Automotive manufacturer is testing the ignition system for the number of on/off switches. seven ignition devices were tested to failure with the following results: 10522, 14 232, 17 811, 21 762, 29 830, 39411 and 43 901 switches. using the software or weibull probability paper determine a)-the parameters of 2-parameter weibull distribution. b)-2-sided 90 % confidence on reliability of the system at 10 000 switches.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.