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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