MCQs
Total Questions : 350
| Page 8 of 35 pages
Answer: Option B. -> Phosphorous, lead and sulphur
Phosphorous, lead and sulphur improves machinability and resistance to corrosion and it intensifies the effects of other alloying elements
Phosphorous, lead and sulphur improves machinability and resistance to corrosion and it intensifies the effects of other alloying elements
Answer: Option B. -> Less than
When a steel containing less than 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.
When a steel containing less than 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.
Answer: Option C. -> Can cut another metal
Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion.
Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion.
Answer: Option D. -> All of these
When white iron is sheared, the fractured face appears white due to the absence of graphite.
The cementite microcrystalline structure is hard and brittle with a high compressive strength and good wear resistance.
In certain specialized applications, it is desirable to have white iron on the surface of the product.
This can be achieved by using a good conductor of heat to make part of the mold.
This will draw heat out of the molten metal quickly from that specific area, while the rest of the casting cools at a slower rate.
When white iron is sheared, the fractured face appears white due to the absence of graphite.
The cementite microcrystalline structure is hard and brittle with a high compressive strength and good wear resistance.
In certain specialized applications, it is desirable to have white iron on the surface of the product.
This can be achieved by using a good conductor of heat to make part of the mold.
This will draw heat out of the molten metal quickly from that specific area, while the rest of the casting cools at a slower rate.
Answer: Option B. -> Atomic packing factor
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called Atomic packing factor
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called Atomic packing factor
Answer: Option C. -> Nichrome
Chromium is a powerful alloying element in steel. Cr presents in certain structural steels in small amounts.
It is primarily used to increase hardenability of steel and increase the corrosion resistance as well as the yield strength of the steel material.
For that reason often occurs in combination with nickel and copper. Stainless steels may contain in excess of 12% chromium.
Chromium is a powerful alloying element in steel. Cr presents in certain structural steels in small amounts.
It is primarily used to increase hardenability of steel and increase the corrosion resistance as well as the yield strength of the steel material.
For that reason often occurs in combination with nickel and copper. Stainless steels may contain in excess of 12% chromium.
Answer: Option B. -> Sulphur
Sulfur is normally regarded as an impurity and has an adverse effect on impact properties when a steel is high in sulphur and low in manganese.
Sulphur improves machinability but lowers transverse ductility and notched impact toughness and has little effects on the longitudinal mechanical properties.
Sulfur is normally regarded as an impurity and has an adverse effect on impact properties when a steel is high in sulphur and low in manganese.
Sulphur improves machinability but lowers transverse ductility and notched impact toughness and has little effects on the longitudinal mechanical properties.
Answer: Option D. -> High carbon steel
An engineer's hammer is made of High carbon steel
An engineer's hammer is made of High carbon steel
Answer: Option C. -> 1200°C to 1300°C
In the lower part of the blast furnace (zone of fusion), the temperature is 1200°C to 1300°C
In the lower part of the blast furnace (zone of fusion), the temperature is 1200°C to 1300°C
Answer: Option D. -> Tempering
Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys
Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys
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