Gun metal contains__________________? A. 70% copper and 30% zinc B. 90% copper and 10% tinC. 85-92% copper and rest tin with little lead and nickel D. 70-78% copper and rest tin E. 85-92% copper and rest zinc

Bronze contains_____________________? A. 70% copper and 30% zincB. 90% copper and 10% tin C. 85-92% copper and rest tin with little lead and nickel D. 70-75% copper and rest tin E. 90% copper and 10% zinc

Structural steel contains following principal alloying elements__________________? A. nickel, chromium and manganese B. tungsten, molybdenum and phosphorous C. lead, tin, aluminium D. zinc, sulphur, and chromium E. none of the above

Which of the following is used for bearing liner_______________? A. gun metal B. bronze C. bell metalD. babbit metal E. brass

If a refractory contains high content of silicon, it means refractory is__________________? A. acidic B. basicC. neutral D. brittle E. none of the above

Corrundum contains more than 95% _____________________? A. steelB. A1203 C. Si02 D. MgO E. german silver

Ductile cast iron___________________? A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron B. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost…

Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_________________? A. 50 : 50B. 30 : 70 C. 70 : 30 D. 40 : 60 E. 60 : 40

Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________? A. 50 : 20 : 20 : 10 B. 40 : 30 : 20 : 10 C. 50 : 20 :…

Corrosion resistance of steel is increased by adding__________________? A. chromium and nickel B. nickel and molybdenum C. aluminium and zinc D. tungsten and sulfur E. none of the above