transmitted from a pulley | m diameter running at 200 v, |, s of @ belt, Find the speed lost by the driven pulley as a resy, side of the belt is 1.4 MPa and 0.5 MPa respeciivel,, 7, ¢ belt is 100 MPa. 1 I e . . o = 1 AMDa =14 % 1Y

A 25-hp. 1750-rpm electric motor drives a machine through a multiple V-belt. The size 5V belts has unit weight of 0.012 lbf/in.) The pulley on the motor shaft has a 3.7-in. pitch diameter and geometry is such that the angle of wrap, o is 165º. k is consenvatively assumed that the maximum belt tension (F1) should be limited to 150 lbf, and that the coefficient of friction will be at least 0.512. [Hints: Use equations 17.18, 17.21, (h)]

P.

3. A motor is connected by a belt to pulley B. T, is the tight-side tensile force equal to 1800 N. The shaft spins at a constant speed, 650 rpm. The power delivered by the motor is 12.6 kW. On pulley A, connected to the load, the slack side of the belt has a tension equal to th of the tight side. b T T, B d shaft Dimensions are as follows: da 200 тm 300 тт | 250 тm |180 тm | 250 тm 26 тm dB dahaft a We analyzed a problem similar to this on Test 01 using static failure theories. Is this strictly correct? Because the shaft is spinning, would not a material particle see a time-varying reversal of the the bending stress as in the R.R. rotating beam test? Would a particle see a reversal of the torsional shear stress? Assume Sut = 370 MPa and Sy = 300 MPa. Ignore Marin factors. Ignore stress concentrations. Ignore direct shear stress (that due to V). Find the safety factors with respect to fatigue and yielding. Be guided by section 6-14 on combined loading.

Parvinbhai

A (25 kW, 500 rpm) motor has a mild steel shaft of (30 mm) diameter and (8 cm) length. There are two parallel keys available A (w = 12 mm, t = 10 mm) and B (w = 10 mm, t = 8 mm), suggest one of them to connect the shaft with a pulley. use torsional shear stress = 160 MPa, tensile strength = 400 MPa, compression strength=280 MPa, bending strength= 380, factor of safety=3. Hello, I need an accurate handwritten answer in 15 minutes, please

Consider two rectangular surfaces perpendicular to each other with a common edge which is 1.6 m long. The horizontal surface is 0.8 m wide and the vertical surface is 1.2 m high. The horizontal surface has an emissivity of 0.75 and is maintained at 400 K. The vertical surface is black and is maintained at 550 K. The back sides of the surfaces are insulated. The surrounding surfaces are at 290 K, and can be considered to have an emissivity of 0.85. Determine the net rate of radiation heat transfers between the two surfaces, and between the horizontal surface and the surroundings. A. 2245 W, 725 W B. 1245 W, 725 W C. 1245 W, 825 W D. 2245 W, 825 W

Equation 17.5 is listed!!

#4?

For the mechanism below the Grashof condition and Barker classification are to be determined 3.25" 60 11.25" 9.38" 4.32" e 6.0" 6.75 S + L = Choose... P+Q= Choose... Grashof condition: Choose... Barker Classification: Choose... •

A wagon weighing 5100 Kg moving at a speed of 8 km/h has to be brought to rest. Springs made of wire diameter 25mm with a Dm of 250mm and with 24 turns are available. Find the number of springs required in buffer to stop the wagon at a compression of 180mm. b)A close coiled helical spring is made of diameter wire 25mm. The spring index is 8. Findthe number of turns required and maximum allowable load if the allowable shear stress is100 MPa and elongation is limited to 40mm. [G=80 GPa

6

6. Design a cast iron protective flange coupling to connect two shafts in order to transmit 7.5 kW at 720 r.p.m. The following permissible stresses may be used : Permissible shear stress for shaft, bolt and key material = 33 MPa Permissible crushing stress for bolt and key material = 60 MPa Permissible shear stress for the cast iron 15 MPa [Ans. d = 25 mm; D = 50 mm]