Q1. Spring stiffness is
(A)  ratio of coil diameter to wire diameter
(B)  load required to produce unit deflection
(C)  its capability of storing energy
(D)  its ability to absorb shocks

Q2. When two springs are in series (having stiffness K), the equivalent stiffness will be
(A) K 
(B) K/2
(C) 2K 
(D) KIA

Q3. When a close coiled helical spring is compressed, its wire is subjected to
(A)  tension
(B)  shear
(C)  compression
(D)  all of the above

Q4. If a spring is cut down into two springs, the stiffness of cut springs will be
(A)  half
(B)  same
(C)  double
(D)  unpredictable

Q5. Belt slip may occur due to
(A)  heavy load
(B)  loose belt
(C)  driving pulley too small
(D)  all of the above

Q6. Aircraft body is usually fabricated by
(A) welding 
(B) precasting
(C) rivetting 
(D) casting

Q7. If two springs are in parallel then their overall stiffness will be
(A) half 
(B) same
(C) double 
(D) unpredictable

Q8. 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

Q9. Antifriction bearings are
(A)  hydrodynamic bearings
(B)  thin lubricated bearings
(C)  ball and roller bearings
(D)  none of these

Q10.  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

Q11. 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) 12 microns

Q12. 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

Q13. 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 these

Q14. 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

Q15. In V-belt drive, belt touches
(A)  at bottom       
(B) at sides only
(C)  both at bottom and sides
(D)  could touch anywhere

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