Design of Machine Elements Mid - II, November - 2014

1.The most suitable bearing for resisting heavy loads under slow speed is
  • hydrodynamic bearing
  • ball bearing
  • roller bearing
  • hydrostatic bearing
Answer: D
2.The ratio of bending stress in full length leaves to graduated leaves is
  • 2/3
  • 3/2
  • 4/3
  • 3/4
Answer: B
3.Coefficient of friction in journal bearing is a function of
  • ZN/P
  • d/c
  • l/d
  • all the above
Answer: D
4.In a connecting rod used in a 4-stroke I.C engine, the bolts are stressed
  • in tension only
  • in compression only
  • zero to compression
  • none of the above
Answer: C
5.The crank web in a crankshaft is subjected to
  • direct stress
  • bending stress
  • shear stress
  • all the above
Answer: D
6.Most of the connecting rods are made with ______ section
  • C-section
  • I- section
  • T –Section
  • none of these
Answer: B
7.Piston rings are made of _____________
  • Cast iron
  • aluminium alloy
  • both a & b
  • none of these
Answer: C
8.Piston pin is subjected to
  • bearing action
  • bending action
  • transverse shear
  • all the above
Answer: D
9.The cross section of the piston rod is
  • circular
  • rectangular
  • square
  • I- section
Answer: A
10.Piston designed for heat transfer must also be designed to prevent the distortion of
  • skirt
  • piston head
  • both a& b
  • none of these
Answer: A
11.The helical springs subjected fatigue loading are designed by using __________________.
Answer: Soderberg’s line method
12.In helical compression spring the force due to initial compression is considered as ______________.
Answer: Zero
13.The type of springs used, where the space is relatively small and large amount of energy must be stored are _____________.
Answer: Spiral torsion spring
14.In leaf spring, the longest leaf is known as _______________.
Answer: Master leaf
15.If two springs of same size are parallel, then their overall stiffness will be ___________.
Answer: Double
16.In hydro dynamic lubrication, the journal is supported by the lubricant, when the journal is ________.
Answer: Rotating
17.Any one good characteristics of good bearing material ____________.
Answer: High compressive strength
18.Connecting rod is connected to the pistons through _______________.
Answer: Gudgeon pin
19.The crank shaft may be treated as _________________ beam.
Answer: Simply supported
20.Circlips is also known as _____________.
Answer: Snap ring