McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 1. |
Non-Traditional machining is recommended when we need which of the following features? |
| A. | complex shapes |
| B. | high surface quality |
| C. | low-rigidity structures |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: for above requirements this machining is used. | |
| 2. |
Non-Traditional machining can also be called as |
| A. | contact machining |
| B. | non-contact machining |
| C. | partial contact machining |
| D. | half contact machining |
| Answer» B. non-contact machining | |
| Explanation: tool and work piece are at a distance apart in this type of machining. | |
| 3. |
In which of the following industries, Non-traditional machining methods play an important role? |
| A. | automobile |
| B. | aerospace |
| C. | medical |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: non-traditional methods are used widely in many industries. | |
| 4. |
Different classifications of Non-traditional machining based on source of energy are |
| A. | mechanical |
| B. | thermal |
| C. | chemical and electro-chemical. |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: it can be classified into the above mentioned categories. | |
| 5. |
In mechanical machining, material is removed by |
| A. | erosion |
| B. | corrosion |
| C. | abrasion |
| D. | vaporization |
| Answer» A. erosion | |
| Explanation: abrasive grains remove material by mechanical erosion in usm. | |
| 6. |
Material in thermal machining is removed by which of the following means? |
| A. | vaporization |
| B. | melting |
| C. | electro-plating |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: in this machining, heat is the source of energy. | |
| 7. |
Which of the following process comes under mechanical machining? |
| A. | usm |
| B. | edm |
| C. | lbm |
| D. | pam |
| Answer» A. usm | |
| Explanation: usm removes material by mechanical erosion. | |
| 8. |
Surface defects that may be occurred during thermal machining are |
| A. | micro cracking |
| B. | heat affected zones |
| C. | striations |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: during thermal machining surfaces defects occur. | |
| 9. |
Sources used in thermal machining are |
| A. | ions |
| B. | plasma |
| C. | electrons |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: different sources are used to remove the materials accordingly. | |
| 10. |
Vacuum is the machining medium for |
| A. | lbm |
| B. | wjm |
| C. | ebm |
| D. | none of the mentioned |
| Answer» A. lbm | |
| Explanation: vacuum is the medium for laser beam machining and ion beam machining. | |
| 11. |
In chemical machining is material removal takes by? |
| A. | chemical reaction |
| B. | erosion |
| C. | electron removal |
| D. | none of the mentioned |
| Answer» A. chemical reaction | |
| Explanation: chemical machining removes material by chemical reactions. | |
| 12. |
Which of the following is an example of hybrid machining? |
| A. | ultrasonic machining |
| B. | electron beam machining |
| C. | ultrasonic assisted electrochemical machining |
| D. | laser beam machining |
| Answer» C. ultrasonic assisted electrochemical machining | |
| Explanation: more than one phase is used to combine to form hybrid machining. | |
| 13. |
What is the full form of WJM in advanced machining processes? |
| A. | water jack manufacturing |
| B. | water jet machining |
| C. | water jet manufacturing |
| D. | water jack manufacturing |
| Answer» B. water jet machining | |
| Explanation: the full form of wjm is water jet machining in advanced machining processes. | |
| 14. |
What is the key element of water jet machining for material removal? |
| A. | tool holder |
| B. | work piece |
| C. | water jet |
| D. | power source |
| Answer» C. water jet | |
| Explanation: water jet is the one, which is used to cut the work piece and to remove material. | |
| 15. |
What is the velocity of water jet stream in water jet machining? |
| A. | 100 m/sec |
| B. | 300 m/sec |
| C. | 700 m/sec |
| D. | 900 m/sec |
| Answer» D. 900 m/sec | |
| Explanation: velocity of water jet stream that is used in water jet machining is about 900 m/sec. | |
| 16. |
Which of the following is not a part of machining system of Water jet machining? |
| A. | transducer |
| B. | accumulator |
| C. | jet cutting nozzle |
| D. | hydraulic pump |
| Answer» A. transducer | |
| Explanation: transducer is not a part of water jet machining and other components come under wjm | |
| 17. |
What is the general power rating of the hydraulic pump, used in WJM? |
| A. | 10 kw |
| B. | 20 kw |
| C. | 30 kw |
| D. | 40 kw |
| Answer» C. 30 kw | |
| Explanation: the power rating of the motor of hydraulic pump, which is used in wjm is about 30 kw. | |
| 18. |
Which of the following are the components of intensifier present in water jet machining system? |
| A. | piston |
| B. | plunger |
| C. | limit switch |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: the above mentioned components are present in the intensifier of water jet machining. | |
| 19. |
On which property of water, will the accumulator in Water jet machining rely on? |
| A. | density |
| B. | compressibility |
| C. | viscosity |
| D. | velocity |
| Answer» B. compressibility | |
| Explanation: accumulator relies on compressibility of water (12% at 3800bar), in order to maintain a uniform discharge pressure in wjm. | |
| 20. |
What are the values of typical tube diameters in the machining system in WJM? |
| A. | 0.1 to 1 mm |
| B. | 1 to 6 mm |
| C. | 6 to 14 mm |
| D. | 14 to 25 mm |
| Answer» C. 6 to 14 mm | |
| Explanation: typical tube diameter values range between 6 to 14 mm. | |
| 21. |
What is the expected life of the nozzles used in WJM? |
| A. | 10 hrs |
| B. | 20 hrs |
| C. | 100 hrs |
| D. | 200 hrs |
| Answer» D. 200 hrs | |
| Explanation: the life that is expected from the nozzle, which is a part of machining system, is 200 hrs. | |
| 22. |
Which of the following does not damage the nozzle used in Water jet machining? |
| A. | particles of dirt |
| B. | mineral deposits |
| C. | water |
| D. | all of the mentioned |
| Answer» C. water | |
| Explanation: only dirt particles and mineral deposits are responsible for damage of nozzle. | |
| 23. |
What are the uses of catcher in machining system of Water jet machining? |
| A. | collecting dirt |
| B. | collection of debris |
| C. | reduce noise levels |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: catcher in wjm is used to collect the dirt, machined debris and reduce the noise levels. | |
| 24. |
Distance between which components, is the stand-off distance? |
| A. | nozzle-inlet and work piece top |
| B. | nozzle-outlet and work piece-top |
| C. | nozzle-inlet and work piece-bottom |
| D. | nozzle-outlet and work piece-bottom |
| Answer» B. nozzle-outlet and work piece-top | |
| Explanation: stand-off distance is the distance between top of work piece and nozzle outlet. | |
| 25. |
10 – 0.30 mm. |
| A. | 0.1 – 1 mm |
| B. | 1 – 2 mm |
| C. | 2 – 6 mm |
| D. | 6 – 14 mm |
| Answer» C. 2 – 6 mm | |
| Explanation: stand-off distance value ranges between 2.5 – 6 mm in water jet machining. | |
| 26. |
8 – 25 mm. |
| A. | 0.0001 – 0.025 m/min |
| B. | 0.05 – 0.25 m/min |
| C. | 0.5 – 200 m/min |
| D. | 200 – 500 m/min |
| Answer» C. 0.5 – 200 m/min | |
| Explanation: in water jet machining, value of the feed rate ranges between 0.5 – 200 m/min. | |
| 27. |
In WJM, what are the properties of jet fluid that affect the MRR? |
| A. | velocity |
| B. | flow rate |
| C. | viscosity |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the mentioned properties above, of jet fluid affect the mrr in water jet machining. | |
| 28. |
Which of the following property/ies of nozzle does not affect the material removal rate in Water jet machining? |
| A. | material |
| B. | diameter |
| C. | outside temperature |
| D. | stand-off distance |
| Answer» C. outside temperature | |
| Explanation: in the nozzle, outside temperature has no effect on the rate of material removal. | |
| 29. |
In the following materials, Water jet machining can be used on which type of material? |
| A. | metals |
| B. | plastics |
| C. | ceramics |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: wjm can be used on metals, cloth, paper, plastics, food, leather, and ceramics. | |
| 30. |
What are the processes and applications, where Water jet machining can be used? |
| A. | cutting |
| B. | drilling |
| C. | deburring |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: water jet machining can be used for drilling, cutting, deburring, surface treatment and many more applications. | |
| 31. |
What is the tolerance limit range of thin materials in WJM? |
| A. | ± 0.1 mm |
| B. | ± 10 mm |
| C. | ± 25 mm |
| D. | ± 50 mm |
| Answer» C. ± 25 mm | |
| Explanation: in water jet machining, the range of tolerance is ± 25 mm. | |
| 32. |
In cutting of rocks using water jet machining, which type of pressure is needed? |
| A. | low pressure |
| B. | medium pressure |
| C. | high pressure |
| D. | none of the mentioned |
| Answer» C. high pressure | |
| Explanation: in wjm, very high pressures and velocities are needed while cutting rocks. | |
| 33. |
In deburring, which combination removes the material from non-metallic materials? |
| A. | high pressure and low flow rate |
| B. | high pressure and high flow rate |
| C. | low pressure and low flow rate |
| D. | low pressure and high flow rate |
| Answer» A. high pressure and low flow rate | |
| Explanation: for non-metallic materials high pressure and lower flow rates are used in deburring. | |
| 34. |
Which of the following materials has some drawbacks of cutting WJM? |
| A. | food |
| B. | rocks |
| C. | fibre-reinforced plastics |
| D. | none of the mentioned |
| Answer» C. fibre-reinforced plastics | |
| Explanation: water gets deflected due to the fibre embedded in the matrix of fibre- reinforced plastics when we use wjm. | |
| 35. |
In WJM, surface treatment includes which type of processes? |
| A. | removing deposits |
| B. | removing chemicals |
| C. | degreasing |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: surface treatment is done using wjm to clean the surface from many toxic chemical, deposits, residues etc | |
| 36. |
In how many directions, can the cutting takes place in Water jet machining? |
| A. | uni-directional |
| B. | bi-directional |
| C. | multi-directional |
| D. | none of the mentioned |
| Answer» C. multi-directional | |
| Explanation: water jet machining has multi directional cutting capacity i.e.., in any direction in three dimensional space. | |
| 37. |
In Water jet machining, cuts can be started at which place of workpiece? |
| A. | from left |
| B. | from right |
| C. | from middle |
| D. | from any point |
| Answer» D. from any point | |
| Explanation: in wjm, cuts can be started from any point on the workpiece. | |
| 38. |
Which of the following is not an advantage of Water jet machining? |
| A. | burr produced is minimal |
| B. | no heat is produced |
| C. | relatively low hourly rates |
| D. | environmentally safe |
| Answer» C. relatively low hourly rates | |
| Explanation: costs per hour are relatively high in water jet machining. | |
| 39. |
In Water jet machining, tool need not require sharpening once the machining is done. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: tool does not wear in water jet machining, so it need not be sharpened. | |
| 40. |
Which of the following secondary processes are eliminated in Water jet machining? |
| A. | grinding of surface |
| B. | surface treatment |
| C. | polishing of surface |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the mentioned secondary processes above, are eliminated in water jet machining. | |
| 41. |
How many parts are cut using Water jet machining, on a single blank? |
| A. | one part |
| B. | two parts |
| C. | three parts |
| D. | multiple parts |
| Answer» D. multiple parts | |
| Explanation: depending up on the kerf width, multiple parts can be machined using a single blank. | |
| 42. |
Which of the following is the disadvantage of water jet machining? |
| A. | narrow kerf width |
| B. | small diameter of nozzle |
| C. | not suitable for mass production |
| D. | burr is minimal |
| Answer» C. not suitable for mass production | |
| Explanation: due to high maintenance, wjm cannot be used for mass production. | |
| 43. |
. In advanced machining processes, what is the full form of AJM? |
| A. | automatic jet manufacturing |
| B. | abrasive jet machining |
| C. | automated jet machining |
| D. | abrasive jet manufacturing |
| Answer» B. abrasive jet machining | |
| Explanation: in advanced machining processes, full form of ajm is abrasive jet machining. | |
| 44. |
In AJM, which of the following materials are used as abrasive grains? |
| A. | al2o3 |
| B. | sic |
| C. | glass beads |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: in abrasive jet machining, any of the particles mentioned above can be used as abrasive grains. | |
| 45. |
In Abrasive jet machining, work piece material of removed by which of the following means? |
| A. | vaporization |
| B. | electro plating |
| C. | mechanical abrasion |
| D. | corrosion |
| Answer» C. mechanical abrasion | |
| Explanation: abrasive particles hit the surface with high pressure and high velocities, which removes the material. | |
| 46. |
Which type of materials can be machined using Abrasive jet machining? |
| A. | glass |
| B. | ceramics |
| C. | hard materials |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: materials like ceramics, glass, hard and super hard materials can be machined using abrasive jet machining. | |
| 47. |
In machining system of AJM, which is the medium of carrying the abrasive grains for machining? |
| A. | liquids |
| B. | gases |
| C. | any fluids |
| D. | none of the mentioned |
| Answer» B. gases | |
| Explanation: in ajm, different types of gases are used as the medium for carrying abrasives. | |
| 48. |
In machining system of AJM, what is/are the gas/es used for carrying the abrasives? |
| A. | co2 |
| B. | air |
| C. | nitrogen |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: in ajm, gases like co2, air or nitrogen are used to carry the abrasives. | |
| 49. |
What is the pressure of gas that is to be supplied, for carrying the abrasives? |
| A. | 0.1 to 1.0 kg/cm2 |
| B. | 2.0 to 8.0 kg /cm2 |
| C. | 10.0 to 18.0 kg/cm2 |
| D. | 25.0 to 35.5 kg/cm2 |
| Answer» B. 2.0 to 8.0 kg /cm2 | |
| Explanation: the pressure of the carrying gas should range between 2 to 8 kg/cm2. | |
| 50. |
Which of the following gas, should never be used as the carrier of abrasives? |
| A. | nitrogen |
| B. | co2 |
| C. | oxygen |
| D. | air |
| Answer» C. oxygen | |
| Explanation: oxygen should not be used as carrier because it causes a violent chemical reaction with abrasives or work piece. | |
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