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4

An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

A. Chromium

B. Silicon

C. Manganese

D. Magnesium

Correct Answer :

C. Manganese


Related Questions

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An important property of malleable cast iron in comparison to grey cast iron is the high

A. Compressive strength

B. Ductility

C. Carbon content

D. Hardness

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The coordination number of a face centred cubic space lattice is

A. Six

B. Twelve

C. Eighteen

D. Twenty

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Which of the following alloys does not have copper as one of the constituents?

A. Delta metal

B. Monel metal

C. Constantan

D. Nichrome

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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

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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

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4

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

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Cold rolled steel sheets contain carbon of the following order

A. 0.1 %

B. 0.2 %

C. 0.4 %

D. 0.6 %

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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

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4

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

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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

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The hardness of steel increases if it contains

A. Austenite

B. Martensite

C. Pearlite

D. Cementite

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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

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4

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

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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

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Chromium when added to steel __________ the tensile strength.

A. Does not effect

B. Decreases

C. Increases

D. None of these

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Hardness of martensite is about

A. RC 65

B. RC 48

C. RC 57

D. RC 80

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The unit cells

A. Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal

B. Have the same orientation and their similar faces are parallel

C. May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice

D. All of the above

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Austenite is a combination of

A. Ferrite and cementite

B. Cementite and gamma iron

C. Ferrite and austenite

D. Ferrite and iron graphite

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Which of the following statements are true for annealing of steels?

A. Steels are heated to 500 to 700°C

B. Cooling is done slowly and steadily

C. Internal stresses are relieved

D. All of these

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Solder is an alloy consisting of

A. Tin, antimony, copper

B. Tin and copper

C. Tin and lead

D. Lead and zinc

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Tin base white metals are used where the bearings are subjected to

A. Large surface wear

B. Elevated temperatures

C. Light load and pressure

D. High pressure and load

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The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called

A. Duralumin

B. Y-alloy

C. Magnalium

D. Hindalium

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The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

A. Coordination number

B. Atomic packing factor

C. Space lattice

D. None of these

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A small percentage of boron is added to steel in order to

A. Increase hardenability

B. Reduce machinability

C. Increase wear resistance

D. Increase endurance strength

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The basic constituents of Hastelloy are

A. Aluminium, copper etc.

B. Nickel, molybdenum etc.

C. Nickel, Copper, etc.

D. All of the above

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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

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Bronze is an alloy of

A. Copper and zinc

B. Copper and tin

C. Copper, tin and zinc

D. None of these

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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

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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

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Neutral 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