Engineering Materials Set 10

Mechanical Engineering

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This set of Engineering Materials Multiple Choice Questions & Answers (MCQs) focuses on Engineering Materials Set 10

Q1 | If a material has similar properties throughout its volume, it is said to be
  • Homogeneous
  • Uniform
  • Isentropic
  • Continuous
  • Isotropic
Answer: Homogeneous
Q2 | Which of the following material can withstand maximum shocks without failure?
  • Malleable cast iron
  • Pig iron
  • Gray cast iron
  • Chilled cast iron
  • White cast iron
Answer: Malleable cast iron
Q3 | Heavy water is obtained by
  • Slow evaporation of water
  • Low temperature, low pressure distillation
  • Rapid evaporation of water
  • Repeared purification
  • Prolonged electrolysis of water
Answer: Prolonged electrolysis of water
Q4 | Identify the incorrect statement
  • Fatigue strength is seriously reduced by the introduction of a stress raiser such as a notch or hole
  • A fatigue failure is particularly insidous, because it occurs without any warning
  • Fatuge results in a brittle fracture with no gross deformation at the fracture
  • As the roughness of surface increses the fatigue life of speoimen increases
  • None of the above
Answer: As the roughness of surface increses the fatigue life of speoimen increases
Q5 | Pipes for bicycle frames are made of
  • Cold rolled steel
  • Carbon chrome steel
  • Stainless steel
  • Cast iron
  • Hot rolled steel
Answer: Cold rolled steel
Q6 | When a Ge-crystal is doped with phosphorous atom, it becomes
  • Photo sensitive
  • N-type semi-conductor
  • A ferite
  • An insulator
  • P-type semi-conductor
Answer: N-type semi-conductor
Q7 | The graphite rods in a nuclear pile
  • Furnish alpha beta particles
  • Furnish alpha particles
  • Furnish neutron to fission U235
  • Undergo combustion which triggers the fission reaction
  • Convert fast moving neutrons into thermal neutrons
Answer: Convert fast moving neutrons into thermal neutrons
Q8 | Bakelite is
  • a semi-conductor
  • uncombustible
  • a low resistance conducted
  • a polarised insulator
  • None of the above
Answer: uncombustible
Q9 | The material which undergo recoverable deformation and exhibit rubber like elsticity are called
  • Pure elastic materials
  • Elastomers
  • Rubbers
  • Creep-elastic
  • None of the above
Answer: Elastomers
Q10 | Cold worked components are generally subjected to
  • Annealing
  • Hardening
  • Shot peening
  • Tempering
  • Sherodising
Answer: Annealing
Q11 | Figure of merit is used to
  • compare the efficiency of chermoelectric materials
  • measure the extent of doping of intrinsic semi-conductors
  • compare the extent of purity of semi-seonuctor materials
  • None of the above
  • None of the above
Answer: compare the efficiency of chermoelectric materials
Q12 | An elastic behaviour of materials is expressed in terms of
  • Hysteresis loop area
  • Adiabatic time
  • Relaxation time
  • Isothermal time
  • Stress strain curve
Answer: Adiabatic time
Q13 | Metal spinning
  • Is done on symmetrical articles
  • Utilises point hard tools
  • Is done on unsymmetrical articles
  • Does not require dies
  • Is done at low speeds
Answer: Is done on symmetrical articles
Q14 | Trimming is a process associated with
  • Machining of metals
  • Press work
  • Electro plating
  • Polishing of metals
  • Forging
Answer: Forging
Q15 | The property by which a body returns to its original shape after the removal to the load is called
  • Softness
  • Plasticity
  • Elasticity
  • Ductility
  • Malleability
Answer: Elasticity
Q16 | The phenomenon of weld decay is found in
  • Cast iron
  • Bronze
  • Brass
  • Gun metal
  • Stainless steel
Answer: Stainless steel
Q17 | Which of the following is the major constituent of corundum?
  • Carbon
  • SiO2
  • Diamond
  • MgCl2
  • Al2O3
Answer: Al2O3
Q18 | Which of the following material has highest specific gravity?
  • High carbon steel
  • Copper
  • Brass
  • Lead
  • Aluminium
Answer: Lead
Q19 | The number of semi-conductors in periodic table is
  • 3
  • 5
  • 7
  • 13
  • None of the above
Answer: 13
Q20 | The operation of cutting out flat areas to some desired shape and which is generally the first step in a series of operations is known as
  • Lancing
  • Coining
  • Slitting
  • Curling
  • Blanking
Answer: Blanking
Q21 | The material for wire drawing should have
  • High hardness
  • High melting point
  • Low boiling point
  • Stiffness
  • High ductility
Answer: High ductility
Q22 | Which one of the following is usually most ductile?
  • Hexagonal close packed lattice
  • Body centred cubic lattice
  • Face centred cubic lattic
  • Combination of (A) and (C) above
  • None of the above
Answer: Face centred cubic lattic
Q23 | The maximum hardenability of any steel depends on
  • The carbon content
  • The chemical composition
  • The grain size
  • The alloying elements present
  • None of the above
Answer: The carbon content
Q24 | In case of biaxial stress system when a member is subjected to tensile stresses in two perpendicular directions the maximum shear stress in case of mild steel occurs on a plane inclined at
  • 22
  • 90?
  • 30?
  • 0?
  • 45?
Answer: 45?
Q25 | Steel may be manufactured by
  • Bessemer process
  • Open hearth process
  • Cementation process
  • Duplex process
  • Any of the above
Answer: Open hearth process
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