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.
| 501. |
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 |
| Answer» B. Mg, Zn, Ti, Zr, Br, Cd | |
| 502. |
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 |
| Answer» B. equal to 7 | |
| 503. |
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 |
| Answer» B. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg | |
| 504. |
The correct composition of Babbit metal is |
| A. | 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi |
| B. | 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg |
| C. | 87% Sn, 4% Cu, 8% Sb, 1% Al |
| D. | 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg |
| Answer» B. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg | |
| 505. |
Babbit metal is a |
| A. | lead base alloy |
| B. | tin base alloy |
| C. | copper base alloy |
| D. | (a) and (c) above. |
| Answer» E. | |
| 506. |
Foundry crucible is made of |
| A. | mild steel |
| B. | german silver |
| C. | lead |
| D. | graphite. |
| Answer» E. | |
| 507. |
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. | |
| 508. |
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 | |
| 509. |
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 |
| Answer» E. | |
| 510. |
Addition of silicon 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» B. improvement of corrosion resistance | |
| 511. |
Addition of lead and bismuth 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» E. | |
| 512. |
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. | zink |
| D. | nickel |
| Answer» E. | |
| 513. |
Addition of manganese 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» C. one of the best known age and precipitation-hardening systems | |
| 514. |
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 | |
| 515. |
which is false statement about properties of aluminium |
| A. | wear resistance is very good |
| B. | fatigue strength is not high |
| C. | creep strength limits its use to fairly low temperatures |
| D. | corrosion resistance is good. |
| Answer» B. fatigue strength is not high | |
| 516. |
Admiralty gun metal contains |
| A. | 63 to 67% nickel and 30% copper |
| B. | 88% copper, 10% tin and rest zinc |
| C. | alloy of tin, lead and cadmium |
| D. | none of the above |
| Answer» C. alloy of tin, lead and cadmium | |
| 517. |
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 |
| Answer» B. iron, nickel and copper | |
| 518. |
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 |
| Answer» B. contain carbon in free form | |
| 519. |
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. | none of the above |
| Answer» B. 88% copper and 10% tin and rest zinc | |
| 520. |
The alloy used for making electrical resistances and heating elements is |
| A. | nichrome |
| B. | invar |
| C. | magnin |
| D. | elinvar |
| Answer» B. invar | |
| 521. |
Perminvar alloy having constant permeability is an alloy of |
| A. | nickel, copper and iron |
| B. | nickel, copper and zinc |
| C. | copper, nickel and antimony |
| D. | iron, zinc and bismuth |
| Answer» B. nickel, copper and zinc | |
| 522. |
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 |
| Answer» C. 85-92% copper and rest tin with little lead and nickel | |
| 523. |
Aluminium bronze contains aluminium and copper in the ratio of |
| A. | 50 : 50 |
| B. | 40 : 60 |
| C. | 60 : 40 |
| D. | 10 : 90 |
| Answer» E. | |
| 524. |
Structural steel contains following principal alloying elements |
| A. | nickel, chromium and manganese |
| B. | tungsten, molybdenum and phosphorous |
| C. | lead, tin, aluminium |
| D. | zinc, sulphur, and chromium |
| Answer» B. tungsten, molybdenum and phosphorous | |
| 525. |
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 |
| Answer» E. | |
| 526. |
If a refractory contains high content of silicon, it means refractory is |
| A. | acidic |
| B. | basic |
| C. | neutral |
| D. | brittle |
| Answer» D. brittle | |
| 527. |
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 | |
| 528. |
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 | |
| 529. |
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 | |
| 530. |
A specimen of aluminium metal when observed under microscope shows |
| A. | B.C.C. crystalline structure |
| B. | F.C.C. crystal structure |
| C. | H.C.P. structure |
| D. | a complex cubic structure |
| Answer» C. H.C.P. structure | |
| 531. |
The crystal structure of brass is |
| A. | F.C.C. |
| B. | B.C.C. |
| C. | H.C.P. |
| D. | Orthorhombic crystalline structure |
| Answer» B. B.C.C. | |
| 532. |
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 | |
| 533. |
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. | |
| 534. |
Preheating is essential in welding |
| A. | cast iron |
| B. | high speed steel |
| C. | all non-ferrous materials |
| D. | all of the above |
| Answer» B. high speed steel | |
| 535. |
Malleable cast iron |
| A. | contains l.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. | none of the above. |
| Answer» D. none of the above. | |
| 536. |
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. | |
| 537. |
Taps, dies and drills contain carbon |
| A. | below 0.5% |
| B. | below 1% |
| C. | above 1% |
| D. | above 2.2% |
| Answer» D. above 2.2% | |
| 538. |
Pipes for bicycle frames are made of |
| A. | cold rolled steel |
| B. | hot rolled steel |
| C. | forged steel |
| D. | cast steel |
| Answer» B. hot rolled steel | |
| 539. |
Cold rolled steel sheets contain carbon of the following order |
| A. | 0.1% |
| B. | 0.2% |
| C. | 0.4% |
| D. | 0.6% |
| Answer» B. 0.2% | |
| 540. |
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 | |
| 541. |
The machinability of steel is increased by |
| A. | silicon and sulphur |
| B. | phosphorous, lead and sulphur |
| C. | sulphur, graphite and aluminium |
| D. | phosphorous and aluminium |
| Answer» C. sulphur, graphite and aluminium | |
| 542. |
Cupola produces following material |
| A. | cast iron |
| B. | pig iron |
| C. | wrought iron |
| D. | malleable iron |
| Answer» B. pig iron | |
| 543. |
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 | |
| 544. |
The presence of sulphur in pig iron makes |
| A. | it easily machinable |
| B. | it brittle |
| C. | it hard |
| D. | the casting unsound |
| Answer» E. | |
| 545. |
Which of the following elements does not impart hardness to steel |
| A. | copper |
| B. | chromium |
| C. | nickel |
| D. | silicon |
| Answer» B. chromium | |
| 546. |
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 proper¬ties |
| C. | improves cutting ability and reduces hardenability |
| D. | gives ductility, toughness, tensile strength and anticorrosion properties |
| Answer» E. | |
| 547. |
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. | None of the above |
| Answer» B. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable | |
| 548. |
The hardness of steel increases if it contains |
| A. | austenite |
| B. | martensite |
| C. | pearlite |
| D. | cementite |
| Answer» C. pearlite | |
| 549. |
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% | |
| 550. |
Tensile strength of steel can be safely in-creased by |
| A. | adding carbon up to 2.8% |
| B. | adding carbon up to 2.8% |
| C. | adding carbon up to 0.83% |
| D. | adding small quantities of copper |
| Answer» D. adding small quantities of copper | |