Starting air valves are held firmly on their seats by（）
A . cam rollers on the camshaft
B . spring force
C . air pressure on top of the valve differential piston
D . air pressure on the bottom of the valve differential pisto
相似题目
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When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.
A . just
B . nearly
C . merely
D . already
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Open the （）before starting an air compressor.
A . unload valve
B . cooling water
C . oil cup
D . sum
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In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）
A . noise coming from that air starting valve
B . continuous operation of the starting air compressor
C . zero air pressure in the air starting system
D . overheated starting air pipe to the cylinder head
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Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）
A . Holding the valve open for a long period
B . Increasing the starting air pressure used
C . Opening the stating air valve quickly
D . Reducing the starting air valve size
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Intercoolers installed on starting air compressors, reduce the possibility of（）
A . dust entering the high pressure stage
B . lube oil carbonization
C . discharge pulsations
D . inter-stage vapor lock
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When starting a reciprocating pump, the inlet valve should be （）.
A . closed
B . opened fully
C . cracked open
D . partly ope
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The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.
A . because
B . though
C . since
D . until
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Each cylinder has one starting valve which is usually opened by air pressure and closed by （）
A . nuts and bolts
B . new joints
C . spring force
D . sealing ring
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When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.
A . stand-by engine
B . full ahead
C . finished with engine
D . full away
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During （）, the starting air valves should be closed to prevent the engine from turning.
A . overhaul
B . running
C . blowing down
D . All of the above are correct
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The pressure of pilot air is usually （） than that of starting air.
A . higher
B . lower
C . low
D . high
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When starting a centrifugal pump, the discharge valve should be （）.
A . closed
B . opened fully
C . cracked open
D . partly ope
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Before starting an air compressor, It should be （）.
A . unloaded
B . primed
C . filled with water
D . greased
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（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.
A . Because
B . Owing to
C . For
D . No matter
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Before starting an engine by air, the engine must（）
A . be turned by a turning gear for at least one minute
B . be turned by a turning gear for at least two minutes
C . be turned at least one complete turn
D . be turned at least two complete tur
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（） supplies pilot air to control the cylinder air start valves.
A . An air compressor
B . An indicator cock
C . An air distributor
D . A safety valve
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The starting air system usually has （） to prevent starting if anything is not in order.
A . stop valves
B . interlocks
C . non-return valves
D . air vent
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The timing of diesel engine air starting valves is controlled by（）
A . the air start valve timing gears and rods
B . a cylinder check valve
C . individual cams and valve gear
D . an air manifold poppet valve
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Before starting the engine the air bottle should be （）.
A . pumped up
B . loaded
C . discharged
D . opened
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Diesel engine air start system check valves are opened by （）
A . an air start cam
B . cylinder compression pressure
C . starting air pressure
D . valve spring
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During the inspection, the starting air valves should be closed （） the engine from turning.
A . to increase
B . to speed up
C . to prevent
D . to reduce
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In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.
A . cooling water
B . vapor from the boiler
C . starting air
D . hot gase
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Air receivers installed in starting air systems are to be （）.
A . cylindrical in shape with service connections located at the top and bottom
B . opened and made available for inspection during biannual inspections provided
C . with automatic drain traps for the removal of moisture
D . so installed as to make the drain connections effective under extreme conditions of trim
