McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 51. |
As the tempering temp increases, hasdness of steel decreases |
| A. | true |
| B. | false |
| Answer» B. false | |
| 52. |
In case of Austempering, the quenching which is carried out, from high temp is known as |
| A. | fast cooling |
| B. | slow cooling |
| C. | interrupted cooling |
| D. | none of the above |
| Answer» C. interrupted cooling | |
| 53. |
In Austempering process, the final phase that is obtain after complete heat treatment cycle |
| A. | austenite |
| B. | bainite |
| C. | martensite |
| D. | pearlite |
| Answer» B. bainite | |
| 54. |
After Austempering process, the phase bainite which obtain is highly hard and brittle phase |
| A. | false |
| B. | true |
| Answer» A. false | |
| 55. |
one of the following is main advantage of Austempering process |
| A. | less distortion and cracking than martempering |
| B. | no need of final tempering process |
| C. | improvement in toughness |
| D. | all of the above |
| Answer» D. all of the above | |
| 56. |
hardenability is nothing but…….. |
| A. | ability of metals to get high hardness |
| B. | ability of metals to reduce brittleness |
| C. | ability of metals to get through harden |
| D. | none of the above |
| Answer» C. ability of metals to get through harden | |
| 57. |
hardenability of a metal or alloy is largely depend upon one of the following factor? |
| A. | the carbon content of a steel |
| B. | the alloy content of steel |
| C. | quenchng medium |
| D. | all of the above |
| Answer» D. all of the above | |
| 58. |
One of the following defect is aride dur to heat treatment process |
| A. | quench crack |
| B. | warping |
| C. | soft spots |
| D. | all of the above |
| Answer» D. all of the above | |
| 59. |
case hardening processes are those where…….. |
| A. | complete component is through harden |
| B. | complte component is melted |
| C. | only surface of the component ,whose hardness is incresed |
| D. | all of the above |
| Answer» C. only surface of the component ,whose hardness is incresed | |
| 60. |
In carburisng process which of the following element is diffused in a metal surface? |
| A. | nitrogen |
| B. | oxygen |
| C. | carbon |
| D. | carbide dioxide |
| Answer» C. carbon | |
| 61. |
Out of the following process,one is not valid with respect to carburising process |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | all of the above |
| Answer» D. all of the above | |
| 62. |
heat treatment is never required after carburisig treatment.this statement is ………… |
| A. | false |
| B. | true |
| C. | not applicable |
| D. | none of the above |
| Answer» A. false | |
| 63. |
In nitriding process which of the following element is diffused in a surface layer of a steel |
| A. | carbon |
| B. | carbon and nitrogen |
| C. | nitrogen |
| D. | all of the above |
| Answer» C. nitrogen | |
| 64. |
one of the following is a step for the procedureof precipitation hardening or age hardening? |
| A. | solution treatment |
| B. | quenching |
| C. | aging |
| D. | all of the above |
| Answer» D. all of the above | |
| 65. |
One of the following metal alloy is suitable for the precipitation hardenable alloy? |
| A. | al-zn |
| B. | al-ni |
| C. | al-cr |
| D. | al-cu |
| Answer» D. al-cu | |
| 66. |
in case of flame hardening ,the heat source is in the form of ……. |
| A. | lpg gas flame |
| B. | furnace oil flame |
| C. | oxy-acetylen flame |
| D. | none of the above |
| Answer» C. oxy-acetylen flame | |
| 67. |
in flame hardening process,the metal surface after heating to high temperature is quenched with …… |
| A. | oil |
| B. | brine water |
| C. | water |
| D. | all of the above |
| Answer» C. water | |
| 68. |
In case of carbonitriding,by diffusion of which elements the surface become harder of a metal |
| A. | only carbon |
| B. | carbon and nitrogen |
| C. | only nitrogen |
| D. | none of the above |
| Answer» B. carbon and nitrogen | |
| 69. |
Dislocation are stopped by a …… |
| A. | nuceation |
| B. | grain growth |
| C. | grain boundry |
| D. | none of the above |
| Answer» C. grain boundry | |
| 70. |
Finer grain size,higher will be the … |
| A. | hardness |
| B. | ductility |
| C. | yield stress |
| D. | none of the above |
| Answer» C. yield stress | |
| 71. |
Work hardening also called as |
| A. | precipetation hardening |
| B. | hardening |
| C. | strain hardening |
| D. | none of the above |
| Answer» C. strain hardening | |
| 72. |
some materials can not be work hardened at normal ambient temp. such as …….. Material. |
| A. | niobium |
| B. | indium |
| C. | beryllium |
| D. | none of the above |
| Answer» B. indium | |
| 73. |
In solid solution strengthening to ……the hardness of material. |
| A. | decreases |
| B. | increases |
| C. | reduced |
| D. | none of the above |
| Answer» B. increases | |
| 74. |
The number of solute atoms is more……will be the local distortion in the lattice. |
| A. | greater |
| B. | smaller |
| C. | less |
| D. | none of the above |
| Answer» A. greater | |
| 75. |
The press of finely distributed …….particles increases the elastic limit. |
| A. | soft |
| B. | hard |
| C. | atomic |
| D. | none of the above |
| Answer» B. hard | |
| 76. |
dispersion hardening materials can be produced with the help of ……process |
| A. | forging |
| B. | rolling |
| C. | powder metallurgy |
| D. | none of the above |
| Answer» C. powder metallurgy | |
| 77. |
out of the following methods ,one is method used flame hardening process? |
| A. | stationary method |
| B. | circular and progressive method |
| C. | spiral and progressive method |
| D. | all of the above |
| Answer» D. all of the above | |
| 78. |
for induction hardening process,the heat source is a ….. |
| A. | induction coil carrying current |
| B. | heating coil carrying current |
| C. | metallic probes carrying current |
| D. | none of the above |
| Answer» A. induction coil carrying current | |
| 79. |
one of the following is main disadvantage of flame hardeing process of nsurface hardeing? |
| A. | possibility of over heating and grain growth |
| B. | close control over case depth is not possible |
| C. | mostly suitable or symmetri components only |
| D. | all of the above |
| Answer» D. all of the above | |
| 80. |
Due to one of the reason given below,give rise to quench cracking? |
| A. | improper quenching medium |
| B. | improper selection of steel |
| C. | improper design of component |
| D. | all of the above |
| Answer» D. all of the above | |
| 81. |
the pearlitic microstructure which is obtain after patenting process is suitable to which manufacturing process |
| A. | casting of cylindrical block |
| B. | forging of cam shaft |
| C. | drawing of wires |
| D. | all of the above |
| Answer» C. drawing of wires | |
| 82. |
Identify following fig. |
| A. | iron-carbon pha diagram |
| B. | al-cu phase diagram |
| C. | t.t.t. daigram |
| D. | none of the above |
| Answer» C. t.t.t. daigram | |
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