85. Which of the following is the binding material in cemented carbides
A.Cobalt
B.Nickel
C.Vanadium
D.Iron

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86. Chromium in steel
A.Improves wear resistance, cutting ability and toughness
B.-refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C.Improves cutting ability and reduces hardenability
D.Gives ductility, toughness, tensile strength and anticorrosion properties

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87. Manganese in steel increases its
A.Tensile strength
B.Hardness
C.Ductility
D.Fluidity

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88. Cemented carbide tools are not found to be suitable for cutting
A.Brass
B.Cast iron
C.Aluminium
D.Steel

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89. Sulphur in steel
A.Acts as deoxidiser
B.Reduces the grain size
C.Decreases tensile strength and hardness
D.Lowers the toughness and transverse ductility

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90. Tungsten in steel
A.Improves wear resistance, cutting ability and toughness
B.Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C.Improves cutting ability and reduces hardenability
D.Gives ductility, toughness, tensile strength and anticorrosion properties

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91. Tungsten in high speed steel provides
A.Hot hardness
B.Toughness
C.Wear resistance
D.Sharp cutting edge

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