McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 1. |
Heating elements of electrical heaters are made of |
| A. | Nichrome |
| B. | Tungsten |
| C. | Invar |
| D. | Nicheloy |
| E. | Phosphor bronze |
| Answer» A. Nichrome | |
| 2. |
Which of the following element does not impart hardness to steel? |
| A. | Copper |
| B. | Nickel |
| C. | Silicon |
| D. | Chromium |
| E. | None of the above |
| Answer» A. Copper | |
| 3. |
The property which enables metals to be drawn into wire is known as |
| A. | Plastic deformation |
| B. | Ductility |
| C. | Malleability |
| D. | Elastic deformation |
| E. | Straining |
| Answer» B. Ductility | |
| 4. |
Endentor used in Vickers hardness testing machine is |
| A. | Diamond square-based pyramid |
| B. | 10 mm dia ball |
| C. | 15 mm dia ball |
| D. | 25 mm dia ball |
| E. | Conical indentor with 120? apex angle |
| Answer» A. Diamond square-based pyramid | |
| 5. |
When steel is made from phosphatic iron, it is likely to be |
| A. | Hard |
| B. | Ductile |
| C. | Brittle |
| D. | Tough |
| E. | Malleable |
| Answer» C. Brittle | |
| 6. |
Compressive strength is highest in case of |
| A. | Mild steel |
| B. | Wrought iron |
| C. | High carbon steel |
| D. | Cast iron |
| E. | Low carbon steel |
| Answer» C. High carbon steel | |
| 7. |
In nodular iron, graphite is present in the form of |
| A. | Powder |
| B. | Flakes |
| C. | Needles |
| D. | Spheroids |
| E. | Prisms |
| Answer» D. Spheroids | |
| 8. |
Which hardening process is generally not used for steels? |
| A. | Age hardening |
| B. | Pack carburising |
| C. | Induction hardening |
| D. | Nitriding |
| E. | Cyanidin |
| Answer» A. Age hardening | |
| 9. |
The flux used in brazing is usually |
| A. | Common salt |
| B. | Lime |
| C. | Borax |
| D. | Alum |
| E. | None of the above |
| Answer» C. Borax | |
| 10. |
The electrical conductivity of ferrites is |
| A. | Very high as compared to that of ferromagnetic materials |
| B. | Greater than that of ferromagnetic materials |
| C. | Equal to that of ferromagnetic materials |
| D. | Very low as compared to that of ferromagnetic materials |
| E. | Less than that of ferromagnetic materials |
| Answer» E. Less than that of ferromagnetic materials | |
| 11. |
For normalizing, steel is heated to |
| A. | 900?C |
| B. | 30?C to 60?C above critical temperature |
| C. | 700?C |
| D. | 100?C below critical temperature |
| E. | Critical temperature |
| Answer» B. 30?C to 60?C above critical temperature | |
| 12. |
Steel recommended for induction hardening should have |
| A. | Rough surface |
| B. | Fine grains |
| C. | Low electrical and thermal conductivity |
| D. | Coarse grains |
| E. | Low alloy content |
| Answer» B. Fine grains | |
| 13. |
Major constituent of phosphor bronze is |
| A. | Zinc |
| B. | Copper |
| C. | Phosphorous |
| D. | Aluminium |
| E. | Lead |
| Answer» B. Copper | |
| 14. |
Which of the following material is used for permanent magnets? |
| A. | Duralumin |
| B. | Elnivar |
| C. | Delta metal |
| D. | Invar |
| E. | Alnico |
| Answer» E. Alnico | |
| 15. |
If the steel at room temperature is magnetic, the presence of which constituent can be ruled out? |
| A. | Ferrite |
| B. | Pearlite |
| C. | Austenite |
| D. | Cementite |
| E. | None of the above |
| Answer» C. Austenite | |
| 16. |
Which of the following is usually made of high carbon steel? |
| A. | Channels |
| B. | Die blocks |
| C. | Hammers |
| D. | Solid drawn tubes |
| E. | Angle iron |
| Answer» C. Hammers | |
| 17. |
Nodular iron has low |
| A. | Melting point |
| B. | Tensile strength |
| C. | Fluidity |
| D. | Machinability |
| E. | Rapid heating |
| Answer» A. Melting point | |
| 18. |
In order to improve machinability of stainless steels |
| A. | 0.2 percent selenium is added |
| B. | 0.35 percent sulphur is added |
| C. | 0.5 percent manganese is added |
| D. | (A) and (B) above |
| E. | (B) or (C) above |
| Answer» D. (A) and (B) above | |
| 19. |
The unit of diffusion coefficient is |
| A. | metre second |
| B. | Presence of cementite |
| C. | metre2 second-1 |
| D. | metre second-1 |
| E. | metre-2 second-1 |
| Answer» E. metre-2 second-1 | |
| 20. |
The upper range of mercury thermometer can be increased by |
| A. | Filling the stem with nitrogen under pressure |
| B. | Increasing tube diameter |
| C. | Taking into account expansion of tube |
| D. | Range cannot be increased |
| E. | Providing steel tube |
| Answer» A. Filling the stem with nitrogen under pressure | |
| 21. |
The depth of hardening is affected by |
| A. | Size of specimen |
| B. | Hardenability of steel |
| C. | Quenching medium |
| D. | All of the above |
| E. | Low specific heat of quenching oil |
| Answer» D. All of the above | |
| 22. |
Monochromatic X-rays reflected from a calcite crystal (lattice constant ? = 3? ) give rise to first order Bragg reflection at 6.7?. The wavelength of these X-rays will be |
| A. | 7A |
| B. | 170 A |
| C. | 70 A |
| D. | 0.7 A |
| E. | 0.07 A |
| Answer» D. 0.7 A | |
| 23. |
During hardening soft spots can be avoided by |
| A. | using a more effective cooling medium |
| B. | protecting against decarburization in heating |
| C. | obtaining a more homogeneous structure employing annealing or normalising before hardening |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» D. Any of the above | |
| 24. |
Which of the following is high speed steel? |
| A. | T 55 Ni Cr 65 Mo 30 |
| B. | T 75 W 18 Co 6 Cr 4 |
| C. | T 10 Cr 5 Mo 75 V 23 |
| D. | T 75 W 18 Co 6 Cr 4 V 1 Mo 75 |
| E. | None of the above |
| Answer» D. T 75 W 18 Co 6 Cr 4 V 1 Mo 75 | |
| 25. |
Percentage of iron in pig iron approximately |
| A. | 95% |
| B. | 80% |
| C. | 90% |
| D. | 99.90% |
| E. | 78% |
| Answer» C. 90% | |
| 26. |
Silicon when added to copper increases its |
| A. | Brittleness |
| B. | Malleability |
| C. | Electrical conductivity |
| D. | Hardness |
| E. | Machinability |
| Answer» D. Hardness | |
| 27. |
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» A. flame hardening | |
| 28. |
Which of the following structure is least hard? |
| A. | Pearlite |
| B. | Presence of cementite |
| C. | Martensite |
| D. | Sorbite |
| E. | Troosite |
| Answer» A. Pearlite | |
| 29. |
Highest specific gravity is of |
| A. | Titanium |
| B. | Copper |
| C. | Lead |
| D. | Steel |
| E. | Brass |
| Answer» C. Lead | |
| 30. |
In which process steel is heated below the critical temperature |
| A. | Temperting |
| B. | Hardening |
| C. | Carburizing |
| D. | Annealing |
| E. | Normalizing |
| Answer» A. Temperting | |
| 31. |
Under identical values of cold and hot junction temperatures which thermocouple given the highest output |
| A. | Iron constantan |
| B. | All give equal output |
| C. | Nickel nimo |
| D. | Chromel-constantan |
| E. | Platinum-platinum-rhodium |
| Answer» D. Chromel-constantan | |
| 32. |
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» B. 0.035 percent | |
| 33. |
Which of the following material is not used for cyaniding? |
| A. | Sodium carbonate |
| B. | Sodium chloride |
| C. | Sodium hydroxide |
| D. | Sodium cyanide |
| E. | All of the above |
| Answer» C. Sodium hydroxide | |
| 34. |
The number of atoms per unit cell in BCC is |
| A. | 8 |
| B. | 9 |
| C. | 3 |
| D. | 6 |
| E. | 4 |
| Answer» B. 9 | |
| 35. |
As per IS code, C 65 steel will have carbon percentage of |
| A. | 0.065 percent |
| B. | 0.6 to 0.7 percent |
| C. | 6 to 7 percent |
| D. | 00 to 70 percent |
| E. | None of the above |
| Answer» B. 0.6 to 0.7 percent | |
| 36. |
Invar is an alloy of |
| A. | Iron and copper |
| B. | Iron and nickel |
| C. | Iron and chromium |
| D. | Iron and zinc |
| E. | Iron and vanadium |
| Answer» B. Iron and nickel | |
| 37. |
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» D. Any of the above | |
| 38. |
Which of the following furnaces is not used for non-ferrous materials |
| A. | Gas fired tilting furnace |
| B. | Pit furnace |
| C. | Cupola |
| D. | Crucible furnace |
| E. | Oil fired tilting furnace |
| Answer» C. Cupola | |
| 39. |
In order to observe the grain size of steel samples under microscope, the magnification should be the order of |
| A. | 2 |
| B. | 20 |
| C. | 1500 |
| D. | 100 |
| E. | 10 |
| Answer» D. 100 | |
| 40. |
For each ton of pig iron produced from blast furnace, the lime stone used is approximately |
| A. | 0.01 ton |
| B. | 0.4 tom |
| C. | 0.1 ton |
| D. | 1.4 ton |
| E. | 2.55 tons |
| Answer» B. 0.4 tom | |
| 41. |
Chilling, heat treatment and alloy addition to cast iron generally |
| A. | reduces machinability |
| B. | reduces carbon percentage |
| C. | reduces wear resistance |
| D. | improves machinability |
| E. | None of the above |
| Answer» A. reduces machinability | |
| 42. |
Manganese is added to steel primarily to increase |
| A. | Malleability |
| B. | Ductility |
| C. | Fatigue strength |
| D. | Endurance limit |
| E. | Tensile strength |
| Answer» E. Tensile strength | |
| 43. |
Just as strong is opposite of weak likewise elastic is opposite of |
| A. | Rigid |
| B. | Soft |
| C. | Ductile |
| D. | Inelastic |
| E. | Hard |
| Answer» A. Rigid | |
| 44. |
Which of the following temperatures represents the tempering temperature for C 30 steel? |
| A. | 1700?C |
| B. | 100-150?C |
| C. | 1400-1450?C |
| D. | 550-660?C |
| E. | 860-890?C |
| Answer» C. 1400-1450?C | |
| 45. |
Which thermocouple can measure the highest temperature? |
| A. | Tungsten- molybdenum |
| B. | Copper-constantan |
| C. | Chromel-alumel |
| D. | Iron constantan |
| E. | Platinum-rhodium |
| Answer» A. Tungsten- molybdenum | |
| 46. |
Which of the following is the softest material? |
| A. | Corundum |
| B. | Fluorite |
| C. | Diamond |
| D. | Quartz |
| E. | Calcite |
| Answer» E. Calcite | |
| 47. |
Which allotropic form of iron does not have body centred cubic lattice? |
| A. | Alpha iron |
| B. | Beta iron |
| C. | Gamma iron |
| D. | Delta iron |
| E. | All of the above |
| Answer» C. Gamma iron | |
| 48. |
All of the following are magnetic materials EXCEPT |
| A. | Cast iron |
| B. | Zinc |
| C. | Nickel |
| D. | Cobalt |
| E. | Iron |
| Answer» B. Zinc | |
| 49. |
Machinability of metal depends on |
| A. | Hardness |
| B. | Hardness and tensile strength |
| C. | Brittleness |
| D. | Brittleness and toughness |
| E. | None of the above |
| Answer» B. Hardness and tensile strength | |
| 50. |
Which of the following is not a constituent of Stellite? |
| A. | Cobalt |
| B. | Tungsten |
| C. | Ferrous |
| D. | Chromium |
| E. | All of the above |
| Answer» C. Ferrous | |
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