Spur Gears - Mechanical Engineering (MCQ) questions and answers

1)   What is the load stress factor for cast iron gear pair if BHN = 300?

a. 1.89 N/mm2
b. 1.62 N/mm2
c. 1.44 N/mm2
d. 1.413 N/mm2
Answer  Explanation 

ANSWER: 1.89 N/mm2

Explanation:
No explanation is available for this question!
2)   Which gear is used if the axes of two shafts are neither intersecting nor parallel?

a. Hypoid gears
b. Worm gears
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!
3)   If (σb  x Y)pinion > ( σb  x Y)gear then ________ is designed for bending.

a. pinion
b. gear
c. both a. and b.
d. none of the above
Answer  Explanation 

ANSWER: gear

Explanation:
No explanation is available for this question!
4)   Which of the following gear tooth failures is/are induced when maximum Hertz contact stress on gear tooth surface exceeds surface endurance strength of tooth?

a. Abrasive strength
b. Corrosive wear
c. Destructive pitting
d. Galling
Answer  Explanation 

ANSWER: Destructive pitting

Explanation:
No explanation is available for this question!
5)   What is Scuffing?

a. Lubrication failure
b. Surface fatigue failure
c. Surface injury on matting teeth surfaces
d. Wear due to chemical action by lubricants
Answer  Explanation 

ANSWER: Lubrication failure

Explanation:
No explanation is available for this question!
6)   What is the deformation or dynamic factor if sum of errors on meshing teeth of steel pinion and gear is 32 x 10-3 mm?

a. 284.8 N/mm
b. 300.23 N/mm
c. 320.5 N/mm
d. 368 N/mm
Answer  Explanation 

ANSWER: 368 N/mm

Explanation:
No explanation is available for this question!
7)   In force analysis of spur gears which component of force assists the rotation on driven gear?

a. Axial component
b. Radial component
c. Tangential component
d. All of the above
Answer  Explanation 

ANSWER: Tangential component

Explanation:
No explanation is available for this question!
8)   What are the advantages of smaller pressure angles?

a. High radial force
b. High separating force
c. High contact ratio
d. All of the above
Answer  Explanation 

ANSWER: High contact ratio

Explanation:
No explanation is available for this question!
9)   In which of the following processes, tooth ends are made thinner?

a. Backlash effect
b. Crowing of gear tooth
c. Hunting of gear tooth
d. None of the above
Answer  Explanation 

ANSWER: Crowing of gear tooth

Explanation:
No explanation is available for this question!
10)   Spiral gears are used only if the axes of two shafts are non-intersecting, non-parallel and __________.

a. perpendicular
b. parallel
c. non-perpendicular
d. none of the above
Answer  Explanation 

ANSWER: non-perpendicular

Explanation:
No explanation is available for this question!

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