A.that the fuel valve is open
B.if the air supply system is open
C.if the water sprinkler system is open
D.if the limit switch is on
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A.a defective ignition system
B.low lube oil level
C.weak valve springs
D.too heavy a load
A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke
A.They are less expensive
B.They are smaller for equivalent pumping ability
C.They pump more cargo in less time
D.All of the above
A.cargo pump pressure gauges
B.crossover lines interconnecting two pumps
C.suction side of pumps
D.atmosphere through pump vents
A.advance
B.cavitation
C.edging
D.slip
最新試題
In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.
The bypass valve on a self-contained breathing device should be opened if（）.
In ship construction，keel scantlings should be the greatest（）.
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
Limit switches are used on which davits?（）
In ship construction，frame spacing is（）.
The most common type of davit found on merchant vessels today is the（）.
As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.
The holding capability of an anchor is primarily determined by the（）.
As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.