Automobile Set 3

The piston skirt clearance at room temperature is about

• .004mm

• .04mm

• .4mm

• 1mm

piston pins on some engines are offset to the

• right side

• left side

• major thrust side

• minor thrust side

the purpose of piston rings is to control

• combustion pressures

• cylinder wall lubrication

• oil consumption

• all of the above

In autothermic pistons steel inserts are used to

• reduce piston expansion

• control the direction of expansion

• reduce piston weight

• make the piston stronger

the minimum number of compression rings in an automotive engine is

• 1

• 2

• 3

• 4

compression rings are generally made of

• low carbon steel

• high carbon steel

• aluminium

• chromium

The uppermost ring on a piston is usually plated with

• steel

• cast iron

• aluminium

• chromium

on the compression stroke the rings are pressed against

• top of groove

• bottom of groove

• inner side of groove

• all of these

the primary purpose of a ring expander is to

• make up for cylinder wear

• increase static ring tension

• decrease dynamic ring tension

• reduce ring vibraions

connecting rod connect the crankshaft and the

• cylinder head

• cylinder block

• piston

• camshaft