Quiz 3

The alloy of copper and zinc is known as ...

• brass

• nickel

• bronze

• none given

• lead

Aluminium alloys strength can be improved by the following except

• quenching

• cold working

• alloying

• precipation hardening

The following are significant to copper alloys except,

• resistance to corrosion

• high thermal conductivity

• malleable

• strengthened by heat treatment

Refractory metals are ..

• niobium, molybdenum, tantalum, tungsten

• niobium, molybdenum, tantalum, tungsten, aluminium oxide, silicon carbide

• niobium, molybdenum, tantalum, aluminium oxide, tungsten

• niobium, molybdenum

Properties of refractory metals are ... except

• very strong interatomic bonding

• large elastic moduli

• high strength

• high hardness

  at elevated temperature

• none

Nickel-based superalloys are the material of choice for ..

• high-temperature structural applications, especially resistance to creep and fatigue

• high-temperature structural applications, especially high tensile strength

• high-temperature structural applications, especially high impact strength

• high-temperature structural applications, especially high hardness

Nickel is added in stainless steel to increase ..

• high-temperature strength and corrosion resistance

• high-temperature electrical conductivity and corrosion resistance

• high-temperature linear expansion and corrosion resistance

• high-temperature corrosion resistance

Usually softer constituent of a composite is

• Matrix

• Fiber

• Both

Al-alloys for engine/automobile parts are reinforced to increase their ..

• Strength

• Wear resistance

• Elastic modulus

• Thermal expansion

• Density

(I) The matrix binds fiber reinforcement and determines the surface quality.

(II) Fibre-reinforced MMC consist of layer of materials

• (I) and (II) are TRUE

• (I) and (II) are FALSE

• (I) is TRUE and (II) is FALSE

• (II) is TRUE and (I) is FALSE