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Excessive lube oil consumption by a reciprocating air compressor can be caused by ().
A、using a slightly dirty air filter
B、using oil having an excessive viscosity
C、intercooler or after-cooler leaks
D、carrying the oil level higher than normal
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A frontal thunderstorm is caused by().
A . pronounced local heating
B . wind being pushed up a mountain
C . a warm air mass rising over a cold air mass
D . an increased lapse rate caused by advection of warm surface air
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Deviation is caused by().
A . changes in the earth's magnetic field
B . nearby magnetic land masses or mineral deposits
C . magnetic influence inherent to that particular vessel
D . the magnetic lines of force not coinciding with the lines of longitude
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FLOATING,CAUSED BY WINDS AND CURRENT WITH A DETERMINABLE DIRECTION defines().
A . Floating
B . Sailing
C . Drifting
D . Running into danger
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Damage to cargo caused by dust is known as().
A . contamination
B . oxidation
C . tainting
D . vaporizatio
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Permanent magnetism is caused by().
A . operation of electrical equipment and generators on board ship
B . the earth's magnetic field affecting the ship's hard iron during construction
C . the horizontal component of the earth's magnetic field acting on the horizontal soft iron
D . the vertical component of the earth's magnetic field acting on the vertical soft iro
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Deviation in a compass is caused by the().
A . vessel's geographic position
B . vessel's heading
C . earth's magnetic field
D . influence of the magnetic materials of the vessel
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Electrical failures in motors are caused by the breakdown of insulation, which may be caused by ()
A . penetration of moisture
B . accumulation of dirt
C . overheating
D . All of the above
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Crankcase sweating in a refrigeration system is caused by ().
A . a stuck solenoid valve
B . a shortage of refrigerant
C . too much oil in circulation
D . too much superheat
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The set of the ocean current is caused by().
A . density differences of the water
B . rotation of the earth
C . direction of primary circulation of air
D . all of the above
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Variation in a compass is caused by().
A . Worn gears in the compass housing
B . Magnetism from the earth's magnetic field
C . Magnetism within the vessel
D . Lack of oil in the compass bearing
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An occluded front is caused by a(n)().
A . low pressure area
B . high pressure area
C . area of calm air
D . cold front overtaking a warm front
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MIST is caused by().
A . forest fires
B . smoke from industrial areas
C . dust or sand storms
D . water droplets with the relative humidity more than 95%
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Noise in a refrigeration compressor can be caused by ().
A . worn bearings and piston pins
B . slugging due to flooding back
C . too much oil in circulation
D . All of the above
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Air circulation is caused or affected by().
A . the rotation of the earth on its axis
B . convection currents caused by differences in radiant heating between equatorial and polar regions
C . mountain ranges
D . All of the above
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The()accident was caused by your ship.
A . sailing
B . damaged
C . sounded
D . abovementioned
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The emulsion of the oil is mainly caused by ().
A . the solid impurities of large particle
B . the solid impurities of fine particle
C . the water content
D . both water and solid impuritie
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The Earth’s irregular heating is caused by ().
A . the time of day
B . the seasons
C . geography
D . All of the above
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Special extraneous risks mean risks caused by theft, rain, leakage, shortage, breakage, dampness, mildewing (a plant disease caused by fungi), heating, taint of odor, hooking, and rusting.
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Forest fires can be caused by______.
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Lightning is caused by clouds()electricity.
A、discharging
B、discharged
C、to discharge
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The traffic accident might have been caused by().
A.A.rescue teams
B.B.medical literature
C.C.drunken driving
D.D.physical therapy
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Malnutrition may be caused by ________()
A.a poor environment
B.unwise food selections
C.under-nutrition
D.both B and C