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DYNAMICS OF MACHINES

ASSIGNMENT I

1. What do you mean by term, Turning Moment Diagram?2. What do you mean by mean resisting torque? What are the conditions for a flywheel of a

steam engine to accelerate and to retard?

3. Explain the following terms:(i) Fluctuation of energy(ii) Fluctuation of speed(iii) Maximum Fluctuation of energy(iv) Maximum Fluctuation of speed(v) Coefficient of Fluctuation of energy(vi) Coefficient of Fluctuation of speed

4. Prove that the coefficient of fluctuation of speed ( Ks ) is given byKs =

Where = Maximum angular velocity of the flywheel and

= Minimum angular velocity of the flywheel

5. Explain clearly how the function of flywheel and governor differ from each other in asteam engine.

6. Derive the following expression for maximum fluctuation of energy (E ):(i) E = 2 (ii) E = m

Where E = K.E. of flywheel corresponding to mean speed =

Ks = Coefficient of fluctuation of speed

V = Linear velocity of the rim of the flywheel at the mean radius and

m = Mass of the flywheel

7. What is a punching press? Describe with a neat sketch the operation of the flywheel in apunching press.

8. Draw the turning moment diagrams for the following:(i) A single cylinder double acting steam engine(ii) Four stroke internal combustion engine(iii) Multi cylinder engine

9. Refer, understand and write the following Examples in the note book: 12.3, 12.5,12.13,12.14, 12.15, 12.16 and 12.19 ( Reference Theory of Machines by RK Bansal )

8/8/2019 Dom Assigiment

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Notes : (i) Assignment is to be submitted latest by 30 Sep 2010

(ii) Assignment should be in the form of Note book(iii) Past this assignment page in the note book just before the start of writing

assignment.

DYNAMICS OF MACHINES

ASSIGNMENT II

1. Define and explain the term Balancing of Rotating Masses. What will be the harm if therotating parts of a high speed engine are not properly balancing.

2. Describe the procedure of balancing of a mass attached to a shaft rotating at angularspeed of rad/s by

(i) A single mass only(ii) Two masses in different planes

3. Describe the procedure of balancing of several masses attached to a shaft rotating inthe same plane at angular speed of rad/s by : Analytical and Graphical methods

4. Describe the procedure of balancing of several masses attached to a shaft rotating inthe different planes at angular speed of rad/s by : Analytical and Graphical methods

5. What do you mean by reference plane.6. And Refer, understand and write the following Examples in the note book: 13.1,

13.2,13.3, 13.4 and 13.8 ( Reference Theory of Machines by RK Bansal )

Notes : (i) Assignment is to be submitted latest by 20 Oct 2010 ( After CW Games)

(ii) Assignment should be in the form of Note book

(iii) Past this assignment page in the note book just before the start of writingassignment.