Engineering Mechanics

Chapter 34 : Transmission of Power by Gear Trains „„„„„ 717

QUESTIONS

1. Explain the advantages of gear drive over the belt and rope drives.


2. Distinguish between the terms pitch circle, addendum circle and dedendum circle.


3. What are the various types of gears? Explain each one of them with sketches.


4. Explain clearly the use of providing intermediate wheels in :

(a) a simple train of wheels, and

(b) a compound train of wheels.

5. Explain the procedure adopted for designing the spur wheels.


6. Discuss the working of train of wheels for the hour and minute hands of a 12-hour clock.


7. How will you find the velocity ratio of an epicyclic gear train by tabular method?


8. Explain with a neat sketch the sun and planet wheel.


9. Explain the working of an epicyclic gear train with bevel wheels.

OBJECTIVE TYPE QUESTIONS

1. Which of the following circle is an imaginary circle in the study of toothed gears

(a) Pitch circle (b) Addendum circle

(c) Dedendum circle (d) All of them

2. The pitch of a toothed wheel is

(a)

d

T

π

(b)

T

d

π

(c) Td

π

(d)

T

πd

where d= Diameter of the pitch circle, and

T= No. of teeth on the wheel.

3. Which of the following statement is correct?

(a) The gears are used for transmission of power.

(b) The gears are used where exact velocity ratio is required.

(c) In a single train of wheels, motion of both the driver and follower is like.

(d) Both (a) and (b).

(e) All (a), (b) and (c).

4. In a compound train of wheels, we provide idle wheels, which do not affect the velocity
   ratio of the system.
   (a) Agreez (b) Disagree


5. In an epicyclic gear train, one of the wheel is fixed and the other makes revolution about
   the fixed wheel.
   (a) True (b) False

ANSWERS

1. (a) 2. (a) 3. (e) 4. (b) 5. (a)

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