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1. If electrician A uses 27 2/3 feet and 45 3/4 feet from a
spool of cable that had 221 1/2 feet and electrician B uses 37 1/6 feet from
the same spool, how much cable is left on the spool?
2. A motor brush is 1 3/8 inches long. How long is it after
13/16 wears away?

The stair shown in Figure 8-4 has 14 risers. What is the
total rise of the stair if each riser is 7 3/8 inches high?
Figure 8-4

What is the total run of the stair shown in Figure 8-4 if
each tread is 9 5/8 inches wide?
Figure 8-4

The plenum in Figure 8-5 is fastened to a furnace with
equally spaced screws. What is the distance between the centers of the first
and last screws?
Figure 8-5

1. What is the cost of 1,455 feet of cable at $0.16 per
foot?
2. Three laborers work part time for 5 days. Laborer A works
2 1/2 hours every day. Laborer B works 3 3/4 hours every day. Laborer C works 3
1/3 hours every day. They are paid $14.85 per hour. What is the total pay for
these three laborers?

A piece of duct measures 24 inches in length. When 2 pieces are fitted together, 1 1/2 inches are allowed on each end for joining the pieces. If 25 1/2 pieces are joined end-to-end and used on a job, what is the total length of the assembled duct?

Find the width in inches of each opening in the ceiling
register shown in dimension A Figure 8-7.
Figure 8-7

1. An electrical contractor bills a customer $62.00 per hour
for 4 3/4 hours per day for 5 days. He pays his workers 1/3 of what he bills,
and he pays 1/4 of the bill for materials. How much money is left?
2. A wiring job calls for 32 pieces of 1/2-inch conduit 7
1/2 feet long, 8 pieces 1 3/4 feet long, and 3 pieces 7 2/3 feet long. If 1/5
is added for waste, how many feet of conduit are needed?

1. The slight sideward motion of a shaft is called end play.
The end play of a motor shaft should not be more than 1/32 inch. One motor has
an end play of 0.0305 inch. Is this end play more than 1/32?
2. The elevation of a foundation is 19.60 inches. A floor
frame is built on top of the foundation, adding another 13 3/4 inches. What is
the elevation at the top of the floor frame in decimal inches?

1. The inside diameter of a tube is 1 1/4 inches. The wall
of the tube is 0.15625 inch thick. What is the outside diameter in inches and
fractional parts of an inch?
2. A piece of PVC pipe 2 feet 3 inches long is cut from a
10-foot piece. How much pipe is left?