MCQOPTIONS
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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.
| 401. |
Blast furnace produces following by reduction of iron ore? |
| A. | Cast iron |
| B. | Pig iron |
| C. | Wrought iron |
| D. | Malleable iron |
| Answer» C. Wrought iron | |
| 402. |
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 anti-corrosion properties |
| Answer» B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties | |
| 403. |
Steel containing ferrite and pearlite is? |
| A. | Hard |
| B. | Soft |
| C. | Tough |
| D. | Hard and tough |
| Answer» C. Tough | |
| 404. |
The machinability of aluminium increases when _________ is added to aluminium.? |
| A. | Copper |
| B. | Magnesium |
| C. | Silicon |
| D. | Lead and bismuth |
| Answer» E. | |
| 405. |
Eutectoid reaction occurs at? |
| A. | 600°C |
| B. | 723°C |
| C. | 1147°C |
| D. | 1493°C |
| Answer» C. 1147¬¨‚àûC | |
| 406. |
Free cutting steels? |
| A. | Contain carbon in free from |
| B. | Require minimum cutting force |
| C. | Is used where rapid machining is the prime requirement |
| D. | Can be cut freely |
| Answer» D. Can be cut freely | |
| 407. |
Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio? |
| A. | 50 : 50 |
| B. | 30 : 70 |
| C. | 70 : 30 |
| D. | 40 : 60 |
| Answer» C. 70 : 30 | |
| 408. |
Depth of hardness of steel is increased by addition of? |
| A. | Nickel |
| B. | Chromium |
| C. | Tungsten |
| D. | Vanadium |
| Answer» C. Tungsten | |
| 409. |
Wrought iron? |
| A. | Is a ductile material |
| B. | Can be easily forged or welded |
| C. | Cannot stand sudden and excessive shocks |
| D. | All of these |
| Answer» E. | |
| 410. |
Which is the false statement about wrought iron? It has |
| A. | High resistance to rusting and corrosion |
| B. | High ductility |
| C. | Ability of hold protective coating |
| D. | Uniform strength in all directions |
| Answer» E. | |
| 411. |
Body centered cubic space lattice is found in |
| A. | Zinc, magnesium, cobalt, cadmium, antimony and bismuth |
| B. | Gamma iron, aluminium, copper, lead, silver and nickel |
| C. | Alpha iron, tungsten, chromium and molybdenum |
| D. | None of the above |
| Answer» D. None of the above | |
| 412. |
In a hardening process, the hypo-eutectoid steel is |
| A. | Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air |
| B. | Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium |
| C. | Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace |
| D. | Heated below or closes to the lower critical temperature and then cooled slowly |
| Answer» C. Heated from 30¬¨‚àûC to 50¬¨‚àûC above the upper critical temperature and then cooled slowly in the furnace | |
| 413. |
The tensile strength of wrought iron is maximum |
| A. | Along the lines of slag distribution |
| B. | Perpendicular to lines of slag distribution |
| C. | Uniform in all directions |
| D. | None of the above |
| Answer» B. Perpendicular to lines of slag distribution | |
| 414. |
In compression, a prism of brittle material will break |
| A. | By forming a bulge |
| B. | By shearing along oblique plane |
| C. | In direction perpendicular to application of load |
| D. | By crushing into thousands of pieces |
| Answer» C. In direction perpendicular to application of load | |
| 415. |
White 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. | Silver and chromium |
| Answer» D. Silver and chromium | |
| 416. |
When low carbon steel is heated up to upper critical temperature |
| A. | There is no change in grain size |
| B. | The average grain size is a minimum |
| C. | The grain size increases very rapidly |
| D. | The grain size first increases and then decreases very rapidly |
| Answer» C. The grain size increases very rapidly | |
| 417. |
Constantan 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 |
| Answer» E. | |
| 418. |
Tensile strength of steel can be safely increased by |
| A. | Adding carbon up to 2.8% |
| B. | Adding carbon up to 6.3% |
| C. | Adding carbon up to 0.83% |
| D. | Adding small quantities of copper |
| Answer» D. Adding small quantities of copper | |
| 419. |
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron. |
| A. | Cementite |
| B. | Free graphite |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 420. |
The molecules in a solid move |
| A. | In a random manner |
| B. | In a haphazard way |
| C. | In circular motion |
| D. | Back and forth like tiny pendulums |
| Answer» E. | |
| 421. |
A coarse grained steel |
| A. | Is less tough and has a greater tendency to distort during heat treatment |
| B. | Is more ductile and has a less tendency to distort during heat treatment |
| C. | Is less tough and has a less tendency to distort during heat treatment |
| D. | Is more ductile and has a greater tendency to distort during heat treatment |
| Answer» B. Is more ductile and has a less tendency to distort during heat treatment | |
| 422. |
The silicon steel is widely used for |
| A. | Connecting rods |
| B. | Cutting tools |
| C. | Generators and transformers in the form of laminated cores |
| D. | Motor car crankshafts |
| Answer» D. Motor car crankshafts | |
| 423. |
Wrought iron |
| A. | Is a ductile material |
| B. | Can be easily forged or welded |
| C. | Cannot stand sudden and excessive shocks |
| D. | All of these |
| Answer» E. | |
| 424. |
Steel contains |
| A. | 80% or more iron |
| B. | 50% or more iron |
| C. | Alloying elements like chromium, tungsten nickel and copper |
| D. | Elements like phosphorus, sulphur and silicon in varying quantities |
| Answer» C. Alloying elements like chromium, tungsten nickel and copper | |
| 425. |
In the lower part of the blast furnace (zone of fusion), the temperature is |
| A. | 400° to 700°C |
| B. | 800°C to 1000°C |
| C. | 1200°C to 1300°C |
| D. | 1500°C to 1700°C |
| Answer» D. 1500¬¨‚àûC to 1700¬¨‚àûC | |
| 426. |
The material in which the atoms are arranged chaotically, is called |
| A. | Amorphous material |
| B. | Mesomorphous material |
| C. | Crystalline material |
| D. | None of these |
| Answer» B. Mesomorphous material | |
| 427. |
The hardness is the property of a material due to which it |
| A. | Can be drawn into wires |
| B. | Breaks with little permanent distortion |
| C. | Can cut another metal |
| D. | Can be rolled or hammered into thin sheets |
| Answer» D. Can be rolled or hammered into thin sheets | |
| 428. |
Induction hardening is basically a |
| A. | Carburising process |
| B. | Surface hardening process |
| C. | Core hardening process |
| D. | None of these |
| Answer» C. Core hardening process | |
| 429. |
The hardness of steel primarily depends on |
| A. | Percentage of carbon |
| B. | Percentage of alloying elements |
| C. | Heat treatment employed |
| D. | Shape of carbides and their distribution in iron |
| Answer» E. | |
| 430. |
Nodular cast iron is produced by adding ________ to the molten cast iron. |
| A. | Nickel |
| B. | Chromium |
| C. | Copper |
| D. | Magnesium |
| Answer» E. | |
| 431. |
The presence of hydrogen in steel causes |
| A. | Reduced neutron absorption cross-section |
| B. | Improved Weldability |
| C. | Embrittlement |
| D. | Corrosion resistance |
| Answer» D. Corrosion resistance | |
| 432. |
German silver contains |
| A. | 1% silver |
| B. | 2% silver |
| C. | 5% silver |
| D. | No silver |
| Answer» E. | |
| 433. |
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as |
| A. | Eutectic cast irons |
| B. | Hypoeutectic cast irons |
| C. | Hypereutectic cast irons |
| D. | None of these |
| Answer» C. Hypereutectic cast irons | |
| 434. |
A material is known as allotropic or polymorphic if it |
| A. | Has a fixed structure under all conditions |
| B. | Exists in several crystal forms at different temperatures |
| C. | Responds to heat treatment |
| D. | Has its atoms distributed in a random pattern |
| Answer» C. Responds to heat treatment | |
| 435. |
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion. |
| A. | Sulphur |
| B. | Phosphorus |
| C. | Manganese |
| D. | Silicon |
| Answer» C. Manganese | |
| 436. |
Which of the following is an amorphous material? |
| A. | Mica |
| B. | Silver |
| C. | Lead |
| D. | Glass |
| Answer» E. | |
| 437. |
Silicon when added to copper improves |
| A. | Machinability |
| B. | Hardness |
| C. | Hardness and strength |
| D. | Strength and ductility |
| Answer» D. Strength and ductility | |
| 438. |
Which of the following is the binding material in cemented carbides? |
| A. | Cobalt |
| B. | Nickel |
| C. | Vanadium |
| D. | Iron |
| Answer» B. Nickel | |
| 439. |
The charge of the blast furnace consists of |
| A. | Calcined ore (8 parts), coke (4 parts) and limestone (1 part) |
| B. | Calcined ore (4 parts), coke (1 part) and limestone (8 parts) |
| C. | Calcined ore (1 part), coke (8 parts) and limestone (4 parts) |
| D. | Calcined ore, coke and limestone all in equal parts |
| Answer» B. Calcined ore (4 parts), coke (1 part) and limestone (8 parts) | |
| 440. |
Bronze is an alloy of |
| A. | Copper and zinc |
| B. | Copper and tin |
| C. | Copper, tin and zinc |
| D. | None of these |
| Answer» C. Copper, tin and zinc | |
| 441. |
Recrystallization temperature can be lowered by |
| A. | Purification of metal |
| B. | Grain refinement |
| C. | Working at lower temperature |
| D. | All of the above |
| Answer» E. | |
| 442. |
Cast iron is a |
| A. | Ductile material |
| B. | Malleable material |
| C. | Brittle material |
| D. | Tough material |
| Answer» D. Tough material | |
| 443. |
Which of the following material has maximum ductility? |
| A. | Mild steel |
| B. | Copper |
| C. | Nickel |
| D. | Aluminium |
| Answer» B. Copper | |
| 444. |
The stiffness is the ability of a material to resist |
| A. | Deformation under stress |
| B. | Fracture due to high impact loads |
| C. | Externally applied forces with breakdown or yielding |
| D. | None of the above |
| Answer» B. Fracture due to high impact loads | |
| 445. |
Which of the following has highest specific strength of all structural materials? |
| A. | Magnesium alloys |
| B. | Titanium alloys |
| C. | Chromium alloys |
| D. | Magnetic steel alloys |
| Answer» C. Chromium alloys | |
| 446. |
The electric process of steel making is especially adapted to |
| A. | Alloy and carbon tool steel |
| B. | Magnet steel |
| C. | High speed tool steel |
| D. | All of these |
| Answer» E. | |
| 447. |
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled$ |
| A. | In still air |
| B. | Slowly in the furnace |
| C. | Suddenly in a suitable cooling medium |
| D. | Any one of these |
| Answer» C. Suddenly in a suitable cooling medium | |
| 448. |
Which is false statement about case hardening? Case hardening is done by |
| A. | Electroplating |
| B. | Cyaniding |
| C. | Induction hardening |
| D. | Nitriding |
| Answer» B. Cyaniding | |
| 449. |
Which is false statement about annealing? Annealing is done to |
| A. | Relieve stresses |
| B. | Harden steel slightly |
| C. | Improve machining characteristic |
| D. | Soften material |
| Answer» C. Improve machining characteristic | |
| 450. |
Manganese in steel increases its |
| A. | Tensile strength |
| B. | Hardness |
| C. | Ductility |
| D. | Fluidity |
| Answer» B. Hardness | |