Mechanical Engineering MCQs

Page No. 57

Self-ignition temperature of petrol is of the order of___________________?


a150°C

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b240°C

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c370°C

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dmore than 500°C.

✓


View Answer more than 500°C.

Octane number is determined by comparing the performance of the petrol with the following hydrocarbons__________________?


aiso-octane

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bmixture of normal heptane and iso-oc-tane

✓


calpha methyl napthalene

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dmixture of methane and ethane

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Ethyl fluid is used_______________________?


ato increase the octane rating of the fuel

✓


bto increase the cetane rating of the fuel

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cas a defrosting agent

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das a superior type of fluid compared to others

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Normal heptane_______________?


aaccelerates auto-ignition

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bhelps to resist auto-ignition

✓


cdoes not affect auto-ignition

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dhas no relation with auto-ighition

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Which is correct statement about reaction time for autoignition of fuel and the fuel air ratio__________________?


alean mixture has high reaction time

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brich mixture has high reaction time

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cchemically correct mixture has mini-mum reaction time

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dall of the above

✓


View Answer all of the above

Ignition lag is__________________?


athe time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature

✓


btime before actual fuel injection and the pump plunger starts to pump fuel

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ctime corresponding to actual injection and top dead center

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dtime corresopnding to actual ingition and top dead center

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Violent sound pulsations within the cylinder of an I.C. engine are caused due to_________________?


aheavy turbulence

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bimproved scavenging

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cheavy supercharging

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ddetonation

✓


View Answer detonation

Cetane number is determined by comparing the performance of diesel oil with the following hydrocarbons___________________?


acetane

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bmixture of cetane and alphamethyl napthalene

✓


cethylene dibromide

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dmixture of aldehydes and ketones

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The self-ignition temperature of diesel oil compared to petrol is_________________?


ahigher

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blower

✓


csame

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ddepends on quality of fuel

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View Answer lower

Cetane___________________?


ahas zero cetane number

✖


bhas 100 cetane number

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chelps detonation

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dis a straight chain paraffin

✓



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