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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