更多"（） may be the first possible cause "的相关试题:
[单项选择]Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
A. Loading
B. Discharging
C. Crude oil washing
D. Steaming tanks
[单项选择]
Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? （）
(1) too little cooling water
(2) too much cooling water
(3) too warm cooler water
A. （1）only
B. anyof（1），（2）and（3）
C. anyof（1）and（3）
D. anyof（1）and（2）
[单项选择]
Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? （）
(1) faulty condensing
(2) too few refrigerant
(3) high discharge pressure
A. any of (1) and (3)
B. any of (1) and (2)
C. any of (2) and (3)
D. any of (1), (2) and (3)
[单项选择]Which of the following may cause that an engine doesnt turn on starting air?（）
A. too low starting air pressure
B. main starting valve closed
C. neither A nor B
D. A and B
[单项选择]Which person may command a lifeboat in ocean service?（）
A. Licensed deck officer
B. Able seaman
C. Certificated person
D. All of the above
[单项选择]Which vessel may show three lights in a vertical line，the top and bottom being red and the middle being white? （）
A. A vessel engaged in diving operations
B. A pilot vessel
C. A vessel trawling
D. All of the above
[单项选择]Which system may be useful for messages，such as local storm warnings or a shore-to-ship distress alert，for which it is inappropriate to alert all ships in the satellite coverage area?（）
A. NAVTEX
B. EGC
C. AMVER
D. DSC
[单项选择]Which item may be substituted for，in the fireman’s outfit，on a cargo vessel?（）
A. fire ax
B. flashlight
C. rigid helmet
D. flame safety lamp
[单项选择]Which may ignite fuel vapors?（）
A. Static electricity
B. An open and running motor
C. Loose wiring
D. All of the above
[单项选择]If a hydraulic pump is overheating, the cause may be （）.
A. excessive internal leakage in the pump
B. low discharge pressure and fluid flow
C. excessive fluid level in the hydraulic reservoir
D. operation of the pump at 100% efficiency
[单项选择]The three conditions which cause engine shutdown are overspeed，low lube oil pressure，and（）.
A. High lube oil pressure
B. High jacket water pressure
C. High jacket water temperature
D. Low jacket water pressure
[单项选择]The total magnetic effects which cause deviation of a vessel’s compass can be broken down into a series of components which are referred to as（）.
A. divisional parts
B. coefficients
C. fractional parts
D. equations
[单项选择]Defense plans may cause the operation of electronic aids to navigation to be suspended with （）.
A. no notice
B. one day's notice
C. a week's notice
D. thirty (30) days notice
[单项选择]Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）
A. faulty combustion
B. excessive ring temperature
C. over lubrication
D. all of the above
[单项选择]Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）
A. Clogged air intake falters
B. Piston blow-by
C. A defective after-cooler
D. Faulty exhaust valves
[单项选择]Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）
A. Excessive piston blow-by to the manifold
B. Insufficient cooling water flow
C. Accumulated water in the air boxes
D. Clogged air intake filters
[单项选择]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
[单项选择]Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）
A. Defective temperature controls in the system
B. Cavitation in the cooling water pump
C. Opened vent in the cooling system
D. Restricted water passages in the engine
