Which type of engine timing gear tooth design has the advantage of low thrust loads?
A. spur
B. helical
C. amboid
D. hypoid
Answer: A
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If the condenser split of a unit is supposed to be 30° what is the head pressure of an R404A unit supposed to be if the ambient air at the condenser is 84°?
a. 210 psig b. 240 psig c. 270 psig d. 290 psig
(a) Compute the slope at A and the horizontal displacement of joint B in Figure P8.32. EI is constant for all members. Consider only bending deformations. Given: I = 100 in. 4 ,
Methemoglobinemia is principally a potential threat to:
A) babies drinking water high in nitrate. B) babies drinking water high in sulfate. C) adults drinking water high in nitrate. D) adults drinking water high in sulfate. E) all of the above
Why do gas furnace efficiencies jump from 80 percent to 90 percent?
A) The blower used with 85 percent furnaces cannot be used for air conditioning. B) Federal regulations do not allow the production of mid-efficiency furnaces. C) By installing a recuperative coil ahead of the main heat exchanger. D) The physics of combustion make it impossible to produce an 85 percent efficient furnace.