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The triggering device for an automobile airbag restraint is required to have a reliabil-ity of 95 per cent when tested on an impact test rig. This reliability is to be established at 90 per cent confidence. The test is destructive. For a series of tests on a specific design, failures occurred on the 11th, 43rd, 49th, 75th, 102nd and 144th samples. All other samples passed. The 160th sample has just been tested.
(a) Plot the results on suitable binomial plotting paper (Chartwell 5703, or suitable TEAM paper, as described in the text) and estimate the current reliability and its 90 per cent lower confidence limit. Hence decide if the test requirements have been met. If not, estimate the amount of further testing required if there is no improvement to the device.
(b) Consider whether doing the further testing indicated in (a) is sensible.
Consider an n-Si with doping of 9*10^16cm^-3. In a certain region of this sample, there is an electric field of 1000V/cm. Estimate the electron and hole drift velocity and the total drift current density in that region.
Suddenly there is a short-circuit on the electric grid, and the electrical output goes to zero for 2 seconds. Calculate the increase in speed in rpm during this interval. Assume that the shaft-torque remains constant
a defibrillator supplies a maximum energy dosage of 20 jouls, and the maximum voltage of 8 volt. suppose it is desired to charge the capacitor from an ideal DC current source, and they want to do it in less than 80 seconds.
Draw the state diagram for a sequence that detects the sequence 0101 using a minimal number of states. The detector should also detect overlapping sequences. Design the circuit using D flip-flops. Draw the logic diagram.
mesh analysis involves writing and solving a number of simultaneous equations. The number of equations is equal to the number of independent loops in the circuit. Each equation is derived from the application of KVL around the loop.
A temperature sensor is specified to provide 2 mV/°C. When connected to a load resistance of 10 k ohm, the output voltage was measured to change by 10 mV, corresponding to a change in temperature of 10°C.
A delta-wye connected three-phase transformer is rated at 38 MVA with primary and secondary line voltage ratings of 345 and 125 kV, respectively. The transformer p.u. reactance is 10%, the p.u. no-load current is 0.1.
What is the resolution of an ADC with a word length of 12-bits and an analogue signal input range of 100 V A sensor produces a maximum analogue output of 5V. What word length is required for an ADC if there is to be a resolution of 10mV
A uniform plane electromagnetic wave propagates in a lossless dielectric medium. The electric field in the wave has the instantaneous expression E(z,t) = iy 3 sin(3pi.109t + 100piz 600), V/m. i) What is the frequency of the wave in Hz
A penstock is used to bring water from behind a dam into a turbine. the effective head is 20 m and the flow rate of water is 50m^3/s. Compute the power of the water exiting the penstock.
Compare the differences in the FFT result. Explain why even though the inputs to both FFTs are the same cosine waves, the shapes of the FFTs are different. Calculate, plot and compare the results of the 512-point FFT of the above signal.
With the multi function gate: F = X'AB + YA'B + X'AB + YAB' 1. Can this gate be used as an inverter If yes, how 2. Will the change in the number of inputs or outputs affect the number of operation select lines Explain.
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