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Design of Machine Elements Questions

  Derive the expression for the ratio of Tensions in belt drive without considering the effect of centrifugal tension
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Derive petroffs equation for a lightly loaded bearing
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Under what circumstances the Bevel gears are used? Give a detailed classification of Bevel gears.
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Design a valve spring for an automobile engine, when the valve is closed, the spring produces a force of 45N and when it opens, produces a force fo 55N.The spring must fit over the valve bush which has an outside diameter of 20mm and must go inside a space of 35mm. The lift of the valve is 6mm. The spring index is 12. The allowable stress may be taken as 330MPa and modulus of rigidity, G 80GPa
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Defoine formative number of teeth, as applied to Helical gears and explain its importance in the design of Helical gears.
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Derive the expression for hte stress induced in helical coil spring
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Design a shrink fit joint to join two cylinders of diameter 150mm*200mm and 200mm*250mm. Maximum tangential stress in the components due to shrink fitting is to be limited to 40MPa. Also determine the axial force necessary to dis-engage the joint if the length of the joint is 200mm and the maximum power that can be transmitted at a rated speed of 1000 rpm. The cylinder material has a modulus of elasticity 210 GPa and Poissons ratio 0.3
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  What are the assumptions made in finding stress distribution for a curved flexural member? Also state two major differences between a straight beam and a curved beam
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Derive petroffs equation, with usual notations
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  A single plate friction clutch of both sides effective has 0.3m outer diameter and 0.16 m inside diameter. The co-efficient of friction is 0.2 and it runs at 1000 rpm. Find the power transmitted for uniform wear and uniform pressure distribution cases if the allowable maximum pressure is 0.08MPa
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Design a pair of spur gears to transmit 20KW from a shft rotating at 1000 rpm to a parallel shaft which is to rotate at 310 rpm. Assume number of teeth on pinion 31 and 20 degree full depth tooth form
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  A two teeth right hand worm transmits 2KW at 1500 rpm to a 36 teeth wheel. The module of the wheel is 5mm and the pitch diameter of the worm is 60mm. The pressure angel is 14.5 degree. The co-efficient of friction is found to be 0.06. (1) Find the centre distance, the lead and the lead angle. (2) Determine the forces
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  A pair of bevel gears transmitting 7.5 KW at 300 rpm of pinion. The pressure angle is 20 degree. The pitch diameters of pinion and gear at their large ends are 150mm and 200mm respectively. The face width of the gears is 40mm. Determine the components of the resultant gear tooth force and draw free body diagram of forces acting on the pinion and the gear.
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  A cast iron cylinder of internal diameter 200mm and thickness 50mm is subjected to a pressure of 5N/mm(square). calculate the tangential and radial stesses at the inner, middle and outer surface
(class: BE/BTech - Common Subjects )    Design of Machine Elements

  Determine the maximum stress induced in a ring cross section of 50mm diameter rod subjected to a compressive load of 20KN. The mean diameter of the ring is 100mm
(class: BE/BTech - Common Subjects )    Design of Machine Elements

    

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