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This set of Engineering Materials Multiple Choice Questions & Answers (MCQs) focuses on Engineering Materials Set 9
Q1 | X-rays cannot penetrate through
- Wood
- Brass
- Paper
- Lead
- Copper
Q2 | In Brinell hardness testing the time of loading is
- 5 minutes
- 1 minute
- 15 seconds
- 30 seconds
- 10 minutes
Q3 | The property of material by which it can be rolled into sheets is called
- Elasticity
- Creep
- Ductility
- Malleability
- Plasticity
Q4 | Which is amorphous material out of the following?
- Brass
- Zinc
- Lead
- Silver
- Glass
Q5 | The greatest amount of strain energy per unit volume that a material can absorb sithout exceeding its elastic limit is
- Endurance limit
- Proof resilience
- Resilience
- Toughness
- Elastic limit
Q6 | The fatigue limit of a shaft connot be increased by
- Cold working
- Nitriding of the surface
- Shot peening
- Surface decarburisation
- Under stressing
Q7 | A composite bar of steel and copper is heated. The copper bar will be under
- compression
- tension
- torsion
- shear
- None of the above
Q8 | Hot hardness of high speed steels increases due to the addition of
- Tungsten
- Phosphorous
- Chromium
- Vanadium
- None of the above
Q9 | Coal used in a cupola is
- Charcoal
- Coking coal
- Pulverized coal
- Graphite
- Coke
Q10 | In cold working of metals
- Poor surface finish is obtained
- Strength and hardness of steel is increased
- Close dimensional tolerance cannot be maintained
- Grain structure remains unchanged
- Recrystallization temperature for steel is reduced
Q11 | Number of isotopes for iron is
- 2
- 3
- 4
- 1
- Nil
Q12 | A ductile fracture is usually not preceded by
- plastic flow
- deformation
- noise
- large amounts of non-recoverable energy absorption
- None of the above
Q13 | In high speed steel the maximum percentage of any alloying element is
- Chromium
- Carbon
- Tungsten
- Molybdenum
- Vanadium
Q14 | Cemented carbide tools are generally not used for the machining of
- Cast iron
- Aluminium
- Bronze
- Brass
- Steel
Q15 | The structure of common glass is
- Amorphous
- Partially crystalline
- Fully crystalline
- None of the above
- Semi-conductors
Q16 | The purpose of annealing is to
- Produce irregular microstructure
- Harden the surface
- Induce hardness
- Remove stresses
- Induce stresses
Q17 | The behaviour of visco-elastic materials is
- time dependent
- temperature dependent
- orientation dependent
- age-dependent
- None of the above
Q18 | What is the atomic or ionic characteristic that determines the elements of which the atom or iron is representative?
- The nuber of electrons
- The mass
- Vitrified clay
- The number of protons
- The number of neutrons
Q19 | Which of the following increases when copper is hard drawn into wires?
- Diameter
- Cross-sectional area
- Resistivity
- Specific gravity
- None of the above
Q20 | The number of elastic constants for a completely anisotropie elastic material which follows Hooke's law is
- 2
- 21
- 25
- 3
- 4
Q21 | Which of the following materials have maximum magnetic permeability?
- 4% silicon steel
- 13.40%
- Iron carbide
- Pure iron
- Gram oriented Si-Fe
Q22 | Monel metal is
- Aluminium Copper alloy
- Nickel-Chromium alloy
- Aluminium Silver alloy
- Copper Nickel alloy
- Chromium - Molybdenum alloy
Q23 | Copper sheets are manufactured by
- Sintering
- Deep drawing
- Drawing
- Extruding
- Rolling
Q24 | If steel is quenched in water, the structure obtained is
- Martensite
- Acicular
- Troosite
- Sorbite
- Pearlite
Q25 | Brinell and Vickers hardness values are practically identical upto a hardness of
- 300
- 30
- 100
- 10
- 600