大管轮轮机英语综合(33-48期)(4)

A. condenser B. blower C. soot blower D. air receiver

80．The thrust block or thrust bearing, located at the ______ of the engine, may be integral with, or

separated from, the bed-plate.

A. fore end B. aft end C. ahead D. astern end

81．The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with

scavenge ports in the sides of the cylinder being ______. A. shut B. closing C. opened D. closed

82．The pressure of pilot air is usually______ than that of starting air.

A. higher B. lower C. low D. high

83．When a centrifuge is arranged to separate impurities and small amount of water from oil, it is

known as a _______.

A. purifier B. separator C. filter D. clarifier

84．The control system for a controllable pitch propeller can be programmed______.

I. to produce a maximum combined propeller and engine efficiency between itch and a given engine speed

II. for continuous operation of the engine at pre-set condition A. I only is correct B. II only is correct

C. both I and II are correct D. neither I or II are correct

85．The amount of fluid delivered by a helical pump can be regulated by ______.

A. throttling the pressure line B. changing the speed of the rotor C. either A or B

D. None of the above is true.

86．One of the consequences in continuing to operate a centrifugal bilge pump with the discharge

valve closed, is that the______.

A. motor overload will open B. relief valve will open C. pump will overheat D. motor will overheat

87．When steam is being raised on a boiler, the water level will normally ______.

A. drop as the boiler warms up B. rise as the boiler warms up

C. remain unchanged until the boiler is hot enough D. rise and fall with the steam demand

88．Which of the following conditions could cause the feed pump for an auxiliary boiler to lose

suction?

A. Increased suction head pressure. B. Decreased feedwater temperature.

C. Pump recirculating line being open too much. D. Excessive feedwater temperature.

89．The______ of the gravity disc is too big. It cause oil to flow through the water outlet. We

changed the disc and no oil is found in the water outlet.

A. gravity B. diameter C. circumference D. cylinder

90．The diameter of the gravity disc is too big. It causes oil to flow through the water outlet. We

changed the disc and no ___ is found in the water outlet. A. water B. oil C. scale D. ridge

91．The fine filters will be arranged _______one can be cleaned while the other is operating.

A. in order to B. because of C. so that D. so as to

92．The term 'discharge', as it applies to the pollution regulations, means_______.

A. spilling B. leaking C. dumping D. All of the above 93．A class C' fire would most likely occur in the______.

A. engine room bilges B. main switchboard C. paint locker D. rag bin

94．Which of the following statements describes the functions of a reservoir used in a hydraulic

system?

A. Dissipate heat B. Trap foreign matter C. Separate air from the oil D. All of the above 95．______are used for cargo handling.

A. Cranes B. Mooring winches C. Windlasses D. Foreman

96．In the cargo winch, spur reduction gearing transfers the motor drive to______.

A. the toping light B. the board brake C. the fail-safe D. the barrel shaft

97．The main steering gear must be able to steer the ship at maximum ahead service speed and be

capable at this speed, and at the ship s deepest service draught, of putting the rudder from 35 degrees on one side to 30 degrees on the other side within no _____. A. more than 28 seconds B. more than 60 seconds C. less than 28 seconds D. less than 60 seconds

98．Freon 12 which is used to produce intense cold is normally a______ when at atmospheric

pressure and temperature.

A. liquid B. gas C. solid D. water only 99．Which of the statements listed concerning heat transfer is correct?

A. Heat is always transferred at a constant rate.

B. Heat transfer rate increases as temperature difference increases. C. The rate of heat transfer is not affected by temperature difference. D. The high temperature region is known as a heat sink. 100． The cooler as the liquid becomes, ______.

A. the faster it will evaporate B. the slower it will condense C. the slower it will evaporate D. the faster it will flow

101． In a refrigeration system, if the cooling water to the condenser fails, the______.

A. box temperature solenoid valve will close B. expansion valve will close C. compressor will shutdown D. king valve will open

102． A feeler or thermal bulb is used for the expansion valve to______.

A. detect the temperature B. detect the pressure

C. heat the refrigerant D. accelerate the refrigerant

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. incre …… 此处隐藏：4802字，全部文档内容请下载后查看。喜欢就下载吧 ……