A hardness value of 1400 BHN can be expected in case of
A.Cementite
B.Ferrite
C.Pearlite
D.All of the above
E.None of the above
Category: Metallurgy Mcqs
Which of the following element does not impart hardness to steel?
A.Copper
B.Nickel
C.Silicon
D.Chromium
E.None of the above
The depth of hardening is affected by
A.Size of specimen
B.Hardenability of steel
C.Quenching medium
D.All of the above
If an article develops insufficient hardening after quenching, the defect can be corrected by
A.removing scale from surface
B.normalising or annealing followed by hardening
C.reheating the article in oxidizing atmosphere and quenching
D.Any of the above
Which of the following material is used for permanent magnets?
A.Alnico
B.Delta metal
C.Elnivar
D.Invar
E.Duralumin
Fusible plug for boilers consists of
A.Lead, tin and mercury
B.Copper, lead and tin
C.Zinc, copper and lead
D.Bismuth, lead and tin
E.Zinc, bismuth and tin
Eddy currents
A.Increase with frequency
B.Increase with square of frequency
C.Increase with cube of frequency
D.Increase with fourth power of frequency
E.Increase as inverse of frequency
Welding process used in fabrication of car bodies is
A.Arc welding
B.Resistance welding
C.Thermit welding
D.Brazing
E.Soldering
Carbon percentage in steel for carburizing is usually
A.1.5 percent
B.1 percent
C.0.8 percent
D.0.6 percent
E.0.15 percent
Normal mercury thermometer can be used upto
A.100?C
B.212?C
C.300?C
D.500?C
E.800?C
