Posted by: novembri yusuf | November 8, 2007

Question Paper 8

1 Bs 499 part II communicates by the use of symbols the type of joint preparation to be used. Listed below are four symbols: which of these indicates the depth of penetration of the weld required on the joint.

2 Which of the following symbols would indicate that a weld has to be finished flush on the other side of the weld

3 what two factors in arc welding must be in equilibrium to enable a stable arc to be established
A arc voltage
B current
C wire /electrode feed rate
D metal burn off rate

4 in mma welding what parameter is used for the control of penetration into the base material
A voltage
B welding speed
C iron powders in the coating
D current

5 in the welding of a butt joint made from one side which of the following controls the profile of the root bead
A root face
B bevel angle
C root gap
D none of the above

6 what type of power source characteristic is required for manual welding
A constant voltage
B flat characteristic
C drooping characteristic
D motor generator

7 which one of the following destructive tests would indicate the toughness of weld parent metal – haz
A macro
B nick break
C hardness
D charpy v notch

8 degreasing components is essential for quality welding but some agents may
A cause corrosion problems
B gives off phosgene gas
C leaves residuals
D all of the above

9 which of the following chemical elements has the greater effect on the hardenability of steel plate
B chromium
C titanium
D carbon

10 in mag / co2 welding which parameters give the greatest control of weld appearance during dip transfer or short circuit welding
A wire stick out length
B amperage
C wire feed speed
D inductance

11 in mma welding the slags produced can be varied to suit the welding position which type of slag would be required for welding in the hv position
A fluid
B viscous
C none of the above
D semi fluid

12 the weld metal deposit of mma electrodes achieves its mechanical strength through
A the core wire
B the flux coating
C iron powders with the flux coating

13 what constituent is needed in a coating to prevent the formation of porosity when welding rimming steel
A iron powders
B calcium fluoride
C silicon
D calcium carbonate
14 welds made with high heat inputs show a reduction in one of the following properties
A ductility
B toughness
C fatigue strength
D mechanical strength

15 in the welding of austenitic pipe work the bore is usually purged with argon to
A prevent the formation porosity in the weld
B prevent burn through in the root run
C prevent oxidation of the root bead
D eliminate the formation of hydrogen

16 in x-ray work the quality of the image is assessed by the
A density of the film
B iqi indicator
C kva available
D stand off distance

17 a steel described as qt will have improved tensile properties because it has
A had control of chemical composition
B been heat treated
C been quality tested
D been vacuum melted

18 which one of the following type of steels would give rise to the formation of porosity when autogenously welded with an arc process
A fully killed steel
B semi killed steel
C rimming steel
D fine-grained steel

19 in submerged arc welding the use of excessively high voltage would result in
A insufficient flux melting
B excessive flux melting
C slag removal difficulties
D spatter

20 the use of cellulosic electrodes is often made when welding root pass of pipes in the field
A hydrogen control is needed
B iron powders in the elecrode
C higher arc voltage can be obtained
D shorter arc lrngth can be achieved

21 in the welding of austentic stainless steels the electrode and the plate material can be purchased with low carbon contents the reason for this is to prevent
A cracking in the haz
B the formation of chromium carbides
C cracking in the weld material
D distortion

22 submerged arc fluxes can be supplied in two forms these are
A sintered and agitated
B agitated and fsued
C crushed and agglomerated
D fused and agglomeraterd

23 in a steel which has improved creep properties at an elevated temperature whish one of the following elements helps in this improvement
A tungsten
B manganese
C molybdenum
D carbon

24 welding a steel plate of ceq of .45 would require preheating to
A prevent formation of sulphides
B prevent hardening in the haz
C prevent formation for carbides
D to improve mechanical properties of the weld

25 which one of the following process uses the keyholing system of fusion
B diffusion bonding
C electron beam welding
D autogenous tig welding

26 in friction welding is the metal at the interface in the
A liquid state
B solid state
C plastic state
D elastic state

27 welding procedures may require weld to be deposited at a controlled rate of heat input high heat inputs would
A have poor profile
B have larger grain size
C have high hardness in the haz
D have low elongation properties

28 in a tensile test a brittle material would be indicated if the fracture surface
A shows areduction in size
B is flat and featureless
C breaks in the weld metal
D breaks in the parent metal

29 what destructive test would be required to ascertain the likelihood of cracking in the haz of a weld
A nick break
B side bend test
C charpy impact
D macro test

30 in submerged arc welding excessive arc voltage may cause
A excessive penetration
B change in weld metal properties
C narrow weld width
D excessive bead profile

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