LV02.1 practice paper

Very low engine oil pressure could be caused by:

• badly seated pressure relief valve

• badly worn crankshaft bearings

• all the answer options shown

• badly worn engine oil pump

Heat from the engine cylinder passes through the cylinder walls by:

• radiation

• expansion

• convection

• conduction

The distance the piston moves from BDC to TDC is a measure related to:

• the clearance volume

• the stroke

• the length of the con-rod

• the bore

Which of the following is most likely to be best suited as engine oil for a modern compression ignition engine?

• SAE90

• TQF

• SAE 5W/40

• Non-detergent

Supplemental Coolant Additives are sometimes added to compression ignition engines to:

• increase the boiling point of the coolant

• decrease the cavitation of the coolant

• decrease the freezing point of the coolant

• increase the cavitation of the coolant

The compression ratio of a compression ignition engine is normally:

• between 16 - 22:1

• between 9 - 10:1

• 150-180 atmospheres

• about 80 - 90%

A compression ignition engine emits blue smoke from the exhaust when under load. The most likely cause of this fault is:

• worn big end bearings

• broken piston rings

• blown head gasket

• blocked oil filter

In order to determine piston clearance accurately you could;

• slide a feeler gauge between the piston and cylinder

• use a vernier caliper to measure the stroke

• measure the piston diameter with a micrometer, set a bore comparator to that measurement then place the comparator in the bore and read off the clearance

• measure the bore and piston diameter with a ruler then subtract the piston measurement from the bore measurement

In what type of CI engine is the combustion chamber machined into the piston crown:

• direct injection

• air injection

• indirect injection

• constant injection

An engine which does not have a pressure-charger induction system fitted is referred to as:

• a two stroke engine

• volumetrically efficient

• a four stroke engine

• naturally aspirated