The torque exerted on the crank shaft of a two stroke engine is given by the equation: T(N-m) = 14 500 + 2300 sin 20 – 1900 cos 20 OS where 0 is the crank angle displacement from the inner dead centre. Assuming the resisting torque to be constant, determine: 1. The power of the engine when the speed is 150 r.p.m. ; 2. The moment of inertia of the flywheel if the speed variation is not to exceed ± 0.5% of the mean speed; and 3. The angular acceleration of the flywheel when the crank has turned through 30° from the inner dead [Ans. 228 kW; 1208 kg-m²; 0.86 rad/s²] centre.

Q.2 A 75-kW induction motor runs at 740 rpm in clock direction as shown in the figure. A 19 teeth helical pinion with 20 degrees normal pressure angle, 10 mm normal module and a helix angle of 23 degrees is keyed to the motor shaft. Find: a) The transverse pressure angle. b) The pitch diameter of the pinion c) The pitch line velocity. d) Tangential, radial, axial and normal forces on the pinion. 750 200 ZIM 2₁ 19

The pinion (gear 2 on shaft a) rotates at 635 rev/min clockwise and transmits 1305 W through the idler pair (gears 3 and 4 on shaft b) to the output gear (gear 5 on shaft c). Gears 2 and 3 have a module of 2 mm, and gears 4 and 5 have a module of 3 mm. Pressure angles are all 20 degrees. Solve for the magnitude of the force that shaft b must apply to gears 3 and 4 to maintain static equilibrium in the figure shown here. The figure is not to scale. Please give your answer in units of newtons. geard 615 verimin m₂ = M₁ = 2mm 187 327 187 487 MG M₁ = ₂ = 3mm 0=20° I solved it and дог 692.60 Х សុំ But fr is not correct

Fig Q1 shows a two-stage spur gearbox. The input shaft is coupled to a motor. The shaft "b" turns freely in bearings C and D, except for the gear-tooth forces. Assuming 100% gear efficiency, determine the resultant radial loads applied to bearings C and D, and sketch the shaft "b" as a free body in equilibrium.