welding questn
TRANSCRIPT
www.proprofs.com/quiz-school/story.php?title=gate-2012Question Excerpt From WELDING TECHNOLOGY SET 1Q.1) open circuit voltage for arc welding is of the order of..
A. 18-40 volts
B. 40-95 volts C. 100-125 volts D.
30-170 volts
Q.2) two sheets of same material but different thickness can be butt welded by ----
A.
adjustment of the current
B. time duration of current C. pressure applied D.
changing the size of one electrode
Q.3) preheating is essential in welding ---
A. high speed steel B. german silver C. stainless steel D. cast iron
Q.4) cross wire welding is----
A.
used to form mesh
B.
multi spot welding process
C. used where additional strength is required D. continuous spot welding process
Q.5) which of the following welding process uses non-consumable electrode?
A. LASER welding B.
MIG welding
C. TIG welding D. ion beam welding E.
plasma welding
Q.6) joggled welding joint are used ----
A. to join 2 pieces of metal in the same manner as rivet joint metals B.
where longitudinal shear is present
C.
there is nothing called joggled welding
D. where service loading is encountered and the upper surface of both pieces must be in the same plane.
Q.7) The temp of the plamsa torch is of order of ---
A.
1,000 deg C
B. 10,000 deg C C. 33,000 deg C D.
5,000 deg C
Q.8)
ARC length in arc welding should be nearly equal to
A. dia of electrode (d) B.
2d
C.
3d
D.
4d
Q.9) the max_m amt of current necessary in resistance welding is of order of ----
A.
4.5-6.2 KVA/cm2
B.
1-2 KVA/cm2
C.
6.5-7.9 KVA/cm2
D. 2.5 KVA/cm2 Q.10)
Low hydrogen electrodes are baked prior to use in order that----
A. welding is free from moisture pick up B. proper strength is obtained C. current required is minimum D.
welding is free from arc blow
Q.11) electrode gets consumes in which of the following welding process ?
A.
thermit
B. gas C.
arc
D. resistance Q.12) if 't' is the thickness of sheet to be spot welded ,the electrode tip diameter is equal to....
A. 2.5�t
B. 2�t
C. 1.5�t
D.
�t
Q.13) brazing process is carried out in the temperature range of ---
A. 150-250 deg C B. 250-450 deg C C. 500-700 deg C D. 700-900 deg C
Q.14) entrapped fluxes , during brazing result in ----
A. cracking B.
presence of gas pockets
C.
distorsion of joints
D.
corrosion
Q.15) binding wire used to support the joint for soldering is made of ----
A. soft iron B. aluminium C.
mild steel
D.
copper
Q.16)
Plug weld joint is used----
A.
where longitudinal shear is present
B. where serve loading is encountered and upper surfaces of both pieces must be in the same plane. C. to join 2 pieces of metals in the same manner as rivet joint metals D. there is notning like pluge weld joint
Q.17)
In forehand gas welding operation , the angle between the torch and workpiece is kept around--
A.
60 degree
B.
30 degree
C.
75 degree
D.
45 degree
Q.18)
Thermit welding is a form of---
A.
fusion welding
B. resistance welding C.
forge welding
D. gaswelding E. arc welding
Q.19)
The arc in atomic hydrogen welding takes place between the ---
A. non-consumable tungsten electrode and workpeice B.
parents metals
C. consumable tungsten electrode and filler rod D.
consumable tungsten electrode and workpeice
E. 2 tungsten electrode Q.20) Distortion in welding occurs due to ---
A.
use of wrong electrode
B.
use of excessive current
C.
oxidation of weld pool
D. improper clamping method E. improper composition of parent material
Q.21)
submerged arc welding is ---
A a process which uses a mix of iron oxide and granular of aluminium
. B.
accomplished by maintaining a hot molten metal pool between plates
C.
a process in which arc is maintained under a blanket of flux
D. all of these Q.22)
the vacuum of which of the following order is maintained in EBW process ?
A.
1 torr
B. 10-2 torr C. 10-3 torr D. 10-5 torr
Q.23)
The electroslag welding is ---
A.
a process which uses a mixture of iron oxide and granular aluminium
B. accomplished by maintaining a hot metal pool between plates C. a process in which arc is maintained under a blanket of flux. D. there is nothing called electoslag.
Q.24) acetylene gas is generated from ---
A.
carbon
B. calcium C. calcium carbonate D. calcium chloride E. calcium carbide
Q.25)
The flux in brazing process is used in the form of ----
A. solid B.
liquid
C. gas D. all of the above
Q.26)
steel balls are manufactured by ---
A. casting B. machining C.
cold heating
D. sintering E. spinning
Q.27) after cold forming , steel balls are subjected to ---
A. normalising B. tempering C.
electroplating
D. stress relieving E. artificial aging
Q.28)
The steel billets for extrusion are heat in the range of ----
A. 1100-1200 degree C B. 1000-1100 degree C C 700-1000 degree C
. D. 1400-1500 degree C
Q.29) External screw threads can be produced fast by ----
A. milling B. chasing C. casting D. rolling E. automats
Q.30) Which of the following operation is different from the rest -----
A.
riveting
B. embossing C.
punching
D. coining E. flattening
Q.31)
carbon arc welding is ---
A.
a process which uses a mixture of iron oxide and granular aluminium
B.
accomplished by maintaining a hot molten metal pool between plates
C.
a process in which arc is maintained under a blanket of flux
D.
used to weld carbon rods
Q.32)
Too slow welding speed in arc welding would result in ---
A. excessive piling of weld metal ,poor penetration,wested electrodes B. excessive spatter,under cut along edges,irregular deposits,wasted electrodes C.
too small bead,weak weld and wasted electrodes
D.
excessive piling of weld metal ,overlaping without penetration of edges,wested electrodes
E.
none of these
Q.33)
The welding of stainless steel is difficult because ----
A.
rust formation takes place
B.
high melting point of stainless steel
C.
formation of oxide film
D.
formation of chromium carbide
E. fear of cracking Q.34)
Filler material in welding should have ----
A.
same composition as the parrent metal to be welded
B. same melting temperature as the parrent metal to be welded C. same composition and same melting point as the parrent metal to be welded D same composition as of electrode
. E.
melting point much lower than the melting point of parrent metal
Q.35) Filler metal is used in ---
A. electric spot welding B.
seam welding
C.
projection welding
D.
continuous welding
E.
none of these
Q.36) In which of the following welding process a disposable ceramic ring is placed around the joint ?
A. Stud welding B.
Percussion welding
C. Upset welding D. Projection welding E.
Resistance spot welding
Q.37)
Pure tungsten electrode is used only for ----
A. AC high frequency B.
DC high frequency
C. AC low frequency D. DC low frequency
Q.38)
1% thoriated tungsten electrode is used for joining of ---
A. Copper to copper alloy B. steel to steel alloy C. for all metal alloy D.
none
Q.39) In which of the following process capacitor is used to store elctrical energy ?
A.
Percussion welding
B. Stud welding C. Upset welding D. Ultrasonic welding
Q.40)
The temperature generated in thermit welding is ---
A.
3000°
B.
5000°
C.
4000°
D. 33000° Q.41) Which of the following carbon equivalent in steel is considered exellent for weldability ?
A. upto 0.35 B.
0.36-0.40
C.
0.41-0.45
D.
0.46-0.50
Question Excerpt From WELDING TECHNOLOGY SET 2Q.1) The usu"l co¡¢osition of soldering "lloys is---
A.
tin and copper
B.
tin ,copper and lead
C. tin ,lead and small % of antimony D. tin and lead
Q.2) The co¡¢osition of silver solder is----
A. silver ,copper , zinc B.
silver ,lead ,tin
C. silver ,lead ,zinc D.
silver ,tin ,nickel
Q.3) fluxes "re used in welding in order to ¢rotect the ¡olten ¡et"l "nd the surf"ces to be jointed fro¡---
A. oxidation B. carburizing C.
dirt
D.
distrotion and warping
E. unequal temperature distribution Q.4) The ¢ri¡"ry volt"ge used in sub¡erged Arc furn"ce is---
A. 33KV B.
38 KV
C.
40 KV
D.
22 KV
Q.5)
Co¢¢er is ---
A.
as good for spot welding as any other material
B.
easily spot welded
C.
prefered to be welded by spot welding
D.
very difficult to be spot welded
Q.6) se"¡ welding is ----
A.
used to form mesh
B.
multi-spot welding process
C. used for welding cylindrical objects D. continuous spot welding process
Q.7) weld s¢"tter is ---
A.
welding defect
B. flux C. welding test D. electrode coating E. welding technique
Q.8)
Too f"st welding s¢eed in "rc welding would result in ---
A. excessive piling up of weld metal ,poor penetration ,wasted electrodes. B. excessive spatter ,under cutting along edges ,iregular deposits,wasted electrodes. C. too small bead ,weak weld and wasted electrodes D. excessive piling up of weld metal ,overlaping without penetration of edges ,wasted electrodes.
Q.9) Arc st"bility is better with---
A.
both AC and DC welding
B. AC welding C.
specially designed wave forms
D. DC welding E.
rectified supply
Q.10) In resist"nce welding the electrode ¡"teri"l is ¡"de of ---
A.
carbon steel
B. stainless steel C.
copper
D. high speed steel E. graphite
Q.11)
which of the following ¡"teri"l is best cut by oxy-cutting ¢rocess?
A. brass B.
copper
C.
bronze
D. stainless steel E. mild steel
Q.12)
In which of the following welding techniques ,the fl"¡e of the torch is directed "g"inst the co¡¢lete weld?
A. overhead welding B.
horizontal welding
C.
forhead welding
D.
backhand welding
E. is never done Q.13)
¡et"l like br"ss "nd co¢¢er c"n be welded by---
A. oxidising flame B. carburizing flame C. neutral flame
D.
any of the above flame
Q.14) solder is essenti"lly "---
A.
tin silver base
B. tin lead base C. tin bismuth base D. silver lead base E.
bismuth lead base
Q.15) the ¢ur¢ose of using bor"x in br"zing is to
A. replace flux B.
dissolve oxides when heating the work
C.
accelerate the formation of oxides on the work
D.
prevent the spelter from melting too quickly
E. increase fluidity of braze material. Q.16) In the "rc welding , eyes need to be ¢rotected "g"inst---
A.
intense glaze
B.
sparks
C.
infra-red rays
D. ultra-voilet rays E. infra-red rays and ultra-voilet rays
Q.17) In which ty¢e of welding " ¢ool of ¡olten ¡et"l is used---
A. electroslag B. submerged arc C. MIG D.
TIG
E.
thermit welding
Q.18)
The ¡"in criterion for selection of electrode di"¡eter in "rc welding is--
A.
material to be weld
B. type of welding process C. thickness of material D. voltage used E.
current used
Q.19)
In "rc welding ,"rc is cre"ted between the "rc cre"ted between the electrode "nd work by
A. flow of current B.
voltage
C. material characteristics D.
contact resistance
E. electrical energy
F.
?
Q.20)
The ¡"teri"l used for co"cting the electrode is c"lled---
A. protective layer B.
binder
C.
slag
D. deoxidiser E.
flux
Q.21) s¢elter is s"¡e "s ---
A.
tin
B.
zinc
C. lead D. brass
Q.22) zinc chloride is used in --
A. tempering B.
annealing
C.
brazing
D. hardening E.
soft soldering
Q.23)
soldering iron is ¡"de to wedge sh"¢e in order to ---
A. apply high pressure at edge B.
retain heat
C. retain solder D.
facilitate molecular attraction
E. none of the above Q.24)
st"inless steel is welded using ---
A.
oxy-acetylene flame
B.
oxy-hydrogen flame
C. arc welding D. inert gas arc welding
Q.25)
which of the following st"te¡ent is correct "bout the function of flux in br"zing ?
A.
none of the above
B. surface tension and molecular attraction C. gravitation force D. ionization of space between the electrode and work piece
Q.26)
the ¢heno¡enon of weld dec"y occurs in ---
A. cast irons B. brass C.
bronze
D. stainless steel E. carbon steel
Q.27) we"ving in "rc welding refers to ---
A.
side to side motion of electrode at the right angles to the direction of welding
B.
side to side motion of electrode along the direction of welding
C. spiral motion given to electrode D. a technique of striking the arc E.
arc blow action due to electromagnetic force
Q.28)
Arc blow occurs in ----
A. gas welding B. gas cutting C. arc welding when stright polarity (SP) is used D. arc welding when reverse polarity (RP) is used E. welding stainless steel
Q.29) Grey iron is usu"lly welded by ---
A. Gas welding B. arc welding C. resistance welding D. TIGwelding E.
MIG welding
Q.30) stud "nd ¢rojection welding belongs to which of the following c"tegory of welding ----
A. Gas welding B. arc welding C. resistance welding D.
pressure welding
E.
thermit welding
Q.31) Welding ¢rocess used for joining round w"r is ---
A.
spot welding
B.
projection welding
C.
seam welding
D.
none of these
Q.32)
Se"¡ welding used for ¡et"l sheets h"ving thickness in the r"nge of ----
A.
0.025 to 3 mm
B. 3 to 6 mm C. 6 to 10 mm D. more than 10 mm
Q.33) Welding of steel structure on site of " building i" done by ---
A.
spot welding
B.
projection welding
C.
seam welding
D. arc welding Q.34)
In electric"l resist"nce welding ----
A.
voltage is high and current is low
B.
voltage is low and current is high
C. both voltage and current are high D. both voltage and current are low
Q.35)
¢l"in "nd butt welds c"n be used h"ving thickness "¢¢roxi¡"tely ---
A.
25 mm
B.
40 mm
C.
50 mm
D. 100 mm Q.36) Acidic flux h"ving b"sicity index ----
A. 0.8-1.2 B. 0.5-0.8 C. 1.2-2.5 D. 2.5-4.0
Q.37)
Neutr"l fluxes h"ving b"sicity index ----
A. 0.8-1.2 B. 0.5-0.8 C. 1.2-2.5 D. 2.5-4.0
Question Excerpt From WELDING TECHNOLOGY SET 3Q.1) the ¡elting ¢oint of filler ¡et"l in br"zing should be "bove ---
A.
450 degree C
B.
600 degree C
C.
800 degree C
D.
900 degree C
Q.2)
In reverse ¢ol"rity (RP) welding ----
A.
work is positive and holder is earthed
B.
holder is positive and work is earthed
C.
work is negative and holder is earthed
D.
electrode holder is connected to the negative and work to positive
E. electrode holder is connected to the positive and work to negative Q.3) In ther¡it welding ,the iron oxide "nd "lu¡iniu¡ oxide "re ¡ixed in ¢ro¢ertion of ---
A. 1:1 B. 1:3 C. 3:1 D.
not fixed
Q.4) The flux in sub¡erged "rc welding is in the for¡ of ----
A.
coating on the electrodes
B. core wires C. granules D.
an inert gas
E. paste Q.5) oxygen to "cetylene r"tio in c"se of c"rburising fl"¡e is ---
A.
0.5:1
B.
0.9:1
C. 1:1 D.
1:1.2
Q.6)
Acetylene is stored in g"s cylinders---
A. in gaseous form B.
in liquid form
C.
in solid form
D. under pressure E.
under low pressure
Q.7) The surfece cr"cks in the weld¡ent of non-¡"gnetic "lloys c"n be ins¢ected by ----
A. X-ray test B. ultrasonic testing C. fluoresecent test D. magnaflux method
Q.8)
Which of the following h"s the lowest ¡elting ¢oint ----
A. brazing spatter B.
copper
C.
soft solder
D. silver solder E.
aluminium
Q.9) He"t for soldering is su¢¢lied by ---
A. soldering iron B. induction furnace C electric resistance method
. D. any one of these
Q.10)
oxygen to "cetylene r"tio in c"se of neutr"l fl"¡e is ----
A.
0.8:1
B. 1:1 C.
1.2:1
D. 2:1 Q.11)
In MIG welding , He or Ar is used in order to ----
A.
provide cooling effect
B.
act as flux
C. act as shielding medium D. facitilate welding process E.
protect electrodes
Q.12)
Neutr"l fl"¡e h"s ---
A. 1 zone B. 2 zone C. 3 zone D. 4 zone E. no zone
Q.13) c"rburizing fl"¡e h"s ----
A. 1 zone B. 2 zone C. 3 zone D. 4 zone E. no zone
Q.14)
Which of the following ¡"teri"ls is best weld"ble with itself ??
A. stainless steel B.
copper
C. aluminium D.
mild steel
E. cast iron Q.15)
Which of the following g"s is used TIG welding ¢rocess ?
A. acetylene B.
oxygen
C.
Hydrogen
D. argon E.
Helium
Q.16)
Which of the following flux is used for br"zing c"st iron ?
A.
mixture of boric acid ,borex and wetting agent
B.
boric acid ,borex or fluoride with a wetting agent
C. chloride and flourides mixed with water D. all of the above
Q.17) Undercuts in the weld¡ents "re c"used due to ---
A. low welding current B.
excessive welding current
C. wrong selection of welding rods D. wrong flux E. greasy and dirt surfaces
Q.18)
The g"s torch is usu"lly lighted by friction lighter bec"use ---
A. it is easier to operate and maintain B. of low initial cost C.
spark is created for very sort duration
D.
of safety of operator
E.
of least running cost
Q.19) Which of the following ¡et"ls c"n be suitbly welded by TIG welding ?
A. aluminium B. stainless steel C. magnesium D. pure titanium E.
all of the above
Q.20)
For two ¡et"ls to be br"zed ¢ro¢erly , i.e.for wetting "ction to t"kes ¢l"ce , the dist"nce between the two surf"ce should be --
A. < o.025 mm B. o.025 - o.075 mm C. > 0.1 mm D.
about 0.5 mm
Q.21) Neutr"l fl"¡e is used to weld ¡et"l like ?
A.
steel
B.
copper and brass
C. aluminium , stainless steel ,zinc die casting ,nickel , monel etc D.
neutral material
Q.22)
c"rburizing fl"¡e is used to weld ¡et"ls like -----
A.
aluminium,stainless steel,zinc die casting,nickel,monel etc
B.
steel
C. carburizing steel D.
copper and brass
Q.23) "nticoh ¢rocess is " ---
A. process of making porous mould B. continuous casting process C.
brazing process
D. welding process Q.24)
Bl"nking "nd ¢iercing o¢er"tion c"n be ¢refered si¡ult"neously in ---
A.
simple die
B. progressive die C. compound die D.
combination die
Q.25)
the "rc length in electric "rc welding is the dist"nce between the ti¢ of the electrode "nd the -----
A. work piece B. centre of crater C.
bottom of crater
D.
work piece top structure minus electrode diameter
E.
none of these
Q.26)
In "rc welding ,te¡¢er"ture of which of the following order ¡"y be gener"ted ?
A. 1000 degree C B. 15000 degree C C. 5500 degree C D. 8000 degree C
Q.27) Long "rc lengths in welding would required the volt"ges "nd current res¢ectively "s ---
A.
high , low
B. low , low C.
high , high
D. low high Q.28)
which of the following c"rbon steel is ¡ost weld"ble ?
A. 0.15% C steel B. 0.30% C steel C. 0.50% C steel D. 0.75% C steel
Q.29)
Met"l de¢osited on to the work¢iece fro¡ the electrode ---
A.
is forced across the arc
B.
falls due to gravity
C. is attracted toward the workpiece due to positive polirity of tthe work piece D. is attracted toward the workpiece due to negative polirity of tthe work piece E.
is attracted due to electromagnetic action
Q.30) In "rc welding o¢er"tion , the current v"lue is decided by ---
A.
thickness of the plate
B.
length of the weld portion
C.
voltage across the arc
D.
speed of travel
E. size of elecctrode Q.31) The te¡¢er"ture r"nge for soldering ¢rocess is ---
A.
300 - 500 degree C
B.
40 - 100 degree C
C.
600 - 900 degree C
D.
80 - 250 degree C
Q.32)
No of zones of he"t gener"ted in s¢ot welding "re ----
A.
2
B.
3
C.
5
D.
8
Q.33)
In s¢ot welding ,ti¢ of electrodes is of ----
A. stainless steel B. aluminium C.
copper
D. brass Q.34) in s¢ot welding s¢"cing between 2 s¢ot welds should not be less th"n ---
A.
electrode tip diameter(d)
B. 1.5d C.
3d
D. 4.5d Q.35) Multis¢ot welding ¢rocess is ----
A.
seam welding
B.
projection welding
C. thermit welding D. percussion welding
Q.36) B"sicity index flux is c"lcul"ted by ------
A.
sum of basic constituent/sum of acidic constituent
B sum of basic constituent/sum of (acidic+basic) constituent
. C.
sum of acidic constituent/sum of basic constituent
D.
sum of acidic constituent/sum of (acidic+basic) constituent
Q.37)
c"rbon equiv"lent in steel for good weld"bility is ---
A. 1.0 B. 0.8 C. 0.6 D. 0.4
Q.38) ----- for¡s inter¡et"llic co¡¢ound with co¢¢er "nd iron .
A.
Tin
B. lead C.
cadmium
D. Bismuth Q.39) the ¡"in function of le"d "s "n "ddition to tin le"d solder "re to ¢roduce "n "lloy with -------
A. lower melting point B. good wetting C. intermetallic compound D.
greater strength
Q.40)
The objective of ------ o¢er"tion is to ensure th"t the surf"ces to be joined "re co¡¢letely wetted by " very thin fil¡ of solder.
A.
Tinned
B. Coating C. Cleaning D.
Dipping
Q.41) Pl"z"¡" is ----
A.
atom
B.
molecules
C. mixture of gases D. mixture of electron and positive ions
Q.42)
In tr"nsferred "rc ¢l"s¡" ¡ethod "rc is struck b/w------
A. a tungsten electrode and workpiece B. two tungsten electrode C. electrode and nozzle D. under the planket of the flux
Q.43)
In which of the following welding ¡ethod work¢iece is the ¢"rts of the circuit ?
A.
Plasma arc welding process
B.
Electroslag welding
C. submerged arc welding process D.
Percussion welding
Question Excerpt From METAL FORMING SET 1Q.1)
Wire is made by ----
A.
extrusion
B.
forging
C. rolling D. drawing
Q.2)
blade for turbine engine is made by -----
A. sand casting B.
extrusion
C.
investment casting
D.
forging
Q.3)
Greater forging capacity is achieved with ---
A. power hammer B. hydraulic press C. mechanical press D.
none of these
Q.4) The resistant to compressive deformation increases when length to thickness ---
A.
decreases
B. increases C. remains constant D.
uncertain
Q.5) bite ratio for forging to minimize the inhomogeneous deformation is ----
A. 1/3 B. 1/4 C. not less than 1/3 D. not more than 1/4
Q.6) squeeze ratio for forging is ----
A. 1.3 B. 1.4 C. not less than 1.3 D. not more than 1.3
Q.7) fire hydrants are made by ---
A. sand casting B.
fording
C.
investment casting
D. rolling Q.8)
turbine roter is made by ---
A. rolling B. sand casting
C.
forging
D.
extrusion
Q.9) Product of first breakdown of ingot in rolling is ---
A. billet B.
bloom
C.
slab
D. plate Q.10) width of slab is ---
A.
2 X thickness
B.
3 X thickness
C. 2.5 X thickness D. 2.75 X thickness
Q.11) the objective of the hot or cold rolling is to decrease the ----
A.
width
B. thickness C.
width and thickness
D.
none of these
Q.12) slab directly produced from the molten metal by ---
A. rolling B.
forging
C.
investment casting
D.
continuous casting
Q.13)
plate , the product of rolling ,having thickness --
A. more than 6 mm B. less than 6 mm C. 6 mm D. 7 mm
Q.14)
sheet , the product of rolling , having thickness --
A. more than 6 mm B. less than 6 mm C. 6 mm D.
none of these
Q.15) Jet engine impellers are made by ---
A. sand casting B.
extrusion
C.
investment casting
D forging
. Q.16) automotive crankshafts are made by ---
A. rolling B.
forging
C.
investment casting
D. drawing Q.17) automotive crankshafts are made by ---
A. rolling B.
forging
C.
investment casting
D. drawing Q.18) in dry wire drawing the lubricant used is ---
A. soap B. glycerin C. pine oil D. oil with Ep addition
Q.19) in wet wire drawing the lubricant used is ---
A. soap B. glycerin C. pine oil D. oil with Ep addition
Q.20) Decreasing the die angle in extrusion ----
A. increases the homogenity of deformation B.
lower the extrusion pressure
C. increases the extrusion pressure D.
both increases the homogenity of deformation and lower the extrusion pressure
Q.21) For drawing operation , the best suited press is ----
A. knuckle joint press B. crank shaft and connecting rod press C. toggler press D. reck and pinion press E.
none of these
Q.22) An important product manufactured by rolling is ----
A. I-section B. tubes C. metal rolls D.
roller
E.
discs
Q.23) thread rolling is somewhat like ---
A.
cold extrusion
B. cold machining C cold rolling
. D. cold forging E. plug rolling
Q.24)
symmetrical hollow parts of circular cross section are made by hot ----
A.
forging
B.
extrusion
C. piercing D. drawing E. spinning
Q.25)
Forging of plain carbon steel is carried out at ----
A.
750 degree C
B.
900 degree C
C. 1100 degree C D. 1300 degree C
Q.26) The important mechanical property of a material for extrusion purposem is ---
A.
continuity
B. ductility C. elasticity D. plasticity E. brightness
Q.27)
The production of contours in flat blanks is termed as ----
A. blanking B. piercing C.
perforating
D.
punching
Q.28) Plug rolling is used to ----
A. produce collapsible tubes B.
produce seamless tube
C.
reduce diameter of tubes
D. increase wall thickness of tubes E. reduce wall thickness and increase diameter of tube
Q.29)
Metallic cans are usually produced by ----
A. embossing B. coining C. spinning D. drawing E. extruding
Q.30) In press operation , the size of the pierced hole is dependent on the size of ---
A.
punch
B die
. C. average of punch and die D.
punch and clearance
E.
die and clearance
Q.31) capability of a material to undergo deformation without cracking is called ---
A. forgebility B. flowability C. maleability D. ductility
Q.32) Extrusion force is equal to ----
A. kA<sub style="line-height: 1em; ">o </sub><sub style="font-size: 12px; line-height: 1em; ">ln(</sub>A<sub style="font-size: 12px; line-height: 1em; ">o /</sub>A<sub style="font-size: 12px; line-height: 1em; ">f )</sub>
B.
<div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); ">kA<sub style="line-height: 1em; ">o  ln (</sub>A<sub style="line-height: 1em; ">f /</sub>A<sub style="line-height: 1em; ">o )</sub></div>
C.
<div style="font-family: Arial, Verdana, sans-serif; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); "><sub style="font-size: 12px; ">K</sub><sub style="font-size: 12px; line-height: 1em; ">Â ln(</sub>A<sub style="font-size: 12px; line-height: 1em; ">o /</sub>A<sub style="font-size: 12px; line-height: 1em; ">f )</sub></div>
D. <sub style="font-size: 12px; line-height: 1em; ">ln(</sub>A<sub style="font-size: 12px; line-height: 1em; ">o /</sub>A<sub style="font-size: 12px; line-height: 1em; ">f )</sub>
Q.33)
In -------- extrusion process , Instead of applying the load on the billet directly by the ram a fluid medium can be used .
A. Hydrostatic B. Impact C.
Backward
D. Forward Q.34)
------ is the operation through which raised figure are made on metal sheet , with its corresponding relief on other side.
A. Embossing B. Strech forming C. peen forming D. Deep drawing E.
Hemming
F. Dimpling Q.35) In Rolling , maximum reduction (Δh)max = ------ per roll
A.
μ<sup style="line-height: 1em; ">2</sup>R
B.
<div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); ">μ<sup style="line-height: 1em; ">2/3</sup>R</div>
C. <div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); ">μ<sup style="line-height: 1em; ">1/2</sup>R</div>
D.
<div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); ">μR<sup style="line-height: 1em; ">2</sup></div>
Q.36) Ram speeds of --------- for refractory metals requires a hydraulic accumulator with the press
A. 0.4-0.6 m/s B. 4-6 m/s C. 1-2 m/s D.
0.4-0.6 mm/s
Q.37) The follower pad is placed between the hot billet and the ram for --------
A.
protection purpose
B. support purpose C.
reducing friction
D.
applying more pressure
Q.38)
For indirect extrusion, extrusion pressure is -------- with increasing ram travel and represent the stress required to deform the metal through the die.
A.
constant
B. increases C.
decreases
D. varises continuously Q.39) Velocity of extruded product= ------
A.
ram velocity x extrusion ratio
B.
(ram velocity)/(extrusion ratio)
C.
(extrusion ratio)/(ram velocity)
D.
none of these
Q.40) In extrusion ,heat generated by friction at the die/material interface is -----
A.
highest
B. lowest C.
moderate
D.
not fixed
Q.41) For a given extrusion pressure, extrusion ratio R -------- with increasing Extrusion temperature .
A. increases B.
decreases
C.
constant
D.
not fixed
Q.42) Actual extrusion pressure (Pe)=----
A.
<div>Pe=(�lnR)/η</div>
B.
<div><div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); "><div>Pe=(lnR)/η</div></div></div><br />
C.
<div><div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); "><div>Pe=(�lnR)</div></div></div><br />
D.
<div><div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); "><div>Pe=η(�lnR)</div></div></div><br />
Q.43) In extrusion , time average mean strain rate (εt)=---
A. <div>(6vlnR)/Db</div>
B. (lnR)/Db C.
(vlnR)/Db
D.
(6vlnR)
Question Excerpt From METAL FORMING SET 2Q.1) Gear are formed by ---
A.
extrusion
B. sand casting C.
fine blanking
D.
forging
Q.2) rail road wheel is made by -----
A.
forging
B.
extrusion
C. blanking D. drawing
Q.3) rail road rails are made by ---
A.
extrusion
B.
forging
C. rolling D. drawing
Q.4)
For high strength sheet alloys , the minimum bend radius may be ---
A.
3T
B.
4T
C.
5T
D.
6T
Q.5) Spring back phenomena occurs in ---
A.
forging
B.
hot peening
C. spinning D. bending
Q.6) For the plastic material poisson ratio is ----
A. 0.33 B. 0.5 C. 0.42 D. 0.28
Q.7) streach forming is a process of ---
A.
extrusion
B.
cold rolling
C.
forging
D. spining E.
cold drawing
Q.8)
swaging is an operation of ---
A.
extrusion
B.
hot rolling
C. piercing D.
forging
E.
drawing
Q.9) The process of removing the flash or burr from the forged part in drop forging is ----
A. coining B. lancing C. shot opening D. trimming E.
burring
Q.10) The machinery used in the production of channels of I-section ,rail -section ,angle etc is called ----
A. forging plant B. continuous casting machines C. hot spinning machines D. rolling mills E. extrusion mills
Q.11) the blow produced by power hammer is ----
A. mgh+PAh B. mgh C. 1/2.mv<i><b><sup>2</sup>Â </b></i> D. PAh
Q.12) Air lift hammer uses ---
A. compressed air to lift the ram B. hydraulic press C. mechanical press D. electrical power
Q.13)
A numerical modeling technique that involves splitting the whole ofa body into a series of simple geometrical elements that are joinedtogether at points (nodes) where both equilibrium (lower bound) andcompatibility (upper bound) requirement are established is called .....
A.
Finite element analysis
B. shaping technique C. casting technique D.
forging technique
Q.14)
In ------ process the edge of the sheet is folded over itself .
A. Hemming B.
Dimpling
C. Bending D. Piercing E.
Deep drawing
Q.15) The ---------- of the billet, the greater the effect of low extrusion speed on the cooling of the billet
A.
higher the temperature
B. lower the temperature C. moderate the temperature D.
any of these
Q.16)
In ------ process ,the billet is heated in an inert atmosphere and coated with glass powder before being pressed. The glass pad placed between the die and the billet provide the main source of lubricant .
A. Ugine-Sejournet process
B.
Hydrostatic extrusion
C.
Hot extrusion
D.
Cold extrusion
Q.17)
Centre burst also known as chevron cracking, can occur at ----------- due to low frictional conditions on the zone of deformation at the extrusion die
A.
low extrusion ratio
B.
high extrusion ratio
C. high temperature and constant pressure D. constant temperature and high pressure
Q.18)
Surface cracking, ranging from a badly roughened surface to repetitive transverse cracking called --------, This is due to longitudinal tensile stresses generated as the extrusion passes through the die.
A.
fir-tree cracking
B.
chevron cracking
C.
Hot shortness
D. Inhomogeneous deformation Q.19) DePierre showed that the total extrusion force (Pe) is the summation of the forces -----
A.
Pe=Pd+Pfb+Pff
B.
<div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); ">Pe=Pd+Pfb</div>
C.
<div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); ">Pe=Pfb+Pff</div>
D.
<div style="font-family: Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); ">Pe=Pd+Pff</div>
Q.20) In hydrostatic extrusion , extrusion ratio (R) for aluminium =----
A.
200:1
B. 20:1 C.
400:1
D. 50:1 Q.21)
In--------- the axial force is applied either to the billet or to the extrusion.
A. augmented hydrostatic extrusion B. hydrostatic extrusion C. Ugine-Sejournet process D. vertical extrusion
Q.22)
The ---------- is used for the rotary piercing of steel and copper billets using two barrel-shape driven rolls, which are set at an angle to each other. The axial thrust is developed as well as rotation to the
billet
A. Mannesmann mill B. plug rolling mills C.
three-roll piercing machine
D. reeling mill Q.23)
Porthole extrusion is used to produce -------
A. hollow unsymmetrical shapes in aluminum alloys B. hollow symmetrical shapes in aluminum alloys C. solid unsymmetrical shapes in aluminum alloys D. solid symmetrical shapes in aluminum alloys
Q.24)
In Rolling ,--------- will occur when lateral spread is greater in the centre than the surface (surface in tension, centre incompression) and with the presence of metallurgical weakness along the centreline.
A. Alligatoring B. Edging C. Laps D.
Flakes
Q.25) In Rolling , If the there is an increase in strip tension, the plastic curve will move to the ------.
A.
left
B.
Right
C. Up D. Down
Q.26)
In Rolling, If the sheet thickness increases, the plastic curve will move to the ----- relative to the elastic curve.
A. right B.
Left
C. Up D. Down