Mechanical Engineering MCQs

Page No. 87

A backing ring is used inside the pipe joint when making a___________________?


abutt weld

✓


bfillet weld

✖


csleeve weld

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dsocket weld

✖


View Answer butt weld

Castle 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 is 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

✖


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

✓



Gear box is used___________________?


ato produce torque

✖


bfor speed reduction

✖


cto obtain variable speeds

✓


dto increase efficiency of system

✖



The piston rod of a steam engine is usually connected to the cross head by means of__________________?


abolted joint

✖


bkunckle joint

✖


ccotter joint

✓


duniversal joint

✖


View Answer cotter joint

Spring index is___________________?


aratio of coil diameter to wire diameter

✓


bload required to produce unit deflection

✖


cits capability of storing energy

✖


dindication of quality of spring

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Form coefficient of spring is _____________________?


aratio of coil diameter to wire diameter

✖


bload required to produce unit deflection

✖


cits capability of storing energy

✓


dconcerned With strength of wire of spring

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When two springs are in series (having stiffness K), the equivalent stiffness will be________________?


aK

✖


bK/2

✓


c2K

✖


dKIA

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View Answer K/2

If a spring is cut down into two springs, the stiffness of cut springs will be _________________?


ahalf

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bsame

✖


cdouble

✓


dunpredictable

✖


View Answer double

Aircraft body is usually fabricated by_________________?


awelding

✖


bprecasting

✖


crivetting

✓


dcasting

✖


View Answer rivetting

In hydrodynamic bearings_____________________?


athe oil film pressure is generated only by the rotation of the journal

✓


bthe oil film is maintained by supplying oil under pressure

✖


cdo not require external supply of lubricant

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dgrease is used for lubrication

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