Mechanical Engineering MCQs

Page No. 172

The shrinkage allowance for cast iron pattern is________________?


a15 mm/m


b20 mm/m


c26 mm/m


d10 mm/m


View Answer 10 mm/m

In spot welding, the spacing between two spot weld should not be less than _______________?


ad


b1.5d


c3d


d6d


View Answer 3d

Lancing is the operation of _________________?


acutting a sheet of metal through part of its length and then bending the cut portion


bremoval of metal to the desired shape from the edge of a plate


ccutting a sheet of metal in a straight line along the length


dbending a sheet of metal along a curved axis



The cold working of metals is carried out_________________?


abelow the recrystallisation temperature


bat the recrystallisation temperature


cat any temperature


dabove the recrystallisation temperature



A neutral flame is obtained by supplying___________________?


amore volume of acetylene and less volume of oxygen


bequal volumes of oxygen and acetylene


cmore volume of oxygen and less volume of acetylene


dnone of the above



In a _____________ , both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram?


aprogressive die


bsimple die


ccompound die


dcombination die


View Answer combination die

A file removes the metal during___________________?


aboth forward and return strokes


bforward stroke


creturn stroke


dnone of these


View Answer forward stroke

In jet engines the products of combustion after passing through the gas lurbine are discharged into_______________?


aatmosphere


bback to the compressor


cdischarge nozzle


dvacuum


View Answer discharge nozzle

If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity______________?


aVi=V0B


bVt>V0


cU,


dV,= U0


View Answer Vi=V0B

The working fluid in ai turbine is___________________?


ain two phases


bin three phases


cin a single phase


din the form of air and water mixture


View Answer in a single phase

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