Mechanical Engineering MCQs

Page No. 56

The top piston ring nearer to the piston crown is known as_____________________?


acompression ring

✓


boil ring

✖


cscrapper ring

✖


dgroove ring

✖


View Answer compression ring

Piston rings are usually made of___________________?


acast iron

✓


baluminium

✖


cphosphor bronze

✖


dbabbitt

✖


View Answer cast iron

Which is false statement about advantages of V-type engine_________________?


acompact design requiring lesser space

✖


bimproved distribution of air to cylinder

✖


ccasting less liable to distortion

✖


dless overhead clearance

✓



Detonation is caused by the following unstable compounds______________________?


aperoxides, aldehydes and ketones

✓


bperoxides, aldehydes, oxides and sul-phides

✖


caldehydes, oxides and ketones

✖


dketones and sulphur compounds

✖



The function of a fuel pump in a petrol pump is to______________________?


ainject fuel in cylinder

✖


bsupply fuel when carburettor fails

✖


cpump fuel so that it reaches carburettor (to improve thermal efficiency)

✓


ddoes not exist

✖



The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?


ahigher

✖


blower

✓


csame

✖


ddepends on size of engine

✖


View Answer lower

The spark plug gap is normally maintained at________________?


a0.1 to 0.2 mm

✖


b0.2 to 0.4 mm

✖


c0.45 to 0.6 mm

✓


d0.6 to 0.8 mm

✖


View Answer 0.45 to 0.6 mm

The delay period in petrol engine is of the order of__________________?


a0.001 sec

✖


b0.002 see

✓


c0.01 sec

✖


d0.05 sec

✖


View Answer 0.002 see

Auto-ignition temperature 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

✖


cthat at which it catches fire without external aid

✓


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

✖



Petrol is distilled at a temperature in range of__________________?


a30 – 65°C

✖


b65 – 220°C

✓


c220-350°C

✖


d350-450°C

✖


View Answer 65 – 220°C

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