The energy for pushing this piston up can be supplied from _____, so that the piston can keep moving up and down.

A:the same piston B:the piston nearby C:the other pistons D:the generators on board

As to the piston cooling, of the following, which statement is not true?

A:Because the piston is exposed to very high temperature, it must be cooled B:The lower the piston cooling temperature is, the better it is C:Both water and lube oil can be used as coolant D:One of the piston cooling methods is vibration cooling, with better effect

The function of diesel engine piston compression rings is to _____.

A:prevent piston side thrust B:prevent engine friction losses C:transmit heat from the piston to the cylinder liner D:remove oil from the cylinder combustion space

The main purpose of the piston oil scraper rings is to _____.

A:seal the space between the piston and the liner B:reduce the amount of lube oil burned in the combustion chamber C:transmit heat from the piston to the cylinder liner D:damp out fluctuations of the piston side thrust

The main function of piston compression rings is to _______.

A:prevent excessive cylinder liner wear B:reduce friction losses in the engine C:seal the space between the piston and the liner D:limit upward flow of lube oil into the combustion space

Piston cooling fins are located .

A:atop the piston crown B:beneath the piston crown C:at the base of the piston skirt D:inside the cylinder liner cooling water jacket

If the back clearance of a piston ring is excessive, .

A:compression pressure in the cylinder will be higher B:carbon will accumulate behind the ring C:combustion gases will penetrate beneath the ring land D:piston side thrust will be increased

If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by _______________.

A:alternation of side thrust B:a breakdown of the lube oil film on the cylinder wall C:worn piston boss piston pin bearings D:fluctuating gas pressure in the combustion space

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 piston

Diesel engine piston seizure can be caused by ______________.

A:poor cooling of cylinder walls B:improper cooling of the piston C:insufficient piston lubrication D:all of the above