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- The turning moment diagram for a multi cylinder engine has been drawn toa scale of 1 mm = 4500 N -m vertically and 1 mm = 2. 4 ͦ horizontally. Theintercepted areas between output torque curve and mean resistance lineabove and below the mean taken in order from one end are 342, 23, 245,303, 115, 232, 227, 164 ??2, when the engine is running at 150 rpm. Ifthe mass of the flywheel is 1000 kg and the total fluctuation of speed doesnot exceed 3% of the mean speed, find the minimum value of the radius ofgyration.A selfpropelled truck of total mass 25 tonnes and wheel diameter 750 mm runs on a track forwhich the resistance is 180 N per tonne. The engine develops 60 kW at its maximum speed of 2400r.p.m. and drives the axle through a gear box. Determine : 1. the time to reach full speed from reston the level if the gear reduction ratio is 10 to 1 Assume the engine torque to be constant and agearing efficiency of 94 per cent, and 2. the gear ratio required to give an acceleration of 0.15 m/s2on an up gradient of 1 in 70 assuming a gearing efficiency of 90 per cent.= 1 ective diameter of 75 i clutch have an effe S i, e 10.34, The contact surfaces in a cone requing s - S ind the torque The semi-angle of the cone is 15°, The coefficient of. s Pee : produce slipping of the clutch if an axial force applied is 180 N. . . orn, This cluch is employed o connect an electric motor running “mf”r:f o /‘.’K'W:‘ tha Jopwleel which s iniially stationary: The lywheel ha a mass of o e sricres o 150 mm. Calculate the time required for the flywheel to attain full speed and als 8 lostin the slipping of the clutch,
- Q2 ) A cone clutch is to transmit 10 KW at 600 r.p.m. the cone has aface angle of 10◦The width of the face is halfe of the mean radius and the max pressureis 0.1 N/mm²Assuming uniform wear and the coefficient of friction is 0.3, find theinner and outer radius and the axial force required on the clutch.2.5-L bench scale bioreactor is used for the production of recombinant P64K protein from Neisseria meningitides. The dimensions for the bioreactor are Dt 12.9 cm, ratio Di/Dt = 1/3 and N = 700 rpm. With the scale up factor of 2.24, determine the impeller tip speed (m/s) for the pilot scale bioreactor based on constant impeller tip speed and constant power consumption per volume. Predict which scale up method might give a higher concentration of P64K, if the demand of dissolved oxygen plays an important role.;: . L The contact surfaces in a cone clutch have an ej'fective diameter of 7‘5 i semi-angle of the cone is 15°. The coefficient of friction is 0.3. Find the torque requiy, 5 e slipping of the clutch if an axial force applied is 180 N. This clutch is employed to connect an electric motor running um_'form!y at 1 000 Epm. with, el which is initially stationary. The flywheel has a mass of 13.5 kg and its radius of gyriy, is Calculate the time required for the flywheel to attain full speed and also the energy [y, in of the clutch.
- A motor vehicle of mass 1000 kg has road wheels of 600 mm rolling diameter. The total moment ofinertia of all four road wheels together with the half shafts is 10 kgm2, while that of the engine andclutch is 1 kg-m2. The engine torque is 150 N-m, the transmission efficiency is 90 per cent and thetractive resistance is constant at 500 N. Determine 1. Gear ratio between the engine and the roadwheels to give maximum acceleration on an upgrade of 1 in 20, and 2. The value of this maximumacceleration.Determine the size of the clutch plate suitable for an Ambassador car employing asingle plate type friction clutch and developing 37.5 kW at 4282 rpm. The insidediameter of the clutch plate is 0.6 times its outside diameter and it is to be ensured thateven after a loss of 30% of the engine torque due to wear of the clutch facing, the clutchdoesn’t slip. The intensity of the pressure on the facing is not to exceed 70 kPa. Assumeµ = 0.3.der engine has been drawn 0 2 moment diagram for a multicylin ~ 2.4° horizontallv. e = 4500 N-m vertically and 1 mm 'mxemapwd areas between output torque curve and the mean resistance line taken in order from one end are 342. 23, 245. 303. 115. 232. 227. 164 mm2. when the engine is running at 150 r.p.-m- If the mass of the flywheel is 1000 kg and the tota! fluctuation of speed does not exceed 3% of the mean speed. find the minimum value of the radius of gyration 16.4/ The turning
- A cone clutch is to transmit 7.5 kW at 900 rpm. The cone has a face angle of 12o. The width of the face ishalf of the mean radius and the normal pressure between the contact faces is not exceeding0.09Nmm2⁄. Assuming uniform wear and the coefficient friction between contact faces as 0.2. Find themain dimensions of the clutch and the axial force required to engage the clutch.A flat belt, of density 1000 kg/m3 has a maximum permissible stress of 2·5 MN/m². Thebelt is 200 mm wide and 12 mm thick.(a) Determine the maximum power that can be transmitted if the ratio of tight-side toslack-side tension is 2. The diameter of the driving pulley is 900 mm and the required speed of the output shaft is955 rev/min(b) Taking the belt thickness into account, determine the required diameter of theoutput pulley. (c) What would the required diameter be, assuming a total slip of 4%? (d) If the mass of the belt was neglected, explain the effect (with reasons) this wouldhave on the maximum power calculated in (a).A steam engine develops power at mean torque of 18,000 N-m and velocity of 9 m/s. The mean diameter of the flywheel rim is 1.3 meters. The coefficient of fluctuation of speed is 0.03 and the coefficient of fluctuation of energy is 0.21. Determine the thickness of the rim in mm if the width of the rim is twice of its thickness. Assume density of rim material as 7250 kg/m3.