Mechanical Engineering MCQs

Page No. 32

Admiralty gun metal contains__________________?


a63 to 67% nickel and 30% copper

✖


b88% copper, 10% tin and rest zinc

✓


calloy of tin, lead and cadmium

✖


diron scrap and zinc

✖



Free cutting steels_____________________?


aare used where ease in machining is the criterion

✓


bcontain carbon in free form

✖


crequire least cutting force

✖


ddo not exist

✖



Permalloy is a___________________?


akind of stainless steel

✖


bnone ferrous alloy

✖


cpolymer

✖


dnickel and iron alloy having high permeability

✓



The alloy used for making electrical resistances and heating elements is____________________?


anichrome

✓


binvar

✖


cmagnin

✖


delinvar

✖


View Answer nichrome

Gun metal contains__________________?


a70% copper and 30% zinc

✖


b90% copper and 10% tin

✖


c85-92% copper and rest tin with little lead and nickel

✓


d70-78% copper and rest tin

✖



Bronze contains_____________________?


a70% copper and 30% zinc

✖


b90% copper and 10% tin

✓


c85-92% copper and rest tin with little lead and nickel

✖


d70-75% copper and rest tin

✖



Structural steel contains following principal alloying elements__________________?


anickel, chromium and manganese

✓


btungsten, molybdenum and phosphorous

✖


clead, tin, aluminium

✖


dzinc, sulphur, and chromium

✖



Which of the following is used for bearing liner_______________?


agun metal

✖


bbronze

✖


cbell metal

✖


dbabbit metal

✓


View Answer babbit metal

If a refractory contains high content of silicon, it means refractory is__________________?


aacidic

✖


bbasic

✖


cneutral

✓


dbrittle

✖


View Answer neutral

Corrundum contains more than 95% _____________________?


asteel

✖


bA1203

✓


cSi02

✖


dMgO

✖


View Answer A1203

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