SECTION-1

Theory of Machine objective type questions/Multiple choice questions

Q51. The face of the tooth is the

(a) surface of the top of tooth

(b) surface of tooth pitch surface

(c) width of tooth below the pitch surface

(d) width of tooth measured along the pitch circle

Ans: (b) surface of tooth pitch surface

Q52. The ratio of the number of teeth to the pitch circle is called

(a) circular pitch

(b) diametral pitch

(c) module

(d) none of these

Ans: (b) diametral pitch

Q53. The contact ratio is the ratio of

(a) length of pair of contact to the circular pitch

(b) length of arc of contact to the circular pitch

(c) length of arc of approach to the circular pitch

(d) length of arc of recess to the circular pitch

Ans: (b) length of arc of contact to the circular pitch

Q54. In involute gears, the pressure angle is

(a) on the size pf teeth

(b) dependent on the size of gears

(c) always. constant

(d) always variable

Ans: (c) always. constant

Q55. 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

Ans: (c) 18

Q56. In a gear having involute teeth, the normal to the involute is a tangent to the

(a) pitch circle

(b) base circle

(d) dedendum circle

Ans: (b) base circle

Q57. An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

(a) tip of the gear tooth and flank of pinion

(b) tip of the pinion and flank of gear

(d) tip of both gear and pinion

(c) flanks of both gear and pinion

Ans: (a) tip of the gear tooth and flank of pinion

Q58. Which of the following statement is correct for involute gears?

(a) the interference is inherently absent

(b) The variation in centre distance of shafts

(c) A convex flank is always in contact with concave flank increases radial force.

(d) The pressure angle is constant throughout the teeth engagement.

Ans: (d) The pressure angle is constant throughout the teeth engagement.

Q59. The contact ratio for gear is

(a) zero

(b) less than one

(c) greater than one

(d) infinity

Ans: (c) greater than one

Q60. The gear train usually employed in clocks is a

(a) simple gear train

(b) reverted gear train

(c) sun and planet gear

(d) differential gear

Ans: (b) reverted gear train

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##### Read More Sections of Theory of Machine Objective Questions

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Theory of Machine MCQ – Section-1

Theory of Machine MCQ – Section-2

Theory of Machine MCQ – Section-3

Theory of Machine MCQ – Section-4

Theory of Machine MCQ – Section-5

Theory of Machine MCQ – Section-6

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