Design Of Machine Elements Set 3

Mechanical Engineering

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This set of Design of Machine Elements Multiple Choice Questions & Answers (MCQs) focuses on Design Of Machine Elements Set 3

Q1 | A knuckle joint is unsuitable for two rotating shafts, which transmit torque
  • true
  • false
Answer: true
Explaination:
knuckle joint can’t be used for torque transmission.
Q2 | A maximum of how many roads may be connected using a knuckle joint?
  • 2
  • 3
  • 4
  • 5
Answer: 3
Explaination:
in rare explanation, two rods with forks and one rod with eye is connected.
Q3 | Which of the following are important parts of knuckle joint?
  • eye
  • pin
  • fork
  • each of the mentioned
Answer: each of the mentioned
Explaination:
all the mentioned parts are important components of knuckle joint.
Q4 | Calculate the diameter of pin from shear consideration with maximum shear stress allowed is 40NN/mm² and an axial tensile force of 50kN is acting on the rod.
  • 39mm
  • 44mm
  • 49mm
  • 52mm
Answer: 39mm
Explaination:
as the pin is subjected to double shear diameter (d) = √(2p/π x τ) = 38.80mm.
Q5 | If knuckle joint is to fail by crushing failure of pin in fork, then determine the diameter of knuckle pin when 50kN axial tensile force act on rods. Given: Max allowable compressive stress=25N/mm², thickness of each eye of fork=25mm.
  • 40mm
  • 50mm
  • 60mm
  • 70mm
Answer: 40mm
Explaination:
d=p/2aσ = 40mm.
Q6 | A knuckle joint can be used in valve mechanism of a reciprocating engine.
  • yes
  • no
  • yes but there are stress probles
  • no as it is very dangerous to use
Answer: yes
Explaination:
knuckle joint can be used till the rods coincide or intersect in a plane.
Q7 | Cotter joint is used when the members are subjected to which type of stresses?
  • axial tensile
  • axial compressive
  • axial tensile or compressive
  • none of the mentioned
Answer: axial tensile or compressive
Explaination:
cotter joint is used when axial forces are applied.
Q8 | The principle of wedge action is used in cotter joint.
  • true
  • false
Answer: true
Explaination:
wedge action imparts tightening to the cotter joint.
Q9 | Which of the following is not a part of cotter joint?
  • socket
  • spigot
  • cotter
  • collar
Answer: collar
Explaination:
there is no point of mentioning collar alone in a cotter joint. it has to be a spigot collar or socket collar.
Q10 | Cold riveting holds the connected parts better than hot riveting.
  • true
  • false
Answer: false
Explaination:
the compression of connected parts in hot riveting causes friction, which resist sliding of one part with respect to other. this force is greater in hot riveting.
Q11 | 67 N/mm².; Spigot dia=65mm; thickness 0f collar=15mm
  • 131mm
  • 139mm
  • 141mm
  • 149mm
Answer: 131mm
Explaination:
compressive stress= p/ [(socket dia-spigot dia)*thickness].
Q12 | Cotter joint can be used to connect two rods for torque transmission purpose.
  • true
  • false
Answer: false
Explaination:
cotter joint is never used to connect two rods for torque transmission purpose.
Q13 | Thickness of plate is required more in welding than in riveting.
  • true
  • false
Answer: false
Explaination:
in riveting, cross section is weakened due to the holes and to compensate this, thicker plates are required in riveting.
Q14 | The capacity of welded structures to damp vibrations is quite good.
  • true
  • false
Answer: false
Explaination:
capacity of welded joints to damp vibrations is poor.
Q15 | Themit consists of a finely divided mixture of iron oxide and copper.
  • true
  • false
Answer: false
Explaination:
thermite is a mixture of iron oxide and copper.
Q16 | Rails in the field are generally welded by using
  • thermit welding
  • gas welding
  • electric arc welding
  • forge welding
Answer: thermit welding
Explaination:
wherever it is uneconomical to carry welding equipments, thermit welding is used.
Q17 | In gas welding which of the following is generally used?
  • oxygen-hydrogen
  • oxygen-acetylene
  • oxygen-hydrogen or oxygen-acetylene
  • none of the mentioned
Answer: oxygen-hydrogen or oxygen-acetylene
Explaination:
intense heat is released i a controlled way and at a moderate temperature.
Q18 | Filler material is used in electric resistance welding.
  • yes
  • no filler material used
  • depends on the type of welding
  • none of the listed
Answer: no filler material used
Explaination:
no filler material is used. only the heat released from resistance of metallic parts to current is used for melting the adjoining parts.
Q19 | Which type of welding is generally used in automobile sector?
  • electric arc welding
  • electric resistance welding
  • gas welding
  • forge welding
Answer: electric resistance welding
Explaination:
electric resistance welding can
Q20 | Hard peening is
  • hammering the weld across the length while the joint is hot
  • hammering the weld along the length while the joint is hot
  • hammering the weld along the length while the joint is cold
  • hammering the weld across the length while the joint is cold
Answer: hammering the weld along the length while the joint is hot
Explaination:
hammering is doe to relieve stresses and inducing compressive stresses to improve the fatigue strength of the joint.
Q21 | A rivet is specified as a 20mm rivet. What does it mean?
  • none of the mentioned
  • shank dia 20mm
  • head dia 20mm
  • both head and shank dia 20mm
Answer: shank dia 20mm
Explaination:
terminology is this way.
Q22 | In hand riveting die is a part of hammer.
  • true
  • false
  • topic 3.5 riveted joints for structures
Answer: false
Explaination:
die is a part of hammer in machine riveting.
Q23 | The amount by which the two rods to be joined are drawn together is called as?
  • draw
  • portray
  • lead
  • pitch
Answer: draw
Explaination:
draw measures the amount of distance advancing after which spigot rests on socket.
Q24 | 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)
  • 31mm
  • 35mm
  • 36mm
  • 40mm
Answer: 31mm
Explaination:
d=√(4p/πσ) where σ= yielding stress/f.s ; d=30.90mm or 31 mm.
Q25 | Among punching and drilling, which is cheaper?
  • punching
  • drilling
  • equally expensive
  • cannot be determined
Answer: punching
Explaination:
drilling has more accuracy and is more expensive.
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