McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 1. |
The ability of material to absorb a large amount of energy is |
| A. | Malleability |
| B. | Resilience |
| C. | Toughness |
| D. | Ductility |
| E. | Hardness |
| Answer» C. Toughness | |
| 2. |
Porous materials generally |
| A. | Transmit sound |
| B. | Isentropic material |
| C. | Absorb most of the sound |
| D. | Reflect entire sound |
| Answer» C. Absorb most of the sound | |
| 3. |
A body which does not contain voids or empty spaces is known as |
| A. | Continuous body |
| B. | An isotropic body |
| C. | Heterogeneous body |
| D. | Crystalline body |
| E. | None of the above |
| Answer» A. Continuous body | |
| 4. |
Standards used in USSR are known as |
| A. | CSN |
| B. | AENOR |
| C. | GOST |
| D. | UNI |
| E. | JIS |
| Answer» C. GOST | |
| 5. |
A non-crystalline polymer which can be stretched to more than twice its original length and which contracts quickly on releasing the load, is known as |
| A. | copolymer |
| B. | dilatant |
| C. | plastic |
| D. | elastomer |
| E. | None of the above |
| Answer» D. elastomer | |
| 6. |
For better fuuidity of the molten metal, the following is added in blast furnace |
| A. | Line |
| B. | Carbon |
| C. | Sulphur |
| D. | Manganese |
| E. | Oil |
| Answer» D. Manganese | |
| 7. |
Lead is used for joining pipes made of |
| A. | Cast iron |
| B. | Cold iron steel |
| C. | Concrete |
| D. | Asbestos cement |
| E. | Vitrified clay |
| Answer» A. Cast iron | |
| 8. |
Laser is a device to produce |
| A. | Beam of white light |
| B. | Beam of monochromatic light |
| C. | Coherent light |
| D. | X-rays |
| E. | Microwaves |
| Answer» C. Coherent light | |
| 9. |
Which of the following has the highest malleability? |
| A. | Brass |
| B. | Cast iron |
| C. | Copper |
| D. | Aluminium |
| E. | Lead |
| Answer» E. Lead | |
| 10. |
Notches in a section produce |
| A. | Compressive stress |
| B. | Shear stresses |
| C. | Biaxial tensile stresses |
| D. | Tri-axial tensile stresses |
| E. | None of the above |
| Answer» D. Tri-axial tensile stresses | |
| 11. |
In induction hardening |
| A. | Only d.c. supply is used |
| B. | The power factor is high |
| C. | The voltage is high |
| D. | The frequency is high |
| E. | The current is high |
| Answer» D. The frequency is high | |
| 12. |
Burger's vector is |
| A. | estimation of force9 of substit9utional atoms |
| B. | a defect in crystall structure |
| C. | a property of dislocations |
| D. | None of the above |
| E. | None of the above |
| Answer» C. a property of dislocations | |
| 13. |
German silver is an alloy of |
| A. | Silver, gold and platinum |
| B. | Silver, copper and niclel |
| C. | Nickel, copper and zinc |
| D. | Silver with impurities below 1% |
| E. | Silver, copper and lead |
| Answer» C. Nickel, copper and zinc | |
| 14. |
The atomic number of a certain element is 83. An atom of this element must contain |
| A. | 42 protons and 41 electrons |
| B. | 83 neutrous |
| C. | 1 neutron, 41 electrons and 41 protons |
| D. | 83 electrons |
| E. | None of the above is valid |
| Answer» D. 83 electrons | |
| 15. |
The electrical resistance of a semi-conductor |
| A. | Increases with temperature |
| B. | Decreases with temperature |
| C. | Does not change with temperature |
| E. | None of the above |
| Answer» B. Decreases with temperature | |
| 16. |
Coolant is used on a lathe |
| A. | To cool the work piece |
| B. | To cool the tool |
| C. | To remove the chips |
| D. | All the above |
| E. | None of the above |
| Answer» D. All the above | |
| 17. |
Which one is different from the other in press work? |
| A. | Perforating |
| B. | Slitting |
| C. | Blanking |
| D. | Seaming |
| E. | Punching |
| Answer» D. Seaming | |
| 18. |
Hard steels and non-ferrous metal do not exhibit a definite yield point when pulled in the testing machine and for such cases a better measure of their elastic properties is defined by |
| A. | Yield point stress |
| B. | Yield point strain |
| C. | Proof stress |
| D. | Ultimate stress |
| E. | None of the above |
| Answer» C. Proof stress | |
| 19. |
If the major quantium number of an atom is three, it possesses |
| A. | Only s and p electrons |
| B. | Only s electrons |
| C. | Only s, p and d electrons |
| D. | Only p electrons |
| E. | None of the above is true |
| Answer» C. Only s, p and d electrons | |
| 20. |
In an one component system containing two phases, at equilibrium the number of degrees of freedom would be |
| A. | Infinite |
| B. | 2 |
| C. | 3 |
| D. | 1 |
| E. | 4 |
| Answer» D. 1 | |
| 21. |
The furnace used for castings of cast iron in a foundry shop is known as |
| A. | Electric induction furnace |
| B. | Muffle furnace |
| C. | Blast furnace |
| D. | Cupola |
| E. | Reverberatory furnace |
| Answer» D. Cupola | |
| 22. |
In fibre glass reinforced plastics, the glass fibres are primarily used to improve |
| A. | Mechanical properties of plastics |
| B. | Electrical properties of plastics |
| C. | Thermal properties of plastics |
| D. | Surface properties of plastics |
| E. | None of the above |
| Answer» A. Mechanical properties of plastics | |
| 23. |
Application of tin is in |
| A. | bulb filaments |
| B. | low current fuses |
| C. | transducers |
| D. | hair springs |
| E. | None of the above |
| Answer» B. low current fuses | |
| 24. |
The phenomenon of 'weld decay' is associated with |
| A. | Stainless steels |
| B. | Manganese steels |
| C. | Aluminium alloys |
| D. | Cast iron |
| E. | Brass |
| Answer» A. Stainless steels | |
| 25. |
German silver contains |
| A. | 5% silver |
| B. | 1% silver |
| C. | 10% silver |
| D. | No silver |
| E. | 0.1% silver |
| Answer» A. 5% silver | |
| 26. |
Which of the following is a composite material? |
| A. | Y-alloy |
| B. | High speed steel |
| C. | Tungsten carbide |
| D. | Fibre reinforced plastic |
| E. | None of the above |
| Answer» D. Fibre reinforced plastic | |
| 27. |
A material which undergoes no deformation till its yield point is reached and then it flows at a constant stress is known as |
| A. | Rigid plastic |
| B. | Elastic |
| C. | Rigid |
| D. | Plastic |
| E. | Elastic-plastic |
| Answer» A. Rigid plastic | |
| 28. |
In carbon steel castings |
| A. | The percentage of carbon is less than 1.7% |
| B. | The percentage of carbon is between 1.7% to 2% |
| C. | The percentage for alloying elements is controlled |
| D. | (A) and (C) above |
| E. | (B) and (C) above |
| Answer» A. The percentage of carbon is less than 1.7% | |
| 29. |
Nickel is used in |
| A. | cutting tools |
| B. | automatic voltage regulators |
| C. | electrodes of thermionic valves |
| D. | pressure sensitive elements |
| E. | None of the above |
| Answer» C. electrodes of thermionic valves | |
| 30. |
In order to improve machinability of steels, the treatment generally done is |
| A. | Cyniding |
| B. | Tempering |
| C. | Spheroidising |
| D. | Annealing |
| E. | Normalising |
| Answer» D. Annealing | |
| 31. |
Induction hardening is the process of |
| A. | Electrical hardening process |
| B. | Hardening surface for wear resistance |
| C. | Hardening the core |
| D. | Selective hardening |
| E. | Uniform hardening |
| Answer» B. Hardening surface for wear resistance | |
| 32. |
"Troosite" is obtained when |
| A. | Quenching steel during transformation |
| B. | A fully hardened steel is finally drawn at about 677?C |
| C. | Steel is rapidly quenched in oil |
| D. | When alloy steels are rapidly quenched in water |
| E. | None of the above |
| Answer» A. Quenching steel during transformation | |
| 33. |
The semi-conductors have electrical conductivities of the following order (ohm-cm-1) |
| A. | 10?20 |
| B. | 10?15 |
| C. | 10?3 |
| E. | None of the above |
| Answer» C. 10?3 | |
| 34. |
Cast iron containing 6.6% carbon is |
| A. | Black in colour containing only pearlite |
| B. | Black in colour containing only ferrite |
| C. | Gray in colour containing pearite and ferrite only |
| D. | Whitish containing cementite only |
| E. | None of the above |
| Answer» D. Whitish containing cementite only | |
| 35. |
The main alloy for corrosion resistance in stainless steel is |
| A. | Manganese |
| B. | Carbon |
| C. | Vanadium |
| D. | Cobalt |
| E. | Chromium |
| Answer» E. Chromium | |
| 36. |
A steel having ferrite and pearite is |
| A. | Soft |
| B. | Hard |
| C. | Ductile |
| D. | (A) and (B) above |
| E. | (A) and (C) above |
| Answer» A. Soft | |
| 37. |
Which variety of copper has the best mechanical strength? |
| A. | Annealed copper |
| B. | Hard drawn copper |
| C. | Cast copper |
| D. | Soft copper |
| E. | None of the above |
| Answer» B. Hard drawn copper | |
| 38. |
Brinell hardness number for nitrided steel is in the range |
| A. | 60 to 80 |
| B. | 100 to 150 |
| C. | 300 to 450 |
| D. | 700 to 800 |
| E. | 200 to 300 |
| Answer» D. 700 to 800 | |
| 39. |
Diamagnetic materials are |
| A. | Only slightly magnetised |
| B. | Strongly magnetised |
| C. | Magnetised with eddy currents only |
| D. | Magnetised in a direction opposite to that of the applied field |
| E. | None of the above |
| Answer» B. Strongly magnetised | |
| 40. |
Gamma iron has |
| A. | Body centred space lattice structure containing 6 atoms |
| B. | Body centred space lattice structure containing 10 atoms |
| C. | Face centred space lattice structure with 8 atoms |
| D. | Face centred space lattice structure with 14 atoms |
| E. | None of the above |
| Answer» D. Face centred space lattice structure with 14 atoms | |
| 41. |
Silicon steel is widely used in |
| A. | Chemical industry |
| B. | For cutting tools |
| C. | Electrical industry |
| D. | For making leaf prings |
| E. | For nuts and bolts |
| Answer» C. Electrical industry | |
| 42. |
Moh's scale of hardness has the range |
| A. | 10--15 |
| B. | 1--5 |
| C. | 1--3 |
| D. | 1--10 |
| E. | 5--10 |
| Answer» D. 1--10 | |
| 43. |
The tendency for brittle fracture increases with |
| A. | Increasing temperature |
| B. | Decreasing strain rate |
| C. | Appreciable plastic deformation before fracture |
| D. | Appreciable plastic deformation during propagation of the crack |
| E. | None of the above |
| Answer» E. None of the above | |
| 44. |
Preheating of material to be welded is necessary in case of |
| A. | Non-ferrous materials |
| B. | Cast iron |
| C. | Stainless steel |
| D. | Carbon steel |
| E. | High speed steel |
| Answer» B. Cast iron | |
| 45. |
Steel balls for ball bearings are generally made of |
| A. | Carbon chrome steel |
| B. | Stainless steel |
| C. | Cast steel |
| D. | Nodular cast iron |
| E. | Free carbon steel |
| Answer» A. Carbon chrome steel | |
| 46. |
The process of reheating the hardened steel to some temperature below the critical range, followed by any rate of cooling is known as |
| A. | Spheroidising |
| B. | Normalising |
| C. | Tempering |
| D. | Annealing |
| E. | Austempering |
| Answer» C. Tempering | |
| 47. |
Delta iron occurs at temperature in the range of |
| A. | Room temperature to 600?C |
| B. | 600?C to critical temperature |
| C. | Between 800?C and 1200?C |
| D. | Between 1400?C and 1530?C |
| E. | None of the above |
| Answer» D. Between 1400?C and 1530?C | |
| 48. |
Which process is used primarily to obtain surface finish |
| A. | Swaging |
| B. | Electroforming |
| C. | Shining |
| D. | Broaching |
| E. | Parkerizing |
| Answer» E. Parkerizing | |
| 49. |
In normalising steel is heated 40-50 C |
| A. | Above the upper transformation range |
| B. | Above the lower transformation range |
| C. | Below the lower transformation range |
| D. | Above room temperature |
| E. | Below the upper transformation range |
| Answer» A. Above the upper transformation range | |
| 50. |
Which of the following metals has high tendency to get work hardened? |
| A. | Lead |
| B. | Silver |
| C. | Brass |
| D. | Aluminium |
| E. | Copper |
| Answer» C. Brass | |
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