MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Ferrite is |
| A. | Low specific heat of quenching oil |
| B. | Present in abundance in high carbon steel |
| C. | Soft and ductile |
| D. | Hardenable under rapid cooling |
| E. | Amorphous and brittle |
| Answer» D. Hardenable under rapid cooling | |
| 2. |
The maximum temperature inside a blast furnace gas is of the order of |
| A. | 2600?C |
| B. | 1000?C |
| C. | 1600?C |
| D. | 50?C |
| E. | 3600?C |
| Answer» D. 50?C | |
| 3. |
Which colour of flame represents the highest temperature? |
| A. | Dark red |
| B. | Pink |
| C. | White |
| D. | Light yellow |
| E. | Bright red |
| Answer» D. Light yellow | |
| 4. |
Free cutting steels usually have sulphur content of |
| A. | 0.02 percent |
| B. | 0.21 percent |
| C. | 2 percent |
| D. | 10 percent |
| E. | 0.002 percent |
| Answer» C. 2 percent | |
| 5. |
In tool steel the sulphur content is usually not allowed to exceed |
| A. | 3.5 percent |
| B. | 0.035 percent |
| C. | 5 percent |
| D. | 0.001 percent |
| E. | 0.35 percent |
| Answer» C. 5 percent | |
| 6. |
Spherical metal powders are usually produced by |
| A. | Milling |
| B. | Electrolytic process |
| C. | Oxidation |
| D. | Automization |
| E. | Reduction |
| Answer» E. Reduction | |
| 7. |
Which of the following materials are usually most ductile? |
| A. | Amorphous |
| B. | Face centred cubic lattice |
| C. | Non-metallic |
| D. | Body centred lattice |
| E. | Hexagonal close-packed lattice |
| Answer» C. Non-metallic | |
| 8. |
Which of the following is usually made of dead mild steel? |
| A. | Flanges |
| B. | Shafts |
| C. | Spades |
| D. | Gears |
| E. | Fish plates |
| Answer» B. Shafts | |
| 9. |
The flux used in blast furnace while melting iron ore is |
| A. | Bauxite |
| B. | Carbon |
| C. | Oxygen |
| D. | Sodium chloride |
| E. | Lime stone |
| Answer» F. | |
| 10. |
Galvanising layer usually provides protection in the range of water |
| A. | 7 to 14 |
| B. | Complete protection is provided |
| C. | 1 to 7 |
| D. | 1 to 14 |
| E. | 6 to 11 |
| Answer» F. | |
| 11. |
Which colour of heat represents the highest temperature? |
| A. | Low specific heat of quenching oil |
| B. | White |
| C. | Salmon |
| D. | Dry cherry |
| E. | Blood red |
| Answer» C. Salmon | |
| 12. |
Persence of lead in brass improves |
| A. | Malleability |
| B. | Hardenability |
| C. | Ductility |
| D. | Fatigue resistance |
| E. | Machining properties |
| Answer» F. | |
| 13. |
If an article develops insufficient hardening after quenching it could be due to any of the following EXCEPT |
| A. | Internal stresses in the article before heating |
| B. | Low specific heat of quenching oil |
| C. | Cooling rate too slow |
| D. | Holding insufficient at the hardening temperature |
| E. | Hardening temperature too low |
| Answer» B. Low specific heat of quenching oil | |
| 14. |
Eutectoid steel has a structure of |
| A. | Martensite |
| B. | Bainite |
| C. | Sorbite |
| D. | Nickel |
| E. | A combination of all above |
| Answer» E. A combination of all above | |
| 15. |
Dilute nitric acid applied to a clean fracture of wrought iron gives |
| A. | Grey stain |
| B. | Greenish stain |
| C. | White stain |
| D. | Blue stain |
| E. | Black stain |
| Answer» D. Blue stain | |
| 16. |
Which of the following metal does not have face centred cubic structure? |
| A. | Nickel |
| B. | Tin |
| C. | Lead |
| D. | Copper |
| E. | Silver |
| Answer» C. Lead | |
| 17. |
Which thermocouple can measure the highest temperature? |
| A. | Tungsten- molybdenum |
| B. | Copper-constantan |
| C. | Chromel-alumel |
| D. | Iron constantan |
| E. | Platinum-rhodium |
| Answer» B. Copper-constantan | |
| 18. |
Which of the following can be used as fuel in open hearth furnace? |
| A. | Liquid fuels |
| B. | Coke oven gas |
| C. | Producer gas |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» E. Low specific heat of quenching oil | |
| 19. |
Attack of steel is increased by |
| A. | Salt solution below a paint coat |
| B. | Invisible moisture film present prior to painting |
| C. | Graphite in the priming coat |
| D. | Loose rust and partially removed mill scale |
| E. | All of the above |
| Answer» F. | |
| 20. |
The rollers of a cycle chain are subjected to |
| A. | Shear stress |
| B. | Tensile stress |
| C. | Creep stress |
| D. | Fatigue stress |
| E. | Compressive stress |
| Answer» E. Compressive stress | |
| 21. |
Which of the following gives granular fracture? |
| A. | Steel |
| B. | Wrought iron |
| C. | Cast iron |
| D. | All of the above |
| E. | None of the above |
| Answer» B. Wrought iron | |
| 22. |
Local hardening of steel can be done by all of the following EXCEPT |
| A. | flame hardening |
| B. | stepped uniform heating |
| C. | resistance heating |
| D. | Low specific heat of quenching oil |
| E. | induction hardening |
| Answer» B. stepped uniform heating | |
| 23. |
The depth of hardness in steel can be increased by the addition of |
| A. | Vanadium |
| B. | Chormium |
| C. | Tungsten |
| D. | Sulphur |
| E. | Nickel |
| Answer» C. Tungsten | |
| 24. |
Pure iron has the structure of |
| A. | Ferrite |
| B. | Pearlite and austenite |
| C. | Pearlite |
| D. | Austenite |
| E. | Pearlite, austenite and ferrite |
| Answer» B. Pearlite and austenite | |
| 25. |
In a diamagnetic material the effect of an applied magnetic field is that |
| A. | A net dipole moment is induced in the material |
| B. | There is a net reduction in flux density |
| C. | The induced magnetism is in opposition to applied field |
| D. | All of the above |
| E. | None of the above |
| Answer» E. None of the above | |
| 26. |
Which of the following affects the hardenability of steel? |
| A. | Austenitic composition |
| B. | Austenitic grain size |
| C. | Amount, nature and distribution of undissolved or insoluble particles in austenite |
| D. | All of the above |
| E. | Low specific heat of quenching oil |
| Answer» E. Low specific heat of quenching oil | |
| 27. |
For acid resistance cast iron should have silicon percentage of |
| A. | 1 percent |
| B. | 15 percent |
| C. | 10 percent |
| D. | 25 percent |
| E. | 2 percent |
| Answer» C. 10 percent | |
| 28. |
A solder consists of |
| A. | Tin and antimony |
| B. | Tin and white metal |
| C. | Lead and tin |
| D. | Zinc and lead |
| E. | Zinc and tin |
| Answer» D. Zinc and lead | |
| 29. |
The highest rate of quenching is possible in |
| A. | Cold furnace |
| B. | Oil |
| C. | Air |
| D. | Water |
| E. | Hot furnace |
| Answer» E. Hot furnace | |
| 30. |
During first charge in cupola the time taken by material to melt is approximately |
| A. | 2 |
| B. | 5 to 6 hours |
| C. | 10 minutes |
| D. | 1 hour |
| E. | Half an hour |
| Answer» B. 5 to 6 hours | |
| 31. |
An instrument which is used for measuring temperature variations by change in a metallic resistance is called a |
| A. | thermo-generator |
| B. | Thermo-galvanometer |
| C. | Thennocouple |
| D. | Thermopile |
| E. | Bolometer |
| Answer» F. | |
| 32. |
Ultimate tensile strength is least in case of |
| A. | Cast iron |
| B. | Mild steel |
| C. | Wrought iron |
| D. | High carbon steel |
| E. | Low carbon steel |
| Answer» B. Mild steel | |
| 33. |
The crystal structure of alpha iron is |
| A. | BCC |
| B. | FCC |
| C. | HCC |
| D. | Cubic |
| E. | None of the above |
| Answer» B. FCC | |
| 34. |
During heat treatment the formation of thick layer of scale on the surface of steel articles is mainly due to |
| A. | oxidation |
| B. | excessive hardness |
| C. | Low specific heat of quenching oil |
| D. | coarse grain structure |
| E. | reduction |
| Answer» B. excessive hardness | |
| 35. |
In tool steel the percentage of silicon is usually restricted to |
| A. | 1 percent |
| B. | 2 percent |
| C. | 0.5 percent |
| D. | 0.2 percent |
| E. | 5 percent |
| Answer» E. 5 percent | |
| 36. |
Normal mercury thermometer can be used upto |
| A. | 300?C |
| B. | 500?C |
| C. | 100?C |
| D. | 800?C |
| E. | 212?C |
| Answer» B. 500?C | |
| 37. |
A hardness value of 1400 BHN can be expected in case of |
| A. | Cementite |
| B. | Ferrite |
| C. | Pearlite |
| D. | All of the above |
| E. | None of the above |
| Answer» B. Ferrite | |
| 38. |
The hardness obtained by hardening process does not depend upon |
| A. | Carbon content |
| B. | Work size |
| C. | Atmospheric temperature |
| D. | Quenching rate |
| E. | None of the above |
| Answer» D. Quenching rate | |
| 39. |
The percentage of sulphur in steel can be reduced by adding |
| A. | Copper |
| B. | Chormium |
| C. | Magnesium |
| D. | Manganese |
| E. | Zinc |
| Answer» E. Zinc | |
| 40. |
Which of the following material does not have hexagonal close packed structure? |
| A. | Alpha iron |
| B. | Zinc |
| C. | Magnesium |
| D. | Cadmium |
| E. | Titanium |
| Answer» B. Zinc | |
| 41. |
Which metal has the lowest melting point? |
| A. | Aluminium |
| B. | Copper |
| C. | Iron |
| D. | Magnesium |
| E. | Silver |
| Answer» D. Magnesium | |
| 42. |
The process used for making steel is |
| A. | Bessemer converter |
| B. | Open hearth |
| C. | Electric arc |
| D. | High frequency heating |
| E. | Any of the above |
| Answer» F. | |
| 43. |
Petrol engine carburetors are manufactured by |
| A. | Die casting |
| B. | Lost wax casting |
| C. | Sand casting |
| D. | Centrifugal casting |
| E. | Shell casting |
| Answer» B. Lost wax casting | |
| 44. |
Which of the following gives a fracture crystalline in appearance? |
| A. | Steel |
| B. | Wrought iron |
| C. | Cast iron |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 45. |
Modulus of elasticity for steel is approximately |
| A. | 52 x 106 kg/cm2 |
| B. | 1.2 x 106 kg/cm2 |
| C. | 12 x 106 kg/cm2 |
| D. | 2 x 106 kg/cm2 |
| E. | 78 x 106 kg/cm2 |
| Answer» E. 78 x 106 kg/cm2 | |
| 46. |
Highest melting point is for |
| A. | Cast iron |
| B. | Wrought iron |
| C. | Low carbon steel |
| D. | Mild steel |
| E. | High carbon steel |
| Answer» C. Low carbon steel | |
| 47. |
Formation of thick layer of scale on the surface of steel articles can be minimised by |
| A. | heating in furnaces with reducing neutral or protective atmosphere |
| B. | heating in boxes with used carburising agent or cast iron chips |
| C. | heating in molten salt bath |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» E. Low specific heat of quenching oil | |
| 48. |
The operation that usually follwos hardening is |
| A. | Tempering |
| B. | Normalising |
| C. | Annealing |
| D. | Carburising |
| E. | Cyaniding |
| Answer» C. Annealing | |
| 49. |
The principle on which a disappearing filamment type pyrometer works is known as |
| A. | Wien's law |
| B. | Peltier effect |
| C. | Kirchhoff's law |
| D. | Seeback effect |
| E. | Fourier's law |
| Answer» B. Peltier effect | |
| 50. |
On Moh's scale, materials with hardness number less than 4 are |
| A. | Topaz, Corundum, Diamond |
| B. | Hardened and tempered |
| C. | Felspar, corundum, Diamond |
| D. | Fluorite, Felsper, Talc |
| E. | Talc, gypsum, calcite |
| Answer» F. | |