Practice Set on Diploma Mechanical Engineering

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Practice Set on Diploma Mechanical Engineering

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Diploma Mechanical Engineering Practice Set Paper

1. Which one of the following micro constituents has maximum hardness?
(a) Austenite
(b) Pearlite
(c) Sorbite
(d) Cementite

2. When _______ is added to, its tensile strength of steel can be increased by adding
(a) Chromium
(b) Manganese
(c) Magnesium
(d) Tungsten

3. Which one of the following is an alloy of copper and zinc?
(a) Brass
(b) Bronze
(c) Duralumin
(d) None of these

4. Examples of line defects are
(a) Vacancies
(b) Dislocations
(c) Twins
(d) Stacking faults

5. Which of the following elements does not impart hardness to steel?
(a) Copper
(b) Chromium
(c) Nickel
(d) silicon

6. Carbon steel is
(a) made by adding carbon in steel
(b) refined from cast iron
(c) an alloy of iron and carbon with variable quantities of phosphorus and sulphur
(d) extremely brittle

7. Which of the following is the most ductile material?
(a) mild steel
(b) copper
(c) zinc
(d) aluminium

8. Delta iron occurs at temperature of
(a) room temperature
(b) above melting point
(c) between 14000C and 15390C
(d) between 9100C and 14000C

9. Type of alloyed plain carbon steel used for drawing dies, punches and drills is
(a) high carbon steel
(b) medium carbon steel
(c) high speed steel
(d) none of these

10. Which one of the following is the cause of tool failure?
(a) excessive temperature
(b) excessive stress
(c) flank wear
(d) all of these

11. The angle obtained between the machined surface and underside of the tool is generally named as
(a) clearance angle
(b) relief angle
(c) edge angle
(d) nose angle

12. The tool life under oblique cutting in comparison to that of orthogonal cutting is
(a) Same
(b) Less
(c) More
(d) none of these

13. In which of the following welding processes is non-consumable electrode used?
(a) TIG welding
(b) LASER welding
(c) MIG welding
(d) plasma arc welding

14. In which of the following processes does electrode get consumed?
(a) TIG welding
(b) resistance welding
(c) thermit welding
(d) arc welding

15. Time required for non conventional machining in comparison to the conventional machining is
(a) Less
(b) Equal
(c) More
(d) unpredictable

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

17. The heating of pressed compact to below the melting temperature of any constituent of the product, or at least below the melting temperature of all principal constituents of the product is called
(a) Tempering
(b) Compacting
(c) Atomizing
(d) sintering

18. The material used for coating the electrode is called
(a) Flux
(b) Slag
(c) protective layer
(d) deoxidizer

19. A forming operation which is carried on cylindrical rolls is termed as
(a) Casting
(b) Drawing
(c) Rolling
(d) grinding

20. A model of casting which is constructed in such a way that it can be used for forming an impression in damp sand is defined as
(a) Molding
(b) Pattern
(c) damper
(d) prototype

21. In sand casting, draft allowance is added to
(a) All linear dimensions
(b) Only the interior dimensions
(c) Only the exterior dimensions
(d) Only to the dimensions that are perpendicular to the parting plane

22. Hot-chamber die-casting process is used for
(a) Aluminium
(b) Zinc
(c) Cast iron
(d) Steel

23. Drawing out is a forging operation used to
(a) reduce the cross section of a part
(b) increase the cross section of a part
(c) finish the part
(d) flatten the part

24. Filler metal is not required in the following type of welding process:
(a) Oxy-oxy-acetylene welding
(b) Arc welding
(c) Resistance welding
(d) Oxy-oxy- hydrogen welding

25. Consumable electrode for manual metal arc welding of steel is made of
(a) tungsten
(b) steel
(c) copper
(d) cadmium copper

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26. For gas welding of brasses, the most useful flame is:
(a) oxidizing flame
(b) reducing flame
(c) neutral flame
(d) no specific choice

27. Which of the following conditions does not favour the production of discontinuous chips?
(a) brittle material
(b) large chip thickness
(c) low cutting speed
(d) large rake angle

28. In grinding wheel a dense structure is required for:
(a) tough material
(b) ductile material
(c) heavy cuts
(d) finishing cut

29. The flexible manufacturing systems (FMS) is most suitable for a production system that falls under
(a) mass type
(b) batch type
(c) job type
(d) all of these

30. Margin of safety is generally expressed as
(a) ratio of budgeted sales to sales at BEP
(b) ratio of actual sales to sales at BEP
(c) percentage of budget to BEP
(d) all of these

31. The prime objective of value engineering is to minimize
(a) cost of production
(b) time of production
(c) cost of labor
(d) cost of value

32. In process chart, the symbol stands for the meaning of
(a) storage
(b) inspection
(c) delay
(d) transport

33. PERT is a network analysis mainly based on
(a) event oriented
(b) activity oriented
(c) process oriented
(d) none of these

34. The size of order which minimizes total cost of carrying and cost of ordering is called
(a) minimum order quantity
(b) economic order quantity
(c) safety order quantity
(d) re-order quantity

35. Which one of the following is not an attribute of the control chart?
(a) P chart
(b) R chart
(c) C chart
(d) np chart

36. The total cost of manufacturing a product is reduced due to
(a) standardization
(b) diversification
(c) simplification
(d) sophistication

37. Work study is concerned with
(a) improving present method and finding standard time
(b) motivation of workers
(c) improving production capability
(d) all of these

38. Scheduling gives information about
(a) when work should start and how much work should be completed in a certain period
(b) when work should completed
(c) how idle-time can be minimized
(d) proper utilization of machines

39. Product layout is employed for
(a) batch production
(b) continuous production
(c) effective utilization of machine
(d) none of these

40. Statistical quality control techniques are based on the theory of
(a) quality
(b) statistics
(c) probability
(d) all of these

41. An optimum project schedule implies
(a) optimum utilization of men, machines and materials
(b) lowest possible cost and shortest possible time for project
(c) timely execution of project
(d) to produce best results

42. Graphical method, simplex method and transposition method are concerned with
(a) break-even analysis
(b) value analysis
(c) linear programming
(d) inventory control

43. PERT has the following time estimate
(a) one time estimate
(b) two time estimate
(c) three time estimate
(d) four time estimate

44. Bar charts are suitable for
(a) minor works
(b) major works
(c) large projects
(d) all of these

45. A flow diagram drawn to scale must be given with
(a) outline process charts
(b) flow process charts
(c) multiple activity chart
(d) SIMO chart

46. The number of fundamental hand motion in micro-motion study are
(a) Thirteen
(b) Fifteen
(c) sixteen
(d) nineteen

47. Which one of the following is not a queing theory model?
(a) orders waiting to be processed
(b) machines waiting to be repaired
(c) machines in an assembly line to be operated
(d) batch of finished products waiting to be transported

48. The probability distribution of project completion time in PERT is
(a) Gaussian
(b) Gamma
(c) Beta
(d) binomial

49. Stoichiometric air–fuel ratio of petrol is roughly
(a) 50 : 1
(b) 25 : 1
(c) 15 : 1
(d) 1 : 1

50. In a two-stroke engine, one power stroke is obtained in
(a) one revolution of the crank shaft
(b) two revolutions of the crank shaft
(c) four revolutions of the crank shaft
(d) none of these