Q1. On being hit with a hammer, __________ will readily fracture.
(B) Mild steel
(C) Cast iron
Q2. Which of the following is not a principal alloying element for the structural steel?
Q3. The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
(A) 60 – 100
(B) 400 – 700
(C) 1200 -1500
(D) 2000 – 2300
Q4. Which of the following rays has the least wavelength?
(A) Ultraviolet rays
(B) Infrared rays
(C) Cosmic rays
Q5. Which of the following does not have a sharp melting point?
(D) Pig iron
Q6. Absolute zero pressure can be attained at a temperature of
(D) None of these
Q7. Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
(A) Strain rate is increased
(B) Grain size is increased
(C) Prior cold deformation is increased
(D) Not affected by any of the above parameters
Q8. Recrystallisation temperature of steel is __________ °C.
Q9. Corrosion of metals cannot be prevented by its
Q10. __________ is the most suitable lubricant for drawing mild steel wires?
(C) Sodium stearate
(D) Lime water