# 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 2

*d*, 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

*P*=

_{max}*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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