The law of conservation of matter states that:
A) Only "green" matter should be used for installing HVACR systems.
B) Matter cannot be created or destroyed.
C) Matter should not be wasted.
D) An equal amount of matter is always created somewhere whenever matter is destroyed.
B
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The fundamental tasks of a motor controller are to start and stop the motor and to protect the motor, machine, product, and ____.
a. instruments b. pipes c. plant d. operator
Which of the following is the symbol for a trayed tower?
Figure
Which of the following is an incorrect statement about the use of turnbuckles?
a. Turnbuckles are used to adjust the length of rigging connections. b. The working load limit of a hook-end turnbuckle is greater than comparably sized eye and eye turnbuckles. c. Turnbuckles should be tightened with a wrench of the proper size. d. When using multi-legged slings, only one turnbuckle should be used per leg.
The type of form system that can be as wide as 50 feet are _____.
a. slip forms b. job-built wall forms c. gang forms d. insulating concrete forms