Design of Machine Members Mid - I, September - 2014

1.If the tearing efficiency for a riveted joints is 60% then the ratio of pitch to the diameter of rivet is
  • 0.2
  • 0.33
  • 2.5
  • 0.5
Answer: A
2.A bolt is specified by it’s
  • Major (or) nominal diameter
  • nominal (or) root diameter
  • Nominal diameter and pitch
  • root diameter and pitch
Answer: B
3.The neutral axis of a beam the shear stress is
  • Zero
  • Maximum
  • Minimum
  • Average
Answer: B
4.The stress concentration is caused due to
  • Variation in properties of material from point to point in a member
  • Pitting at the surface of the member where load is applied.
  • Abrupt change of the section.
  • All of the above.
Answer: C
5.Resistance to fatigue of a material is measured by
  • Young’s modulus
  • Elastic limit
  • Ultimate tensile strength
  • Endurance limit.
Answer: C
6.In order to obtain bolt of uniform strength
  • Increase shank diameter
  • Increase its length
  • Tighten the bolt properly
  • drill an axial hole through the thread up to the threaded portion such that the shank area is equal to root area of the thread .
Answer: A
7.The resilience of a bolt may be increased by
  • Increasing the shank diameter
  • Increase its length
  • Decrease its shank diameter
  • Decrease its length
Answer: D
8.Two shafts under pure torsion are of identical length and identical weight and are made up of same material. The shaft A is solid and the shaft B is hallow which shaft can transmit the maximum torque
  • Shaft B is better than A.
  • Shaft A is better than B
  • Both the shaft are equally good.
  • none of the above.
Answer: D
9.The poissions for steel varies from
  • 0.21 to 0.25
  • 0.25 to 0.33
  • 0.33 to 0.38
  • 0.38 to 0.45
Answer: D
10.Soderberg and Good man equation are concerned with the safety factors of
  • Static Stress
  • Variable stress
  • Stress concentration effect
  • creep effect.
Answer: B
11.In bolted joint with square threads the bursting force on the nut is………………………
Answer: Guest’s Theory
12.Turn buckle as ……………hand threads on one end …………………. hand threads on other end.
Answer: 11 Mpa
13.If the driving torque is applied at one end and the resisting torque at other end then the shafts are set to be……………………………….
Answer: P-d /p
14.Parallel fillet welded joints are designed for……………………….
Answer: Zero.
15.If one principal stress is zero at a point then other principal stress compare to the maximum shear stress at this point will be………………………………..
Answer: Left,right.
16.The lozenge joint is used for ……………………………strength
Answer: Series.
17.In dynamic loading the stress concentration is more in ……….
Answer:
18.The maximum shear stresses theory is also known as……………..
Answer: Twice
19.The normal stresses at a point are: = 10 Mpa, = 2 Mpa.The shear stress at this point is 4 Mpa.The maximum principal stress in Mpa at this point is ……………………………………….
Answer: Uniform strength
20.The tearing efficiency of a riveted joint is given by………………………….formula.
Answer: Ductile materials