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Mathematics
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Practical Problems in Mathematics for Electricians
Quiz 1: Whole Numbers
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Question 1
Short Answer
The cost of magnet wire for a motor repair shop during a one-week period is as follows: 14 pounds of number 17, $58; 12 pounds of number 16, $55; 10 pounds of number 24, $51; 6 pounds of number 21, $19; and 5 pounds of number 25, $24. Find the total cost of magnet wire during this period.
Question 2
Short Answer
At inventory time, 435 pounds of magnet wire for winding motors is available. In ten successive days, 15 pounds, 6 pounds, 24 pounds, 12 pounds, 3 pounds, 8 pounds, 17 pounds, 32 pounds, 16 pounds, and 13 pounds of wire are taken out of stock. How many pounds are left?
Question 3
Short Answer
Eight different boxes contain a number of 3/4 inch, # 8 flat-head, bright wood screws. The numbers of screws are 124, 72, 36, 92, 38, 64, 74, and 67. What is the total number of screws?
Question 4
Short Answer
At different times during the week, an electrician takes the following amounts of metallic cable from stock: 500 feet, 1,200 feet, 250 feet, 90 feet, 38 feet, 65 feet, 84 feet, 225 feet, and 125 feet. What is the total number of feet of metallic cable taken from stock?
Question 5
Multiple Choice
The key on the calculator used to change the sign of a number is called:
Question 6
Short Answer
A factory department has motors of 75 horsepower, 30 horsepower, 200 horsepower, 40 horsepower, 25 horsepower, 15 horsepower, 5 horsepower, 125 horsepower, 150 horsepower, and 175 horsepower. What is the combined horsepower of the 10 motors?