Mechanical Engineering MCQs

Page No. 57

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


a150°C


b240°C


c370°C


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


bmixture of normal heptane and iso-oc-tane


calpha methyl napthalene


dmixture of methane and ethane



Ethyl fluid is used_______________________?


ato increase the octane rating of the fuel


bto increase the cetane rating of the fuel


cas a defrosting agent


das a superior type of fluid compared to others



Normal heptane_______________?


aaccelerates auto-ignition


bhelps to resist auto-ignition


cdoes not affect auto-ignition


dhas no relation with auto-ighition



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


alean mixture has high reaction time


brich mixture has high reaction time


cchemically correct mixture has mini-mum reaction time


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


ctime corresponding to actual injection and top dead center


dtime corresopnding to actual ingition and top dead center



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


aheavy turbulence


bimproved scavenging


cheavy supercharging


ddetonation


View Answer detonation

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


acetane


bmixture of cetane and alphamethyl napthalene


cethylene dibromide


dmixture of aldehydes and ketones



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


ahigher


blower


csame


ddepends on quality of fuel


View Answer lower

Cetane___________________?


ahas zero cetane number


bhas 100 cetane number


chelps detonation


dis a straight chain paraffin



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