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单选题
What is an advantage of a steam turbine over a diesel for the main propulsion?（）
A
Faster response from ahead to astern
B
Less fuel consumption
C
Cheaper initial installation cost
D
Less weight per unit of horsepower
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Which method should be used to warm up the pump turbines prior to discharge ________．A.Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB.Run the pump at high speed with the discharge valves closedC.Run the turbine at slow speed with the pump disconnectedD.Shut the discharge valve and run the pump at slow speed
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A dry-steam reservoir produces steam with _____.A.the energy to turn a turbine
B.impermeable rock
C.one or two separators
D.turbine operator
E.little or no water
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单选题What is the best way of stopping an over-speeding diesel engine?（）A
Disconnect the battery cables from the starting motorB
Drain the hydraulic fluid from the governor sumpC
Block the flow of cooling air to the radiatorD
Secure the fuel supply and block the air intake
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单选题What is NOT an advantage of the rhumb line track over a great circle track? （）A
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单选题Which method should be used to warm up the pump turbines prior to discharge（）.A
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Run the pump at high speed with the discharge valves closedC
Run the turbine at slow speed with the pump disconnectedD
Shut the discharge valve and run the pump at slow speed
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单选题Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.A
They are less expensiveB
They are smaller for equivalent pumping abilityC
They pump more cargo in less timeD
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单选题What is an advantage of diesel over steam turbine propulsion? （）A
Less fuel consumption per SHPB
Diesel fuel costs less than bunker C or its equivalentC
Less routine maintenance requiredD
Less weight per SHP
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单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
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a modem diesel engine；exhaust gasesC
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单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
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Its seats are more comfortable.D
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单选题What is/are the advantage（s）of cranes over conventional cargo booms（）.A
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Simplicity of operation of the crane by its operatorD
All of the above
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