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Diesel Engine Combustion and fuel questions

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Why is it necessary to compress the air charge in the  cylinders of a diesel engine?/To ignite the fuel.
Turbulence of the compressed air charge in a diesel engine cylinder increases _____________./the efficiency of the engine
A sudden drop in diesel engine cylinder compression pressure can be caused by ____________./malfunctioning valves
Which of the listed reasons is the most likely cause of a sudden drop in compression pressure in one diesel engine cylinder?/Malfunctioning valves
The compression ratio of a diesel engine refers to the ratio between the _______________./cylinder volumes at top dead center and at bottom dead  center
The purpose of compressing the air within the cylinder of a diesel engine is to __________./produce the heat for ignition
If the compression ratio is increased on any diesel engine, _____________./thermal efficiency will increase
Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in ____________./increased horsepower
In an operating diesel engine, the sealing of the cylinder is the result of the compression rings being forced against the cylinder walls by _____________./combustion gas pressure acting behind the ring
A diesel engine valve spring is under compression when the valve is _________.  I. open  II. closed/both I and II
In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to  ______________./ignite the fuel
The compression of air in a positive displacement rotary supercharging blower, occurs only _____________./as air moves into the discharge passage
A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates _____________./properly functioning rings
The face surface appearance of a shallow groove, stainless steel, chrome plated compression ring should exhibit through its operating life a ____________./smooth, shallow groved, chrome surface
A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by _____________./malfunctioning valves
Low compression in a diesel engine could be caused by  ________________./worn or broken piston rings
Low compression pressure in a diesel engine can be caused by _____________./improperly seating intake valves
Low compression pressure in a diesel engine is caused by ___________./improperly seated valves
Low compression pressure in a diesel engine can be caused by ______________./a leaking cylinder head gasket
Low compression pressure in a diesel engine may be the  result of ______________./excessive mechanical clearance between the piston crown and cylinder head
Which of the listed problems can be a cause of low   compression pressure in a diesel engine?/All of the above
A drop in compression pressure in one cylinder of a diesel engine can be caused by _____________./burned valves
Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?/Compression must be low to prevent preignition.
When a diesel engine compression pressure is checked, the indicator is connected to the _____________./cylinder indicator cock
When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by  _____________./excessive cylinder cooling
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