EXPERIMENT. No.7


                                                 EXPERIMENT. No.7
10.0 Questions for confirmation of learning
1. The Inertia governors have an advantage over the centrifugal governor because they give more rapid response to the change of load since the displacement of the governor balls is determined by the rate of change of speed of the engine shaft. However it is not possible to achieve the complete balance of revolving parts of the inertia governor. Due to this disadvantage of the inertia governors , these are not used usually compared to centrifugal governors.
2. Spindle, Flyballs, sleeve, arms, links, bell crank lever, bevel gear.
3. decreases.
11.0 The Inertia governors have an advantage over the centrifugal governor because they give more rapid response to the change of load since the displacement of the governor balls is determined by the rate of change of speed of the engine shaft. However it is not possible to achieve the complete balance of revolving parts of the inertia governor. Due to this disadvantage of the inertia governors , these are not used usually compared to centrifugal governors.
12.0 Conclusion/ results :                                                                
                        2. increase.      3. continuous.           4. range of speed.
5. As the speed of governor changes the displacement of sleeve will also change and it will rise. When speed decrease the lift of the sleeve reduces and it will fall down. The radius of rotation of flyballs will also increase when speed of governor increases.
13.0 Questions:
1.To regulate the mean speed of an engine when there are variations in  the  
    load.
            2.a) Stability:  A governor is said to be stable when for every speed within the working range there is a definite configuration.
               b) Sensitiveness: it is defined as the ratio of the difference between max. and min. equilibrium speeds to the mean equilibrium speed.
                    3. A governor is said to be isochronous when the equilibrium speed is constant for all radii of rotation of the balls within the working range neglecting friction.
4.    Isochronous governor is not of practical use because the sleeve will move to one of it’s extreme positions immediately the speed deviates from the isochronous speed.
5.    Due to efficiency of results and construction and easy working conditions the centrifugal governors are preferred over inertia governors.
6.    A governor is stable when for every speed within the working range there is a definite   configuration.
7.                  Porter governor                                                   Proell governor
       *  It is modification of watt governor.     * It is  modification of porter governor.
       * Mass of flyballs is large.                     * Mass of flyballs is small
       * Flyballs are connected to arms.          * Flyballs are connected to extension  
                                                                        of the links.
8.  Effort of governor is the mean force exerted at the sleeve for a given  
      percentage change of Speed.
9. A governor is said to be hunt if the speed of the engine fluctuations  
     continuously above and below the mean speed.
10. Sensitiveness of governor is defined as the ratio of the difference between  
     max. and min. equilibrium speed to the mean equilibrium speed .
11. a) Read the information regarding governors . b) See whether the pivots and other joints of  links and arms are properly fitted. C) If some of the joints are loose ,then tighten them properly. d) When governor is picking up speed don’t try to stop or mishandle it.  e) Keep yourself away with safe distance from the rotating balls.


Comments

Post a Comment

Popular posts from this blog

EXPERIMENT NO.4

Image
Experiment No.4 11.0 Questions for confirmation of learning: 1. Rate of change of linear displacement of a body w.r.t. time. 2. Rate of change of linear velocity of a body  w.r.t. time. 4. ω = 2πN / 60 12. Conclusion / Results: 1. slider crank mechanism     2. velocity and acceleration of reciprocating mechanism.   3. N coincides with O      Advantages of the method – 1. Separate velocity and acceleration diagram not                       required.   2. Drawing of perpendicular and parallel lines and transforming                       them on particular place is avoided. 3. Simple construction  4. Less space                ...
Read more

EXPERIMENT No. 5

Image
                                                      EXPERIMENT No. 5 7.0    1. Stepwise procedure for drawing displacement diagram- 1. By taking proper scale mark out stroke, dwell, return stroke and dwell as per the data   given in problem. 2. Mark lift of follower on vertical line. 3. make divisions as per the motion of follower. like Uniform velocity, SHM, and uniform acceleration and retardation. 4. Make same no. of equal divisions( as that of vertical lift of follower.) of the out stroke and return stroke. 5. By considering motion of the follower connect the points to form a straight line or a curve, as the case may be.             2.  Stepwise procedure for drawing cam profile. 1. 1.With proper scale draw the di...
Read more

EXPERIMENT NO.10

Image
                                            Expt. No.10 10.0  Questions for confirmation of learning 1. The process of providing the second mass in order to counteract the effect of the centrifugal force of the first mass is called balancing of rotating masses. 2. a) To reduce vibrations and bending of the shafts. b) To minimize noise production. c) To provide max. efficiency. d) To prevent wear and tear. 3 . a) Neglect. b) Attention. c) Poor knowledge. d) Wrong calculations. 4 . Unbalanced                                                              ...
Read more