Practice Test: Question Set - 24
1. In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called
- (A) Normal pitch
- (B) Axial pitch
- (C) Diametral
pitch
- (D) Module
2. The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be
- (A) 12
- (B) 14
- (C) 18
- (D) 24
3. In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to
- (A) Reduce
vibration
- (B) Reduce slip
- (C) Ensure
uniform loading
- (D) Ensure
proper alignment
4. According to Rankine's theory, the failure occurs at a point in a member
- (A) When
the maximum shear stress in a biaxial stress system reaches the shear stress at
elastic limit in a simple tension test
- (B) When
the maximum principal stress in a biaxial stress system reaches the elastic limit
of the material in a simple tension test
- (C) When
the strain energy per unit volume in a biaxial stress system reaches the strain
energy at the elastic limit per unit volume as determined from a simple tension
test
- (D) When
the maximum principal strain in a biaxial stress system reaches the strain at
the elastic limit as determined from a simple tension test
5. Which one of the following loading is considered for the design of axles?
- (A) Bending
moment only
- (B) Twisting
moment only
- (C) Combined
bending moment and twisting moments
- (D) Combined
action of bending moment, twisting moment and axial thrust
6. Lewis equation in gears is used to find the
- (A) Tensile
stress in bending
- (B) Shear
stress
- (C) Compressive
stress in bending
- (D) Fatigue
stress
7. A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be
- (A) 5 mm
- (B) 10 mm
- (C) 15 mm
- (D) 25 mm
8. The elasticity is the property of a material which enables it to
- (A) Regains
its original shape after deformation when the external forces are removed
- (B) Draw
into wires by the application of a tensile force
- (C) Resists
fracture due to high impact loads
- (D) Retain
deformation produced under load permanently
9. A locking device extensively used in marine type connecting rod ends is a
- (A) Jam nut
- (B) Castle nut
- (C) Sawn nut
- (D) Ring nut
10. For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be
- (A) 4
- (B) 6
- (C) 8
- (D) 10
11. When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the
- (A) Initial
tension
- (B) External
load applied
- (C) Sum
of the initial tension and external load applied
- (D) Initial
tension or external load, whichever is greater
12. The shock absorbing capacity of a bolt can be increased by
- (A) Tightening
it properly
- (B) Increasing
shank diameter
- (C) Grinding
the shank
- (D) Making
shank diameter equal to core diameter of thread
13. According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)
- (A) d = t
- (B) d =
1.6 t
- (C) d = 2 t
- (D) d = 6 t
14. When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,
- (A) Bevel
gearing
- (B) Helical
gearing
- (C) Worm gearing
- (D) None
of these
15. Which of the following statement is wrong?
- (A) The pitch of
rivets is obtained by equating the tearing resistance of the plate to the
shearing resistance of the rivets
- (B) The pitch of
rivets should not be less than 2d, where d is the diameter of
rivet hole
- (C) The
maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per
I.B.R., is given by Pmax = C.t + 41.28 mm
- (D) According to
I.B.R., the thickness of butt strap shall not be less than 5 mm
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