1. A pattern is generally made up of how many pieces?
Correct : B. 2-3
2. How does pattern vary in size with casting?
Correct : A. pattern is larger in size
3. A pattern carries which allowance for internal and external surfaces?
Correct : D. draft allowance
4. What is draft allowance also known as?
Correct : C. taper allowance
5. Machining allowance does not depend on which of the following factor?
Correct : A. solidifying contraction
6. How much does the distortion allowance vary?
Correct : B. 2mm to 20mm
7. Ferrous metals need more allowance than non-ferrous metals.
Correct : A. true
8. A pattern is shaken by striking it with a wooden piece. A negative allowance is provided for this. Which allowance is it?
Correct : B. rapping allowance
9. The following figure depicts which allowance?
Correct : C. draft allowance
10. Which of the following is not used for the formation of the molding sand?
Correct : D. coal
11. The is responsible for the impact strength in the molding sand.
Correct : A. aggregates
12. Molding sand can withstand chemical reactions on it and prove it to be beneficial for the casting formation.
Correct : B. false
13. The property ensures the removal of excess sand in the mould box.
Correct : A. adhesiveness
14. Binding property of the sand increases because of the property.
Correct : A. cohesiveness
15. The adhesiveness and cohesiveness are the same properties of the molding sand.
Correct : B. false
16. Flow ability increases with increase in the green strength.
Correct : A. true
17. For melting of cast iron, which of the following furnace is used?
Correct : B. cupola furnace
18. Why is sand bed prepared for melting of metal in Cupola furnace?
Correct : A. it provides a refractory bottom
19. What is the function of slag hole in a cupola furnace?
Correct : A. to tap the slag generated
20. Incoming air pressure and quantity in cupola furnace are controlled by which of the following element?
Correct : C. wind box
21. Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace?
Correct : D. limestone
22. Which of the following metal has a melting point of about 1537oC and latent heat of fusion 65.0 cal/g?
Correct : D. iron
23. What is hearth in a furnace?
Correct : C. the bowl shaped bottom of the furnace
24. Why are flux added to the charge ( parent metal to be melted) during melting of a metal?
Correct : D. to remove specific oxides
25. Which of the following is/are the advantage(s) of an Induction Furnace?
Correct : D. all of the mentioned
26. Which of the following metal has a melting point of about 420oC and latent heat of fusion 26.3 cal/g?
Correct : C. zinc
27. Which of the following metal has a melting point of about 660oC and latent heat of fusion 92.7 cal/g?
Correct : A. aluminium
28. Gas-Fired burner is used in which of the following furnace?
Correct : B. reverberatory furnace
29. What is inoculation of cast iron?
Correct : B. addition of silicon alloys
30. Why is inoculation done certain times during melting of cast iron?
Correct : A. to enhance its mechanical properties
31. Which of the following is/are not used to melt material in casting(foundry) industries?
Correct : C. ladle furnace
32. Which type of sand is used in shell moulding?
Correct : C. dry and fine sand
33. Which is the most widely used resin in shell moulding?
Correct : A. phenol formaldehyde
34. Which of the following statement is true?
Correct : C. the size of the casting obtained by shell moulding is limited
35. Cylinder and cylinder heads for air cooled IC engines are casted using which technique?
Correct : B. shell moulding
36. In precision investment casting, to make the mould the prepared pattern is dipped into a slurry. From which material is this slurry is made up of?
Correct : C. both ethyl and sodium silicate
37. Another name of Gravity Die Casting is?
Correct : B. permanent mould casting
38. In PIC, any wax remnants are dissolved with the help of hot vapors of a solvent. Which solvent is used for this purpose?
Correct : C. trichloroethylene
39. Which of the following is a limitation of die casting, but is overcome in vacuum die casting?
Correct : A. the air left in the cavity when the die is closed
40. Pattern used in shell moulding is normally made up of?
Correct : B. metal
41. The casting process that does not require a core to produce a hollow casting is?
Correct : C. permanent mould casting
42. Squeeze casting method was developed in which country?
Correct : D. russia
43. The tundish is a
Correct : A. pouring vessel
44. Which of the type of centrifugal casting methods is used to produce ‘non- symmetrical’ shaped castings?
Correct : C. centrifuging
45. True centrifugal casting method is usually used to make
Correct : B. hollow pipes
46. Which of the following forces provides continuous pressure on the metal in centrifugal casting?
Correct : B. centrifugal force
47. Which of the following methods of casting is best suited for casting of hollow pipes and tubes?
Correct : D. centrifugal casting
48. 5 CENTRIFUGAL CASTING
Correct : B. false
49. The axis of rotation of the mould should be horizontal for the casting of long pipes in centrifugal casting.
Correct : A. true
50. In centrifugal casting, only sand moulds can be used due to the problem of sticking of metal.
Correct : B. false
51. In centrifugal casting, a movable pouring basin is employed for the pouring of molten metal.
Correct : A. true
52. The speed of rotation is almost double in semi centrifugal casting as compared to the true centrifugal casting.
Correct : B. false
53. Which of the following moulds or moulding is also known as sodium silicate process.
Correct : D. co2 moulding
54. How much percentage of sodium silicate (Na2SiO3) is added to the sand mixture in Co2 moulding?
Correct : B. 2 to 6 %
55. How much time (in a minute) is usually required for the passing of Co2 through the mould?
Correct : A. one
56. It is very safe to use Co2 in Co2 moulding, so it eliminates the use of any shielding apparatus.
Correct : A. true
57. Which of the following additives are added to the sand in Co2 moulding for the improvement in collapsibility of the sand?
Correct : C. aluminium oxide
58. Co2 moulding process is an ideal process, where speed and flexibility is the prime requirement.
Correct : A. true
59. Moisture from the mould can be removed by using of dryer or heater in Co2 moulding.
Correct : B. false
60. Co2 moulding is a kind of sand moulding, but it is not economical than the green sand moulding.
Correct : A. true
61. Which of the following defect is not a gas defect?
Correct : C. run out
62. Which gas defect is caused by hydrogen in molten metal?
Correct : D. pin hole porosity
63. Cuts, washes, swell, drop etc. are the examples of which of the following casting defects?
Correct : C. moulding material defect
64. When the molten metal leaks out of mould which defect occurs?
Correct : A. run out
65. The lower fluidity of molten material causes
Correct : C. misrun & cold shut
66. Defects caused by the chilling of the casting are known as?
Correct : A. hot spots
67. During melting process flux is added to react with impurities to form?
Correct : B. slag
68. Which defect is caused due to the conversion of moisture to steam because of the heat of molten metal?
Correct : A. blow holes
69. Defect which occurs due to the solidification of casting is known as?
Correct : D. shrinkage cavity
70. The direction of rmf when a single phase supply is given to stator of three phase induction motor is?
Correct : A. zero
71. The direction of rmf when a three phase supply is given to stator of three phase induction motor is?
Correct : B. ns
72. Two three phase induction motors A and B are identical in all respects except that motor A has a larger air-gap than motor B. Which motor will have more no load current?
Correct : A. a
73. Two three phase induction motors A and B are identical in all respects except that motor A has a larger air-gap than motor B. Which motor will have poorer power factor?
Correct : A. a
74. Two three phase induction motors A and B are identical in all respects except that motor A has a larger air-gap than motor B. Which motor will have better full-load power factor?
Correct : B. b
75. A three phase induction motor is sometimes calles 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 equal to stator frequency?
Correct : A. it will not operate
76. and the rotor current I2 are zero at
Correct : A. ns
77. If use auto transformer method starting to start an induction motor to replace star-delta method, then the required tapping on the transformer will be
Correct : A. 57.73%
78. The starting method for a 3-phase squirrel-cage induction motor which is inferior in view of poor starting torque per ampere of line current drawn is?
Correct : A. series-inductor method of starting
79. 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
80. Upon which of the following parameters does the current intensity in arc welding depend?
Correct : B. electrode diameter
81. In which of the following welding processes we use two non-consumable electrodes?
Correct : C. atomic hydrogen
82. Which of the following brazing process is good for mass scale joining?
Correct : A. furnace
83. For grey cast iron, which of the following welding methods is preferable?
Correct : A. mig
84. Due to which of the following reasons, flux is not used in atomic hydrogen welding?
Correct : A. the burning hydrogen shields the molten metal
85. In resistance welding, between the electrodes, the nature of current and voltage parameters being used?
Correct : D. high current, low voltage
86. Which of the following welding process in which heat is produced for welding by a chemical reaction?
Correct : B. thermit welding
87. The maximum diameter of electrodes being used in submerged arc welding?
Correct : D. 10 mm
88. Which of the following gases are used in Tungsten inert gas welding?
Correct : C. argon and helium
89. Which of the following materials necessitates preheating in welding?
Correct : C. cast iron
90. Which of the following is also called “gas welding”?
Correct : A. oxy fuel gas welding
91. How many types of flames are there in welding?
Correct : C. 3
92. In which of the following type of flame, oxygen is in excess proportion with acetylene?
Correct : B. oxidizing flame
93. In which of the following type of flame, oxygen is deficient in proportion with acetylene?
Correct : C. carburizing flame
94. For brazing, soldering and flame hardening which of the following flame is used?
Correct : C. carburizing flame
95. The inner cone of the flame in welding has the following nature?
Correct : A. highest temperature
96. The oxy acetylene gas welding is a type of?
Correct : B. exothermic reaction
97. The chemical formula of acetylene is?
Correct : D. c2h2
98. Amount of time during which the transformer will be used for welding under normal loading condition is known as?
Correct : D. duty cycle
99. Amount of voltage required to generate the arc under no load condition is called?
Correct : A. open circuit voltage
100. In which of the following gas welding process a non-consumable electrode is used?