100°C to room temperature.
(a) What is the nature of the alloy at 1100°C? (b) Now consider the alloy at a temperature just above the monotectic temperature at 955°C, where it is composed of the two liquids of differenct compositions. Do the liquids have the same density? If not, what would you expect to happen? (c) One of the liquids has the composition of monotectic point. What should happen to this liquid as it passes though the monotectic temperature of 955°C? Describe the physical nature of the contents of the crucible after the alloy is cooled below 955°C, and until it reaches the eutectic temperature at 326°C.