Machine Drawing-short Answer Questions

8/10/2019 Machine Drawing-short Answer Questions

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Machine drawing3RD SEMESTER M ECHANICAL E NGINEERING

Short Answer QuestionsWrite an !" #uestion$

1. What is the difference between engineering drawing and artistic drawing?2. Explain with a simple sketch the aligned system of dimensioning.3. Explain unidirectional system of dimensioning.4. What is meant by progressi e dimensioning and continuous dimensioning?!. "how by suitable diagrams a system of#

$a% chain dimensioning$b% &arallel dimensioning

'. (raw different types of lines used in machine drawing). (raw machining symbol for surface remo al.*. "how arious methods of dimensioning a circle.+. Explain with the help of suitable sketches the method of dimensioning $i% ,rcs

and $ii% ,ngles.1-. What is the importance of sectioning?11. Why sectional iews are used in drawings?12. ow do you hatch if there are more than two ad/acent parts?13. (raw the con entional representation of glass and wood14. ow the tolerances are specified and indicated on drawing?1!. 0i e arious types of fits with symbols.1'. What is the difference between allowance and clearance?1). What do u mean by ransition fit?1*. ow will u indicate machining allowance?1+. What is the difference between allowance and tolerance?

2-. What does u mean by basic si e?21. What is meant by max material condition?22. "ketch with fig. illustrating$i% pper and lower de iation$ii% asic si e and ero line23. Explain $i% olerance $ii% 0o and 5o 0o limits.24. Explain the following terms with neat sketches#

a. clearance

b. interference2!. Explain unilateral and bilateral tolerance?2'. What are left handed and right handed screw thread.2). (raw any thread with nomenclature2*. Where s6uare threads are preferred?2+. Explain with neat sketch dimensioning of screw thread.3-. 7ake a free hand sketch of a 2! mm diameter8 standard hexagon9headed bolt8

with nut and washer. he length of the bolt is 1!-mm31. (efine the terms# depth of thread8 pitch8 lead8 slope8 flank8 thread angle8 crest root

and axis of thread.32. What are multi9start threads? Where these are used and why?33. ow will you represent double start8 right hand :;< thread?34. What is the necessity of con entional representation of screw threads?


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3!. 7ake a sketch of the profile of8 $a% Whit9Worth screw thread and $b% .". nifiedthread form.

3'. "ketch neatly any two types of triangular threads. "tate the angle of the threads ineach case and dimension the depth8 assuming pitch of 1-mm.

3). What is the con entional method of representing pipe threads $=nternal and external%.

3*. 5ame the arious types of s6uare threads.3+. "how by sketch8 con entional method of showing s6uare thread nominal diameter 2-mm and pitch 3mm.

4-. What are the ad antages of welded /oints o er ri eted /oints?41. What are the ad antages of weld /oints?42. (raw any fi e symbols of welding /oints.43. What are the arious types of welding?44. "how by sketches how the si e of a weld is gi en.4!. "ketch the symbol to indicate weld all round?4'. Explain the basic symbol for single and double > utt welds..4). What are the permanent and temporary fastenings? 0i e examples.

4*. What is the difference between a lap and butt ri eted /oints?4+. What is welding and what type of fastening it is?!-. What are the fundamental types of welded /oints?!1. Why the edges of the welded /oints are prepared?!2. (raw the 9sectional representation and symbol of single ;9 utt and single

utt /oint.!3. "ketch neatly8 taking any suitable proportions8 the following welded /oints#

a. butt /oint b. lap /ointc. tee /ointd. corner /ointe. edge /oint

!4. "ketch two iews of a single ri eted butt /oint8 with two co er plates8 for +mm thick plates

!!. "ketch freehand at least four types of ri et heads and gi e their proportions. akediameter for ri ets as 2!mm.

!'. "ketch two iews of a single ri eted lap /oint for 1'mm thick plates.!). What is the purpose of caulking and fullering of ri et /oint?.!*. What are the ad antages of pro iding protecti e flange?!+. nder what circumstances cotter /oints are commonly used.'-. What is the function of clearances in cotter /oint?'1. @ompare the use of keys with the use of cotters and illustrate your answer by

sketching an example of each8 when used to fasten parts together '2. 5ame arious boiler mountings.'3. What is the function of an eccentric in an engine?'4. ow is the blow off cock operated?'!. What is the function of a bush in a bearing?''. What are the arious type of bearing? "how them by simple diagram?'). ow the axial mo ement of brass is pre ented in case of a &lummer block.


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'*. What is the function of connecting rod in =@ engines? (raw a simple sketch toshow big end and small end of the connecting rod?

'+. Why brasses are used in connecting rod ends and why are these are made of softmetal?

)-. What is a blow9off cock and where it is used?

)1. What is the ad antage of pro iding bush in bearing? What is the material of the bush?)2. Write applications of couplings.)3. Why are split muff >coupling used in preference to solid muff coupling?)4. What is the specific use of an expansion pipe /oint?)!. What are the functions of steam stop al e?)'. What is a flexible coupling? What are its ad antages?)). Explain the benefits of assembly of parts by using @,(?)*. Why a gib is used in combination with a cotter?)+. What are the uses of a &lummer block?*-. What are the ad antages of &lummer block o er closed and open bearing?

*1. (ifferentiate between boiler mountings and accessories.*2. @lassify arious types of couplings.*3. 5ame three kinds of rigid shaft couplings? "tate why they are called ArigidB?*4. What is the ad antage of Cldham

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Machine Drawing-short Answer Questions