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Anonymous

Asked: 2 months agoIn: Mechanical Engineering

Prove that the ratio of belt tension is given by the T1/T2 = e^μθ

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

The mechanism, as shown in Fig., has the dimensions of various links as follows: AB = DE = 150 mm; BC = CD = 450 mm; EF = 375 mm. The crank AB makes an angle of 45° with the horizontal and rotates about A in the clockwise direction at a uniform speed of 120 r.p.m. The lever DC oscillates about the fixed point D, which is connected to AB by the coupler BC. The block F moves in the horizontal guides, being driven by the link EF. Determine: 1. velocity of the block F, 2. angular velocity of DC, and 3. rubbing speed at the pin C which is 50 mm in diameter.

The mechanism, as shown in Fig., has the dimensions of various links as follows: AB = DE = 150 mm; BC = CD = 450 mm; EF = 375 mm. The crank AB makes an angle of 45° ...Read more

Mazurek GravityPundit

Asked: 2 months agoIn: Mechanical Engineering

Design a rocker arm for the exhaust valve of a four-stroke engine using the following data: Effective length of each arm = 180 mmAngle between two arms = 135°Diameter of valve head = 75 mmLift of valve = 25 mmMass of valve = 0.5 kgEngine speed = 600 rpmBack pressure when the exhaust valve opens =0.4 MPaMaximum suction pressure = 0.02 MPa belowatmosphereThe valve opens 33° before the outer deadcentre and closes 1º after the inner dead centre. Themotion of the valve is SHM without dwell in the fullyopened condition. Assume suitable data and state theassumptions you make.

Design a rocker arm for the exhaust valve of a four-stroke engine using the following data: Effective length of each arm = 180 mmAngle between two arms = 135°Diameter of valve head = 75 mmLift of valve = 25 ...Read more

Mazurek GravityPundit

Asked: 2 months agoIn: Mechanical Engineering

A hydraulic press exerts a total load of 3.5 MN. This load is carried by two steel rods, supporting the upper head of the press. If the safe stress is 85 MPa and E = 210 kN/mm2, find : 1. diameter of the rods, and 2. extension in each rod in a length of 2.5 m

A hydraulic press exerts a total load of 3.5 MN. This load is carried by two steel rods, supporting the upper head of the press. If the safe stress is 85 MPa and E = 210 kN/mm2, find ...Read more

Mazurek GravityPundit

Asked: 2 months agoIn: Mechanical Engineering

The piston rod of a steam engine is 50 mm in diameter and 600 mm long. The diameter of the piston is 400 mm and the maximum steam pressure is 0.9 N/mm2. Find the compres- sion of the piston rod if the Young’s modulus for the material of the piston rod is 210 kN/mm2.

The piston rod of a steam engine is 50 mm in diameter and 600 mm long. The diameter of the piston is 400 mm and the maximum steam pressure is 0.9 N/mm2. Find the compres- sion of the ...Read more

Mazurek GravityPundit

Asked: 2 months agoIn: Mechanical Engineering

The following data is given forthe cap and bolts of the big end of connecting rod: Engine speed = 1800 rpm Length of connecting rod = 350 mm Length of stroke = 175 mm Mass of reciprocating parts = 2.5 kg Length of crank pin = 76 mm Diameter of crank pin = 58 mm Thickness of bearing bush = 3 mm Permissible tensile stress for bolts = 60 N/mm2 Permissible bending stress for cap = 80 N/mm2. Calculate the nominal diameter of bolts and thickness of cap for the big end.

The following data is given forthe cap and bolts of the big end of connecting rod: Engine speed = 1800 rpm Length of connecting rod = 350 mm Length of stroke = 175 mm Mass of reciprocating parts ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

A differential band brake is shown in Figure. The diameter of the drum is 800 mm. The coefficient of friction between the band and the drum is 0.3 and the angle of embrace is 240°. When a force of 600 N is applied at the free end of the lever, find for the clockwise rotation: a) The maximum and minimum forces in the band b) The torque which can be applied by the brake

A differential band brake is shown in Figure. The diameter of the drum is 800 mm. The coefficient of friction between the band and the drum is 0.3 and the angle of embrace is 240°. When a force ...Read more