The material used in the filament of electric bulbs is_________________?
A. Nichrome
B. Tungsten
C. Constantan
D. German silver
Materials and Construction
Constituents of stellite are__________________?
Constituents of stellite are__________________?
A. Zinc, copper and nickel
B. Cobalt, chromium and tungsten
C. Zinc, aluminium and nickel
D. Nickel, cobalt and vanadium
The phenomenon in which slow extension of material takes place with the time at constant load is called________________?
The phenomenon in which slow extension of material takes place with the time at constant load is called________________?
A. Plasticity
B. Creep
C. Elasticity
D. Ductility
Sherardizing process is used for__________________?
Sherardizing process is used for__________________?
A. Surface coating
B. Heat treatment of high speed steel
C. Cold working on metals
D. None of these
Graphite is a good________________?
Graphite is a good________________?
A. Thermal & electrical insulator
B. Conductor of heat
C. Conductor of electricity
D. Both B. & C.
Iron rust is_________________?
Iron rust is_________________?
A. Ferrous oxide
B. Hydrated ferric oxide
C. Powdered iron
D. Ferric sulphide
Glass lined vessels are not used for handling/storing__________________?
Glass lined vessels are not used for handling/storing__________________?
A. Dilute H2SO4
B. Dilute HNO3
C. Dilute HCl
D. Hydrofluoric acid
A material is able to retain the deformation permanently by virtue of its___________________?
A material is able to retain the deformation permanently by virtue of its___________________?
A. Elasticity
B. Plasticity
C. Ductility
D. Malleability
Fatigue failure of a material results from ______________ stress?
Fatigue failure of a material results from ______________ stress?
A. Tensile
B. Compressive
C. Fluctuating
D. None of these
Fatigue failure of a material results from _____________ stress?
Fatigue failure of a material results from _____________ stress?
A. Tensile
B. Compressive
C. Fluctuating
D. None of these