Q.
Q1.
A. Explain the procedure for drawing cam profile.
B. Two Shafts are connected by a Hooke joint. The driving shaft rotates at a uniform speed of 1200rpm. The angle between the shafts is 150. Calculate the maximum and minimum speeds of driven shaft. When is the acceleration of the driven shaft maximum?
Q2.
A. What is a flywheel? How does it different from governor
B. An aeroplane makes a compete half circle radius towards left when flying at 210 km/h. The rotary engine and the propeller of the plane is of 50 kg mass having a radius of gyration of 300 mm. The engine rotates at 2400 rpm clockwise as seen from the rear. Find the gyroscopic couple on the aircraft and its effect on the plane.
Q.3
A. Explain in brief about centrifugal governor.
B. The angle between two shafts is150. They are joined by two spiral gears having a normal circular pitch of 8 mm and gear ratio of 3. If the approximate center distance between the shafts is 250 mm and friction angle 60, determine for the maximum efficiency of the drive (a) the number of teeth, (b) The exact center distance, (c) pitch diameters, and (d) the efficiency
Q.4
A. What are the methods to determine the velocities of links mechanisms?
B. A shaft running at 200 rpm drives another shaft at 400 rpm, and transmits 7.5 kW through an open belt. The belt is 80 mm wide and 10 mm thick. The center distance is 4 m. The smaller pulley is of 500 mm diameter and the coefficient of friction between the belt and pulley is 0.30. Calculate the stress in the belt.
Q.5
A. State the laws of friction. What are its different types?
B. A V-twin engine has the cylinder axes at right angles and the connecting rods operate a common crank. The reciprocating mass per cylinder is 10 kg and the crank radius is 80 mm. The length of connecting rod is 0.4 m. Show that the engine may be balanced for primary forces by means of a revolving balance mass. If the engine speed is 600 rpm, what is the value of maximum resultant secondary force?
Q.6
A. What are the different types of mechanisms?
B. Explain in brief about planetary gear Trains
C. Explain the different types of Brakes.
