The masonry walls behind the firebrick and on the sides of the firebrick should be _____ thick to protect the firebox from overheating.

A. 5"
B. 6"
C. 7"
D. 8"


Answer: D

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Technician A says that tires and wheels are the most common source of low frequency vibrations. Technician B says that engine or transmission mounts are most common source of low frequency vibrations. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician

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Why must urea be mixed completely in the ration in order for cows to eat it?

What will be an ideal response?

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What is the difference between a selective herbicide and a nonselective herbicide in pest control?

What will be an ideal response?

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An R-22 system has a 28-ft lift and a 7 psi pressure drop in the liquid line due to vertical lift. If the liquid leaves the condenser at 244 psi, what is the pressure at the top of the vertical lift?

A) 214 psi B) 230 psi C) 223 psi D) 237 psi

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