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.

[单选题]During the inspection, the starting air valves should be closed （） the engine from turning.A . to increaseB . to speed upC . to preventD . to reduce

[单选题]Each cylinder has one starting valve which is usually opened by air pressure and closed by （）A . nuts and boltsB . new jointsC . spring forceD . sealing ring

[单选题]B．efore starting the engine, the air bottle should be ____.A．pumped upB．loadedC．dischargedD．closed

[单选题]Before starting the engine the air bottle should be （）.A . pumped upB . loadedC . dischargedD . opened

[单选题]During （）, the starting air valves should be closed to prevent the engine from turning.A . overhaulB . runningC . blowing downD . All of the above are correct

[单选题]The total starting air capacity required for reversible main engines is to be sufficient for at least （）.A . six consecutive startsB . eight consecutive startsC . ten consecutive startsD . twelve consecutive start

[单选题]In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.A . downwards；upwardsB

[单选题]The starting air system usually has （） to prevent starting if anything is not in order.A . stop valvesB . interlocksC . non-return valvesD . air vent

[单选题]The period of valve overlap is when （）.A . the inlet valve is openB . the exhaust valve is openC . both valves are closeD . both valves are ope

[单选题]The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.A . tape faceB . tapered faceC . surfaceD . thinner face