Mechanical Engineering MCQs

Page No. 81

The knock in diesel engine occurs due to____________________?


ainstantaneous and rapid burning of the first part of the charge


binstantaneous atuo iginition of last part of charge


cdelayed burning of the first part of the charge


dreduction of delay period



Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided__________________?


ait is properly designed


bbest quality fuel is used


ccan not work as it is impossible


dflywheel size is proper



A diesel engine has_________________?


a1 valve


b2 valves


c3 valves


d4 valves


View Answer 3 valves

A hmh flame speed is obtained in diesel engine when air fuel ratio is_______________?


auniform throughout the mixture


bchemically correct mixture


cabout 3-5% rich mixture


dabout 10% rich mixture



Volatility of diesel fuel oil is_________________?


aminimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame


btemperature at which it solidifies or congeals


cit catches fire without external aid


dindicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off



A 5 BHP engine running at full load would consume diesel of the order of_________________?


a0.3 kg/hr


b1 kg/hr


c3 kg/hr


d5 kg/hr


View Answer 1 kg/hr

The following volume of air is required for consuming 1 liter of fuel by a four stroke engine_______________?


a1 m3


b5 m3


c5-6 m3


d9-10 m3


View Answer 9-10 m3

Air fuel ratio at which a petrol engine can not work is_________________?


a8 : 1


b10 : 1


c15 : 1


d20 : 1 and less


View Answer 20 : 1 and less

The theoretically correct air fuel ratio for petrol engine is of the order of___________________?


a6 : 1


b9 : 1


c12 : 1


d15 : 1


View Answer 15 : 1

Scavenging is usually done to increase__________________?


athermal efficiency


bspeed


cpower output


dfuel consumption


View Answer power output

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