McqMate
401. |
What are the disadvantages of PBM? |
A. | large power supplies |
B. | heat produced |
C. | toxic fumes produced |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: large power for more thick materials, production of heat and toxic fumes are some of the main disadvantages of pbm |
402. |
What is the full form of EBM in the advanced machining processes? |
A. | electro blast manufacturing |
B. | electron beam machining |
C. | electron beam manufacturing |
D. | electron blast manufacturing |
Answer» B. electron beam machining | |
Explanation: the full form of ebm is electron beam machining in the advanced machining processes. |
403. |
Which of the following are the applications of EBM process? |
A. | drilling |
B. | cutting |
C. | engraving |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: drilling small holes, cutting, engraving, and heat treatment are some of modern applications of electron beam machining. |
404. |
What are the values of currents used in EBM process? |
A. | 1 and 20 ma |
B. | 20 and 100 ma |
C. | 100 and 200 ma |
D. | 200 and 400 ma |
Answer» B. 20 and 100 ma | |
Explanation: the values of the currents used in the electron beam machining process are between 20 and 100 ma. |
405. |
What are the values of current densities used in the process of EBM? |
A. | 5 and 15 a/cm2 |
B. | 15 and 20 a/cm2 |
C. | 20 and 30 a/cm2 |
D. | 40 and 60 a/cm2 |
Answer» A. 5 and 15 a/cm2 | |
Explanation: the values of the current densities used in ebm lie between 5 and 15 a/cm2. |
406. |
Emission current depends up on which of the following factors? |
A. | cathode material |
B. | temperature |
C. | voltage supply |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: emission current depends on the cathode material, temperature, and the high voltage in the process of electron beam machining. |
407. |
What are the values of voltages used in the EBM process? |
A. | 10 v |
B. | 50 v |
C. | 150 v |
D. | 200 v |
Answer» C. 150 v | |
Explanation: the values of voltages used in the process of electron beam machining is about 150 v. |
408. |
Which of the following lenses are used for refocussing the electrons in EBM process? |
A. | magnetic lens |
B. | electronic lens |
C. | magnetic & electronic lens |
D. | none of the mentioned |
Answer» C. magnetic & electronic lens | |
Explanation: magnetic and electronic lenses are used to refocus the electrons in ebm process. |
409. |
What are the values of power densities used in the EBM process? |
A. | 0.05 mw/mm2 |
B. | 0.55 mw/mm2 |
C. | 1.55 mw/mm2 |
D. | 2.55 mw/mm2 |
Answer» C. 1.55 mw/mm2 | |
Explanation: the value of the power densities used in the process of electron beam machining are about 1.55 mw/mm2. |
410. |
What is the frequency of the pulse of electrons used in EBM process? |
A. | 10 hz |
B. | 102 hz |
C. | 103 hz |
D. | 104 hz |
Answer» D. 104 hz | |
Explanation: a pulsed electron beam at 104 hz reduces the temperature of the work piece outside the region being machined. |
411. |
What are the values of material removal rates in EBM process? |
A. | 1 mm3/min |
B. | 10 mm3/min |
C. | 100 mm3/min |
D. | 1000 mm3/min |
Answer» B. 10 mm3/min | |
Explanation: the values of the material removal rates in the process of electron beam machining are about 10 mm3/min. |
412. |
What are the values of the cavity diameters that are obtained in EBM? |
A. | 15 to 20 µm |
B. | 20 to 25 µm |
C. | 30 to 35 µm |
D. | 35 to 40 µm |
Answer» D. 35 to 40 µm | |
Explanation: the values of the cavity diameters range from 35 to 40 µm |
413. |
Which of the following are the applications of EBM? |
A. | hole drilling |
B. | slotting |
C. | perforation of thin sheets |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: drilling, perforation of thin sheets, slotting and integrated circuit fabrication are some of the applications of electron beam machining. |
414. |
What is the value of largest diameter of the hole drilled on EBM? |
A. | 0.5 mm |
B. | 1.0 mm |
C. | 1.5 mm |
D. | 2.0 mm |
Answer» C. 1.5 mm | |
Explanation: the maximum value of diameter that can be drilled using electron beam machining is about 1.5 mm. |
415. |
What is the value of maximum depth of the hole drilled on EBM? |
A. | 10 mm |
B. | 20 mm |
C. | 30 mm |
D. | 40 mm |
Answer» C. 30 mm | |
Explanation: value of the maximum depth that can be drilled using electron beam machining is about 10 mm. |
416. |
What is the value of energy required for bond breaking? |
A. | 10 to 20kv |
B. | 20 to 30kv |
C. | 30 to 40kv |
D. | 40 to 50kv |
Answer» A. 10 to 20kv | |
Explanation: value of the beam energy used for breaking bonds or cross linking them range from 10 to 20kv. |
417. |
1 and 16000 Hz in Electron beam machining. |
A. | ± 10 % |
B. | ± 20 % |
C. | ± 30 % |
D. | ± 40 % |
Answer» A. ± 10 % | |
Explanation: the tolerances obtained in electron beam machining is about ± 10 % of the depth of cut. |
418. |
Which of the following are the advantages of EBM process? |
A. | drilling rates |
B. | no distortion |
C. | high accuracy |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: the main advantages of electron beam machining are high drilling rates, no mechanical distortion, high accuracy and repeatability. |
419. |
There is no limitation imposed on which of the following factors in EBM? |
A. | material ductility |
B. | surface hardness |
C. | surface reflectivity |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: in electron beam machining, no limitation is imposed by work piece hardness, ductility, and surface reflectivity. |
420. |
How much is the capital equipment cost of equipment used in EBM? |
A. | very low cost |
B. | low cost |
C. | moderate cost |
D. | high cost |
Answer» D. high cost | |
Explanation: the capital equipment cost of the electron beam machining is high compared to other machining processes. |
421. |
How are the production times for a material in electron beam machining? |
A. | very small |
B. | small |
C. | moderate |
D. | long |
Answer» D. long | |
Explanation: in electron beam machining, long production times are required due to the generation of vacuum in the chamber for machining purpose. |
422. |
Which type of thin cast layer is produced when we use EBM? |
A. | thin layer |
B. | thick layer |
C. | no layer |
D. | all of the mentioned |
Answer» A. thin layer | |
Explanation: thin recast layer is produced in electron beam machining which an added disadvantage to the machining process |
423. |
In advanced machining processes, what is the full form of CHM? |
A. | chemical machining |
B. | chemical manufacturing |
C. | chemical milling |
D. | none of the mentioned |
Answer» C. chemical milling | |
Explanation: in advanced machining processes, full form of chm is chemical milling. |
424. |
Of the following, which mechanism is used for the removal of material using Chemical milling process? |
A. | material vaporization |
B. | chemical dissolution |
C. | mechanical erosion |
D. | mechanical abrasion |
Answer» B. chemical dissolution | |
Explanation: chemical dissolution takes place in chemical milling for the removing the material. |
425. |
Which of the following solutions cannot be used as chemical reactive solution in CHM? |
A. | acidic solution |
B. | alkaline solution |
C. | neutral solution |
D. | none of the mentioned |
Answer» C. neutral solution | |
Explanation: both acidic or alkane solutions are used for chemical dissolution in chemical milling. |
426. |
By using Chemical machining, which of the following can be produced? |
A. | pockets |
B. | contours |
C. | slots |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: by the use of chm, pockets, contours, slots and materials having high strength to weight ratio can be machined. |
427. |
Pre cleaning is done on the work piece surface in order to achieve, which of the following factors? |
A. | to provide good adhesion |
B. | to provide clean surface |
C. | to assure the absence of contaminants |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: all the factors mentioned above, are achieved thorough pre-cleaning process. |
428. |
Special coatings applied on work piece materials in order to protect them from chemical reaction are known as |
A. | maskants |
B. | protective coverings |
C. | protective varnishing |
D. | none of the mentioned |
Answer» A. maskants | |
Explanation: the protective coatings on work pieces are known as maskants. |
429. |
Type of mask depends on which of the factor/s, given below? |
A. | size of work piece |
B. | number of parts |
C. | desired resolution |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: all the factors mentioned above, are required to select the type of mask. |
430. |
During Chemical milling, depth of etch is controlled by which factor of immersion? |
A. | time |
B. | mask method |
C. | mask area |
D. | none of the mentioned |
Answer» A. time | |
Explanation: as the immersion time increases, depth of the etching increases. |
431. |
What is the range of reagent temperatures used for chemical dissolution in CHM? |
A. | 12ᵒc to 35ᵒc |
B. | 37ᵒc to 85ᵒc |
C. | 90ᵒc to 101ᵒc |
D. | 121ᵒc to 142ᵒc |
Answer» B. 37ᵒc to 85ᵒc | |
Explanation: the optimum temperature of reagent used should range between 37ᵒc to 85ᵒc. |
432. |
In Chemical milling, excessive flow of chemical reagent results in which of the following defects? |
A. | channellings |
B. | grooves |
C. | ridges |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: in chemical milling, if the reagent flows excessively, then the defects mentioned above may occur. |
433. |
State whether the following statement about Chemical milling is true or false. “At higher temperatures, faster etching rates occur in Chemical milling.” |
A. | true |
B. | false |
Answer» A. true | |
Explanation: as the temperature increases, reaction rate increases which in turn increases etching rate in chm. |
434. |
Of the following, which ratio defines the etch factor? |
A. | etching depth to undercut |
B. | undercut to etching depth |
C. | undercut to mask area |
D. | mask area to undercut |
Answer» B. undercut to etching depth | |
Explanation: etch factor is defined as the ratio of undercut to etching depth. |
435. |
CHM cannot eliminate which of the following defects? |
A. | irregularities and dents |
B. | surface scratches |
C. | waviness |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: chm is not a finishing process as that of maf, there are some sort of defects in chemical milling |
436. |
Which of the following are the tools required for Chemical milling? |
A. | maskants |
B. | etchants |
C. | scribing plates |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: all the components mentioned above, are required to carry out chemical milling process. |
437. |
State which of the following statement is true or false regarding Chemical milling. “Maskants are generally used in CHM, to protect the work piece from the etching chemical agent.” |
A. | true |
B. | false |
Answer» A. true | |
Explanation: in chm, maskants are used to protect the work piece from chemical agents. |
438. |
Which of the following are the materials used for making maskants? |
A. | synthetic materials |
B. | rubber materials |
C. | polymeric materials |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: all the materials mentioned above, can be used for making maskants. |
439. |
What are the properties that a maskant used in Chemical milling should possess? |
A. | be tough and adhere well |
B. | scribe easily |
C. | be inert to chemical reagent |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: all the properties mentioned above, should be possessed by the maskants. |
440. |
Which of the following can be used to apply the maskants on work piece in Chemical milling? |
A. | dipping or spraying |
B. | rolling or electro coating |
C. | adhesive tapes |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: maskants can be applied to work piece, by the above mentioned means. |
441. |
State whether the following statement is true or false regarding maskants. “After etching, maskants should be removed easily and inexpensively.” |
A. | true |
B. | false |
Answer» A. true | |
Explanation: after etching is done, maskants should be removed easily by inexpensive means. |
442. |
In maskant application, photo-resist masks ensure which of the following advantages? |
A. | high accuracy |
B. | ease of repetition |
C. | ease of modification |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: we will have the advantages which are mentioned above, if we use photo resist masking. |
443. |
Which of the following, are the main uses of etchants applied in Chemical milling? |
A. | good surface finish |
B. | uniform material removal |
C. | control intergranular attack |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: in chm, etchants are used for the above mentioned factors. |
444. |
State whether the following statement is true or false about etchants. “Etchants are used for controlling H2 absorption in case of Ti alloys.” |
A. | true |
B. | false |
Answer» A. true | |
Explanation: etchants control the h2 absorption in ti alloys. |
445. |
Scribing plates are used to define, which of the following parameters in Chemical milling? |
A. | areas to be exposed |
B. | volumes to be exposed |
C. | areas not to be exposed |
D. | volumes not to be exposed |
Answer» A. areas to be exposed | |
Explanation: scribing plates defines the areas that are to be exposed for removal of material. |
446. |
Which of the following are can be used as guides for scribing process in Chemical milling? |
A. | layout lines |
B. | simple templates |
C. | fibre glass |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: all the guides mentioned above, can be used for scribing process. |
447. |
Which of the following are the accessories, included in the tooling of Chemical milling? |
A. | tanks and hooks |
B. | brackets and racks |
C. | fixtures |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: the accessories mentioned above are included in the tooling of chemical milling. |
448. |
Which of the following come under process parameters of Chemical milling? |
A. | reagent type |
B. | concentration |
C. | operating temperature |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: all the parameters mentioned above, are different process parameters required for chemical milling. |
449. |
State whether the following statement is true or false about Chemical milling. “Maskants, applied on work pieces, are not responsible for CHM process.” |
A. | true |
B. | false |
Answer» B. false | |
Explanation: maskants are also responsible for process to take place in chemical milling. |
450. |
To machine high quality parts using CHM, which of the following need not be necessary? |
A. | heat treatment of work piece |
B. | grain size of work piece |
C. | frequency of vibrations |
D. | range of work pieces |
Answer» C. frequency of vibrations | |
Explanation: to machine high qualities products vibrational frequency is not necessary in chm. |
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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