Eutectoid composition of carbon steel at room temperature is___________________?

Related Mcqs:

1. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?

   A. Tempering
   B. Hardening
   C. Annealing
   D. Normalising

2. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) ?

   A. T
   B. 1/T
   C. T2
   D. 1/T2

3. Which of the following are made out of the carbon steel having carbon content of 0.9 to 1%?

   A. Small punches, broaches reamers and springs
   B. Cutlery, screws, rivets and files
   C. Mandrels, twist drills, small lathe tools and razors
   D. Forgings like can shaft, structural steel plate, threading dies and drawing dies

4. The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is___________________?

   A. Full annealing
   B. Bright annealing
   C. Patenting
   D. None of these

5. Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that_________________?

   A. Pure oxygen has been used for combustion
   B. Nitrogen percentage in the fuel is very high
   C. Excess air has been used for combustion
   D. Hydrogen is not present in the fuel

6. The ‘transition temperature’ for ductile to brittle behavior of steel increases with increase in the _____________ content in steel?

   A. Carbon
   B. Manganese
   C. Both A nor B
   D. Neither A nor B

7. Which of the following metals cannot be hot worked at room temperature ?

   A. Zinc
   B. Nickel
   C. Lead
   D. Tin

8. One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W. m-1. k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is____________________?

   A. 100
   B. 900
   C. 9000
   D. 10000

9. The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for ______________ at room temperature ?

   A. Air
   B. Water
   C. Mercury
   D. Alcohol

10. The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?

    A. 2300 J
    B. 4600 J
    C. 230 J
    D. 2.3 × 106 J