In all furnace cabinet configurations, the return air:
A) Enters as combustion air, travels through the heat exchanger, and exits the fan end of the furnace.
B) Enters at the heat exchanger end and exits the fan housing end of the furnace.
C) And combustion air enter the furnace through the same opening.
D) Enters at the fan housing end and exits the heat exchanger end of the furnace.
D
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The Eurostar provides international high speed train service between Paris, London, and Brussels through the English Channel Tunnel. Eurostar trainsets can operate at maximum speeds of 3.00 × 10² km/h. Assume that the resistance between the train and the track is 115 × 10³ newtons. If air resistance adds an additional 25.5 × 10³ newtons, determine the horsepower needed to power the engine at maximum speed. [Note: Power = (force) × (velocity)]
What will be an ideal response?
The contour lines that represent the elevation of the land when construction is complete are commonly referred to as the
a. grade line. b. site line . c. tree line. d. land line.
Which of the following are major causes of electrical shock?
A. Contact with bare wire carrying current. B. Electrical equipment that has not been properly grounded. C. Static electricity discharge. D. All of the above
Despite an abundance of fish and game, early Jamestown settlers continued to starve because
A. they had neither weapons nor fishing gear. B. their fear of Indians prevented them from venturing too far from the town. C. they were unaccustomed to fending for themselves and wasted time looking for gold. D. they lacked leaders to organize efficient hunting and fishing parties. E. there were not enough gentlemen to organize the work force.