更多"Which of the following may cause th"的相关试题:
[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 of the following may lead to the engine NOT to start on air?（）
A. starting air pressure too high
B. correct timing of starting air valves
C. three of the six starting valves stuck
D. the turning gear disengaged
[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]The following engine parts are found damaged and we are about to （） compensation from the shipyard.
A. claim to
B. claiming to
C. claim for
D. claiming for
[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]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]Which cause of following will not lead to refrigeration plant short-cycle?（）
A. lack of refrigerant
B. refrigerant with much water
C. set defectively low pressure relay
D. no cooling water
[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]Which cause of the following can lead to the engine not to start on air?（）
A. starting air pressure too high
B. correct timing of starting air valves
C. three of the starting valves stuck
D. the turning gear disengaged
[单项选择]（） may be the first possible cause which makes the engine to lose power or slow down when it is running.
A. Hot bearing
B. Starting valves
C. Unequal distribution of load
D. Excessive crankshaft clearance
[单项选择]If a DC motor runs hot, the cause may be （）
A. high mica condition
B. low ambient temperature
C. clogged ventilation ducts
D. an open in the shunt field
[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 will cause the high pressure cutout to stop the compressor in a R-22 system?（）
A. Condenser leakage
B. A shortage of liquid refrigerant
C. Excessive frost on the evaporator
D. Not enough condenser cooling water
[单项选择]Which will cause a wire rope to fail（）.
A. Using a medium graphite grease as a lubricant
B. Operating a winch too slow
C. Using a sheave with an undersized throat
D. A sheave diameter of 24 times the wire's diameter
