⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs51
Blast furnace produces following by reduction of iron ore_______________?
Acast iron
Bpig iron
Cwrought iron
Dmalleable iron E. white iron
52
Melting point of iron is__________________?
A1539°C
B1601°C
C1489°C
D1712°C E. 1131°C
53
Which of the following elements does not impart hardness to steel__________________?
Acopper
Bchromium
Cnickel
Dsilicon E. none of the above
54
Nodular iron has____________________?
Ahigh maehinability
Blow melting point
Chigh tensile strength
Dgood fluidity E. all of the above
55
The hardness of steel increases if it contains____________________?
Aaustenite
Bmartensite
Cpearlite
Dcementite E. all of the above
56
Cobalt in steel __________________?
Aimproves wear resistance, cuttinability and toughness
Brefines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties
Cimproves cutting ability and reduce hardenability
Dgives ductility, toughness, tensile strength and anti corrosion property: E. none of the above
57
Tensile strength of steel can be safely in-creased by________________?
Aadding carbon up to 2.8%
Badding carbon up to 6.3%
Cadding carbon up to 0.83%
Dadding small quantities of copper E. adding copper and carbon
58
Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_________________?
A50 : 50
B30 : 70
C70 : 30
D40 : 60 E. 60 : 40
59
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?
A50 : 20 : 20 : 10
B40 : 30 : 20 : 10
C50 : 20 : 10 : 20
D30 : 20 : 30 : 20 E. 50 : 10 : 20 : 20
60
Corrosion resistance of steel is increased by adding__________________?
Achromium and nickel
Bnickel and molybdenum
Caluminium and zinc
Dtungsten and sulfur E. none of the above