Janardan Rai Nagar Rajasthan Vidyapeeth 2007 Diploma Mechanical Engineering MANUFACTURING PROCESSES - Question Paper

DSM8 MANUFACTURING PROCESSES

Time : 3 hrs Maximum marks : 75

 

Instruction:

1. Question paper is divided into Group A, Group B and Group C

2. Each Group is 25 Marks

3. Figure to the right in bracket indicates marks.

4. Good Handwriting is expected

5. Assume suitable data if necessary.

 

Group A (25 Marks)

 

Answer any three questions (Question 1 is compulsory)

 

Q1. What are the various types and properties of plastics? (5)

Q2. Write short notes on (a) sweep pattern, (b) skeleton pattern, (c) match plate pattern,

(d) segmental pattern. (10)

Q.3 Draw the Lathe m/c and explain the parts of Lathe machine. (10)

Q.4 Write short notes on oxyacetylene welding. (10)

Q.5 Explain the following defects in casting.

(a) Swell (b) Fins & Flash (c) Sand wash (10)

 

Group B (25 Marks)

 

Answer any three questions (Questions 6 is compulsory)

Q.6 Discuss various types of moulding sands used in foundry ? (5)

Q.7 Write short notes on following : (10)

a. Briquetting b. Sintering

c. Hot pressing d. Sizing and coining

e. Infiltration f. Impregenation

Q.8 Write down objectives of pattern making. (10)

Q.9 Write down difference between Shaper and Planner. (10)

Q.10. Discuss the method of electric resistance welding. What are its advantages

and disadvantages? (10)

 

 

Group C (25 Marks)

All Questions are Compulsory.

 

Q.11 Fill in the blanks ( each question carry 2 marks)

                i)            The material used for coating the electrode is called __________.

              ii)            In sand moulding, the middle part of flask is called __________.

            iii)            The working of metal below their ________ temperature is

Known as cold working.

            iv)            In TIG welding, ________ electrode is used.

              v)            In shaper metal removal ________stroke.

 

Q.12 Multiple choices Question (Each question carries 2 marks)

1)      In straight polarity welding

a) electrode is connected to negative and work is positive.

b) electrode is connected to positive and work is negative.

c) work is positive and holder is essential.

d) work is negative and holder is essential.

2)      Which of the following is not a heat treatment process.

a)      Austempering

b)      Martempering

c)      Parkerizing

d)      Cyaniding

3)      Steel and Cast iron piper are cast by

a) Die casting.

b)       Centrifuging.

c)       True centrifugal casting.

d)       Investment casting.

4)      The Slowest speed in lathe is adopted for following operation

a)      normal turning

b)      thread cutting

c)      taper turning

d)      Knurling

5)      Lapping, horning etc. are following type of machining processes

a) high speed abrasive

b) medium speed abrasive

c) large material removal

d) low speed abrasive

 

Q.13 True or false (each question carry 1 marks).

1)      The sand is defined as the granular particles resulting from the breakdown of rocks.

2)      Polyethylene is a thermosetting plastic resin.

3)      In rolling operation, both rolls are rotates is opposite direction at different speed.

4)      The austempering is also known as isothermal quenching.

5)      Depth of cut is defined as the distance, which the tool advances for each resolution of the work.

 

 

 

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