2. Shrinkage allowance does not depend on which of the following factor?
Correct : D. amount of finish required
3. The size of the sand particles in the molding sand is the biggest.
Correct : A. true
4. The is responsible for the impact strength in the molding sand.
Correct : A. aggregates
5. The property ensures the removal of excess sand in the mould box.
Correct : A. adhesiveness
6. Binding property of the sand increases because of the property.
Correct : A. cohesiveness
7. Which of the following is the most important property of the molding sand in cores?
Correct : C. collapsibility
8. Electric arc furnaces are most suitable for which of the following type of material?
Correct : A. ferrous
9. There is no direct contact of flame and metal in which of the following type of furnace?
Correct : B. crucible
10. In an induction furnace, mixing and melting rates are altered by?
Correct : C. controlling power and frequency of current only
11. The machine used to mix shell mould particles consistently is
Correct : C. mueller
12. Cores used in PMC are usually made up of?
Correct : D. all of the mentioned
13. Hollow casting is the other name of which of the following special casting process?
Correct : A. slush casting
14. Pressure range for low pressure die casting is
Correct : A. 0.3-1.5 bars
15. Dry sand cores may be required for the provision of spigot at the end section of the casting.
Correct : A. true
16. Which of the following parts is provided in between the mould and casing to reduce the vibrations?
Correct : B. metallic roller
17. In centrifugal casting, the casting yield is approximately equaled to 100%.
Correct : A. true
18. It is also possible to make un-symmetric shape of casting in true centrifugal casting by introducing some variations to the mould.
Correct : B. false
19. Castings made by the centrifugal casting process have negligible porosity.
Correct : A. true
20. Which of the following types of centrifugal casting process is used for the casting, whose shape of casting is not axi- symmetric?
Correct : C. centrifuging
21. Co2 moulding is mainly used for the increase in strength and hardness of the moulds and cores.
Correct : A. true
22. Continuous passing of Co2 through the mould can decrease the strength of mould and results in a weak mould.
Correct : B. false
23. Additives can be used for the non-ferrous application to avoid the poor collapsibility of the mould.
Correct : B. false
24. Sometimes over-gassing can cause the sticking of pattern to the mould in Co2 moulding.
Correct : A. true
25. The rotor of a three phase induction motor can never attain synchronous speed.
Correct : A. true
26. A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. How a three phase induction motor operates when rotor frequency is greater than stator frequency?
Correct : A. rotor will be driven against rmf
27. A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. How a three phase induction motor operates when rotor frequency is less than stator frequency?
Correct : D. all of the mentioned
28. A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. Then the rotor emf E2 and the rotor current I2 are zero at
Correct : A. ns
29. Consider a situation in which a welding operation is being performed with V = 20 volts, I = 200 A, and the cross-sectional area of the weld bead is 30 mm2. Estimate the welding speed if the workpiece and electrode are made of (a) aluminum, (b) carbon steel, and (c) titanium. Use an efficiency of 75%.
Correct : B. 34.5 mm/s
30. In arc welding, arc is created between the electrode and work by?
Correct : D. electrical energy
31. The coating material used for the electrode is termed as?
Correct : A. flux
32. Which of the following welding process in which two pieces to be joined are overlapped and placed between two pointed electrodes?
Correct : D. spot welding
33. In which of the following type of flame, oxygen is of same proportion with acetylene?
Correct : A. neutral flame
34. If the open circuit voltage is 60 volt and the short circuit current is 20 amperes. Then determine the voltage required for welding if the current required during welding is 10 amperes?
Correct : A. 30 v
35. How does the arc voltage V depends upon the length of arc L?
Correct : A. v = f(l)
36. What is the only difference between Plasma arc welding and TIG welding?
Correct : B. construction of torch is different
37. In plasma arc welding the gas is?
Correct : A. ionized
38. If the total efficiency is 0.35 in arc welding. Then what is the welding speed in mm/sec if the cross-sectional area is 5mm2, welding power is 2 kW and the heat required in melting the metal is 100 J/mm3.
Correct : A. 1.4
39. Which of the following inert gas is used with DC power supply only?
Correct : C. co2
40. Which kind of resistance is experienced in upset butt welding?
Correct : A. electric resistance
41. How are the metals to be welded connected to each other in spot welding?
Correct : C. mechanical pressure
42. Up to what thickness, can steel be welded using spot welding process?
Correct : C. 12 mm
43. In flash butt welding, the forced out metal is called flash.
Correct : A. true
44. In friction welding process, materials are joined by motion between materials.
Correct : B. rubbing
45. All metallic engineering materials which are can be friction welded.
Correct : C. forgeable
46. Friction welding is process.
Correct : B. cost saving
47. Friction welding produces quality joints, with a 100% weld.
Correct : C. butt joint
48. In inertia friction welding energy of welding machine is used.
Correct : C. rotational
49. In inertia friction welding, one workpiece is connected to
Correct : A. flywheel
50. Which of the following defects occur when weld metal layer fails to fuse together?
Correct : C. incomplete fusion
51. Which of the following defects occur due to melting or burning away of base metal?
Correct : A. undercut
52. Forging is a metal forming operation in which the metal is stretched to form the desired shape of a metal part.
Correct : B. false
53. In general, the casted metal part is much stronger and tougher than that produced by the forging operation.
Correct : B. false
54. The open die forging process is also known as upsetting or upset forging process.
Correct : A. true
55. Which of the following processes is mainly used for making the connecting rods?
Correct : D. forging
56. In impression die forging process, extra deformed material is produced which is called a flash.
Correct : A. true
57. A cone shaped die is used in the orbital forging for the forging of metal parts.
Correct : A. true
58. When an asymmetrical section is roll formed, the finished product will have
Correct : C. a twist
59. Which of the following is true about the extrusion process?
Correct : B. no time is lost in changing the shape
60. In which extrusion process the direction of flow of metal is in same direction as that of ram?
Correct : A. direct
61. Which of the following is not used because of the problem of handling extruded metal coming out through moving ram?
Correct : B. indirect
62. Which of the following is not a cold extrusion process?
Correct : C. hydrostatic extrusion
63. The centre of the extruded product can develop cracks called as?
Correct : D. all of the mentioned
64. Which of the following processes of metal forming is best suited for making products like aircraft wings and window frames?
Correct : D. stretch forming
65. Stretch forming is a process which involves tensile and bending forces during the operation.
Correct : A. true
66. Forming is a process that changes the shape of the metal by changing its phase.
Correct : B. false
67. Rolling is a forming process in which thickness of the metal plate is decreased by increasing its length.
Correct : A. true
68. In stretch forming, spring-back is a very complicated problem which causes trouble in operating machines during the process.
Correct : B. false
69. 3 WORKING PRINCIPLE AND APPLICATIONS - HYDRO FORMING - RUBBER PAD FORMING - METAL SPINNING
Correct : D. stretch forming
70. High volume rate of production can be possible by stretch sheet metal forming process.
Correct : B. false
71. Tangential stretch forming and simple stretch forming are quite similar to each other.
Correct : B. false
72. In electromagnetic forming, highly intense magnetic field is used for the forming process.
Correct : A. true
73. The magnetic field interacts with metal to generate heat in the metal which causes forming process.
Correct : B. false
74. Electromagnetic forming cannot be used for materials of poor electrical conductivity.
Correct : B. false
75. The efficiency of electromagnetic forming mainly depends on the resistivity of material being formed.
Correct : A. true
76. The joints made by an electromagnetic forming process are much stronger than the parent material.
Correct : A. true
77. What is the minimum pressure required in a compression molding process?
Correct : A. 0.5 mpa
78. What is the minimum curing time required in a compression molding process?
Correct : B. 0.5 minutes
79. What is the maximum pressure required in a transfer molding process?
Correct : C. 100 mpa
80. Thermosetting materials are the polymeric materials which get soften on heating with or without pressure.
Correct : B. false
81. Polyurethanes plastics can be made in flexible foams even after belonging to thermosetting polymers.
Correct : A. true
82. Thermosetting plastics like epoxies can be used for filament wound rocket motor casings in missiles by combining with glass fibers.
Correct : A. true
83. Mechanical properties of any plastics are mainly dependent on the temperature, force and time of load applied.
Correct : A. true
84. Where does the granular molding material get loaded into?
Correct : B. hopper
85. There is a varied pressure provided in the solidification unit of injection molding process.
Correct : B. false
86. Which of the following is not an application of blow molding process?
Correct : B. door liners
87. The heater in the vacuum forming process is heated up to 90°C.