MCQOPTIONS
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MCQOPTIONS
This section includes 92 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
In anneling process the metal from high temp is cooled very slowly in the furnace. This statement is ----- |
| A. | true |
| B. | false |
| Answer» B. false | |
| 52. |
one of the following is a purpose of anneling |
| A. | to soften the metal |
| B. | to relieve internal stresses |
| C. | to improve machinability |
| D. | all of the above |
| Answer» E. | |
| 53. |
one of the following is heat treatment process for metal |
| A. | casting |
| B. | forging |
| C. | rolling |
| D. | none of the above |
| Answer» E. | |
| 54. |
Heat treatment can be defined as |
| A. | heating the metal in a solid state and then cooling it in a different manner |
| B. | heating the metal to melting point nad then cool to room temperature |
| C. | both a and b |
| D. | none of the above |
| Answer» B. heating the metal to melting point nad then cool to room temperature | |
| 55. |
One of the main purpose of heat treatment |
| A. | to improve ductility and strength |
| B. | to relieve internal stresses |
| C. | to improve machinability |
| D. | all of the above |
| Answer» E. | |
| 56. |
In the heat treatment cycle CCT means------- |
| A. | coolest cooling rate |
| B. | compared cooling rate |
| C. | critical cooling rate |
| D. | none of the above |
| Answer» D. none of the above | |
| 57. |
The isothermal transformation diagram i.e. TTT diagrams are -------- |
| A. | total transformation time |
| B. | total temperature transformation |
| C. | time temperature transformation |
| D. | none of the above |
| Answer» D. none of the above | |
| 58. |
Martensite phase is obtain by |
| A. | fast cooling or quenching |
| B. | slow cooling |
| C. | no cooling |
| D. | none of the above |
| Answer» B. slow cooling | |
| 59. |
Bainite phase is divided into two types-------and-------- |
| A. | upper bainite and lower bainite |
| B. | large bainite and small bainite |
| C. | fast bainite and slow bainite |
| D. | none of the above |
| Answer» B. large bainite and small bainite | |
| 60. |
transformation of austenite to bainite starts from nucleation of-------at austenitic grain boundary |
| A. | ferrite |
| B. | cementite |
| C. | pearlite |
| D. | none of the above |
| Answer» B. cementite | |
| 61. |
One of the following is a heat treatment process for metals |
| A. | annealing |
| B. | normalising |
| C. | hardening |
| D. | all of the above |
| Answer» E. | |
| 62. |
Pearlite is madeup of alternate colonies or lamilies of ---------and ------- |
| A. | ferrite and martensite |
| B. | ferrite and pearlite |
| C. | ferrite and cementite |
| D. | none of the above |
| Answer» D. none of the above | |
| 63. |
Following is one of the heat treatment process. |
| A. | melting |
| B. | solidification |
| C. | hardening |
| D. | none of the above |
| Answer» D. none of the above | |
| 64. |
From the following process,one is not a heat treatment process |
| A. | annealing |
| B. | normalising |
| C. | hardening |
| D. | machining |
| Answer» E. | |
| 65. |
The Chemical formula for cementite is |
| A. | fe3c |
| B. | fec3 |
| C. | fe2c3 |
| D. | none of the above |
| Answer» B. fec3 | |
| 66. |
One of the following is a transformation product of austenite. |
| A. | austenite to ferrite |
| B. | austenite to ledeburite |
| C. | austenite to pearlite |
| D. | none of the above |
| Answer» D. none of the above | |
| 67. |
In case of hardening heat treatment process hypereutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» C. acm | |
| 68. |
In case of normalising heat treatment process hypereutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» D. none of the above | |
| 69. |
In case of Annealing heat treatment process hypereutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» C. acm | |
| 70. |
In case of hardening heat treatment process hypoeutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» C. acm | |
| 71. |
In case of Normalizing heat treatment process hypoeutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» C. acm | |
| 72. |
In case of annealing heat treatment process hypoeutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» C. acm | |
| 73. |
The Atomic structure of martensite is |
| A. | b.c.c |
| B. | b.c.t |
| C. | h.c.p |
| D. | f.c.c |
| Answer» C. h.c.p | |
| 74. |
The Atomic structure of austenite phase is |
| A. | b.c.c |
| B. | b.c.t |
| C. | h.c.p |
| D. | f.c.c |
| Answer» E. | |
| 75. |
Cementite is harder than pearlite,this statement id ------- |
| A. | false |
| B. | true |
| C. | not applicable |
| D. | none of the above |
| Answer» C. not applicable | |
| 76. |
Pearlite is harder than ferrite,this statement is------- |
| A. | true |
| B. | false |
| C. | not applicable |
| D. | none of the above |
| Answer» B. false | |
| 77. |
which 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» E. | |
| 78. |
In petenting process, which is the final phase obtainafter completion of heat treatment |
| A. | pearlite |
| B. | bainite |
| C. | martensite |
| D. | austenite |
| Answer» B. bainite | |
| 79. |
In martempering heat treatment, the final phase which obtain |
| A. | ferrite |
| B. | austenite |
| C. | pearlite |
| D. | none of the above |
| Answer» E. | |
| 80. |
martempering is also known as |
| A. | marheating |
| B. | marcooling |
| C. | marquenching |
| D. | none of the above |
| Answer» D. none of the above | |
| 81. |
in jominy end quench test sample is quenched by |
| A. | water |
| B. | oil |
| C. | brine water |
| D. | all of the above |
| Answer» B. oil | |
| 82. |
in case of flame hardening the heat source in the form of |
| A. | lpg gas flame |
| B. | furnace oil flame |
| C. | oxy-acetelene flame |
| D. | none of the above |
| Answer» D. none of the above | |
| 83. |
in case of carbonitriding by diffusion of which elements the surface become harder of the metal |
| A. | only carbon |
| B. | carbon and nitrogen |
| C. | only nitrogen |
| D. | none of the above |
| Answer» C. only nitrogen | |
| 84. |
Dispersion hardening materials can be produced with the help of followinf process |
| A. | forging |
| B. | rolling |
| C. | powder metallurgy |
| D. | none of the above |
| Answer» D. none of the above | |
| 85. |
The hardness of quenched Martensite |
| A. | increases with increasing carbon percentage |
| B. | decreases as carbon percentage increases |
| C. | first increases and then remains almost constant as the carbon percentage increases |
| D. | first increases and then decreases as carbon percentage increases. |
| Answer» D. first increases and then decreases as carbon percentage increases. | |
| 86. |
Which of the following processes is used to harden a steel? |
| A. | normalizing |
| B. | annealing |
| C. | carburizing |
| D. | quenching |
| Answer» E. | |
| 87. |
Match the phases of steel in Group I with the crystal structures in Group II P. Martensite 1. bcc Q. Cementite 2. fcc R. Austenite 3. bct S. Ferrite 4. Orthorhombic |
| A. | p-3, q-4, r-1, s-2 |
| B. | p-2, q-3, r-1, s-4 |
| C. | p-3, q-4, r-2, s-1 |
| D. | p-4, q-3, r-2, s-1 |
| Answer» D. p-4, q-3, r-2, s-1 | |
| 88. |
Annealing is generally done to impart |
| A. | hardness to the material |
| B. | softness to the material |
| C. | brittleness to the material |
| D. | high conductivity to the material |
| Answer» C. brittleness to the material | |
| 89. |
Which one of the following is not the purpose of full annealing |
| A. | refines grains |
| B. | induces softness |
| C. | removes strains and stresses |
| D. | produces hardest material |
| Answer» E. | |
| 90. |
Fine grain sizes are obtained by |
| A. | slow cooling |
| B. | increasing nucleation rate |
| C. | decreasing growth rate |
| D. | fast cooling |
| Answer» B. increasing nucleation rate | |
| 91. |
In normalizing, one of the following is not correct |
| A. | it relieves internal stresses |
| B. | it produces a uniform structure |
| C. | the rate of cooling is rapid |
| D. | the rate of cooling is slow |
| Answer» E. | |
| 92. |
An eutectoid steel consists of |
| A. | wholly pearlite |
| B. | wholly austenite |
| C. | pearlite and ferrite |
| D. | pearlite and cementite |
| Answer» B. wholly austenite | |