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【单选题】
如果连续的增加某种生产要素,在总产量达到最大时,边际产量曲线A.
与纵轴相交
B.
过原点
C.
与平均产量线相交
D.
与横轴相交
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【单选题】Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?
A.
Plugged injector nozzles
B.
Excessive fuel injection
C.
Very late injection timing
D.
Incorrect crankshaft clearance
【单选题】Most hydraulic steering gears are fitted with relief valves which .
A.
function when the rudder is amidships
B.
relieve excess whip pressure from the hydraulic oil system
C.
protect the piping assembly from external rudder shock
D.
relieve excessive telemotor pressure
【单选题】The purpose of the safety relief valves installed on an auxiliary boiler is to _____.
A.
relieve excess fuel oil pressure during the “off” fire cycle
B.
admit water to the dry pipe
C.
throttle the forced draft fan output for proper combustion
D.
reduce excess steam pressure in the boiler
【单选题】Cargo pump relief valves are piped to the ______．
A.
cargo pump pressure gauges
B.
crossover lines interconnecting two pumps
C.
suction side of pumps
D.
atmosphere through pump vents
【单选题】Blow-off of the relief valves of the engines cylinders may be caused by _____.
A.
too low lead
B.
water in fuel
C.
too tight spring
D.
leakage
【单选题】What is the purpose of pressure-vacuum relief valves ________．
A.
Regulation of discharge pressure from cargo pumps
B.
Maintaining constant velocity in cargo lines
C.
Regulation of suction head on cargo pumps
D.
To maintain a tank or void at atmospheric pressure
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