Old Questions on Diploma Mechanical Engineering

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Old Questions on Diploma Mechanical Engineering

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Diploma Mechanical Engineering Old Questions Paper

1. The locations of the atoms and their particular arrangement in a given crystal are described by means of
(a) intermolecular bond
(b) space lattice
(c) diffusion
(d) potential energy

2. Which of the following is a ceramic material?
(a) silicon carbide
(b) zinc
(c) iron
(d) wood

3. Which of the following tool materials is the hardest?
(a) ceramic tool
(b) high speed tool
(c) carbide tool
(d) diamond tools

4. Which of the following processes are heat treatment processes?
(a) Normalizing
(b) Annealing
(c) Quenching
(d) all of these

5. Silicon, when added to copper increases
(a) strength
(b) hardness
(c) strength and hardness
(d) strength and ductility

6. The process of introducing carbon into low carbon steel in order to produce a hard surface is known as
(a) Carbonitriding
(b) Carboaddition
(c) Cyaniding
(d) carburizing

7. The total number of atoms in body centred cubic (BCC) structure unit cell is
(a) 1
(b) 2
(c) 3
(d) 4

8. Delta iron occurs at temperature of
(a) room temperature
(b) around melting point
(c) between 1400ºC to 1539ºC
(d) between 910ºC to 1400ºC

9. Manganese in steel increases its
(a) ductility
(b) hardness
(c) fluidity
(d) tensile strength

10. The purpose of annealing is to
(a) induce stresses
(b) remove stresses
(c) harden surface
(d) none of these

11. Machining properties of steel are improved by adding
(a) phosphorous, lead and sulphur
(b) silicon, aluminium and titanium
(c) vanadium and aluminium
(d) chromium and nickel

12. Corrosion resistance of steel is increased by adding
(a) chromium and nickel
(b) nickel and molybdenum
(c) aluminium and zinc
(d) tungsten and sulphur

13. German Silver is an alloy of
(a) silver and some impurities
(b) nickel, copper and zinc
(c) refined silver
(d) silver and gold

14. Hardness of steel depends on
(a) amount of carbon it contains
(b) the shape and distribution of the carbide in iron
(c) contents of alloying elements
(d) none of these

15. Which of the following is preferred for welding of non-ferrous metals by arc welding?
(a) A.C. low frequency
(b) A.C. high frequency
(c) D.C.
(d) all of these

16. In four high rolling mill the bigger rollers are called
(a) guide rolls
(b) back up rolls
(c) main rolls
(d) support rolls

17. Gears are best mass produced by
(a) Milling
(b) Hobbing
(c) Shaping
(d) casting

18. Wax pattern is used in
(a) die casting
(b) investment casting
(c) shell moulding
(d) plaster moulds

19. Usually no cutting fluid is needed in turning
(a) low carbon steel
(b) alloy steel
(c) aluminium
(d) cast iron

20. Permeability of a moulding sand is increased with
(a) increasing the moisture content
(b) coarse grain size
(c) increasing the compact factor
(d) fine grain size

21. The most economical furnace to melt cast iron in large volume is
(a) reverberatory furnace
(b) cupola furnace
(c) induction furnace
(d) electric furnace

22. Which of the following is always a cold-working operation?
(a) Rolling
(b) wire drawing
(c) forging
(d) extrusion

23. The flame type that is normally used to weld copper base alloys in oxy-oxy-acetylene welding method is
(a) carburising flame
(b) neutral flame
(c) oxidising flame
(d) reducing flame

24. The cutting edges of a standard twist drill are called
(a) Flutes
(b) Lips
(c) Wedges
(d) flanks

25. For grinding steels, the preferred abrasive is
(a) silicon carbide
(b) aluminium oxide
(c) diamond
(d) cubic boron nitride

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26. A 3-jaw chuck is used in a lathe to clamp
(a) cylindrical work-piece to locate the axis of rotation
(b) eccentric work-piece to locate the axis of rotation
(c) square bar to locate the axis of rotation
(d) any type of work-piece to locate the axis of rotation

27. There is no electrode consumption for which of the following processes?
(a) TIG welding
(b) gas welding
(c) laser welding
(d) arc welding

28. The depth of cut depends upon
(a) tool life
(b) power required
(c) type of cut required
(d) all of these

29. Automobile bodies can be manufactured by employing
(a) rod drawing
(b) tube drawing
(c) wire drawing
(d) deep drawing

30. Which process is used for fine hole drilling and contour machining?
(a) EBM
(b) LBM
(c) ECM
(d) USM

31. The reason behind using non-traditional machining processes is to get
(a) high accuracy
(b) high strength
(c) good surface finish
(d) all of these

32. NC machine tools are operated by
(a) input-output module
(b) series of coded instructions
(c) feedback system
(d) close loop system

33. Which of the following is the basic tool in work study?
(a) process chart
(b) stop watch
(c) bar chart
(d) activity chart

34. If normal time is N, idle time is I and allowance is A, then standard time is equal to
(a) N+I+A
(b) N+I-A
(c) N-A
(d) N+A

35. The network analysis mainly based on events falls under the category of
(a) CPM
(b) PERT
(c) RAFT
(d) CAD

36. The simplex method is the basic method for
(a) queuing theory
(b) network analysis
(c) value analysis
(d) linear programming

37. Which of the following is not an inventory control technique?
(a) ABC analysis
(b) HML analysis
(c) VED analysis
(d) PQ analysis

38. Under economic order quantity (EOQ), the sum of cost of carrying and cost of ordering is
(a) Maximum
(b) Minimum
(c) Constant
(d) none of these

39. In a network analysis technique under project management, CPM is based on
(a) single time
(b) two times
(c) three times
(d) none of these

40. Which of the following are goals of JIT?
(a) increasing efficiency
(b) reducing wastage
(c) reducing lead time
(d) all of these

41. The performance of a specific task in CPM is known as
(a) Dummy
(b) Event
(c) Activity
(d) contract

42. Queuing theory is associated with
(a) Sales
(b) inspection time
(c) waiting time
(d) production time

43. The order in which different jobs are being taken up in a machine or process is called
(a) scheduling
(b) sequencing
(c) routing
(d) aggregate planning

44. Product layout is employed for
(a) batch production
(b) continuous production
(c) effective utilisation of machine
(d) all of these

45. Motion study involves analysis of
(a) actions of operator
(b) layout of work place
(c) tooling and equipment
(d) all of these

46. The micro-motion study was originated by
(a) F.W.Taylor
(b) Henri Fayol
(c) F.B. and L.M.Gilberth
(d) R.M.Barnes

47. The zone of feasible solution of an LPP is a
(a) rectangular set
(b) set of finite number of points
(c) concave set
(d) convex set

48. The stepping stone method in transportation problem is used to find
(a) a basic solution
(b) a feasible solution
(c) the initial basic feasible solution
(d) the optimal solution

49. Salvage value and service life of an equipment are
(a) based on first cost
(b) estimated on the basis of past experience
(c) fictitious values
(d) actual values

50. Depreciation of machines is considered as
(a) direct expense
(b) indirect expense
(c) direct material cost
(d) indirect material cost