Mechanical Engineering MCQs

Page No. 47

Isotropic materials are those which have the same ____________________?


aelastic properties in all directions

✓


bstresses induced in all directions

✖


cthermal properties in all directions

✖


delectric and magnetic properties in all directions

✖



Stress relaxation is- the phenomenon ___________________?


ain which parts are not loaded

✖


bin which stress remains constant on in-creasing load

✖


cin which deformation tends to loosen the joint and produces a stress reduced

✓


dstress reduces on increasing load

✖



Mild steel belongs to the following category___________________?


alow carbon steel

✓


bmedium carbon steel

✖


chigh carbon steel

✖


dalloy steel

✖


View Answer low carbon steel

Malleability of a material can be defined as ______________________?


aability to undergo large permanent deformations in compression

✓


bability to recover its original form

✖


cability to undergo large permanent deformations in tension

✖


dall of the above

✖



With increase in engine speed, the ignition of spark in petrol engine has to be __________________?


aUnaltered

✖


bIncreased

✖


cDecreased

✖


dAdvanced

✓


View Answer Advanced

Carburretion is done to________________?


afeed petrol into cylinder

✖


bgovern the engine

✖


cbreak up and mix the petrol with air

✓


dheat up the charge to cylinder

✖



The theoretically correct mixture of air and petrol is approximately ________________?


a0.334027778

✖


b0.500694444

✖


c0.625694444

✓


d0.834027778

✖


View Answer 0.625694444

The following type of carburettor is preferred_______________?


aconcentric type

✓


beccentric type

✖


chorizontal type

✖


dvertical type

✖


View Answer concentric type

The basic requirement of a good combustion chamber is___________________?


ahigh compression ratio

✖


blow compression ratio

✖


clow volumetric efficiency

✖


dhigh power output and high thermal efficiency

✓



The part load efficiency of a carburettor is,___________________?


aMaximum

✖


bOptimum

✖


cPoor

✓


dConstant

✖


View Answer Poor

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