When is it acceptable to use a roof ladder as a free-hanging ladder?
a. never
b. if the ladder will support the weight of only one person
c. if the ladder was manufactured after 1993
d. if the total supported weighted will not exceed 500 lb
Answer: a. never
Trades & Technology
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Excessive toe-out on the right-rear wheel causes all of these problems EXCEPT:?
A. ?Feathered tire tread wear B. ?Steering pull to the left C. ?Incorrect thrust angle D. ?Incorrect right-rear camber angle
Trades & Technology
Which of the following is true of drain wires in fire alarm and instrumentation cable?
a. They should be twisted. b. They should be No. 24 AWG or smaller. c. Only one end is typically grounded. d. They should be taped back on both ends.
Trades & Technology
Noise can be eliminated at its source by enclosing the source.