Which of the following is used for bearing liner_______________?

A. Gun metal
B. Bronze
C. Bell metal
D. Babbit metal

Corrundum contains more than 95% _____________________?

A. Steel
B. A1203
C. Si02
D. Mgo

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

A. Acidic
B. Basic
C. Neutral
D. Brittle

Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_________________?

A. 50 : 50
B. 30 : 70
C. 70 : 30
D. 40 : 60

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 unmachinable
C. Is produced by annealing process. it is soft, tough and easily machined metal
D. Is produced by small additions of magnesium (or creium) in the ladle. graphite is in nodular or spheroidal form and is well dispersed throughout the material

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 : 10 : 20
D. 30 : 20 : 30 : 20

The usual composition of a soldering alloy is__________________?

A. Tin, lead and small percentage of antimony
B. Tin and lead
C. Tin, lead and silver
D. Tin and copper

Corrosion resistance of steel is increased by adding__________________?

A. Chromium and nickel
B. Nickel and molybdenum
C. Aluminium and zinc
D. Tungsten and sulfur

The crystal structure of brass is_________________?

A. F.c.c.
B. c.c.
C. H.c.p.
D. Orthorhombic crystalline structure

Brass contains___________________?

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin