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This set of Design of Machine Elements Multiple Choice Questions & Answers (MCQs) focuses on Design Of Machine Elements Set 9
Q1 | Maximum shear stress in transverse fillet weld of leg h and length l is
- p/hl
- 1.21p/hl
- p/1.21hl
- none of the listed
Q2 | Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.
- true
- false
Q3 | Saddle key is more suitable than sunk key for heavy duty applications.
- true
- false
Q4 | The main advantage of sunk key is that it is a drive.
- positive
- negative
- neutral
- none of the listed
Q5 | Woodruff key permits movement b/w shaft and the hub.
- axial
- radial
- eccentric
- none of the listed
Q6 | Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.
- 49mm
- 36mm
- 46mm
- 53mm
Q7 | Splines are keys.
- true
- false
Q8 | Refer to fig 1.Two plates are fastened by means of two bolts. The yield strength of bolt is 400N/mm² and factor of safety is 4. Determine the permissible shear stress in the bolts.
- 100n/mm²
- 50n/mm²
- 25n/mm²
- 75n/mm²
Q9 | Refer to fig 1. Two plates are fastened by means of two bolts. The yield strength of bolt is 400N/mm² and factor of safety is 4. Determine the size of the bolts.
- 8mm
- 9mm
- 10mm
- 11mm
Q10 | 8’CW from the vertical. Hence net shear force = √ [5000cos36.8+1250]²+ [5000sin36.8]².
- 10.74mm
- 9.23mm c) 11.54mm
- d) 8.68mm
Q11 | Which bolt is under maximum shear stress?
- 1
- 2
- 3
- all are under equivalent shear stress
Q12 | Arrange the bolts in order of decreasing shear stresses.
- 1>2>3
- 2>1>3
- 3>1>2
- 3>2>1
Q13 | Determine the secondary shear stress acting on the bolt 3 and its direction. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm.Also P=5kN acts at a distance of 200mm from the channel.
- 6100n vertically up
- 4500n vertically down
- 4500n vertically down
Q14 | Determine the size of the bolts if yield strength of bolt is 400N/mm² and factor of safety is 4. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm. Also P=5kN acts at a distance of 200mm from the channel.
- 14.34mm
- 13.44mm c) 15.44mm d) 12.66mm
Q15 | Knuckle Joint can’t be used to connect two intersecting rods.
- yes
- no, it can’t be used
- it can be used with some modificatios
- it is expensive and hence isn’t used
Q16 | A knuckle joint is unsuitable for two rotating shafts, which transmit torque
- true
- false
Q17 | A maximum of how many roads may be connected using a knuckle joint?
- 2
- 3
- 4
- 5
Q18 | A knuckle joint is also called socket pin joint.
- true
- false
Q19 | Which of the following are important parts of knuckle joint?
- eye
- pin
- fork
- each of the mentioned
Q20 | 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
Q21 | 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
Q22 | 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
Q23 | 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
Q24 | The principle of wedge action is used in cotter joint.
- true
- false
Q25 | Can the cotter joint be used to connect slide spindle and fork of valve mechanism?
- true
- false