ME 501 Full marks: 30

Time: 1 hr.Group- A

Answer all the questions 5x1=5

1. For a governor running at constant speed, what is the value of the force acting on the sleeve?

(a) Zero (b) Variable depending upon the load (c) Maximum (d) Minimum

2. The height of a simple Watt governor running at a speed ‘N’ is proportional to:

(a)N (b) 1/N (c) N2 (d) 1/N2

3. A Hartnell governor is a governor of the following type:

(a) inertia (b) pedulum (c) centrifugal (d) dead weight

4. Sensitiveness of a governor is defined as:

(a) Range of speed/ 2x Mean speed (b) 2x Mean speed /Range of speed ( c)Mean speed x Range of

speed (d) Range of spewed/Mean speed

5. For a given fractional change of speed, if the displacement of the sleeve is high, then the governor is

said to be:

(a) hunting (b) isochronous (c) sensitive (d) stable

Group- B

Attempt the questions 5x2=10

6. (a) A flywheel of steam engine has radius of gyration as 1.8m & weight 600 kg .Maximum fluctuation of engine is 50 KN-m If the mean speed of engine is 120 rpm. What will be the max speed?

OR(b) A punching machine is carried out 6 holes per minute, diameter of hole is 40 mm and thickness of plate is 35 mm. The punching operation requires 8 Nm of energy per unit mm2 of sheared area. The punch has stroke of 95 mm, if mean speed of flywheel is 20 m/s and fluctuation speed is 1.5% of mean speed on either side. Determine the mass of flywheel.

7. (a) Derive an expression of inertia torque for a reciprocating engine.OR

(b) Explain inertia force, inertia torque, crank effort and piston effort of a reciprocating engine.

Group- C

Answer any one question 15x1=15

9. A Porter governor has equal arms of each 250 mm long and pivoted on the axis of rotation. Each ball

has a mass of 5 kg and the mass of the central load on the sleeve is 15 kg. The radius of rotation of the

ball is 150 mm when the governor begins to lift and 200 mm when the governor is at maximum speed.

Find the minimum and maximum speeds and range of speed of the governor.

10. Calculate the minimum speed of a Proell governor which has equal arms of 200 mm and pivoted on

the axis of rotation. Mass of fly balls is 4 kg each and central mass on the sleeve is 20 kg. The lower links

are extended by 60 mm and parallel to the axis when the minimum radius of ball is 100 mm.