1651. The presence of sulphur in pig iron makes__________________?
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A. it hard

B. increases the fluidity

C. it brittle

D. it easily machinable

E. the casting unsound
1652. To avoid an interruption in the flow of a syphon, an air vessel is provided__________________?
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A. at the inlet

B. at the outlet

C. none of the above

D. ay nay point between inlet and outlet

E. at the summit
1653. Ferromagnetic alpha iron exists in temperature range of________________?
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A. 770 910C

B. below 723C

C. 910-1440C

D. above 1539C

E. 1400-1539C

1654. Lead is poured into the joint between two pipes. These pipes may be made of____________________?
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A. concrete

B. asbestos cement

C. vitrified clay

D. cast iron

E. mild steel

1655. The hardness of steel primarily depends on _____________________?
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A. method of manufacture

B. %age of carbon

C. %age of alloying elements

D. shape of carbides and their distribution in iron

E. heat treatment employed

1656. Pick up wrong statement about wrought iron ?
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A. It melts at 1535C

B. It contains carbon of the order of 0 to 0.25%

C. It can be easily forge welded

D. It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

E. It is very soft and ductile

1657. Addition of manganese to aluminium results in__________________?
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A. one of the best known age and precipitation-hardening systems

B. improvement of corrosion resistance

C. improving machinability

D. improvement of casting characteristics

E. none of the above

1658. Ductility of a material can be defined as__________________?
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A. ability to undergo large permanent deformations in compression

B. all of the above

C. ability to recover its original form

D. none of the above

E. ability to undergo large permanent deformations in tension
1659. Cast iron is characterised by minimum of following %age of carbon_________________?
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A. 0.80%

B. 2%

C. 6.3%.

D. 1.30%

E. 0.20%

1660. Which is false statement about annealing. Annealing is done to________________?
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A. soften material

B. relieve stresses

C. permit further cold working

D. harden steel slightly

E. improve machining characteristic

1661. Killed steels are those steels__________________?
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A. which are deoxidised in the ladle with silicon and aluminium

B. which are destroyed by burning

C. which after their destruction are recycled to produce fresh steel

D. in which carbon is completely burnt

E. which have poor properties due to improper manufacturing

1662. Perminvar alloy having constant permeability is an alloy of________________?
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A. nickel, copper and zinc

B. iron, zinc and bismuth

C. copper, nickel and antimony

D. antimony, copper and zinc

E. nickel, copper and iron
1663. The most effective inhibitor of grain growth, when added in small quantities is__________________?
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A. cobalt

B. vanadium

C. copper

D. manganese

E. carbon

1664. The units of kinematic viscosity are____________________?
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A. kg sec/metre

B. newton-sec per metre

C. none of the above

D. newton-sec per metre

E. metres2 per sec
1665. Large forgings, crank shafts, axles normally contain carbon up to________________?
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A. 0.20 to 0.45%

B. 0.55 to 1.0%

C. 0.05 to 0.20%

D. 0.45 to 0.55%

E. 1.0 to 1.2%.

1666. The value of mass density in kgsecVm4 for water at 0C is_________________?
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A. 91

B. 101.9

C. 1

D. 1000

E. 100

1667. Increase in pressure at the outer edge of a drum of radius R due to rotation at corad/sec, full of liquid of density p will be___________________?
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A. 2pa2R2

B. pco2/?2/2

C. none of the above

D. pco2/?2

E. pa2R/2

1668. Nodular iron has____________________?
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A. good fluidity

B. high maehinability

C. high tensile strength

D. low melting point

E. all of the above
1669. Bell metal contains_____________________?
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A. 70-75% copper and rest tin

B. 70-75% copper and rest zinc and tin

C. 70% copper and 30% zinc

D. 85-92% copper and rest tin with little lead and nickel

E. 90% copper and 10% tin

1670. Cold rolled steel sheets contain carbon of the following order___________________?
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A. 0.80%

B. 0.60%

C. 0.20%

D. 0.1%

E. 0.40%

1671. Ratio of inertia force to elastic force is known as__________________?
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A. none of the above

B. Froude number

C. Reynolds number

D. Webers number

E. Mach number
1672. Ductile cast iron___________________?
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A. none of the above

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. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

E. 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
1673. The percentage of carbon in pig iron varies from___________________?
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A. 4.5 to 6.3%.

B. 4 to 4.5%

C. 1.5 to 2.5%

D. 0.1 to 1.2%

E. 2.5 to 4%

1674. The crystal structure of gamma iron is_________________?
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A. body centred cubic

B. orthorhombic crystal

C. hexagonal close packed

D. face centred cubic

E. cubic structure

1675. Cemented carbide tools are not found to be suitable for cutting_______________?
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A. non-ferrous alloys.

B. steel

C. aluminium

D. cast iron

E. brass

1676. The following types of materials are usually the most ductile__________________?
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A. all of the above

B. hexagonal close-packed lattice

C. face-centred cubic lattice

D. none of the above

E. body-centred cubic lattice

1677. Blast furnace produces following by reduction of iron ore_______________?
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A. white iron

B. pig iron

C. cast iron

D. wrought iron

E. malleable iron

1678. Which is false statement about normalizing. Normalizing is done to _________________?
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A. reduce segregation in casting

B. improve mechanical properties

C. induce stresses-

D. relieve internal stresses

E. refine grain structure

1679. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as_________________?
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A. center of pressure

B. none of the above

C. meta center

D. center of buoyancy

E. center of gravity

1680. The transistor is made of___________________?
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A. germanium

B. gold

C. copper

D. german silver

E. silver

1681. Corrosion resistance of steel is increased by adding__________________?
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A. chromium and nickel

B. none of the above

C. nickel and molybdenum

D. tungsten and sulfur

E. aluminium and zinc

1682. Acidic solution is one which has pH value__________________?
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A. equal to 7

B. none of the above

C. greater than 7

D. less than 7

E. pH value has nothing to do with neutral solution

1683. Tungsten in steel________________?
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A. raises its melting point

B. gives ductility, toughness, tensile strength and anticorrosion properties

C. improves wear resistance, cutting ability and toughness

D. improves cutting ability and reduces hardenability

E. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
1684. Which of the following is used for bearing liner_______________?
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A. bronze

B. gun metal

C. brass

D. bell metal

E. babbit metal
1685. High carbon steel carries carbon %age c_________________?
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A. 0.8 to 1.5%

B. 0.6 to 0.8%

C. 0.1 to 0.3%

D. 1.5 to 2.5%.

E. 0.3 to 0.6%

1686. Super conduction by metals is observed in the temperature range of_________________?
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A. around 0C

B. around 100C

C. above 100K

D. above 1000C

E. below 10K
1687. A cold chisel is made of_______________?
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A. mild steel

B. high carbon

C. H.S.S.

D. cast iron

E. german silver

1688. Which of the following meters is not associated with viscosity____________________?
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A. Engler

B. Orsat

C. Say bolt

D. none of the above

E. Red wood

1689. Heavy duty leaf and coil spring* contain carbon of the following order ________________?
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A. 1.5%.

B. 1.0%

C. 0.80%

D. 0.50%

E. 0.20%

1690. Dynamic viscosity of most of the liquids with rise in temperature__________________?
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A. none of the above

B. remains unaffected

C. unpredictable

D. increases

E. decreases
1691. Corrundum contains more than 95% _____________________?
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A. MgO

B. Si02

C. steel

D. A1203

E. german silver

1692. Hardness of upper bainite (acicular structure) is about___________________?
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A. RC 57

B. RC 32.

C. RC 80

D. RC 65

E. RC 48
1693. The percentage of carbon in grey iron castings usually varies between __________________?
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A. 2.5 to 4.5%

B. 5 7%

C. 0.5 to 1%

D. 1 2%

E. 7-9%.

1694. German silver contains_________________?
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A. 100% silver

B. 10% silver

C. 1% silver

D. 2.5% silver

E. 5% silver
1695. In grey cast iron, carbon is present in the form of____________________?
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A. cementite

B. free carbon

C. nodular aggregates of graphite

D. flakes

E. spheroids

1696. When a body floating in a liquid, is displaced slightly, it oscillates about _________________?
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A. center of pressure

B. center of buoyancy

C. liquid surface

D. e.g. of body

E. metacentre
1697. Mercury does not wet glass. This is due to property of liquid known as__________________?
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A. compressibility

B. cohesion

C. viscosity

D. adhesion

E. surface tension
1698. A balloon lifting in air follows the following principle_____________________?
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A. continuity equation

B. all of the above

C. Archimedes principle

D. principle of buoyancy

E. law of gravitation

1699. Which one of the following metals would work-harden more quickly than the others__________________?
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A. lead

B. aluminium

C. copper

D. brass

E. silver

1700. Age-hardening is related with______________?
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A. duralumin

B. german silver

C. cast iron

D. gun metal

E. stainless steel