Internal Combustion Engine 2010 Objective Paper


51) Fuel oil penetration into the cylinder of a diesel engine is

a)dependent on air turbulence

b)reduced by finer atomization

c)increased by finer atomization

d)non-existent in the precombustion chamber system

Answer-B


52) Precombustion chambers, air cells, and energy cells in high-speed, small bore diesel engines all serve to increase

a)firing pressure

b)ignition quality of fuel

c)fuel-air ratio during compression

d)turbulence

Answer-D


53). Which of the following statements best describes the operational characteristics of an isochronous governors?

a)they are suitable for use on main propulsion units

b)they strive to maintain a constant engine speed for all values of steady load

c)they cause a proportional drop in engine speed as the load is increased

d)they have poor sensitivity at high RPM.

Answer-B


54). Theoretical perfect combustion in a diesel engine yields by-products of

a)aldehydes and carbon dioxide

b)water vapour and carbon monoxide

c)nitrogen and carbon monoxide

d)water vapour and carbon dioxide

Answer-D


55) Combustion knock can occur in the cylinders of a diesel engine under any condition permitting

a)a shortened ignition delay period

b)a lean fuel/air mixture

c)excess fuel in the combustion chamber

d)rapid vaporisation of injected fuel droplets

Answer-C


56) When exessive fuel dilution is noted in the lube oil, the oil should be

a)centrifuged

b)filtered

c)strained

d)changed

Answer-D


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