Mechanical Engineering MCQs

Page No. 85

The calorific value of gaseous fuels is expressed in terms of__________________?


akcal


bkcal/kg


ckcal/m2


dkcal/m²


View Answer kcal/m²

Compression ratio of LC. engines is ___________________?


athe ratio of volumes of air in cylinder before compression stroke and after compression stroke


bvolume displaced by piston per stroke and clearance volume in cylinder


cratio of pressure after compression and before compression


dswept volume/cylinder volume



Supercharging is the process of_____________________?


asupplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere


bproviding forced cooling air


cinjecting excess fuel for raising more load


dsupplying compressed air to remove combustion products fully



The designation M 33 x 2 of a bolt means___________________?


ametric threads of 33 nos in 2 cm.


bmetric threads with cross-section of 33 mm


cmetric threads of 33 mm outside diameter and 2 mm pitch


dbolt of 33 mm nominal diameter having 2 threads per cm



Rivets are generally specified by_______________?


athickness of plates to be riveted


blength of rivet


cdiameter of head


dnominal diameter


View Answer nominal diameter

Which of the following is a permanent fastening ?


abolts


bkeys


ccotters


drivets


View Answer rivets

If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to___________________?


a0.2


b0.25


c0.50


d0.6


View Answer 0.25

Jam nut is a locking device in which _____________________?


aone smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming


ba slot is cut partly in middle of nut and then slot reduced by tightening a screw


ca hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip


dthrough slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end



Buttress threads are usually found on____________________?


ascrew cutting lathes


bfeed mechanisms


cspindles of bench vices


drailway carriage couplings



A key capable of tilting in a recess milled out in a shaft is known as______________________?


awood-ruff key


bfeather key


cflat saddle key


dgib head key


View Answer wood-ruff key

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