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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