speed of the pulley in rpm and the power transmitted if the condition of maximum power prevail?
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- Q2/A pulley used to transmit power by means of ropes has a diameter of 3.6 metres and has 15 grooves of 45° angle. The angle of contact is 170° and the coefficient of friction between the ropes and the groove sides is 0.28. The maximum possible tension in the ropes is 960 N and the mass of the rope is 1.5 kg per metre length. What is the speed of pulley in r.p.m. and the power transmitted if the condition of maximum power prevail ?Two parallel shafts 5 m apart are connected by open flat belt drive. The diameter of the bigger pulley is 1.5 m and that of the smaller pulley 0.75 m. The initial tension in the belt is 2.5 kN. The mass of the belt is 1.25 kg/m length and coefficient of friction is 0.25. Taking centrifugal tension into account, find the power transmitted, when the smaller pulley rotates at 450 rpmQ2 A flat belt type is used for a belt drive system connecting two pulleys 1.2m apart. The driver pulley with diameter 40 cm is rotating with the speed 350 rpm, while diameter of driven pulley is 100 cm. Coefficient of friction of the contact surface between belt and pulley is 0.3. Maximum allowable tension is 600N. (i) Find the power transmitted by the belt, P. (ii) Determine the Initial tension of the belt, TA. (iii) If the flat belt is now replaced by a Vee-belt with groove angle of B = 30°, find the power transmitted by this belt. Give explanation why power transmitted by flat and Vee-belt type are not the same. Explain your answer according to basic friction concept.
- A flat belt type is used for a belt drive system connecting two pulleys 1.2m apart. The driver pulley with diameter 40 cm is rotating with the speed 350 rpm, while diameter of driven pulley is 100 cm. Coefficient of friction of the contact surface between belt and pulley is 0.3.Maximum allowable tension is 600N. (i) Find the power transmitted by the belt, P. (ii) Determine the Initial tension of the belt, TA. iii) If the flat belt is now replaced by a Vee-belt with groove angle of B = 300 , find the power transmitted by this belt. Give explanation why power transmitted by flat andVee-belt type are not the same. Explain your answer according to basic friction concept. iv) If a Vee-belt with groove angle of B = 900 is being used, find the power transmittedby this belt. Discuss your findings by comparing with answer in (i) and answer in (iii) above. (v) List and explain TWO (2) practical applications each for flat belt and Vee-belt driveFind the power transmitted by a belt running over a pulley of 600 mm diameter at 200 r.p.m. The coefficient of friction between the belt and the pulley is 0.25, angle of lap 160° and maximum tension in the belt is 2500 N.Two parallel shafts whose centre lines are 4 m apart, are connected by an open belt drive. The diameter of the larger pulley is 1.8 m and that of smaller pulley 3 m. The initial tension in the belt when stationary is 3 kN. The coefficient of friction between the belt and the pulley is 0.3. Calculate the power transmitted, when the smaller pulley rotates at 550 r.p.m. and length of the belt.
- The controlling force curve of a spring controlled governor is a straight line. The weight of each governor ball is 40 N and extreme radii of rotation are 10 cm and 17.5 cm. If the values of the controlling force at above radli are 205 N and 400 N respectively and friction of mechanism is equivalent to 2.5 N at each ball. Find The extreme equilibrium speeds of the governor. (1) The equilibrium speed and coefficienct of insensitiveness at a radius of 15 cmFind the power transmitted by a belt running over a pulley of 600 mm diameter at200 r.p.m. The coefficient of friction between the belt and the pulley is 0.25,angle of lap 160° and maximum tension in the belt is 2500 N.a heavy machine is being lifted from the ground up a building using a set of pulleys with rope. the end of the rope moves at 5m/sec and the machine rises at 1 m/sec. the end of the rope is attached to a hoist mounted at the ground.
- Two pulleys, one 425mm diameter and the other 210mm diameter are one parallel shaft 2m apart and are connected by a crossed flat belt. Find the length of the belt required and the angle of conduct between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 200 rev/min, if the maximum permissible tension in the belt is 1 kN, and the coefficient of friction between the belt and pulley is 0.3?3. A V-belt drives a pulley at a speed of 1440 m/min. The coefficient of friction between belt and pulley is 0.3, semi V-groove angle is 22.5° and angle of contact of belt with the pulley is 160°. If the mass of the belt is 0.45 kg/m and if permissible pull in the belt is 800 N. Calculate the power. Consider the centrifugal tension in the belt.A body of 3kg moving in the frictionless xy plane started its motion from the center of the coordinate system with a velocity of Vilk=(2î+j)m/s. The object is oriented to the point given by rson=(10î+j)m by the effect of forces F1=(2î+7j)N and F2=(2î-5j)N. A) Find the work done by F1 and F2 forces. B) What is the velocity when the object reaches its rend position?(g=9.8m/s^2)