MODULE 20, CWB: STRUCTURE and
PROPERTIES of METALS
1 The electron can be shared between atoms. - ANS1. COVALENT BOND, pg 6
2. In a welding arc a big variety of ions are created, certain factors with low ionization capacity
may be added to facilitate organising a solid arc, or plasma. Among most of these elements
which one is the most presence in many electrode coatings ?
A. Helium
b. Oxygen
c. Aluminum
d. Potassium - ANS2. Solution D, desk 3.1
three. An atom inside the charged state is known as ? - ANS3. Ion sect.3.1
4. Which one these cloth that has the bottom "work function" ?
A. Tungsten
b. Nickel
c. Iron
d. Thoria - ANS4. Answer d,Thoria Table 3.2
five. Some metals, excellent iron, can exist in one-of-a-kind crystal bureaucracy depending at
the temperature. These are termed allotropic paperwork. What is the iron structure among 910
C - 1390 C ?
A. BCC
b. FCC
c. Liquid
d. HCP - ANS5. Answer b, FCC, sect four.2
6. Most metals are chemically unstable as natural elements, and exist in their natural nation as
oxide or sulphide ores. Iron for example, exists within the natural nation in usual ores which
include ? - ANS6. Magnetite and hematite. Pg2
7. The places in which the ordinary crystal pattern of atoms breaks down and there is a local
distortion as the surrounding atoms attempt to fit the right pattern.
A. Dislocations
b. Slips
c. Yields
d. Distortions - ANS7. A. Dislocations, sec.5.1.1
, eight. These 3 factors, H, C and N are especially important in welding because they may be
soluble in lots of metals and can be the purpose of cracking, embrittlement and different issues.
A. Solid Solutions
b. Interstitial Solutions
c. Both a and b - ANS8. B Interstitial Solutions, sect 6.1.2
9. What is the snap shots of dating of labor hardening coefficient among pressure and stess ?
A. Parabolic
b. Straight line
c. Flat Line
d. Constant cost - ANS9. A. Parabolic. Fig.7.1
10. A eutectoid response is similar to eutectic reaction, but it takes place in the ---------- in
preference to --------?
A. Strong, fuel
b. Solid, liquid
c. Liquid, fuel
d. Liquid, solid - ANS10. Answer b; sect 6.2.2.1
eleven. Which alloy elements used in metal that has the best strengthening impact ?
A. Chromium
b. Copper
c. Carbon
d. Nickel - ANS11. Answer C, fig 8.2
12. Of all of the strengthening strategies available which one which simultaneously improves
power and sturdiness ?
A. Grain refinement
b. Precipitation hardening
c. Strain ageing
d. Solid answer stregthening - ANS12. Answer A, sect 8.Four.1
thirteen. Effect of thickness on cooling rate at the thick plate does now not depend upon the
thickness.
True or False ? - ANS13. Asnwer True. Sect 11.3.2.Four
14. Heat enter on a 12 mm steel plate cools ----------instances more quickly than one for six mm
plate.
A. The equal rate
b. Two
c. 4
d. Some - ANS14. Solution C, sect eleven.3.2.4
PROPERTIES of METALS
1 The electron can be shared between atoms. - ANS1. COVALENT BOND, pg 6
2. In a welding arc a big variety of ions are created, certain factors with low ionization capacity
may be added to facilitate organising a solid arc, or plasma. Among most of these elements
which one is the most presence in many electrode coatings ?
A. Helium
b. Oxygen
c. Aluminum
d. Potassium - ANS2. Solution D, desk 3.1
three. An atom inside the charged state is known as ? - ANS3. Ion sect.3.1
4. Which one these cloth that has the bottom "work function" ?
A. Tungsten
b. Nickel
c. Iron
d. Thoria - ANS4. Answer d,Thoria Table 3.2
five. Some metals, excellent iron, can exist in one-of-a-kind crystal bureaucracy depending at
the temperature. These are termed allotropic paperwork. What is the iron structure among 910
C - 1390 C ?
A. BCC
b. FCC
c. Liquid
d. HCP - ANS5. Answer b, FCC, sect four.2
6. Most metals are chemically unstable as natural elements, and exist in their natural nation as
oxide or sulphide ores. Iron for example, exists within the natural nation in usual ores which
include ? - ANS6. Magnetite and hematite. Pg2
7. The places in which the ordinary crystal pattern of atoms breaks down and there is a local
distortion as the surrounding atoms attempt to fit the right pattern.
A. Dislocations
b. Slips
c. Yields
d. Distortions - ANS7. A. Dislocations, sec.5.1.1
, eight. These 3 factors, H, C and N are especially important in welding because they may be
soluble in lots of metals and can be the purpose of cracking, embrittlement and different issues.
A. Solid Solutions
b. Interstitial Solutions
c. Both a and b - ANS8. B Interstitial Solutions, sect 6.1.2
9. What is the snap shots of dating of labor hardening coefficient among pressure and stess ?
A. Parabolic
b. Straight line
c. Flat Line
d. Constant cost - ANS9. A. Parabolic. Fig.7.1
10. A eutectoid response is similar to eutectic reaction, but it takes place in the ---------- in
preference to --------?
A. Strong, fuel
b. Solid, liquid
c. Liquid, fuel
d. Liquid, solid - ANS10. Answer b; sect 6.2.2.1
eleven. Which alloy elements used in metal that has the best strengthening impact ?
A. Chromium
b. Copper
c. Carbon
d. Nickel - ANS11. Answer C, fig 8.2
12. Of all of the strengthening strategies available which one which simultaneously improves
power and sturdiness ?
A. Grain refinement
b. Precipitation hardening
c. Strain ageing
d. Solid answer stregthening - ANS12. Answer A, sect 8.Four.1
thirteen. Effect of thickness on cooling rate at the thick plate does now not depend upon the
thickness.
True or False ? - ANS13. Asnwer True. Sect 11.3.2.Four
14. Heat enter on a 12 mm steel plate cools ----------instances more quickly than one for six mm
plate.
A. The equal rate
b. Two
c. 4
d. Some - ANS14. Solution C, sect eleven.3.2.4
