大管轮轮机英语综合
103． If air at 95 ℃ dry bulb temperature and 50% relative humidity is conditioned to 75 ℃ dry
bulb temperature and 50% relative humidity, it is an example of ______. A. cooling only B. cooling and humidifying C. cooling and dehumidifying D. adiabatic cooling
104． The function of damper windings in a synchronous motor is to ______.
A. eliminate slippage B. provide excitation C. provide starting torque D. increase efficiency 105． Moisture in a D.C. motor would cause______.
A. short circuit B. speed up C. slow down D. hunting
106． With reference to rules governing steering gear, which one of the following rules is
incorrect ?
A． It is required that all ships are provided with two independent steering gear systems that is one main and one auxiliary．
B． The auxiliary gear could be power operated in passenger ships．
C． The auxiliary gear must be of adequate strength and sufficient to steer a ship at navigable speed．
D． All moving parts of the steering gear must be guarded against any possible damage．
107． Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an______.
A. overspeed trip B. audible/visual alarm C. the ships/boats general alarm D. reserve oil storage tank 108． An ohmmeter can be used to measure______.
A. current flow in a circuit B. voltage between two points in a circuit C. circuit continuity D. power
109． Temperature control valves installed in the jacket cooling water system of a diesel engine,
modulates the rate of water flow through the______.
A. cooling water pump B. nozzle cooling passages C. cylinder jackets D. heat exchanger
110． When the bearing becomes dry from lack of oil, the motor shaft may heat to _____ an extent
_____it welds itself to the bearing.
A. either/or B. neither/nor C. such/that D. so/that
111． The system will include various______ such as low tank level alarms and remote operation
of tank outlet valves in the events of a fire.
A. switches B. panels C. alarm units D. safety devices
112． The indications of a scavenge fire are excessive black smoke, ______ and peeling from
scavenge trunking.
A. turbo-chargers surge B. spark seen from the drains C. paint blistering D. all above are right
113． An automated diesel engine should normally shut down due to ______.
A. low lube oil temperature B. high ambient air temperature
C. low lube oil pressure D. high exhaust system back pressure
114． A moving object will not accelerate or decelerate _____ a force is applied to it.
A. whether B. if C. unless D. till
115． A diesel engine is operating with excessively high exhaust temperatures at all cylinders. To
correct this condition, you should FIRST______.
A. reduce the engine load B. increase the cooling water flow C. increase the lube oil pressure D. adjust the fuel rack
116． A main propulsion diesel engine is normally shut down by ______.
A. shutting off the air supply B. over-speeding the engine C. securing the fuel supply D. securing the ignition system
117． Diesel engine automated control systems may utilize sensing devices of dual function, with
sensing ranges providing both alarm and engine shut down capability. Which of the key points listed would only require an alarm sensor? A. Lube oil pressure and temperature. B. Jacket water pressure and temperature. C. Engine over-speed. D. Lube oil sump level.
118． Fix the fuel injector into______ after repair.
A. the cylinder liner B. the cylinder cover C. the cylinder jacket D. the piston
119． Lower suction pressure of a pump may be caused by______.
A. too much air in the pipe line B. clogged strainer C. empty tank D. leaky pipe
120． There is a danger of the starting current _____ that the windings are burnt out.
A. to increase B. to be so increased C. increased D. being so increased 121． The crankshaft deflection is at first to be______ before and after repair .
A. disassembled B. renewed C. measured D. regulated 122． _____, we continued lifting out the pistons.
A. Late as it was B. As it was late C. Since it was late D. Because of its late 123． Combustion knock occurring in a diesel engine can be caused by ______.
A. excessive fuel penetration B. prolonged injection lag C. reduced ignition lag D. prolonged ignition lag 124． Rounds _____. Everything is in good order.
A. operated B. made C. run D. done
125． If you ___ the equipment more carefully before sail, we ____ so much trouble now.
A. examined, are not having B. had examined, would not have C. had examined, would not have had D. should examine, would not have 126． Combustion knock can occur in the cylinders of a diesel engine under any condition
permitting______.
A. a shortened ignition delay period B. a lean fuel/air mixture
C. excess fuel in the combustion chamber D. rapid vaporization of injected fuel droplets
127． ______that everything in the engine crankcase is correct, start up the crankcase lubricating
oil pump.
A. To satisfy B. To be satisfied
C. After satisfying D. After being satisfied
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