A.by avoiding sharp projections and sudden transitions from thick to thin sections
B.articles should be free from stress before heat treatment
C.heat to minimum stable temperature for hardening
D.Any of the above
A.Eddy currents
B.Stray magnetic fields
C.High voltage
D.High power
E.High resistance of contact surface
A.Iron
B.Silver
C.Copper
D.Aluminium
E.Brass
A.25 mm dia ball
B.15 mm dia ball
C.10 mm dia ball
D.Conical indentor with 120? apex angle
E.Diamond square-based pyramid
A.1 to 7
B.7 to 14
C.1 to 14
D.6 to 11
E.Complete protection is provided
A.Aluminium
B.Stainless steel
C.Nickel
D.Platinum
E.Chromium
A.Copper
B.Silver
C.Tin
D.Lead
E.Nickel
A.35 – 45 kg/mm2
B.50 – 60 kg/mm2
C.60 – 75 kg/mm2
D.75 – 90 kg/mm2
E.90 – 100 kg/mm2
A.Slag
B.Flue dust
C.Blast furnace gas
D.All of the above
E.None of the above
A.Dead mild steel
B.Medium carbon steel
C.High carbon steel
D.Wrought iron
E.Cast iron
