MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 482 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
_ Blast furnace is used to produce$? |
| A. | Pig iron |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» B. Cast iron | |
| 302. |
_ When the steel is normalized, its$? |
| A. | Yield point increases |
| B. | Ductility decreases |
| C. | Ultimate tensile strength increases |
| D. | All of these |
| Answer» E. | |
| 303. |
_ Brass is an alloy of$? |
| A. | Copper and zinc |
| B. | Copper and tin |
| C. | Copper, tin and zinc |
| D. | None of these |
| Answer» B. Copper and tin | |
| 304. |
_ Which of the following impurity in cast iron makes it hard and brittle?$? |
| A. | Silicon |
| B. | Sulphur |
| C. | Manganese |
| D. | Phosphorus |
| Answer» C. Manganese | |
| 305. |
_ Acidic solution is one which has pH value$? |
| A. | Greater than 7 |
| B. | Less than 7 |
| C. | Equal to 7 |
| D. | pH value has nothing to do with neutral solution |
| Answer» C. Equal to 7 | |
| 306. |
_ Which of the following represents the allotropic forms of iron?$? |
| A. | Alpha iron, beta iron and gamma iron |
| B. | Alpha iron and beta iron |
| C. | Body centered cubic iron and face centered cubic iron |
| D. | Alpha iron, gamma from and delta iron |
| Answer» E. | |
| 307. |
_ Which is false statement about properties of aluminium?$? |
| A. | Modulus of elasticity is fairly low |
| B. | Wear resistance is very good |
| C. | Fatigue strength is not high |
| D. | Creep strength limits its use to fairly low temperatures |
| Answer» C. Fatigue strength is not high | |
| 308. |
_ For a steel containing 0.8% carbon$? |
| A. | There is no critical point |
| B. | There is only one critical point |
| C. | There are two critical points |
| D. | There can be any number of critical points |
| Answer» C. There are two critical points | |
| 309. |
_ Stress relaxation is the phenomenon$? |
| A. | In which parts are not loaded |
| B. | In which stress remains constant on increasing load |
| C. | In which deformation tends to loosen the joint and produces a stress reduced |
| D. | Stress reduces on increasing load |
| Answer» D. Stress reduces on increasing load | |
| 310. |
_ When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.$? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 311. |
_ 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 |
| Answer» B. A very high percentage of graphite | |
| 312. |
__The property of a material which enables it to retain the deformation permanently, is called__ |
| A. | Brittleness |
| B. | Ductility |
| C. | Malleability |
| D. | Plasticity |
| Answer» E. | |
| 313. |
__Aluminium bronze contains__ |
| A. | 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe |
| B. | 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg |
| C. | 10% aluminium and 90% copper |
| D. | 90% magnesium and 9% aluminium with some copper |
| Answer» D. 90% magnesium and 9% aluminium with some copper | |
| 314. |
__Addition of copper to aluminium results in__ |
| A. | Improvement of casting characteristics |
| B. | Improvement of corrosion resistance |
| C. | One of the best known age and precipitation hardening systems |
| D. | Improving machinability |
| Answer» D. Improving machinability | |
| 315. |
__The hardness and tensile strength in austenitic stainless steel can be increased by__ |
| A. | Hardening and cold working |
| B. | Normalizing |
| C. | Martempering |
| D. | Full annealing |
| Answer» B. Normalizing | |
| 316. |
__Combined carbon in iron makes the metal__ |
| A. | Soft and gives coarse grained crystalline structure |
| B. | Soft and gives a fine grained crystalline structure |
| C. | Hard and gives a coarse grained crystalline structure |
| D. | Hard and gives a fine grained crystalline structure |
| Answer» E. | |
| 317. |
__Which of the following metal is used for nuclear energy?__ |
| A. | Uranium |
| B. | Thorium |
| C. | Niobium |
| D. | All of these |
| Answer» E. | |
| 318. |
__An example of amorphous material is__ |
| A. | Zinc |
| B. | Lead |
| C. | Silver |
| D. | Glass |
| Answer» E. | |
| 319. |
__Process of Austempering results in__ |
| A. | Formation of bainite structure |
| B. | Carburised structure |
| C. | Martenistic structure |
| D. | Lamellar layers of carbide distributed throughout the structure |
| Answer» B. Carburised structure | |
| 320. |
__Nickel 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 anti-corrosion properties |
| Answer» E. | |
| 321. |
__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 |
| Answer» E. | |
| 322. |
__White cast iron contains carbon in the form of__ |
| A. | Free carbon |
| B. | Graphite |
| C. | Cementite |
| D. | White carbon |
| Answer» D. White carbon | |
| 323. |
__The usual composition of a soldering alloy is__ |
| A. | Tin, lead and small percentage of antimony |
| B. | Tin and lead |
| C. | Tin, lead and silver |
| D. | Tin and copper |
| Answer» B. Tin and lead | |
| 324. |
__For the allotropic forms of iron, the points of arrest are__ |
| A. | The points where no further change occurs |
| B. | Constant for all metals |
| C. | The points where there is no further flow of metal |
| D. | The points of discontinuity |
| Answer» E. | |
| 325. |
__White 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 material |
| Answer» C. Is produced by annealing process. It is soft, tough and easily machined metal | |
| 326. |
__Permalloy is a__ |
| A. | Kind of stainless steel |
| B. | None ferrous alloy |
| C. | Polymer |
| D. | Nickel and iron alloy having high permeability |
| Answer» E. | |
| 327. |
__Nodular iron has__ |
| A. | High machinability |
| B. | Low melting point |
| C. | High tensile strength |
| D. | All of the above |
| Answer» E. | |
| 328. |
__Monel metal contains__ |
| A. | 63 to 67% nickel and 30% copper |
| B. | 88% copper and 10% tin and rest zinc |
| C. | Alloy of tin, lead and cadmium |
| D. | Malleable iron and zinc |
| Answer» B. 88% copper and 10% tin and rest zinc | |
| 329. |
__Balls for ball bearings are made of__ |
| A. | Cast iron |
| B. | Mild steel |
| C. | Stainless steel |
| D. | Carbon-chrome steel |
| Answer» E. | |
| 330. |
__The material widely used for making pendulums of clocks is__ |
| A. | Stainless steel |
| B. | High speed steel |
| C. | Heat resisting steel |
| D. | Nickel steel |
| Answer» E. | |
| 331. |
_The percentage of carbon in low carbon steel is$? |
| A. | 0.05% |
| B. | 0.15% |
| C. | 0.3% |
| D. | 0.5% |
| Answer» C. 0.3% | |
| 332. |
_Malleability of a material can be defined as$? |
| A. | Ability to undergo large permanent deformations in compression |
| B. | Ability to recover its original form |
| C. | Ability to undergo large permanent deformations in tension |
| D. | All of the above |
| Answer» B. Ability to recover its original form | |
| 333. |
_Brass contains$? |
| 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 |
| Answer» B. 90% copper and 10% tin | |
| 334. |
_Carbon steel is$? |
| A. | Made by adding carbon in steel |
| B. | Refined from cast iron |
| C. | An alloy of iron and carbon with varying quantities of phosphorus and sulphur |
| D. | Extensively used for making cutting tools |
| Answer» D. Extensively used for making cutting tools | |
| 335. |
_The defect which takes place due to imperfect packing of atoms during crystallization is known as$? |
| A. | Line defect |
| B. | Surface defect |
| C. | Point defect |
| D. | None of these |
| Answer» D. None of these | |
| 336. |
_Delta iron occurs at temperature of$? |
| A. | Room temperature |
| B. | Above melting point |
| C. | Between 1400°C and 1539°C |
| D. | Between 910°C and 1400°C |
| Answer» D. Between 910¬¨‚àûC and 1400¬¨‚àûC | |
| 337. |
_Shock resistance of steel is increased by adding$? |
| A. | Nickel |
| B. | Chromium |
| C. | Nickel and chromium |
| D. | Sulphur, lead and phosphorus |
| Answer» D. Sulphur, lead and phosphorus | |
| 338. |
_A cold chisel is made of$? |
| A. | Mild steel |
| B. | Cast iron |
| C. | H.S.S. |
| D. | High carbon |
| Answer» E. | |
| 339. |
_Ductile cast iron$? |
| 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 material |
| Answer» E. | |
| 340. |
_In high speed steels, manganese is used to tougher the metal and to increase its$? |
| A. | Yield point |
| B. | Critical temperature |
| C. | Melting point |
| D. | Hardness |
| Answer» C. Melting point | |
| 341. |
_When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of$? |
| A. | Mainly ferrite |
| B. | Mainly pearlite |
| C. | Ferrite and pearlite |
| D. | Pearlite and cementite |
| Answer» D. Pearlite and cementite | |
| 342. |
_The cupola is used to manufacture$? |
| A. | Pig iron |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» C. Wrought iron | |
| 343. |
_Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio$? |
| A. | 50 : 20 : 20 : 10 |
| B. | 40 : 30 : 20 : 10 |
| C. | 50 : 20 : 10 : 20 |
| D. | 30 : 20 : 30 : 20 |
| Answer» B. 40 : 30 : 20 : 10 | |
| 344. |
_By severely deforming a metal in a particular direction it becomes$? |
| A. | Ductile |
| B. | Malleable |
| C. | Homogeneous |
| D. | Anisotropic |
| Answer» E. | |
| 345. |
_Foundry crucible is made of$? |
| A. | Mild steel |
| B. | German silver |
| C. | Lead |
| D. | Graphite |
| Answer» E. | |
| 346. |
_A material is said to be allotropic, if it has$? |
| A. | Fixed structure at all temperatures |
| B. | Atoms distributed in random pattern |
| C. | Different crystal structures at different temperatures |
| D. | Any one of the above |
| Answer» D. Any one of the above | |
| 347. |
_The temperature required for full annealing in hypereutectoid steel is$? |
| A. | 30° C to 50° C above upper critical temperature |
| B. | 30° C to 50° C below upper critical temperature |
| C. | 30° C to 50° C above lower critical temperature |
| D. | 30° C to 50° C below lower critical temperature |
| Answer» D. 30¬¨‚àû C to 50¬¨‚àû C below lower critical temperature | |
| 348. |
_Sulphur in steel$? |
| A. | Acts as deoxidiser |
| B. | Reduces the grain size |
| C. | Decreases tensile strength and hardness |
| D. | Lowers the toughness and transverse ductility |
| Answer» E. | |
| 349. |
_Hardness of lower bainite (tempered martensite) is about$? |
| A. | RC 65 |
| B. | RC 48 |
| C. | RC 57 |
| D. | RC 80 |
| Answer» D. RC 80 | |
| 350. |
_Which of the following has a fine gold colour and is used for imitation jewellery?$? |
| A. | Silicon bronze |
| B. | Aluminium bronze |
| C. | Gun metal |
| D. | Babbitt metal |
| Answer» C. Gun metal | |