GOVERNOR OBJECTIVE QUESTIONS

1. The ratio of height of porter governor (when length of arms and links are equal) to the height of watt governor is (Where m is the mass of the ball and M is the mass of sleeve)

a. (m+M)/m                   b. M/(m+M)

c. m/(m+M)                   d. None of the above

2. A governor is said to be isochronous when equilibrium speed of all radii of rotation of the balls with in the working range

a. Is constant                b. Varies uniformly

c. Is not constant          c. None of the above

3. A Hartnell governor is a governor of the

a. inertia type                         

b. pendulum type

c. spring controlled type                

d. dead weight type

4. Which one of the following is a Dead weight type governor?

a. Porter Governor         

 b. Hartnell Governor                            c. Wilson-Hartnell Governor            d. Hartung Governor

5. Height of a Governor is distance measured from

a. the centre of two balls mass

b. the centre of balls mass to the point of intersection of upper arms

c. the centre of balls mass to the point of intersection of  lower links

d. the point of intersection of upper arms to the point of intersection of  lower links

6. Which of the following is pendulum type of Governor?

a. Watt Governor             

b. Proell Governor           

c. Porter Governor                            

d. Hartnell Governor

7. Which of the following Governor is not suitable for High speeds

a. Watt Governor             

b. Hartnell Governor      

c. Wilson-Hartnell Governor       The ratio of height of porter governor (when length of arms and links are equal) to the height of watt governor is (Where m is the mass of the ball and M is the mass of sleeve)

a. (m+M)/m                   b. M/(m+M)

c. m/(m+M)                   d. None of the above

2. A governor is said to be isochronous when equilibrium speed of all radii of rotation of the balls with in the working range

a. Is constant                b. Varies uniformly

c. Is not constant          c. None of the above

3. A Hartnell governor is a governor of the

a. inertia type                            b. pendulum type

c. spring controlled type                d. dead weight type

4. Which one of the following is a Dead weight type governor?

a. Porter Governor          b. Hartnell Governor      c. Wilson-Hartnell Governor        d. Hartung Governor

5. Height of a Governor is distance measured from

a. the centre of two balls mass

b. the centre of balls mass to the point of intersection of upper arms

c. the centre of balls mass to the point of intersection of  lower links

d. the point of intersection of upper arms to the point of intersection of  lower links

6. Which of the following is pendulum type of Governor?

a. Watt Governor             b. Proell Governor           c. Porter Governor          d. Hartnell Governor

7. Which of the following Governor is not suitable for High speeds

a. Watt Governor             b. Hartnell Governor      c. Wilson-Hartnell Governor        d. Hartung Governor

9. Which of the following Governor can never be isochronous?

a.  Watt Governor            

b. Proell Governor           

c. Porter Governor          

d. Hartnell Governor

8. The sensitiveness of a Governor is

a. (N2+N1)/N                     

 b. (N2-N1)/N                       

c. (N2+N1) x N                    

d. N/(N2-N1)

Where N1=Minimum equilibrium speed

N2=Maximum equilibrium speed

N=Mean speed

9. Which of the following Governor can never be isochronous?

a.  Watt Governor            

b. Proell Governor           

c. Porter Governor          

d. Hartnell Governor

RANKINE CYCLE ( VAPOUR POWER CYCLE) IN THERMAL POWER PLANTS

EFFICIENCY OF OTTO CYCLE CALCULATION

GEOMETRY OF VARIOUS GEARS

GEOMETRY OF DIFFERENT TYPES OF GEARS

HELICAL GEAR

DOUBLE HELICAL GEAR

HYPIOD GEAR

MITRE GEAR

RACK AND PINION

SPIRAL BEVEL GEAR

SPUR GEAR

STRAIGHT BEVEL GEAR   

WORM AND WORM WHEEL

GEAR TERMINOLOGY

The following are the important dimensions and geometries concerned with toothed gear:

Pitch Circle :

Pitch circle is the apparent circle that two gears can be taken like smooth cylinders rolling without friction.

Addendum Circle :

Addendum circle is the outer most profile circle of a gear. Addendum is the radial distance between the pitch circle and the addendum circle.

Dedendum Circle :

Dedendum circle is the inner most profile circle. Dedendum is the radial distance between the pitch circle and the dedendum circle.

Clearance :

Clearance is the radial distance from top of the tooth to the bottom of the tooth space in the mating gear.

Backlash :

Backlash is the tangential space between teeth of mating gears at pitch circles.

Full Depth :

Full depth is sum of the addendum and the dedendum.

Face Width :

Face width is length of tooth parallel to axes.

Diametral Pitch :

Diametral pitch (p) is the number of teeth per unit volume.

p =  (Number of Teeth) / (Diameter of Pitch circle)

Module :

Module (m) is the inverse of diametral pitch.

m = 1/p

Circular Pitch :

Circular pitch is the space in pitch circle used by each teeth.

Gear Ratio :

Gear ratio is numbers of teeth of larger gear to smaller gear.

Pressure Line :

Pressure line is the common normal at the point of contact of mating gears along which the driving tooth exerts force on the driven tooth.

Pressure Angle :

Pressure angle is the angle between the pressure line and common tangent to pitch circles. It is also called angle of obliquity. high pressure angle requires wider base and stronger teeth.

Pitch Angle :

Pitch angle is the angle captured by a tooth.

Pitch angle = 360/T

Contact Ratio :

Contact ratio is angle of angle of action and pitch angle.

Path of Approach :

Path of approach is the distance along the pressure line traveled by the contact point from the point of engagement to the pitch point.

Path of Recess :

Path of recess is the distance traveled along the pressure line by the contact point from the pitch point to the path of disengagement.

Path of Contact :

Patch of contact is the sum of path of approach and path of recess.

Arc of Approach :

Arc of approach is the distance traveled by a point on either pitch circle of the two wheels from the point of engagement to the pitch.

Arc of Recess :

Arc of recess is the distance traveled by a point on either pitch circle of the two wheels from the point to the point of disengagement.

Arc of Contact :

Arc of contact is the distance traveled by a point on either pitch circle of the two wheels during the period of contact of a pair of teeth.

Angle of Action :

Angle of action is the angle turned by a gear during arc of contact.

SINGLE POINT CUTTING TOOL GEOMETRY