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An important measure of the performance of a machine is the mean time between failures (MTBF). A certain printer attached to a word processor was observed for a period of time during which 10 failures were observed. The times between failures averaged 98 working hours, with a standard deviation of 6 hours. A modified version of this printer was observed for eight failures, with the times between failures averaging 94 working hours, with a standard deviation of 8 hours. Can we say, at the 1% significance level, that the modified version of the printer has a smaller MTBF? What assumptions are made in this test? Do you think the assumptions are reasonable for the situation?
use suitable diagram to explain the basic of a utlrasonic doppler flowrmeter . - Quote all the necessary equations.
Draw the circuit diagram of a first-order RC lowpass filter and give the expression for the half-power frequency in terms of the circuit components. Sketch the magnitude and phase of the transfer function versus frequency.
Hall-effect devices such as gear-tooth sensors and switches are commonly used in automobiles because they are rugged, reliable, operate under sever conditions and are inexpensive
Design a passive low-filter using resistors and a 100uF capacitor that will have a passband gain of 0.8 and a cutoff frequency of10000 HZ.
A charge Q is uniformly distributed over the wall of a circular tube of radius b and height h. Determine V and E on its axis at a point outside the box.
A 2722-kg weight is being pushed up an inclined surface at constant speed by a cylinder. The coefficient of friction between the weight and inclined surface equals 0.15. for a pressure of 6.9 MPa, determine the required cylinder diameter.
In order to control the slope of a ramp produced by an integrator, the values of Vin, R, and C may be varied. Assuming a fixed value for C of 10 μF, would it be better to have a relative large Vin with a correspondingly large value of R
Sketch the Bode plot (including the magnitude response and phase response) of a continuous- time LTI (Linear Time-Invariant) system described by the following transfer function: \(H(s) = 5(s + 2)/s^{2}(s + 10)\)
A long cable with cylindrical cross-section has inner conductor of radius a and an outer conductor of inner radius b and outer radius c. The dielectric constant of the material between the conductors is 3.
A 25KVA transformer supplies a load with the following schedule: 8hrs-full load with 0.8 lagging power factor. 4hrs-75% full load at unity power factor. 12hrs-No load. The transformer is energised 24hrs per day and has iron losses of350w.
in this project we will consider the control of a synchronous generator supplying electricity to the grid. we will
problem 1using nodal analysis solve for the current la -9 mab mac -12 mad 0 ma 0012 maproblem 2the supemode used to
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