McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 451. |
The process parameters will have direct impact on which of the following factors? |
| A. | etch factor |
| B. | machining rate |
| C. | production tolerance |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, will have direct impact due to above process parameters. | |
| 452. |
Which of the following, are the general materials used for maskant application? |
| A. | neoprene |
| B. | poly vinyl chloride |
| C. | polyethylene |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the materials mentioned above, can be used as maskant materials. | |
| 453. |
On which of the following factors, MRR will not be depend on? |
| A. | chemical uniformity |
| B. | metallurgical uniformity |
| C. | frequency uniformity |
| D. | temperature uniformity |
| Answer» C. frequency uniformity | |
| Explanation: chemical milling is independent of frequency distribution. | |
| 454. |
Castings having a larger grain size, will show how much surface roughness value? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» D. high | |
| Explanation: in castings, as grain size increases, surface roughness increases. | |
| 455. |
Which of the following materials have the highest machining rate and best surface quality? |
| A. | rolled metal sheets |
| B. | thick metal plates |
| C. | polymeric plates |
| D. | plastic sheets |
| Answer» A. rolled metal sheets | |
| Explanation: rolled metal sheets will have highest machining rate and surface quality in chm. | |
| 456. |
For softer materials, which type of etching rates are obtained? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» B. low | |
| Explanation: in chemical milling, softer materials need low etching rates. | |
| 457. |
For harder materials, which of the following etching rates are obtained? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» D. high | |
| Explanation: in chemical milling, harder materials need higher etching rates. | |
| 458. |
State whether the following statement is true or false about etching rates. “As the etching rate increases, low surface roughness values occur.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: high etching rates result in low surface roughness values | |
| 459. |
Which of the following are necessary for best surface quality in Chemical milling? |
| A. | fine grain size and homogenous metallurgy |
| B. | coarse grain size and heterogeneous metallurgy |
| C. | fine grain size and heterogeneous metallurgy |
| D. | coarse grain size and homogenous metallurgy |
| Answer» A. fine grain size and homogenous metallurgy | |
| Explanation: in chm, for best surface quality, fine grain size and homogenous metallurgical work piece must be required. | |
| 460. |
Which of the following are the factors, on which, surface finish depends? |
| A. | grain size |
| B. | heat treatment |
| C. | induced stresses |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, are responsible for different qualities of surface finish. | |
| 461. |
State whether the following statement is true or false regarding surface finish in CHM. “The surfaces, which are machined using Chemical milling, will have regular lay pattern.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: in chm, surfaces do not have regular lay pattern. | |
| 462. |
Which of the following defects cannot be altered or eliminated using CHM? |
| A. | waviness |
| B. | surface imperfections |
| C. | scratches |
| D. | dents |
| Answer» B. surface imperfections | |
| Explanation: using chm, surface imperfections cannot be eliminated. | |
| 463. |
Which type of etching rate, mentioned below, produces low surface roughness? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» D. high | |
| Explanation: in chemical milling, high etching rate produces low surface roughness values and tolerances. | |
| 464. |
The depth of cut tolerances increases when machining depths at high machining rates. |
| A. | very smaller |
| B. | smaller |
| C. | medium |
| D. | larger |
| Answer» D. larger | |
| Explanation: in chemical milling, tolerance increases when machining depth increases. | |
| 465. |
What is the value of etching rate, which can be achieved using Chemical milling? |
| A. | 0.001 mm/min |
| B. | 0.025 mm/min |
| C. | 0.050 mm/min |
| D. | 0.075 mm/min |
| Answer» C. 0.050 mm/min | |
| Explanation: while we use chemical milling etch rates of around 0.025 mm/min are achieved. | |
| 466. |
What are the tolerance values achieved in Chemical milling, which depend on work piece material and depth of cut? |
| A. | ± 10% |
| B. | ± 20% |
| C. | ± 30% |
| D. | ± 40% |
| Answer» A. ± 10% | |
| Explanation: tolerances of ± 10% of cut width are achieved using chm. | |
| 467. |
For what value of machining depths, surface roughness sharply increases with depth of cut? |
| A. | <100 µm |
| B. | <200 µm |
| C. | <300 µm |
| D. | <400 µm |
| Answer» B. <200 µm | |
| Explanation: for material depths <200 µm, surface roughness increases with depth of cut. | |
| 468. |
What is the value of surface roughness, which is generally obtained using Chemical milling? |
| A. | 0.01 – 0.08 µm |
| B. | 0.1 – 0.8 µm |
| C. | 1 – 8 µm |
| D. | 10 – 80 µm |
| Answer» B. 0.1 – 0.8 µm | |
| Explanation: surface roughness obtained when general conditions are applied, is between 0.1 – 0.8 µm. | |
| 469. |
Which of the following can be easily removed using Chemical milling process? |
| A. | tio2 layer |
| B. | decarburized layer |
| C. | recast structure |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the layers mentioned above, can be removed using chemical milling. | |
| 470. |
What are the advantages when we use Chemical milling process? |
| A. | weight reduction |
| B. | no burrs |
| C. | no stresses |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the advantages mentioned above, can be obtained using chemical milling process. | |
| 471. |
Weight reduction is possible, on which type of contours? |
| A. | very simple |
| B. | simple |
| C. | complex |
| D. | none of the mentioned |
| Answer» C. complex | |
| Explanation: weight reduction can be possible using chemical milling, on complex contours, compared to conventional machining. | |
| 472. |
Simultaneous material removal using Chemical milling, results in which of the following? |
| A. | improves productivity |
| B. | reduces wrapping |
| C. | minimizing part distortion |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factor mentioned above occur, when we use chemical milling for material removal. | |
| 473. |
State whether the following statement is true or false regarding the advantages of CHM. “As there are no stresses induced, machining of delicate parts is possible.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: in chm, no stresses are induced, which makes machining of delicate parts easier. | |
| 474. |
Which type of taper can be achieved, using Chemical milling, on contours? |
| A. | discontinuous |
| B. | continuous |
| C. | periodic |
| D. | none of the mentioned |
| Answer» B. continuous | |
| Explanation: using chemical milling, a continuous taper, on contours can be achieved. | |
| 475. |
State whether the following statement is true or false regarding the advantages? “Capital cost of equipment, for machining large components, is relatively high.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: capital cost of equipment, is relatively low for machining large components. | |
| 476. |
Which of the following, are the other advantages of CHM? |
| A. | design changes |
| B. | less skilled operator |
| C. | minor tooling costs |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all of the advantages mentioned above, are obtained using chm. | |
| 477. |
Good surface quality and absence of burr eliminates which of the following? |
| A. | cutting operations |
| B. | finishing operations |
| C. | drilling operations |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| Explanation: absence of burrs and good surface quality eliminates finishing operations in chm. | |
| 478. |
State whether the following statement is true or false about advantages. “Extensive web areas and decorative finishes are not possible using CHM.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: decorative finishes are obtained when we use chm. | |
| 479. |
What are the values of scrap rates obtained in Chemical milling? |
| A. | 1% |
| B. | 3% |
| C. | 5% |
| D. | 7% |
| Answer» B. 3% | |
| Explanation: low scrapes rates around 3% are obtained when we use the chemical milling process | |
| 480. |
Which of the following are the limitations of Chemical milling process? |
| A. | disposal of chemicals |
| B. | limited scribing accuracy |
| C. | surface imperfections |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, are the limitations of chemical milling process. | |
| 481. |
What is the value of shallow cuts obtained on sheets and plates, when we use CHM? |
| A. | 3.83 mm |
| B. | 6.39 mm |
| C. | 12.27 mm |
| D. | 20.32 mm |
| Answer» C. 12.27 mm | |
| Explanation: very shallow depths of value 12.27 mm, are obtained when we use chm. | |
| 482. |
Hand masking, scribing and stripping can be difficult, due to which of the following factors? |
| A. | time consuming |
| B. | repetitive |
| C. | tedious |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, are main disadvantages for different processes in chm. | |
| 483. |
Which type of metallurgical surfaces are needed in Chemical milling process? |
| A. | homogenous |
| B. | heterogeneous |
| C. | mixture |
| D. | none of the mentioned |
| Answer» A. homogenous | |
| Explanation: metallurgic homogenous surfaces are needed for chemical milling to take place. | |
| 484. |
Porous castings yield, which type of surfaces in Chemical milling process? |
| A. | uniform surfaces |
| B. | even surfaces |
| C. | uneven surfaces |
| D. | none of the mentioned |
| Answer» C. uneven surfaces | |
| Explanation: as there are porous castings, there would be pores on the surface which lead to uneven surfaces. | |
| 485. |
State whether the following statement regarding the limitations of CHM. “Welded areas etch, at a rate that is same as base metal.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: welded areas etch at a different rate, when compared to that of base material. | |
| 486. |
Which of the following, indicate the accuracy of scribing by Chemical milling process? |
| A. | unlimited |
| B. | boundless |
| C. | infinite |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| Explanation: scribing accuracy is limited in chm process due to uneven surface finish. | |
| 487. |
Which of the following are the other limitations of Chemical milling process? |
| A. | hydrogen pickup |
| B. | intergranular attack |
| C. | complex designs becoming expensive |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: hydrogen pick up, intergranular attack are some other limitations in chemical milling process. | |
| 488. |
Which of the following is not a limitation of Chemical milling process? |
| A. | steep tapers not practical |
| B. | low scrap rates |
| C. | less scribing accuracy |
| D. | deep narrow cuts |
| Answer» B. low scrap rates | |
| Explanation: low scrap rates are possible in chemical milling, which is an advantage to the process | |
| 489. |
Which of the following metals can be machined using the Chemical milling process? |
| A. | copper |
| B. | zinc |
| C. | steel |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: zinc, copper, lead, and nickel are some of the metals that can be chemically machined. | |
| 490. |
Which of the following non-metallic materials can be machined using the Chemical milling process? |
| A. | plastics |
| B. | glass |
| C. | ceramics |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: non-metallic materials such as glass, ceramics and plastics can also be machined using chemical milling process. | |
| 491. |
Which of the following is the most popular application for weight reduction of aerospace components? |
| A. | shallow cuts |
| B. | deep cuts |
| C. | very deep cuts |
| D. | none of the mentioned |
| Answer» A. shallow cuts | |
| Explanation: shallow cuts in large thin sheets helps in reducing the weight, especially in aerospace industries. | |
| 492. |
How many designs can be machined from the same sheet in Chemical milling? |
| A. | only one |
| B. | two |
| C. | three |
| D. | multiple |
| Answer» D. multiple | |
| Explanation: in chemical milling, multiple designs can b machined on a large thin sheet depending upon the size of the designs. | |
| 493. |
CHM is used to thin out walls, web and ribs of parts that have been produces by which of the following processes? |
| A. | forging |
| B. | casting |
| C. | sheet metal forming |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: chm is used for applications mentioned above of the parts, which are formed by casting, forging and sheet metal forming processes. | |
| 494. |
Removal of sharp burrs come under which application of Chemical milling process? |
| A. | deep cuts |
| B. | multiple part machining |
| C. | improving surface characteristics |
| D. | none of the mentioned |
| Answer» C. improving surface characteristics | |
| Explanation: removal of sharp burrs improve the surface characteristics of parts machined using chemical milling. | |
| 495. |
Which of the following can be eliminated from the surfaces using Chemical milling? |
| A. | alpha case from ti-forgings |
| B. | decarburized layer from low cast alloys |
| C. | recast layer from machined parts |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: the defects on surfaces mentioned above, can be eliminated using chemical milling process. | |
| 496. |
CHM is used to remove the thin surfaces from forgings and castings, at which time of process? |
| A. | after penetration inspection |
| B. | prior to penetration inspection |
| C. | at the starting of process |
| D. | at the end of process |
| Answer» B. prior to penetration inspection | |
| Explanation: removal of thin surfaces from forgings and casting takes place, prior to penetration depth inspection. | |
| 497. |
State whether the following statement is true or false regarding the applications of CHM. “Removal of thin surfaces, prior to inspection, is done for detection of hidden defects.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: removal of thin surfaces is done to detect the hidden defects in surfaces using chm | |
| 498. |
In advanced machining processes, what is the full form of ECM? |
| A. | electrochemical manufacturing |
| B. | electrochemical milling |
| C. | electrochemical machining |
| D. | electrochemical masking |
| Answer» B. electrochemical milling | |
| Explanation: in advanced machining processes, full form of ecm is electrochemical machining. | |
| 499. |
In the following scientists, who was the one to introduce first patent on ECM? |
| A. | balamuth |
| B. | steve o flawer |
| C. | gusseff |
| D. | mcgeough |
| Answer» C. gusseff | |
| Explanation: gusseff was the one, who introduced the first patent on ecm in 1929. | |
| 500. |
Which of the following material removal mechanisms is implemented by ECM? |
| A. | mechanical abrasion |
| B. | electrochemical dissolution |
| C. | chemical corrosion |
| D. | mechanical erosion |
| Answer» B. electrochemical dissolution | |
| Explanation: in ecm, material is removed by electrochemical dissolution. | |
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