140 TOP Objective Machine Design Questions and Answers pdf

111.    Aircraft body is usually fabricated by
(a) welding 
(b) precasting
(c) rivetting 
(d) casting
(e) unconventional methods.
Ans: c

112.    If two springs are in parallel then their overall stiffness will be
(a) half 
(b) same
(c) double 
(d) unpredictable
(e) none of the above.
Ans: c

113.    In hydrodynamic bearings
(a)    the oil film pressure is generated only by the rotation of the journal
(b)    the oil film is maintained by supplying oil under pressure
(c)    do not require external supply of lubricant
(d)    grease is used for lubrication
(e)    none of the above.
Ans: a

114.    Antifriction bearings are
(a)    sleeve bearings
(b)    hydrodynamic bearings
(c)    thin lubricated bearings
(d)    ball and roller bearings
(e)    none of the above.
Ans: e

115.    If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by
(a) ZN/p 
(b) p/ZN
(c) Z/pN 
(d) N/Zp
(e) Zp/N.
Ans: a

116.    The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
(a) 0.01 micron 
(b) 0.1 micron
(c) 1 micron 
(d) 10 microns
(e) 25 microns.
Ans: c

117.    In hydrostatic bearings
(a)    the Oil film pressure is generated only by the rotation of the journal
(b)    the oil film is maintained by supplying oil under pressure
(c)    do not require external supply of lubricant
(d)    grease is used for lubrication
(e)    none of the above.
Ans: b

118.    Oil in journal bearing should be applied at the point where load is
(a)     nil or lightest
(b)     maximum
(c)    average
(d)    any one of the above
(e)    unpredictable.
Ans: a

119.    The rated life of a bearing varies
(a)    directly as load
(b)    inversely as square of load
(c)    inversely as cube of load
(d)    inversely as fourth power of load
(e)    none of the above.
Ans: c

120.    In oiliness bearings
(a)     the oil film pressure is generated only by the rotation of the journal
(b)    the oil film is maintained by supplying oil under pressure
(c)    do not require external supply of lubricant
(d)    grease required to be applied after some intervals
(e)    none of the above.
Ans: c

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