Mechanical Engineering MCQs

Page No. 85

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


akcal

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bkcal/kg

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ckcal/m2

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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

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cratio of pressure after compression and before compression

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dswept volume/cylinder volume

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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

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cinjecting excess fuel for raising more load

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dsupplying compressed air to remove combustion products fully

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The designation M 33 x 2 of a bolt means___________________?


ametric threads of 33 nos in 2 cm.

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bmetric threads with cross-section of 33 mm

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cmetric threads of 33 mm outside diameter and 2 mm pitch

✓


dbolt of 33 mm nominal diameter having 2 threads per cm

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Rivets are generally specified by_______________?


athickness of plates to be riveted

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blength of rivet

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cdiameter of head

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dnominal diameter

✓


View Answer nominal diameter

Which of the following is a permanent fastening ?


abolts

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bkeys

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ccotters

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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

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b0.25

✓


c0.50

✖


d0.6

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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

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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

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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

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Buttress threads are usually found on____________________?


ascrew cutting lathes

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bfeed mechanisms

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cspindles of bench vices

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drailway carriage couplings

✓



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


awood-ruff key

✓


bfeather key

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cflat saddle key

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dgib head key

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View Answer wood-ruff key

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