更多"Which of the following is not a rec"的相关试题:
[单项选择]Which of the following is not a factor which can interfere with the pulse of sound and cause a variation the depth reading?()
A. salinity
B. temperature
C. the hydrostatic pressure
D. Vessel’s speed
[单项选择]If you observe any situation which presents a safety or pollution hazard during fuel transfer operations, which of the following actions should be taken FIRST?()
A. Close the valves at the transfer manifold
B. Notify the person in charge of the shore facility
C. Shut down the transfer operation
D. Sound the fire alarm
[单项选择]As to the bearing, of the following, which statement is not true?()
A. ff overheat is found, the engine must be stopped for inspection
B. Much heat of the crankcase door indicates that the bearing is overheated
C. If bearing clearance is too large, knocking will be heard in the crankcase
D. If bearing clearance is too large or too small, the white metal may be melted
[单项选择]As to the piston cooling, of the following, which statement is not true?()
A. Because the piston is exposed to very high temperature, it must be cooled
B. The lower the piston cooling temperature is, the better it is
C. Both water and lube oil can be used as coolant
D. One of the piston cooling methods is vibration cooling, with better effect
[单项选择]Which extinguishing agent is recommended in the Chemical Data Guide for use on a carbon disulfide fire?()
A. Alcohol foam
B. Dry chemical
C. Chemical foam
D. Water fog
[单项选择]Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?()
A. Foam
B. Carbon dioxide
C. Dry chemical
D. Water fog
[单项选择]In determining safe speed,all of the following must be taken into account EXCEPT the().
A. maximum horsepower of your vessel
B. presence of background lights at night
C. draft of your vessel
D. maneuverability of your vessel
[单项选择]Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?()
A. If no answer is received on the designated distress frequencies,repeat the distress call on any frequency available
B. Channel 16 (156.8) may be used for distress messages
C. It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
D. Distress messages should first be transmitted on 2182 kHz
[单项选择]Which of the following statements concerning cargo is correct?()
A. Cargoes are any type of goods transported by any type of ships
B. Cargoes are goods transported in bulk
C. Cargoes usually include goods transported in bulk and in containers
D. Cargoes are usually packaged in containers
[单项选择]Which of the following statements concerning frontal movements is TRUE().
A. The temperature rises after a cold front passes
B. The barometric pressure rises when a warm front passes
C. A cold front generally passes faster than a warm front
D. A warm front usually has more violent weather associated with it than a cold front
[单项选择]Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?()
A. Impeller
B. Electric motor
C. Volute
D. Eye
[单项选择]Which of the following descriptions best identifies the operating principal of a flash-type evaporator?()
A. Sea water is heated to boiling temperature while under a vacuum
B. Sea water is passed over heated plates in a thin film
C. Heated sea water is injected into a vacuum chamber
D. Sea water is forced through a heated eductor
[单项选择]Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?()
A. Higher compression ratios create higher temperature
B. Higher temperatures create higher compression ratios
C. low temperatures create higher compression ratios
D. Higher compression ratios create low temperatures
[单项选择]Which of the following machinery space operations is required to be logged in the Oil Record Book?()
A. Ballasting or cleaning of fuel oil tanks
B. Shifting suction of main fuel pump to reserve fuel oil tank
C. Changing out sprayer plates to adjust for steam demand
D. Daily inspection of engine room bilges
[单项选择]Which of the following operating procedures should be carried out immediately after any diesel engine is started?()
A. Take all exhaust temperature reading
B. Check the sump oil level
C. Verify proper lube oil pressure
D. All of the above
[单项选择]Which of the following nondestructive testing methods can be used to detect a suspected subsurface defect in a tail-shaft liner?()
A. Dye penetrant
B. Magnetic particle
C. Ultrasonic
D. All of the above
[单项选择]Which of the following statements concerning butterfly valves is correct?()
A. Special tools are required for lapping or grinding
B. It is impossible to throttle flow with a butterfly valve
C. To close the valve, it is only necessary to turn the handle a quarter of a turn
D. The butterfly valve should never be used in a freshwater system
[单项选择]Which of the following represents the significance the fuel oil cetane number?()
A. The cetane number has no affect on injection lag
B. The cetane number is an indication of the fuel’s viscosity
C. Ignition lag is reduced with fuels having a high cetane number
D. The cetane number is of little significance in the combustion