MCQOPTIONS
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MCQOPTIONS
This section includes 614 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
Which of the following pipes is least corrosion resistant |
| A. | brass |
| B. | mild steel |
| C. | cast iron |
| D. | wrought iron |
| Answer» E. | |
| 552. |
Connecting rod is usually made of |
| A. | aluminium |
| B. | low carbon steel |
| C. | medium carbon steel |
| D. | high carbon steel |
| Answer» D. high carbon steel | |
| 553. |
Tungsten 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 |
| Answer» C. improves cutting ability and reduces hardenability | |
| 554. |
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. | |
| 555. |
Cemented carbide tools are not found to be suitable for cutting |
| A. | brass |
| B. | cast iron |
| C. | aluminium |
| D. | steel |
| Answer» E. | |
| 556. |
Which of the following is the binding material in cemented carbides |
| A. | cobalt |
| B. | nickel |
| C. | vanadium |
| D. | iron |
| Answer» B. nickel | |
| 557. |
Which is false statement about case hardening. Case hardening is done by |
| A. | electroplating |
| B. | cyaniding |
| C. | induction hardening |
| D. | nitriding |
| Answer» B. cyaniding | |
| 558. |
Dislocations in materials refer to the following type of defect |
| A. | point defect |
| B. | line defect |
| C. | plane defect |
| D. | volumetric defect |
| Answer» C. plane defect | |
| 559. |
Amorphous material is one |
| A. | in which atoms align themselves in a geometric pattern upon solidification |
| B. | in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid |
| C. | which is not attacked by phosphorous |
| D. | which emits fumes on melting |
| Answer» C. which is not attacked by phosphorous | |
| 560. |
Vanadium in high speed steels |
| A. | promotes decarburisation |
| B. | provides high hot hardness |
| C. | forms very hard carbides and thus in-creases wear resistance |
| D. | promotes retention of austenite |
| Answer» D. promotes retention of austenite | |
| 561. |
Argentite is the principal ore or raw material for |
| A. | aluminium |
| B. | tin |
| C. | zinc |
| D. | Silver |
| Answer» E. | |
| 562. |
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 | |
| 563. |
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 |
| Answer» B. interstitial solid solution | |
| 564. |
Materials after cold working are subjected to following process to relieve stresses |
| A. | hot working |
| B. | tempering |
| C. | normalising |
| D. | annealing |
| Answer» E. | |
| 565. |
Weld decay is the phenomenon found with |
| A. | cast iron |
| B. | mild steel |
| C. | non-ferrous materials |
| D. | stainless steel. |
| Answer» E. | |
| 566. |
Hardness of martensite is about |
| A. | RC 65 |
| B. | RC 48 |
| C. | RC 57 |
| D. | RC 80 |
| Answer» B. RC 48 | |
| 567. |
The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as |
| A. | hysteresis |
| B. | creep |
| C. | visco elasticity |
| D. | Boeschinger effect |
| Answer» E. | |
| 568. |
Induction hardening is the process of |
| A. | hardening surface of workpiece to ob-tain hard and wear resistant surface |
| B. | heating and cooling rapidly |
| C. | increasing hardness throughout |
| D. | inducing hardness by continuous process |
| Answer» B. heating and cooling rapidly | |
| 569. |
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 |
| Answer» D. obtaining cyanide salts | |
| 570. |
By severely deforming a metal in a particular direction it becomes |
| A. | ductile |
| B. | malleable |
| C. | isotropic |
| D. | anisotropic |
| Answer» E. | |
| 571. |
Inconel is an alloy of |
| A. | nickel, chromium and iron |
| B. | nickel, copper |
| C. | nickel, chromium |
| D. | nickel, zinc |
| Answer» B. nickel, copper | |
| 572. |
An engineer's hammer is made of |
| A. | cast iron |
| B. | forged steel |
| C. | mild steel |
| D. | high carbon steel |
| Answer» E. | |
| 573. |
German silver is an alloy of |
| A. | silver and some impurities |
| B. | refined silver |
| C. | nickel, copper and zinc |
| D. | silver and gold |
| Answer» D. silver and gold | |
| 574. |
Basic constituents of Monel metal are |
| A. | nickel, copper |
| B. | nickel, molybdenum |
| C. | zinc, tin, lead |
| D. | nickel, lead and tin |
| Answer» B. nickel, molybdenum | |
| 575. |
The basic constituents of Hastelloy are |
| A. | aluminium, copper etc. |
| B. | nickel, molybdenum etc. |
| C. | nickel, copper, etc. |
| D. | all of the above |
| Answer» C. nickel, copper, etc. | |
| 576. |
Pick up the wrong statement Nickel and chromium in steel help in |
| A. | providing corrosion resistance |
| B. | improving machining properties |
| C. | providing high strength at elevated temperatures |
| D. | raising the elastic limit |
| Answer» C. providing high strength at elevated temperatures | |
| 577. |
Pick up the wrong statement |
| A. | aluminium in steel results in excessive grain growth |
| B. | manganese in steel induces hardness |
| C. | nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility |
| D. | tungsten in steels improves magnetic properties and hardenability |
| Answer» B. manganese in steel induces hardness | |
| 578. |
Railway rails are normally made of |
| A. | mild steel |
| B. | alloy steel |
| C. | high carbon |
| D. | tungsten steel |
| Answer» D. tungsten steel | |
| 579. |
In which of the following cases, consideration of creep is important |
| A. | flywheel of steam engine |
| B. | cast iron pipes" |
| C. | cycle chains |
| D. | gas turbine blades |
| Answer» E. | |
| 580. |
Corrosion resistance of steel is increased by addition of |
| A. | chromium and nickel |
| B. | sulphur, phosphorus, lead |
| C. | vanadium, aluminium |
| D. | zinc. |
| Answer» B. sulphur, phosphorus, lead | |
| 581. |
Maximum percentage of carbon in austenite is |
| A. | 0.025% |
| B. | 0.26% |
| C. | 0.8% |
| D. | 1.7%. |
| Answer» E. | |
| 582. |
'Killed steels' are those steels |
| A. | which are destroyed by burning |
| B. | which after their destruction are recycled to produce fresh steel |
| C. | which are deoxidised in the ladle with silicon and aluminium |
| D. | in which carbon is completely burnt |
| Answer» D. in which carbon is completely burnt | |
| 583. |
Annealing of white cast iron results in production of |
| A. | malleable iron |
| B. | nodular iron |
| C. | spheroidal iron |
| D. | grey iron |
| Answer» B. nodular iron | |
| 584. |
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 | |
| 585. |
An important property of high silicon (12 - 18%) cast iron is the high |
| A. | tenacity |
| B. | brittleness |
| C. | plasticity |
| D. | hardness. |
| Answer» E. | |
| 586. |
In mottled cast iron, carbon is available in |
| A. | free form |
| B. | combined form |
| C. | nodular form |
| D. | partly in free and partly in combined state. |
| Answer» E. | |
| 587. |
White cast iron contains carbon in the form of |
| A. | free carbon |
| B. | graphite |
| C. | cementite |
| D. | white carbon |
| Answer» D. white carbon | |
| 588. |
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as |
| A. | allotropic change |
| B. | recrystallisation |
| C. | heat treatment |
| D. | precipitation |
| Answer» B. recrystallisation | |
| 589. |
Iron is |
| A. | paramagnetic |
| B. | ferromagnetic |
| C. | ferroelectric |
| D. | dielectric |
| Answer» C. ferroelectric | |
| 590. |
Wrought iron is |
| A. | hard |
| B. | high in strength |
| C. | highly resistant to corrosion |
| D. | lease resistant to corrosion |
| Answer» D. lease resistant to corrosion | |
| 591. |
In malleable iron, carbon is present in the form of |
| A. | cementite |
| B. | free carbon |
| C. | flakes |
| D. | nodular aggregates of graphite. |
| Answer» E. | |
| 592. |
In nodular iron, graphite is in the form of |
| A. | cementite |
| B. | free carbon |
| C. | flakes |
| D. | spheroids |
| Answer» E. | |
| 593. |
The unique property of cast iron is its high |
| A. | malleability |
| B. | ductility |
| C. | surface finish |
| D. | damping characteristics |
| Answer» E. | |
| 594. |
Pig iron is the name given to |
| A. | raw material for blast furnace |
| B. | product of blast furnace made by reduction of iron ore |
| C. | iron containing huge quantities of carbon |
| D. | iron in molten form in the ladles |
| Answer» C. iron containing huge quantities of carbon | |
| 595. |
The percentage of carbon in grey iron castings usually varies between |
| A. | 0.5 to 1% |
| B. | 1 - 2% |
| C. | 2.5 to 4.5% |
| D. | 5 - 7% |
| Answer» D. 5 - 7% | |
| 596. |
The metallic structure of mild steel is |
| A. | body centred cubic |
| B. | face centred cubic |
| C. | hexagonal close packed |
| D. | cubic structure |
| Answer» B. face centred cubic | |
| 597. |
The crystal of alpha iron is |
| A. | body centred cubic |
| B. | face centred cubic |
| C. | hexagonal close packed |
| D. | cubic structure |
| Answer» B. face centred cubic | |
| 598. |
The crystal structure of gamma iron is |
| A. | body centred cubic |
| B. | face centred cubic |
| C. | hexagonal close packed |
| D. | cubic structure |
| Answer» C. hexagonal close packed | |
| 599. |
Paramagnetic alpha iron changes to gamma iron at |
| A. | 770°C |
| B. | 910°C |
| C. | 1440°C |
| D. | 1539°C |
| Answer» C. 1440°C | |
| 600. |
Ferromagnetic alpha iron exists in temperature range of |
| A. | below 723°C |
| B. | 770 - 910°C |
| C. | 910-1440°C |
| D. | 1400-1539°C |
| Answer» B. 770 - 910°C | |