# Gear Metrology - Mechanical Engineering (MCQ) questions and answers

1)   A gear has 30 teeth with module 4 mm and pressure angle of 20o. Calculate length of base tangent in a gear over 7 teeth space.

a. 21.25 mm
b. 90.23 mm
c. 62.53 mm
d. None of the above
 Answer  Explanation ANSWER: 90.23 mm Explanation: No explanation is available for this question!

2)   Spiral gears are used to transmit power when the shafts are

a. parallel
b. interesting
c. parallel and intersecting
d. neither parallel nor intersecting
 Answer  Explanation ANSWER: neither parallel nor intersecting Explanation: No explanation is available for this question!

3)   Which of the following statements is/are true?

a. Parkinson's gear tester is used to measure variation in centre distance
b. Tool maker's microscope is used to measure tooth thickness
c. Teeth having wider flanks have less strength
d. All the above statements are true
 Answer  Explanation ANSWER: Parkinson's gear tester is used to measure variation in centre distance Explanation: No explanation is available for this question!

4)   Smooth motion in involute tooth profile is possible due to

a. variation in pressure angle
b. constant pressure angle
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: constant pressure angle Explanation: No explanation is available for this question!

5)   Which type of tooth profile has double curvature?

a. cycloidal tooth profile
b. involute tooth profile
c. both a. and b.
d. none of the above
 Answer  Explanation ANSWER: cycloidal tooth profile Explanation: No explanation is available for this question!

6)   Calculate the tool width of a gear having 30 number of teeth and with module 5 mm.

a. 6.352 mm
b. 5.555 mm
c. 7.850 mm
d. none of the above
 Answer  Explanation ANSWER: 7.850 mm Explanation: No explanation is available for this question!

7)   Which formula is used to calculate diametral pitch?

a. (number of teeth) x (pitch circle diameter)
b. (pitch circle diameter) / (number of teeth)
c. (number of teeth) / (pitch circle diameter)
d. none of the above
 Answer  Explanation ANSWER: (number of teeth) / (pitch circle diameter) Explanation: No explanation is available for this question!

8)   Analytical checking of gears includes checking of

a. tooth profile
b. vibrations
c. noise level
d. all of the above
 Answer  Explanation ANSWER: tooth profile Explanation: No explanation is available for this question!

9)   Which of the following instruments is used to measure base pitch of a gear in base tangent method?

a. Gear tooth vernier caliper
b. David Brown tangent caliper
c. David Brown tangent comparator
d. David Brown tangent micrometer
 Answer  Explanation ANSWER: David Brown tangent comparator Explanation: No explanation is available for this question!

10)   Which of the following components are inspected by a Tool maker's microscope?

a. gauges