Four-stroke engines use mechanical valves called ____ to control the gases coming into and going out of the engine.
a. puppet valves
b. poppet valves
c. pass valves
d. pull valves
b. poppet valves
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In the diagram, determine ?1 in degrees.
Fill in the blank(s) with the appropriate word(s).
A midcareer engineer hopes to have $2 million available for his use when he retires 20 years from now. He plans to deposit a uniform amount semiannually, beginning now and every 6 months thereafter through the end of year 20. If his investment account has a yearly return of 8% per year, compounded quarterly, the interest rate, i, that must be used in the A?F equation to determine the size of the uniform deposits is:
(a) 2% (b) 8.24% (c) 8.00% (d) 4.04%
How does air flow in a standing-pilot, natural-draft system?
A) It relies on heat to pull air into the combustion chamber and a fan to remove flue gases. B) It relies on heat to decrease the convection of the air to pull air into the combustion chamber and force flue gases into the proper vent. C) It relies on a fan to pull the air into the combustion chamber and blow flue gases out. D) It relies on heat to increase the buoyancy of the air to pull air into the combustion chamber and force flue gases into the proper vent.
Sheep breeds have been developed for three major purposes: wool, meat, and _____.
Fill in the blank(s) with the appropriate word(s).