3) Scavenging air in diesel engine means

air used for combustion sent under pres-sure

forced air for cooling cylinder

burnt air containing products of combustion

air used for forcing burnt gases out of engine′s cylinder during the exhaust period

Answer is:

air used for forcing burnt gases out of engine′s cylinder during the exhaust period

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4) Supercharging is the process of

supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

providing forced cooling air

injecting excess fuel for raising more load

supplying compressed air to remove combustion products fully

Answer is:

supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

5) Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?

yes

to some extent

unpredictable

Answer is:

no

6) The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called

net efficiency

efficiency ratio

relative efficiency

overall efficiency

Answer is:

relative efficiency

7) Compression ratio of I.C. engines is

the ratio of volumes of air in cylinder before compression stroke and after compression stroke

volume displaced by piston per stroke and clearance volume in cylinder

ratio of pressure after compression and before compression

swept volume/cylinder volume

Answer is:

the ratio of volumes of air in cylinder before compression stroke and after compression stroke

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3) Scavenging air in diesel engine means

air used for forcing burnt gases out of engine′s cylinder during the exhaust period

IC Engines MCQ with Answers

Related IC Engines MCQ with Answers

4) Supercharging is the process of

supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

5) Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?

no

6) The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called

relative efficiency

7) Compression ratio of I.C. engines is

the ratio of volumes of air in cylinder before compression stroke and after compression stroke

IC Engines MCQ with Answers