| 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. | |
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