If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.

[单选题]If the engine does start on air, but combustion does not immediately begin, the cause may be _____.A．failure of the fuel pumpsB．starting air pressure too lowC．stop valve in air line closedD．the turning gear still engaged

[单选题]If the engine does not start on air, it may be due toA．low compression of the fuel pumpsB．incorrect timing of fuel pumpsC．the starting air valves stuckD．air-locks in fuel oil pipeline

[单选题]If the engine does not start on air, it may be due to （）A . low compression of the fuel pumpsB . incorrect timing of fuel pumpsC . the starting air valves stuckD . air-locks in fuel oil pipeline

[单选题]In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.A . pressure chargedB . naturally aspiratedC . contaminatedD . high speed diesel

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

[单选题]An indication of a diesel engine air intake being partially clogged, is （）.A . low firing pressure and low exhaust temperaturesB . low firing pressure and normal exhaust temperaturesC . high firing pressure and low exhaust temperaturesD . high firing

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

[单选题]If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.A . compression pressures are below normalB . lube oil is diluted with fuel oilC . cranking speed is too lowD . exhau

[单选题]The engine will fail to start unless （）.A . the pressure of the starting air is high enoughB . there is enough air in the air reservoirsC . the air is supplied into the cylinders in the appropriate sequenceD . all of the above