Design of Machine Elements Mid - I, September - 2014

1.Another name of Von Mises and Henky theory is
  • Maximum strain theory
  • Maximum strain energy theory
  • Guest theory
  • Distortion energy theory
Answer: D
2.The fit on hole –shaft system is specified s H7-j6, this type of fit is
  • light press fit
  • force fit
  • Push fit
  • Easy push fit
Answer: D
3.Rivets are generally specified by
  • Shape of head
  • diameter of head
  • diameter of shank
  • overall length
Answer: C
4.Thickness of plate is greater than 8 mm , the diameter of rivet is worked out by the relation
  • d = 2√ t
  • d = 4√ t
  • d = 6√ t
  • d = 8√ t
Answer: C
5.In square threads , the depth d and pitch p is related by identity
  • d = 0.25 p
  • d = 0.5 p
  • d = 0.75 p
  • d = 1 p
Answer: B
6.The bench vise is usually provided with ___________ type of thread.
  • square
  • buttress
  • ACME
  • Knuckle
Answer: C
7.German silver contains _____________ % of silver.
  • 12.5
  • 5
  • 1
  • 0
Answer: D
8.Which alloy of aluminum is often used for aero plane and automobile parts
  • duralumin
  • Magnesium
  • RR-53
  • aluminum bronze
Answer: A
9.The series factor for R 20 preferred number series is
  • (20)1/10
  • √ (20)
  • (10)1/20
  • (20)1/3
Answer: C
10.The taper in cotter joint is usually
  • 1 in 24
  • 1 in 8
  • 1 in 100
  • 1 in 48
Answer: D
11.Rankine’s theory of failure is applicable for _________________ type of materials .
Answer: Brittle
12.The stress produced in a member due to falling load is known as ___________ .
Answer: Impact stress
13.When a material is subjected to varying stresses, it fails under stress well below than the ultimate stress or yield stress, such type of material failure is known as _____________ failure .
Answer: Fatigue
14.The fatigue limit of a material is the maximum magnitude of completely reversed loaded stress that can withstand for an unlimited number of cycles without fatigue failure. This value can be obtained from ___________ curves.
Answer: S – N or stressVs number of cycles
15.The surface finish factor for the eye glasses is taken as ___ .
Answer: 1or unity
16.As a general practice , if the ultimate stress is known , the yield stress is assumed as _____ % of the ultimate stress.
Answer: 55%
17.In riveting the edges of the plates are beaten up by the tool to prevent the leakages, if the tool thickness is equal to the thickness of the plates, this operation is known as ___________ .
Answer: Fullering
18.As a general practice the bolt is specified by its _____________ and pitch.
Answer: Nominal diameter
19.The resilience of the bolt can be increased by increasing its _____________.
Answer: Length
20._______________ threads have higher efficiency in either directions of power transmission
Answer: Square