Metallurgical microscope
Optical microscope
X-rays
Visual inspection by naked eye
✅ The correct answer is option D.
Engineering
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1972. Zinc is not used
For producing zinc base die casting alloys
In its oxide form as pigments
As anode for corrosion prevention in boiler
As an alloying element in various bronzes
✅ The correct answer is option D.
1973. Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of
Concrete
Steel
Zircalloy
Graphite
✅ The correct answer is option B.
1974. Dielectric strength of a material is
Its energy stroage capacity
A magnetic property
Its capacity to resist the flow of current
Its capacity to withstand high voltage
✅ The correct answer is option D.
1975. Trough of an apron conveyor is made of
Lead lined concrete vessel
Wood
Metal
Either B or C
✅ The correct answer is option D.
1976. Presence of silicon in steel
Is in the form of free Si
Indicates that steel is not deoxidised properly
Decreases the blow holes formation tendency in castings
None of these
✅ The correct answer is option C.
1977. Creep is not exhibited at low temperature by
Rubber
Acrylics
Lead
Plastics
✅ The correct answer is option C.
1978. Valves in pipe size of 2″ and under are normally made of
Wrought iron
Brass
Bronze
Monel
✅ The correct answer is option B.
1979. Constituents of stellite are
Zinc, copper and nickel
Cobalt, chromium and tungsten
Zinc, aluminium and nickel
Nickel, cobalt and vanadium
✅ The correct answer is option B.
1980. The main constituent of carborundum is __________ carbide.
Calcium
Silicon
Boron
Aluminium
✅ The correct answer is option B.