4Th Class Power Engineering Chapter 46

Front 1

Malleabillity of a metal usually increases with the addition of

A. Aluminum

B. Heat

C. Molybdenum

D. Copper

Back 1

B. Heat

Front 2

What results from removing nearly all the impurities and carbon from pig iron?

A. Mild steel

B. Cast iron

C. Stainless steel

D. Wrought iron

Back 2

D. Wrought iron

Front 3

Copper will become soft when it is

A. Mixed with wrought-iron

B. Stretched

C. Hammered

D. Heated and cooled quickly in water

Back 3

D. Heated and cooled quickly in water

Front 4

White metal is an alloy of _______ and ________.

A. Copper and zinc

B. Lead and tin

C. Copper and vanadium

D copper and tungsten

Back 4

B. Lead and tin

Front 5

Ability to resist wear, abrasion, cutting and indentation. Ex. Carbon steel and chilled cast iron.

Hardness. Toughness. Ductility. Malleabillity. Brittleness. Stiffness. Plasticity. Elasticity.

Back 5

Hardness

Front 6

Ability to withstand impact or shock. Ex. Wrought iron, wrought steel

Hardness. Toughness. Ductility. Malleabillity. Brittleness. Stiffness. Plasticity. Elasticity.

Back 6

Toughness

Front 7

Ability to be drawn out in tension without breaking. Ex. Mild steel, aluminum

Hardness. Toughness. Ductility. Malleabillity. Brittleness. Stiffness. Plasticity. Elasticity.

Back 7

Ductility

Front 8

Ability to be extended by hammering without fracture. Ex. Copper, aluminum

Hardness. Toughness. Ductility. Malleabillity. Brittleness. Stiffness. Plasticity. Elasticity.

Back 8

Malleabillity

Front 9

Permits no permanent deformation before breaking. Ex. Cast iron

Hardness. Toughness. Ductility. Malleabillity. Brittleness. Stiffness. Plasticity. Elasticity.

Back 9

Brittleness

Front 10

Ability to resist deformation (bending). Ex. Steel

Hardness. Toughness. Ductility. Malleabillity. Brittleness. Stiffness. Plasticity. Elasticity.

Back 10

Stiffness

Front 11

These materials are very soft and easily deformed. Ex. Copper, aluminum

Hardness. Toughness. Ductility. Malleabillity. Brittleness. Stiffness. Plasticity. Elasticity.

Back 11

Plasticity

Front 12

Ability to resume original shape and dimensions after an external load or force acting upon it is removed.

Ex. Wrought iron

Hardness. Toughness. Ductility. Malleabillity. Brittleness. Stiffness. Plasticity. Elasticity.

Back 12

Elasticity

Front 13

________ metals contain iron; ________ metals are metals other than iron or steel.

Back 13

Ferrous, nonferrous

Front 14

Name two common types of Hardness testing machines.

A.

B.

Back 14

A. Brinell tester

B. Rockwell tester

Front 15

In production of cast iron, the percentage carbon in the resulting molten iron is

A. 10%-15%

B. 2%-4%

C. 0%-2%

Back 15

B. 2%-4%

Front 16

brass is primarily a mixture of what two elements?

A.

B.

Back 16

A. Copper

B. Zinc

Front 17

Bronze is mainly an alloy of _____ and _______. It may also contain ______ and ______.

Back 17

Copper and tin.

Zinc and lead

Front 18

Aluminum is formed by electrolasis from _______ ________.

Back 18

Bauxite ore

Front 19

The strength of cast iron depends on:

A) How much copper it contains

B) The amount of lead it contains

C) The amount of lead and copper it contains

D) The proportion of carbon and graphite

E) The proportion of wrought iron

Back 19

D) The proportion of carbon and graphite

Front 20

Bearing metal:

1. Is sometimes called Babbitt metal

2. Is sometimes called white metal

3. Can be heated to any temperature

4. Can be made for different types of service

A) 1, 2, 3

B) 3, 4

C) 1, 2, 4

D) 2, 3, 4

E) 1, 3, 4

Back 20

C) 1, 2, 4

Front 21

Aluminium alloys are used in the construction of:

A) Bearing shells

B) Valves and piping

C) Condenser tubes

D) Internal combustion engine parts

E) Motor casings

Back 21

D) Internal combustion engine parts

Front 22

Medium carbon steel becomes difficult to weld when the carbon content exceeds:

A) 10%

B) 0.35%

C) 0.25%

D) 0.1%

E) 3.5%

Back 22

B) 0.35%

Front 23

When chromium is added to alloy steel, it produces:

A) Increased ductility

B) Improved malleability

C) Improved machinability

D) Increased hardness

E) Increased toughness

Back 23

D) Increased hardness

Front 24

The result of removing nearly all the impurities and carbon from pig iron is:

A) Coke

B) Wrought iron

C) Low carbon steel

D) Steel

E) White cast iron

Back 24

B) Wrought iron

Front 25

Which of the following metals is the most ductile?

A) Chilled cast iron

B) High carbon steel

C) White cast iron

D) Copper

E) High speed steel

Back 25

D) Copper

Front 26

In order to avoid residual stresses after welding, alloy steels:

A) Must be heated after welding

B) Should be heated before, during and after welding

C) Are not affected by carbon content

D) Cannot contain any copper

E) Must contain copper

Back 26

B) Should be heated before, during and after welding

Front 27

Tin based white metal (Babbitt) is composed of:

A) 85% tin, 0.35% lead, 7% copper, 7% antimony

B) 89% lead, 7% tin, 3% copper and 1% antimony

C) 75% tin, 15% lead, 10% copper and 5% silver

D) 75% lead, 9% tin, 10% antimony and 6% arsenic

E) 10% tin, 7% antimony, 75% lead and 7% copper

Back 27

A) 85% tin, 0.35% lead, 7% copper, 7% antimony

Front 28

An element that reduces creep in metal is:

A) Nickel

B) Molybdenum

C) Manganese

D) Vanadium

E) Copper

Back 28

B) Molybdenum

Front 29

Which type of cast iron is the toughest?

A) Dark grey cast iron

B) Malleable cast iron

C) Pig iron

D) White cast iron

E) Wrought iron

Back 29

B) Malleable cast iron

Front 30

Wrought iron:

A) Is produced by annealing

B) Is a non-ferrous metal

C) Is corrosion resistant

D) Is stronger than steel

E) Contains a high percentage of carbon

Back 30

C) Is corrosion resistant

Front 31

In the process of forming iron, limestone is added to:

A) The iron ore in the moulds

B) Make the resulting pig iron more malleable

C) Pig iron moulds

D) Increase the pig iron elasticity

E) The molten iron ore in order to form slag

Back 31

E) The molten iron ore in order to form slag

Front 32

Bismuth, silver and antimony are sometimes found in:

A) Bronze

B) Copper

C) Chrome products

D) Bearing metals

E) Brass

Back 32

D) Bearing metals

Front 33

Copper alloys are:

A) Less resistant to corrosion than copper

B) Harder to machine than copper

C) Not as strong as copper itself

D) Much lower in carbon content than copper

E) Easier to machine than copper itself

Back 33

E) Easier to machine than copper itself

Front 34

Which of the following metals is the most ductile?

A) High carbon steel

B) Copper

C) High speed steel

D) White cast iron

E) Chilled cast iron

Back 34

B) Copper

Front 35

Stainless steel:

A) Has a high carbon content

B) Is not an alloy steel

C) Contains a high percentage of chromium

D) Is corrosion resistant

E) Has a high graphite content

Back 35

D) Is corrosion resistant