Welded and Riveted Joints:
Q. All welding processes require pressure along with heat.
A. Yes
B. No, fusion doesn’t require
C. Can’t be stated
D. None of the listed
.
Answer: B
Explanation: Welding processes involving only heat and no pressure are called the fusion welding processes.
Q. The capacity of welded structures to damp vibrations is quite good.
A. True
B. False
.
Answer: B
Explanation: Capacity of welded joints to damp vibrations is poor.
Q. Themit consists of a finely divided mixture of iron oxide and copper.
A. True
B. False
.
Answer: B
Explanation: Thermite is a mixture of iron oxide and copper.
Q. Rails in the field are generally welded by using
A. Thermit welding
B. Gas welding
C. Electric arc welding
D. Forge welding
.
Answer: A
Explanation: Wherever it is uneconomical to carry welding equipments, thermit welding is used.
Q. In gas welding which of the following is generally used?
A. Oxygen-Hydrogen
B. Oxygen-Acetylene
C. Oxygen-Hydrogen or Oxygen-Acetylene
D. None of the mentioned
.
Answer: C
Explanation: Intense heat is released I a controlled way and at a moderate temperature.
Q. Among gas and electric arc welding, which has the higher rate of heating?
A. Gas welding
B. Electric arc welding
C. Gas welding and electric arc welding have equal rate of heating
D. Cannot be determined
.
Answer: B
Explanation: Gas welding has a gas temperature of about 3200’C while arc temperature is about 40000’C.
Q. Forge welding involves heating of parts to elastic stage and joint is prepared by impact force.
A. Yes
B. No, it is done up to plastic stage
C. Heating is done up to boiling point
D. None of the listed
.
Answer: B
Explanation: Heating is done up to plastic stage.
Q. Filler material is used in electric resistance welding.
A. Yes
B. No filler material used
C. Depends on the type of welding
D. None of the listed
.
Answer: B
Explanation: No filler material is used. Only the heat released from resistance of metallic parts to current is used for melting the adjoining parts.
Q. Which type of welding is generally used in automobile sector?
A. Electric arc welding
B. Electric resistance welding
C. Gas welding
D. Forge welding
.
Answer: B
Explanation: Electric resistance welding can be easily automated and hence is used in automobile sector.
Q. Hard peening is
A. Hammering the weld across the length while the joint is hot
B. Hammering the weld along the length while the joint is hot
C. Hammering the weld along the length while the joint is cold
D. Hammering the weld across the length while the joint is cold
.
Answer: B
Explanation: Hammering is doe to relieve stresses and inducing compressive stresses to improve the fatigue strength of the joint.
Q. Strength of parallel fillet weld is greater than strength of transverse fillet weld.
A. True
B. False
.
Answer: B
Explanation: Strength of transverse fillet weld is 1.17 times the strength of parallel fillet weld.
Q. If force act in a direction parallel to the direction of weld, then fillet weld is called as?
A. Transverse
B. Longitudinal
C. Parallel
D. Longitudinal or Parallel
.
Answer: D
Explanation: Parallel fillet weld consist of force acting in a direction of weld.
Q. Convex weld is generally preferred over normal weld.
A. True
B. False
.
Answer: B
Explanation: There is more stress concentration in convex weld and hence is less preferred.
Q. Parallel fillet weld and transverse fillet weld both have the plane in which maximum shear stress occurs at 45’ to the leg dimension.
A. True
B. False
.
Answer: B
Explanation: Transverse fillet weld has that plane inclined at 67.5 .
Q. The length of each of the two equal sides of a parallel fillet weld is called
A. Leg
B. Throat
C. Arm
D. None of the listed
.
Answer: A
Explanation: Leg is the length of each of the two equal sides of a parallel fillet weld.
Q. Relation between throat and leg for a parallel fillet weld is
A. t =h Cos (45’)
B. h =t Cos (45’)
C. h= t
D. None of the listed
.
Answer: A
Explanation: Throat is the minimum cross section of the weld and that plane lies at 45’ for a parallel fillet weld.
Q. If length of weld is l and leg h, then area of throat can be given by
A. 0.707 hl
B. 1.414hl
C. hl
D. None of the listed
.
Answer: A
Explanation: Area=t x l where t=h Cos (45’).
Q. Which of the following isn’t a main part of rivet?
A. Head
B. Shank
C. Point
D. Thread
.
Answer: D
Explanation: There aren’t any threads in rivets.
Q. A rivet is specified as a 20mm rivet. What does it mean?
A. None of the mentioned
B. Shank dia 20mm
C. Head dia 20mm
D. Both head and shank dia 20mm
.
Answer: B
Explanation: Terminology is this way.
Q. In hand riveting die is a part of hammer.
A. True
B. False
.
Answer: B
Explanation: Die is a part of hammer in machine riveting.
Q. In hot riveting the shank portion is subjected to compressive stress.
A. True
B. False
.
Answer: B
Explanation: It is subjected to tensile stress as the head rests against the connected members to prevent reduction in length.
Q. The amount by which the two rods to be joined are drawn together is called as?
A. Draw
B. Portray
C. Lead
D. Pitch
.
Answer: A
Explanation: Draw measures the amount of distance advancing after which spigot rests on socket.
Q. Two steel rods connected by cotter joint are subjected to 50 kN load each. What is the minimum diameter required of the rods? (Given: Yielding Stress= 400N/mm² ; Factor of Safety=6)
A. 31mm
B. 35mm
C. 36mm
D. 40mm
.
Answer: A
Explanation: d=√(4P/πσ) where σ= Yielding Stress/F.S ; d=30.90mm or 31 mm.
Q. Among punching and drilling, which is cheaper?
A. Punching
B. Drilling
C. Equally expensive
D. Cannot be determined
.
Answer: A
Explanation: Drilling has more accuracy and is more expensive.
Q. Among punching and drilling, punching is safer.
A. True
B. False
.
Answer: B
Explanation: Punching injures the metal in the vicinity of the hole.
Q. Riveting is not recommended for aluminium alloys.
A. True
B. False
.
Answer: B
Explanation: Aluminium alloys have poor weldability and hence riveting is preferred.
Q. In joining steel plate and asbestos, welding is preferred over riveting.
A. True
B. False
.
Answer: B
Explanation: Riveting is preferred in joining heterogeneous materials.
Q. Quality checking of riveted joint is much expensive than that of welded joint.
A. True
B. False
.
Answer: B
Explanation: In welding, inspections like radiographic inspections are quite costly.
Q. Which of the following rivet head consist of frustum of cone attached to the shank?
A. Pan head rivet
B. Countersunk head rivet
C. Flat head rivet
D. Cone head rivet
.
Answer: D
Explanation: Cone head rivet consist of frustum of cone attached to shank.
Q. Among flat head and snap head rivet, which has the higher head height?
A. Snap
B. Flat
C. Equal
D. There is no such relation
.
Answer: A
Explanation: Flat head has lesser height of protruding head and thus it does not weaken the plates being assembled.
Q. Which of the following are used in light sheet metal work?
A. Tinmen’s rivets
B. Snap head rivets
C. Button head rivets
D. Each of the mentioned
.
Answer: A
Explanation: Tinmen’s rivets are flat head rivets of small sizes.
Q. Two plates each of thickness t are to be riveted together. If length of shank portion necessary to form the closing head is a, then length of rivet shank is given by?
A. 2t+a
B. 2(t+A.
C. t+2a
D. Can’t be determined
.
Answer: A
Explanation: l=t₁+t₂+a.
Q.A strap is used in a lap joint which is riveted to each of the two plates.
A. True
B. False
.
Answer: B
Explanation: That joint is called butt joint.
Q. What is the other name for pitch?
A. Transverse pitch
B. Back pitch
C. Row pitch
D. None of the listed
.
Answer: D
Explanation: Transverse, back and row pitch are all same. It is the distance b/w two consecutive rows of pitch.
Q. Are the rivets subjected any bending moment in case of lap joint?
A. Yes
B. No
.
Answer: A
Explanation: The rivets are subjected to bending moment which causes distortion.
Q. Lozenge joint is a kind of lap joint.
A. True
B. False
.
Answer: B
Explanation: Lozenge joint is another name for diamond joint and it is a kind of butt joint.
Q. Can we use rivets of the same materials as the parts to be joined?
A. True
B. False
.
Answer: A
Explanation: Heterogeneous material may lead to formation of galvanic pairs which can cause corrosion.
Q. Failure in rivet occurs by which mode?
A. Shear
B. Compression
C. Tensile
D. Each of the mentioned
.
Answer: D
Explanation: Rivet may fail by shearing, plates between two rivets can undergo tensile failure and plates might fail by crushing.
Q. Fullering is done with a pointed tool.
A. True
B. False
.
Answer: B
Explanation: Fullering is done to close the joint with a tool of thickness same as that of the plate.
Q. Calculate the diameter of the rivets by shear considerations if permissible shear stress in rivets is 60N/mm² and P=15kN.
A. 6mm
B. 7mm
C. 9mm
D. 8mm
.
Answer: C
Explanation: P=4x[τ x πd²/4].
Q. Calculate the diameter of the rivets by crushing consideration if permissible compression stress in rivets is 120N/mm², thickness of plate 3mm and P=15kN.
A. 10.4mm
B. 11.5mm
C. 9.2mm
D. 8.6mm
.
Answer: A
Explanation: P=4x[d t σ].
Q. Calculate width of the band if permissible tensile stress is 80N/mm². Force P=15kN and diameter of the rivet can be taken as 9mm. Given thickness=3mm
A. 80.5mm
B. 79.5mm
C. 76.66mm
D. 54.6mm
.
Answer: A
Explanation: [w-2d]tσ=P.
Q. If diameter of rivets is 9mm, then margin can be taken as?
A. 13.5mm
B. 12.5mm
C. 11.5mm
D. 9mm
.
Answer: A
Explanation: m=1.5d.
