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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?
A temperature sensor has a static transfer function of 0.15mV/degrees C and a time constant of 3.3 s. If a step change of 22 degress C to 50 degress C is applied at t = 0, find the output voltages at 0.5s, 2.0s, 3.3 s, and 9s.
a DC series machine ( 9.25 kW, 185 V, 1500 RPM) has Ra+Rsr = .3 ohms. The data for the magnetization curve are: Ia 0 10 20 30 40 50 60 Ea 10 50 106 156 184 200 208 Determine the terminal voltage at Ia = 20 amps, 40 amps and 60 amps.
Design a simple OP AMP circuit that has a variable gain from -100 to -5000.- Using only one OP AMP, design a circuit that realizes the following equation: vO = 5v1 -3:3 V.
Draw a relay construction diagram and briefly explain the operation of a relay.
A half-wave rectifier circuit with a 1-Kwload operates from a 12-v(rms) 60-Hz household a 5-to 1 transformer having a center-tappedsecondary winding. It use two silicon diodes that can be modeled tohave a 0.7-v drop for all currents.
Determine the capacitance required to establish a capacitive reactance that will match that of a 2-mH coil at a frequency of 50 kHz.
A certain parallel-plate capacitor has plate length of 2 cm and width of 3 cm. The dielectric has a thickness of 0.1mm and a relative dielectric constant of 80. Determine the capacitance.
8 bit DAC with a 5 volt reference connects to a light source with an intensity given by Il=45V^(3/2)W/m^2 a. what is the range of intensity that can be produced b. what intensities are produced by digital inputs of 1bh, 7ah,9fh,e5h
A modulating signal consists of two sinusoidal components: 1 kHz and 3 kHz. The transmitter carrier frequency is 80 kHz. If the signal is applied to a SSB-LSB transmitter, indicate the output frequencies in kHz.
the capacitance varies depends on the distance of the two plates from 0 to about 20in. this model is needed to generate an input to an other part of the circuit to simulate it and obtain the output in PSPICE.
Using a 1-mA, 100-Ω d'Arsonval movement, design a multirange voltmeter having scales of 5 V, 50 V, and 500 V.- Show the circuit and component values.
Given an IP packet used for voice transport. Assume G.711 or G.726 coders. How many bytes (octets) can we expect in the payload?
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