A-frames and cylinder block is held together by （） to form a rigid structure.

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• The cylinder liner forming the cylinder wall and the inside of the water jacket is called a（）

  A . dry liner B . wet liner C . jacket liner D . corrugated liner

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• When the air charge contacts with the cylinders and pistons and mixes with the residual gases, it will（）

  A . increase in temperature B . lose its energy partly C . expand and do work D . begin to be compressed

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• 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；upwards B . upwards；downwards C . downwards；downwards D . upwards；upward

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• Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）

  A . twice as large as with a cast iron piston B . the same size as with a cast iron piston C . half as large as with a cast iron piston D . the same size as the crown of an aluminum pisto

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• Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.

  A . cylinder covers B . lubricating space C . crosshead D . exhaust manifold

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• An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with（）

  A . graphite packing B . sealing compound C . lubricating oil D . gasket

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• The cylinder head, cylinder liner and （） form the combustion chamber.

  A . frame B . piston C . crankcase D . explosion plate

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• Cracks in cylinder and cylinder covers may （） from unequal heating.

  A . make B . cause C . result D . produce

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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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• In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.

  A . additives B . water C . grease D . acid solutio

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• The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.

  A . screwing into B . being screw on C . to screw on D . screwed into

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• The space between cylinder liner and jacket is called （）.

  A . the cooling water B . the circulating water C . the cooler D . the cooling water space

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• How are the pressure and temperature affected in a diesel engine cylinder during compression?（）

  A . Pressure and temperature decrease B . Pressure and temperature increase C . Pressure decreases and temperature increases D . Pressure increases and temperature decrease

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• The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.

  A . dividing walls B . divided walls C . dividing liners D . divided jacket

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• Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）

  A . Improper fuel rack positioning B . Lengthy opening of the exhaust valve C . Excessively early injection timing D . Extended light load operatio

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• Boilers and cylinders are（）.

  A . raw metallic products B . finished metallic products C . consumable products D . Manufactured goods of large Size

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• Once a scavenge fire is detected, fuel should be shut off from the affected cylinders and cylinder lubrication increased （） the risk of seizure.

  A . to protect B . to guard C . to maximize D . to minimize

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• A-frames are mounted on the bed plate and support （） and cylinder block.

  A . the main bearing B . the cylinder cover C . the entablature D . the sum

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• Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.

  A . the cylinder cover B . the piston rings C . the piston crown D . the piston skirt

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• There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.

  A . recirculating B . total loss C . cooling D . refrigeratio

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• The cylinder covers and the liners are bolted together by means of （）.

  A . bolts welded into the cylinder head B . bolts welded into the cylinder frames C . studs screwed into the cylinder head D . studs screwed into the cylinder frame

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• The （） chamber is enclosed between the cylinder head and piston.

  A . lubrication B . injection C . cooling D . combustio

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• The complete assembly of bedplate, A-frames and cylinder block is held together by （） to form a rigid structure.

  A . tap-bolts B . jack-bolts C . tie rods D . fitted rod

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• A-frames and cylinder block is held together by（）to form a rigid structure

  A．connecting rods B．piston rods C．tie rods D．jack-bolt

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