Theory of Machi...

In a four-bar mechanism, the lengths of driver crank, coupler and follower link are 150 mm, 250 mm and 300 mm respectively. The fixed link length is L₀. Find the values of L_o so as to make it crank-crank mechanism.

A flywheel is fitted to engine has a mass of 400kg and radius of gyration 0.2m. If initially engine is at rest and starting torque of engine is 400Nm. What is kinetic energy (kJ) of flywheel after 10 seconds?

If angle of obliquity of pair of gear wheels is 18˚. What is minimum number of teeth on pinion if arc of approach or recess not less than the pitch?

Two 20° pressure angle involute gears in mesh have a module of 10 mm. The larger has 50 teeth and the pinion has 13 teeth. The centre distance between them is

The controlling force in a spring controlled governor is 1500 N when the radius of rotation of the balls is 200mm and 887.5 N when it is 130 mm the mass of each ball is 8 kg by changing the initial tension the governor behaves as isochronous governor. Then

The moment of inertia an airplane air screw is 20 kg.m² and the speed of rotation is 1000 rpm clockwise when viewed from the front. The speed of the flight is 200 km per hour. Find the gyroscopic acceleration (rad²/sec²) of the air screw on the airplane when it makes a left-handed turn on a path of 150 m radius 

The turbine rotor of a ship has a mass of 8 tonnes and a radius of gyration 0.6 m. It rotates at 1800 rpm clockwise, when looking from the stern. Determine the gyroscopic couple (in kN-m) if the ship travels at 100 km/hr and steer to the left in a curve of 80 m radius.

A machine tool requires a torque of 100 + 20 sin θ N-m of torque, where θ is the crank angle. The power is supplied by an electric motor at uniform rate. A flywheel with a moment of inertia of 20 kg-m² is attached. The maximum acceleration of the flywheel and the corresponding crank position is

In a gear box, two meshing gears (Gear and pinion) of involute profile have a module of 5 mm with pressure angle ϕ =20° and a Gear ratio of 3. The number of teeth on Gear is 60 and take addendum as one module. At the end of engagement, if the pinion is rotating with a speed of 20 rad/s, the sliding velocity is