1. Cast iron
2. Duralumin
3. Stainless steel
4. Brass
Duralumin
1. Voltage
2. Current
3. Frequency
4. Power factor
Frequency
1. Uniform hardening
2. Hardening the core
3. Selective hardening
4. Hardening surface, for wear resistance
Hardening surface, for wear resistance
1. Oil burner
2. Gas burner
3. Oxy-acetylene
4. None of these
Oxy-acetylene
1. Tungsten, chromium and vanadium
2. Tungsten, chromium and cobalt
3. Tungsten, molybdenum and cobalt
4. Cobalt, nickel and aluminum
Tungsten, molybdenum and cobalt
1. Allotropic
2. Polytrophic
3. Critical point
4. None of these
Allotropic
1. Lowest critical temperature
2. Middle critical temperature
3. Highest critical temperature
4. None of these
Lowest critical temperature
1. Ferrite mainly
2. Pearlite mainly
3. Ferrite and pearlite
4. Pearlite and pearlite
Ferrite mainly
1. Ferrite mainly
2. Pearlite mainly
3. Ferrite and pearlite
4. Pearlite and pearlite
Pearlite and pearlite
1. Varies according to carbon content in it
2. Is constant
3. Depends on the rate of heating
4. None of these
Is constant