Steel balls for ball bearings are hardened to
A.100 VPN
B.150-200 VPN
C.200-400 VPN
D.400-700 VPN
E.700-800 VPN
Category: Engineering Materials Mcqs
Visco-elastic behaviour is common in
A.Crystalline materials
B.Non-crystalline solids
C.Non-crystalline organic polymers
D.Plastics
E.Rubber
The specific gravity of cast iron is closer to
A.3
B.5
C.7
D.9
E.11
Which of the following can have positive or negative charge?
A.Electron
B.Iron
C.Hole
D.Neutron
E.Isotope
Limestone is added in blast furnace to flux
A.Silicon xoide
B.Carbon
C.MnO2
D.Sulphur
E.None of the above
The properties of cast iron are regulated by
A.The composition of raw material
B.Heating temperature
C.Heat treatment
D.Percentage of carbon present
E.Control of amount, type, size and distribution of various carbon formations
Age hardening is generally applicable to
A.Cast iron
B.Medium carbon steels
C.High alloy steels
D.Alloys of aluminium, magnesium, nickel etc
E.Alloys of chromium, vanadium etc
Thermoplastic and thermoset polymers differ in
A.Glass transition temperature
B.Thermal behaviour
C.Mechanical behaviour
D.All of the above
Cadmium sulphide cell is a
A.Photo conductive cell
B.Solar cell
C.Photovoltaic cell
D.Thermocouple
E.Photo emissive cell
Which of the following alloy does not contain tin?
A.Gun metal
B.Phosphor bronze
C.Fusible plug material
D.White metal
E.All of the above
