The slowest cooling rate is achieved when steel is quenched in
A.fused salt
B.Air
C.Brine
D.mixture of water
Category: Metallurgy Mcqs
Uniformity of zinc coating on pipes is tested by
A.Dipping the sample in water
B.Dipping the sample for 1 minute in conc, hydrochloric acid
C.Dipping the sample for 1 minute in neutral copper sulphate solution
D.Dipping the sample for 10 minutes in calcium hydroxide solution
E.By passing electric current for 1 hour
Which of the following is not true in case of white cast iron
A.It is whitish in colour
B.It is strong
C.It is hard
D.It is brittle
E.It is malleable
Vicker’s hardness number of diamond could be of the order of
A.15000
B.12000
C.8000
D.4000
E.800
Which of the following is not a constituent of Stellite?
A.Cobalt
B.Tungsten
C.Ferrous
D.Chromium
E.All of the above
Which of the follwing is usually made of mild steel?
A.Drop forgings
B.Fish plates
C.Shear blades
D.Channels
E.Die blocks
Which colour of heat represents the highest temperature?
A.Blood red
B.Salmon
C.Dry cherry
D.White
Killed’ steel is
A.Steel which has been shaped on a power hammer
B.Steel with less than normal percentage of carbon
C.Steel with more than normal percentage of carbon
D.Steel that has lost its properties due to excessive alloying
E.That steel which is deoxidised in the ladle with silicon and aluminium
Which of the following form of iron is produced as a result of annealing of white cast iron?
A.Malleable iron
B.Grey iron
C.Nodular iron
D.Spheroidal iron
E.Wrought iron
When steel is made from phosphatic iron, it is likely to be
A.Malleable
B.Ductile
C.Hard
D.Brittle
E.Tough
