Metallurgy Set 6

Mechanical Engineering

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This set of Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on Metallurgy Set 6

Q1 | Warping of articles during heat treatment may be due to
  • internal stresses in the article before heating
  • Low specific heat of quenching oil
  • non-uniform cooling
  • non-uniform heating
Answer: internal stresses in the article before heating
Q2 | In eddy current heating of steel, if the depth of heating is to be increased
  • Voltage should be high
  • Some resisting material must be applied on the surface of article to be heated
  • Frequency must be low
  • Time of heating should be high
  • Frequency must be high
Answer: Frequency must be low
Q3 | The maximum percentage of carbon in ferrite is
  • 0.25%
  • 0.03%
  • 0.00%
  • 0.04%
  • 0.13%
Answer: 0.03%
Q4 | The percentage of carbon in cold rolled steel sheets is around
  • 2.10%
  • 0.01%
  • 0.80%
  • 0.10%
  • 1.10%
Answer: 0.10%
Q5 | In a specimen of hardened steel, hard and soft spots indicate
  • Presence of pearlite
  • Fre carbon
  • Presence of cementite
  • Uneven heating
  • Non-uniform composition of steel
Answer: Uneven heating
Q6 | A steel piece after hardening is heated to 300?C and then cooled in oil. The property imparted to the steel piece will be
  • Hardness
  • Annealing
  • Low specific heat of quenching oil
  • Toughness
  • Softness
Answer: Toughness
Q7 | Killed' steel is
  • Steel with less than normal percentage of carbon
  • Steel which has been shaped on a power hammer
  • That steel which is deoxidised in the ladle with silicon and aluminium
  • Steel with more than normal percentage of carbon
  • Steel that has lost its properties due to excessive alloying
Answer: That steel which is deoxidised in the ladle with silicon and aluminium
Q8 | Which of the following metal has the lowest specific gravity?
  • Cast iron
  • Monal metal
  • Copper
  • Bronze
  • Magnesium
Answer: Magnesium
Q9 | The crystal structure of most of the common metals is
  • Hexagonal
  • Cubic
  • Orthorhombic
  • Any of the above
  • None of the above
Answer: Cubic
Q10 | Iron ore which is grey to black in colour and is hard and magnetic, is known as
  • Hematite
  • Siderite
  • Ironite
  • Limonite
  • Magnetite
Answer: Magnetite
Q11 | The slowest cooling rate is achieved when steel is quenched in
  • mixture of water
  • Air
  • Brine
  • fused salt
  • Hardened and tempered
Answer: Air
Q12 | Which of the following material does not have body centred cubic structure?
  • Vanadium
  • Chromium
  • Zirconium
  • Lithium
  • Potassium
Answer: Zirconium
Q13 | The crystal structure of brass is
  • Mixture of all above
  • BCC
  • FCC
  • Orthorhombic
  • HCP
Answer: FCC
Q14 | Which of the following material is used for thermocouple junction?
  • Magnanin
  • Nichrome
  • Invar
  • Petwar
  • White metal
Answer: Magnanin
Q15 | If a sample of steel shown excessive hardness after tempering the probable cause could be
  • Insufficient holding time during tempering
  • Excessive proportion of alloying elements
  • High temperature during tempering
  • Change in volume during cooling
  • None of the above
Answer: Insufficient holding time during tempering
Q16 | Which of the following is usually not a constituent of paints?
  • Career
  • Vehicle
  • Pigment
  • Drier
  • None of the above
Answer: Career
Q17 | Magnetism is non-linearly related to the applied field in case of
  • Diamagnetic field
  • Paramagnetic field
  • Ferromagnetic field
  • All of the above
  • None of the above
Answer: Ferromagnetic field
Q18 | Above the curie temperature, a magnetic material becomes
  • Diamagnetic
  • Paramagnetic
  • Ferromagnetic
  • Dielectric
  • None of the above
Answer: Paramagnetic
Q19 | Which of the follwing is usually made of mild steel?
  • Drop forgings
  • Fish plates
  • Shear blades
  • Channels
  • Die blocks
Answer: Channels
Q20 | Bell metal is an alloy of
  • Copper and lead
  • Coper, tin, lead and zinc
  • Copper, antimony, aluminium and zinc
  • Copper and tin
  • Copper, lead and tin
Answer: Copper and tin
Q21 | Which of the following material has body centred cubic structure?
  • Magnesium
  • Cadmium
  • Glass
  • Zinc.
  • Molybdenum
Answer: Molybdenum
Q22 | The measurement junction of a thermocouple is taken from an environment of 300?C to 600?C. If time constant of the thermocouple is 1 second, temperature indicated by it, in ?C, after 1 second would be about
  • 400
  • 457
  • 497
  • 600
  • 100
Answer: 497
Q23 | Capacity of a cupola is expressed in terms of
  • Diameter of drum
  • Height of drum
  • Tons of castings it can produce in one charge
  • Tons of coke it can take in one charge
  • None of the above
Answer: Tons of castings it can produce in one charge
Q24 | If an article develops insufficient hardening after quenching, the defect can be corrected by
  • removing scale from surface
  • normalising or annealing followed by hardening
  • reheating the article in oxidizing atmosphere and quenching
  • Any of the above
  • Low specific heat of quenching oil
Answer: normalising or annealing followed by hardening
Q25 | Cast iron pipes are manufactured by
  • Centrifugal casting method
  • Die casting method
  • Lost wax method
  • Shell moulding method
  • Sand acting method
Answer: Centrifugal casting method
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