-
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
-
Open the （）before starting an air compressor.
A . unload valve
B . cooling water
C . oil cup
D . sum
-
If the electric motor driving an air compressor fails to start, the cause may be a （）.
A . leaking unloader
B . tripped circuit breaker
C . control line leak
D . defective pop valve
-
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
-
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
-
If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）
A . on the power stroke
B . on the exhaust stroke
C . at the end of the power stroke
D . at the start of the intake stroke
-
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
-
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
-
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
-
When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
A . intake stroke
B . compression stroke
C . power stroke
D . exhaust stroke
-
The pressure of pilot air is usually （） than that of starting air.
A . higher
B . lower
C . low
D . high
-
（） 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
-
Which of the routine maintenance procedure listed is required for starting air receivers?（）
A . Frequent draining of accumulated moisture
B . Frequent testing of relief valves
C . A close watch on temperature to prevent fluctuations in pressure
D . Frequent cleaning to re move oil and foreign matter
-
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
-
（） 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
-
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
-
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
-
Before starting the engine the air bottle should be （）.
A . pumped up
B . loaded
C . discharged
D . opened
-
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
-
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
-
The main purpose of starting the diesel engine on air briefly is（）
A . to inspect if the cylinder has the water leakage
B . to expel out the residual water/gas/oil from the cylinder
C . to check if fuel supply is normal
D . A and B
-
The engine is started with （） supplied from air receivers.
A . pressure oil
B . pressure water
C . compressed air
D . cooling water
-
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
-
The starting air entering the cylinder begins when the piston（）
A . has nearly come to the TDC
B . has just past the TDC
C . has nearly come to the BDC
D . has just past the BDC
