Internal Combustion Engine 2012 Objective Paper


89) Which of the bearings listed is most widely used for main and connecting rod bearings of modern diesel engines?

a)Steel-lined

b)Poured babbitt, self-aligning

c)Split roller

d)Precision insert

Answer-D


90) Directional intake ports in diesel engines are used to

a)reduce air charge turbulence

b)induce air swirl

c)deflect hot combustion gas away from the valves

d)oppose the effects of piston induced squish

Answer-B


91) Diesel engine main and connecting rod precision bearings are made in halves. Each half exceeds one-half the bearing circumference by a small amount. The small amount is termed

a)clearance

b)crush

c)pitch

d)thrust

Answer-B


92) The piston rod scraper box incorporated in a single acting two-stroke/cycle, crosshead diesel engine serves to

a)eliminate the necessity for an oil scraper ring

b)prevent side thrust and cylinder scoring

c)prevent sludge and dirty oil from entering the crankcase

d)scrape oil and carbon deposits off the cylinder walls

Answer-C


93) The proper location for journal bearing oil grooves is

a)in the region of the load bearing surface

b)as a side relief where the two shells meet

c)at the bottom of the bearing

d)halfway between bottom and where shells meet

Answer-B


94) How are hydraulic valve lash adjusters on diesel engine rocker arm assemblies lubricated?

a)Cup-fed grease

b)Sealed self-lubricators

c)Metered hydraulic oil supply

d)Forced lube oil supply

Answer-D


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