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This set of Design of Machine Elements Multiple Choice Questions & Answers (MCQs) focuses on Design Of Machine Elements Set 8
Q1 | 1816/ [7200 x 10.8184 x 50] or σ=100.6N/mm².
- 14.80mm
- 13.95mm
- 16.5mm
- 17.2mm
Q2 | A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering only direct tensile stress.
- 4.7mm
- 6.8mm
- 13.95mm
- 3.4mm
Q3 | All type of stresses vanishes after as soon as the applied load is removed.
- true
- false
Q4 | Residual stresses are always added in the load stresses and hence are always harmful.
- true
- false
Q5 | Which of the following is the numerator of factor safety formula?
- working stress
- shear stress
- tensile stress
- ultimate stress
Q6 | Which of the following can be the factor of safety for a dead load?
- 6
- 2
- 4
- 7
Q7 | Which of the following can be the factor of safety for shock loading?
- 11
- 13
- 4
- 7
Q8 | Factor of safety is used to find out the reliability of the design.
- true
- false
Q9 | What can understand by the factor of safety equal to one?
- it means that the structure will fail under load
- it means that the structure will only support the actual load
- it means that the structure will support more than the actual load
- there is no relation between factor safety and load application
Q10 | For which of the following design factor of safety the design will work properly?
- 0.1
- 1
- 2 d) 0.9
Q11 | What is a safe factor of failure for a component which on failure can result in financial loss or serious injury?
- 1
- 2
- 3
- 4
Q12 | Design factor for most aircraft structures is 2.
- true
- false
Q13 | While designing shaft on the basis of torsional rigidity, angle of twist is given by?
- ml/gd⁴
- 584ml/gd⁴
- 292 ml/gd⁴
- none of the mentioned
Q14 | Does ASME Standard take into consideration shock and fatigue factors?
- yes
- no
Q15 | If allowable shear stress in the shaft is 70N/mm² and torsional and bending moments are M=1185000N-mm and m=330000N-mm, find the diameter of the shaft.
- 36.8mm
- 39.7mm
- 44.7mm
- 40.3mm
Q16 | If bending moment on point B in horizontal plate is M and in vertical plane is m, then the net bending moment at point B is?
- m
- m
- m+m
- √m²+m²
Q17 | Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5’ and take G=79300N/mm².
- none of the listed
- 41.2mm
- 35.8mm
- 38.8mm
Q18 | If yielding strength=400N/mm², the find the permissible shear stress according to ASME standards.
- 72 n/mm²
- 76 n/mm²
- 268 n/mm²
- 422 n/mm²
Q19 | The stiffness of solid shaft is more than the stiffness of hollow shaft with same weight.
- true
- false
Q20 | The strength of hollow shaft is more than the strength of solid shaft of same weight.
- true
- false
Q21 | Solid shaft is costlier than hollow shaft of same weight.
- true
- false
Q22 | Solid shafts are used in epicyclic gearboxes.
- true
- false
Q23 | Flexible shafts have rigidity in torsion making them flexible.
- low
- high
- very high
- infinitely small
Q24 | Flexible shafts have rigidity in bending moment.
- high
- low
- very high
- extremely low
Q25 | A force 2P is acting on the double transverse fillet weld. Leg of weld is h and length l. Determine the shear stress in a plane inclined at θ with horizontal.
- psinθ(sinθ+cosθ)/hl
- p(sinθ+cosθ)/hl
- pcosθ(sinθ+cosθ)/hl
- none of the listed