MCQOPTIONS
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MCQOPTIONS
This section includes 176 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
High carbon steel carries carbon %age c_________________? |
| A. | 0.1 to 0.3% |
| B. | 0.3 to 0.6% |
| C. | 0.6 to 0.8% |
| D. | 0.8 to 1.5% |
| E. | 1.5 to 2.5%. |
| Answer» E. 1.5 to 2.5%. | |
| 102. |
Heavy duty leaf and coil spring* contain carbon of the following order ________________? |
| A. | 0.2% |
| B. | 0.5% |
| C. | 0.8% |
| D. | 1.0% |
| E. | 1.5%. |
| Answer» E. 1.5%. | |
| 103. |
Hardness of martensite is about___________________? |
| A. | RC 65 |
| B. | RC 48 |
| C. | RC 57 |
| D. | RC 80 |
| E. | RC 32 |
| Answer» B. RC 48 | |
| 104. |
Hardness of upper bainite (acicular structure) is about___________________? |
| A. | RC 65 |
| B. | RC 48 |
| C. | RC 57 |
| D. | RC 80 |
| E. | RC 32. |
| Answer» C. RC 57 | |
| 105. |
Hardness of steel depends on_________________? |
| A. | amount of carbon it contains |
| B. | the shape and distribution of the car-bides in iron |
| C. | method of fabrication |
| D. | contents of alloying elements |
| E. | the quality of ore from which it is made |
| Answer» C. method of fabrication | |
| 106. |
Hardness of lower bainite (tempered martensite) is about________________? |
| A. | RC 65 |
| B. | RC 48 |
| C. | RC 57 |
| D. | RC 80 |
| E. | RC 32 |
| Answer» D. RC 80 | |
| 107. |
Gun metal contains__________________? |
| A. | 70% copper and 30% zinc |
| B. | 90% copper and 10% tin |
| C. | 85-92% copper and rest tin with little lead and nickel |
| D. | 70-78% copper and rest tin |
| E. | 85-92% copper and rest zinc |
| Answer» D. 70-78% copper and rest tin | |
| 108. |
Grey cast iron_____________________? |
| A. | contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron |
| B. | is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable |
| C. | is produced by annealing process. I is soft, tough and easily machinec metal |
| D. | is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the mate |
| E. | none of the above is true |
| Answer» B. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable | |
| 109. |
German silver is an alloy of___________________? |
| A. | silver and some impurities |
| B. | refined silver |
| C. | nickel, copper and zinc |
| D. | nickel and copper |
| E. | silver and gold |
| Answer» D. nickel and copper | |
| 110. |
German silver contains_________________? |
| A. | 1% silver |
| B. | 2.5% silver |
| C. | 5% silver |
| D. | 10% silver |
| E. | 100% silver |
| Answer» D. 10% silver | |
| 111. |
Gamma iron exits at following temperature___________________? |
| A. | room temperature |
| B. | near melting point |
| C. | between 1400°C and 1539°C |
| D. | between 910°C and 1400°C |
| E. | none of the above |
| Answer» E. none of the above | |
| 112. |
Free cutting steels_____________________? |
| A. | are used where ease in machining is the criterion |
| B. | contain carbon in free form |
| C. | require least cutting force |
| D. | do not exist |
| E. | can be cut freely even under adverse conditions |
| Answer» B. contain carbon in free form | |
| 113. |
Foundry crucible is made of_________________? |
| A. | mild steel |
| B. | german silver |
| C. | lead |
| D. | cast iron |
| E. | graphite |
| Answer» F. | |
| 114. |
For the allotropic forms of iron, the points of arrest are __________________? |
| A. | the points where no further change oc-curs |
| B. | constant for all metals |
| C. | the points where there is no further flow of metal |
| D. | the points of discontinuity |
| E. | the points where major changes take place |
| Answer» E. the points where major changes take place | |
| 115. |
Following elements have face-centred cubic structure__________________? |
| A. | gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt |
| B. | Mg, Zn, Ti, Zr, Br, Cd |
| C. | a iron (below 910°C and between 1400 to 1539°C), W |
| D. | all of the above |
| E. | none of the above |
| Answer» B. Mg, Zn, Ti, Zr, Br, Cd | |
| 116. |
Ferromagnetic alpha iron exists in temperature range of________________? |
| A. | below 723°C |
| B. | 770 – 910°C |
| C. | 910-1440°C |
| D. | 1400-1539°C |
| E. | above 1539°C |
| Answer» B. 770 – 910°C | |
| 117. |
Eutectoid steel contains following percentage of carbon_______________? |
| A. | 0.02% |
| B. | 0.3% |
| C. | 0.63% |
| D. | 0.8% |
| E. | 1.2%. |
| Answer» E. 1.2%. | |
| 118. |
Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element__________________? |
| A. | iron |
| B. | copper |
| C. | aluminium |
| D. | zinc |
| E. | nickel |
| Answer» F. | |
| 119. |
DuraJomin contains___________________? |
| A. | 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe |
| B. | 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg |
| C. | 10% aluminium and 90% copper |
| D. | 90% magnesium and 9% aluminium with some copper |
| E. | 94% aluminium and 6% tin |
| Answer» B. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg | |
| 120. |
Ductility of a material can be defined as__________________? |
| A. | ability to undergo large permanent deformations in compression |
| B. | ability to recover its original form |
| C. | ability to undergo large permanent deformations in tension |
| D. | all of the above |
| E. | none of the above |
| Answer» D. all of the above | |
| 121. |
Ductile cast iron___________________? |
| A. | contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron |
| B. | is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable |
| C. | is produced by annealing process. It is soft, tough and easily machined metal |
| D. | is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the m |
| E. | none of the above |
| Answer» E. none of the above | |
| 122. |
Drop forging dies contain carbon of the order of_________________? |
| A. | 0.1 to 0.2% |
| B. | 0.25 to 0.5% |
| C. | 0.6 to 0.7% |
| D. | 0.7 to 0.9% |
| E. | 1.0 to 1.2%. |
| Answer» D. 0.7 to 0.9% | |
| 123. |
Dow metal contains____________________? |
| A. | 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe |
| B. | 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg |
| C. | 90% aluminium and 90% copper |
| D. | 90% magnesium and 9% aluminium with some copper |
| E. | 90% magnesium and 10% tin |
| Answer» E. 90% magnesium and 10% tin | |
| 124. |
Depth of hardness of steel is increased by addition of_________________? |
| A. | nickel |
| B. | chromium |
| C. | tungsten |
| D. | vanadium |
| E. | all of the above |
| Answer» C. tungsten | |
| 125. |
Delta metal is an alloy of__________________? |
| A. | copper, zinc and iron |
| B. | iron, nickel and copper |
| C. | iron, lead and tin |
| D. | iron, aluminium and magnesium |
| E. | copper, zinc and antimony |
| Answer» B. iron, nickel and copper | |
| 126. |
Delta iron occurs at temperature of_______________? |
| A. | room temperature |
| B. | above melting point |
| C. | between 1400°C and 1539°C |
| D. | between 910°C and 1400°C |
| E. | none of the above |
| Answer» D. between 910°C and 1400°C | |
| 127. |
Cyaniding is the process of________________? |
| A. | dipping steel in cyanide bath |
| B. | reacting steel surface with cyanide salts |
| C. | adding carbon and nitrogen by heat treatment of steel to increase its surface hardness |
| D. | obtaining cyanide salts |
| E. | making corrosion resistant steel |
| Answer» D. obtaining cyanide salts | |
| 128. |
Cupola produces following material__________________? |
| A. | cast iron |
| B. | pig iron |
| C. | wrought iron |
| D. | malleable iron |
| E. | white iron |
| Answer» B. pig iron | |
| 129. |
Corrundum contains more than 95% _____________________? |
| A. | steel |
| B. | A1203 |
| C. | Si02 |
| D. | MgO |
| E. | german silver |
| Answer» C. Si02 | |
| 130. |
Corrosion resistance of steel is increased by addition of________________? |
| A. | chromium and nickel |
| B. | sulphur, phosphorus, lead |
| C. | vanadium, aluminium |
| D. | tungsten, molybdenum, vanadium, chromium |
| E. | zinc |
| Answer» B. sulphur, phosphorus, lead | |
| 131. |
Corrosion resistance of steel is increased by adding__________________? |
| A. | chromium and nickel |
| B. | nickel and molybdenum |
| C. | aluminium and zinc |
| D. | tungsten and sulfur |
| E. | none of the above |
| Answer» B. nickel and molybdenum | |
| 132. |
Constantant an alloy used in thermocouples is an alloy of __________________? |
| A. | copper and tin |
| B. | copper and zinc |
| C. | copper and iron |
| D. | copper and nickel |
| E. | copper and chromium |
| Answer» E. copper and chromium | |
| 133. |
Connecting rod is usually made of_________________? |
| A. | aluminium |
| B. | low carbon steel |
| C. | medium carbon steel |
| D. | high carbon steel |
| E. | cast iron |
| Answer» D. high carbon steel | |
| 134. |
Compressive strength of grey cast iron in tonnes/cm is of the order of___________________? |
| A. | 3- 5 |
| B. | 5-7 |
| C. | 7-10 |
| D. | 10-15 |
| E. | 15-22 |
| Answer» C. 7-10 | |
| 135. |
Cold rolled steel sheets contain carbon of the following order___________________? |
| A. | 0.1% |
| B. | 0.2% |
| C. | 0.4% |
| D. | 0.6% |
| E. | 0.8% |
| Answer» B. 0.2% | |
| 136. |
Cobalt in steel __________________? |
| A. | improves wear resistance, cuttinability and toughness |
| B. | refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties |
| C. | improves cutting ability and reduce hardenability |
| D. | gives ductility, toughness, tensile strength and anti corrosion property: |
| E. | none of the above |
| Answer» D. gives ductility, toughness, tensile strength and anti corrosion property: | |
| 137. |
Chromium in steel_________________? |
| A. | improves wear resistance, cutting ability and toughness |
| B. | refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties |
| C. | improves cutting ability and reduces hardenability |
| D. | gives ductility, toughness, tensile strength and anticorrosion properties |
| E. | makes steel hard |
| Answer» B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties | |
| 138. |
Chilled cast iron has____________________? |
| A. | no graphite |
| B. | a very high percentage of graphite |
| C. | a low percentage of graphite |
| D. | graphite as its basic constituent of composition |
| E. | none of the above is true |
| Answer» B. a very high percentage of graphite | |
| 139. |
Cemented carbide tools are not found to be suitable for cutting_______________? |
| A. | brass |
| B. | cast iron |
| C. | aluminium |
| D. | steel |
| E. | non-ferrous alloys |
| Answer» E. non-ferrous alloys | |
| 140. |
Cast iron is characterised by minimum of following %age of carbon_________________? |
| A. | 0.2% |
| B. | 0.8% |
| C. | 1.3% |
| D. | 2% |
| E. | 6.3%. |
| Answer» E. 6.3%. | |
| 141. |
Cast iron has_________________? |
| A. | high tensile strength |
| B. | its elastic limit close to the ultimate breaking strength |
| C. | high ductility |
| D. | all of the above |
| E. | none of the above |
| Answer» C. high ductility | |
| 142. |
Carbon steel is_______________? |
| A. | made by adding carbon in steel |
| B. | refined from cast iron |
| C. | an alloy of iron and carbon with varying quantities of phosphorus and sulphur |
| D. | extensively used for making cutting tools |
| E. | extremely brittle |
| Answer» D. extensively used for making cutting tools | |
| 143. |
Carbon in iron is an example of__________________? |
| A. | substitutional solution |
| B. | interstitial solid solution |
| C. | intermetallic compounds |
| D. | all of the above |
| E. | none of the above |
| Answer» C. intermetallic compounds | |
| 144. |
By severely deforming a metal in a particular direction it becomes _________________? |
| A. | ductile |
| B. | malleable |
| C. | homogeneous |
| D. | isotropic |
| E. | anisotropic |
| Answer» F. | |
| 145. |
Bronze contains_____________________? |
| A. | 70% copper and 30% zinc |
| B. | 90% copper and 10% tin |
| C. | 85-92% copper and rest tin with little lead and nickel |
| D. | 70-75% copper and rest tin |
| E. | 90% copper and 10% zinc |
| Answer» C. 85-92% copper and rest tin with little lead and nickel | |
| 146. |
Brass contains___________________? |
| A. | 70% copper and 30% zinc |
| B. | 90% copper and 10% tin |
| C. | 85-92% copper and rest tin with little lead and nickel |
| D. | 70-75% copper and rest tin |
| E. | 70% copper and 30% tin |
| Answer» B. 90% copper and 10% tin | |
| 147. |
Brass (alloy of copper and zinc) is an example of__________________? |
| A. | substitutional solid solution |
| B. | interstitial solid solution |
| C. | intermetallic compounds |
| D. | all of the above |
| E. | none of the above |
| Answer» B. interstitial solid solution | |
| 148. |
Blast furnace produces following by reduction of iron ore_______________? |
| A. | cast iron |
| B. | pig iron |
| C. | wrought iron |
| D. | malleable iron |
| E. | white iron |
| Answer» C. wrought iron | |
| 149. |
Bell metal contains_____________________? |
| A. | 70% copper and 30% zinc |
| B. | 90% copper and 10% tin |
| C. | 85-92% copper and rest tin with little lead and nickel |
| D. | 70-75% copper and rest tin |
| E. | 70-75% copper and rest zinc and tin |
| Answer» E. 70-75% copper and rest zinc and tin | |
| 150. |
Basic solution is one which has pH value___________________? |
| A. | greater than 7 |
| B. | equal to 7 |
| C. | less than 7 |
| D. | pH value has nothing to do with basic solution |
| E. | none of the above |
| Answer» B. equal to 7 | |