Mechanical Engineering Answers

A 800 kg machine is mounted on four identical springs of total spring constant k = 1.5 x 106 N/m and negligible damping. The machine is subjected to a harmonic external force of amplitude Fo = 490 N and frequency of 180 rpm. The amplitude of the motion of the machine

two points b and c lie on radial line of a rotating disk. the points are 2 inches apart. vb=700 ft/min and vc=880 ft/min. find the radius of rotation for each of these points. slader

A particle moves in a straight line such that the velocity is 5 + 3cosX. Given that the displacement is zero when the time is zero , find an expression of time as a function of the displacement

A tachometer generator used to measure speed of rotation of IC engine, has an ideal rating of 6 V per 1000 rpm, a range of 0-4000 rpm and accuracy of ± 0.4 % of full scale. If the output of tachometer generator id 18 V, what is the ideal value of the speed? What are the minimum & maximum values of speed.

A reactor wall, 320mm thick is made up of an inner layer of fire brick (k = 0.84 W /m 0C) covered with a layer of insulation (k = 0.16 W /m 0C ). The reactor operates at a temperature of 1325 0C and the ambient temperature is 25 0C, .
i). Determine the thickness of fire brick and insulation which gives minimum heat loss;
ii) calculate the heat loss;
presuming that the insulating material has a maximum temperature of 12000C.

•Discuss the concept of critical radius of insulation for a cylindrical object and explain why no such similar phenomenon occurs for plane walls.​​

10 kg of water is placed in an enclosed volume of 3m³.Heat is added until the temperature is 250°C.For the final state; A) the pressure is? B) the mass of vapour is? C) the enthalpy of the vapour is?

AN ENGINE RUNNING AT 5000rpm produces a power output of 210kw.the mean radius of clutch is 15cm .if the coeficient of friction between surfaces is 0.35 and a clamping force of 20kn,calculate the torque transmitted by the clutch

The Whitworth quick return motion mechanism has the driving crank AC=150 mm long.
The distance between fixed centres CD= 100 mm. The line of stroke of the ram passes
through the centre of rotation of the slotted lever whose free end is connected to the
ram by a connecting link. Find the ratio of time of cutting to time of return.