Which of the following material is used for permanent magnets?
A.Alnico
B.Delta metal
C.Elnivar
D.Invar
E.Duralumin
Category: Metallurgy Mcqs
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
Which of the following materials are usually most ductile?
A.Hexagonal close-packed lattice
B.Face centred cubic lattice
C.Body centred lattice
D.Amorphous
E.Non-metallic
The percentage of sulphur in steel can be reduced by adding
A.Manganese
B.Copper
C.Zinc
D.Magnesium
E.Chormium
Iron ore which is grey to black in colour and is hard and magnetic, is known as
A.Hematite
B.Limonite
C.Siderite
D.Magnetite
E.Ironite
The unit of diffusion coefficient is
A.metre second
B.metre second-1
C.metre2 second-1
D.metre-2 second-1
