Theory of Machi...

A 20° gear set has an addendum of 12mm and a module of 8mm. If the pinion has 20 teeth and the gear has 36 teeth, then the center distance is __________m. (round up to two decimals)

In a 20˚ full depth involute gear system, centre distance between pinion and gear is 120 mm. If module of gear is 4 mm and number of teeth is 40, then number of teeth on pinion is___

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?

A flywheel has moment of inertia of 11.8 kg-m². What is the maximum fluctuation of speed of the flywheel for a fluctuation energy of 2049 joules? The mean speed of the flywheel is 180 rpm.

In case of rotating masses, the magnitude of the balancing mass is ______ when the speed of the shaft is doubled.

An aeroplane makes a complete half circle of 50 metres radius, towards left, when flying at 50 m/s. The rotary engine and the propeller of the plane has a mass of 400 kg and a radius of gyration of 0.3 m. The engine rotates at 2400 r.p.m. clockwise when viewed from the rear. Find the gyroscopic couple on the aircraft (in kN.m)

The equation of the turning moment diagram for the three crank engine is given by: (T(N-m) = 25000 - 7500 sin 3θ) where θ radians is the crank angle from inner dead centre. The moment of inertia of the flywheel is 400 kg-m² and the mean engine speed is 300 rpm. Calculate the power of the engine.

In a cam-follower, the follower rises by 80 mm as the cam rotates 0.3 radians at constant angular velocity of 6 rad/sec. The follower is uniformly accelerating during the first half and it is uniformly decelerating in the later half. Assuming the same magnitudes of the acceleration and deceleration, the maximum velocity of the follower in m/s is________?

A flywheel of 160 kg.m² is used to control the speed fluctuation in an electric shaper machine. The machine uses a motor which supplies the power at a uniform rate of 1.2 kW. The crank of the shaper runs at 20 rpm and the quick return ratio is 2. Assuming that power is required only during the cutting stroke calculate the fluctuation of speed of flywheel as a percentage of the mean speed of 240 rpm.