A portable brake is used _____.
a. as part of a fall protection system
b. for trimming slate and tile
c. to bend flashing materials
d. for controlling a material-handling hoist
Answer: C
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Answer the following statement(s) true (T) or false (F)
1. Packaged variable speed drives generally operate on AC. 2. The AC service in industrial plants can not be converted to direct current for use with DC variable-speed controls. 3. The field of the DC generator can be reversed manually or automatically with a resulting reversal of the motor rotation. 4. A controlling tachometer feedback signal may be driven by the DC motor driveshaft. 5. The generator field resistance can be changed manually or automatically by latching relays.
The ball joint nut should not be backed off to install the cotter pin though the castle nut.
Answer the following statement true (T) or false (F)
Which term means using techniques of soil preparation, planting, and cultivation that disturb the soil the least?
a. conservation tillage b. contour farming c. strip cropping d. crop rotation
A land development company is considering the purchase of earth-moving equipment. This equipment will have an estimated first cost of $190,000, a salvage value of $70,000, a life of 10 years, a maintenance cost of $40,000 per year, and an operating cost of $260 per day. Alternatively, the company can rent the necessary equipment for $1100 per day and hire a driver at $180 per day. (a) If the company’s MARR is 10% per year, how many days per year must the company need the equipment in order to justify its purchase? (b) When approached to rent for the breakeven number of days, the equipment owner indicated that the minimum rental is for 100 days per year; however, he might consider a lower daily rental cost. What is the daily rental cost to justify renting over purchasing? If the
equipment was purchased, assume it would be used for the breakeven number of days. Use the Goal Seek or Solver tool to determine the required rental cost per day. What will be an ideal response?