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The armature, frame, and core of a 12-V DC control relay are made of sheet steel. The average length of the magnetic circuit is 12 cm when the relay is energized, and the average cross section of the magnetic circuit is 0.60 cm2. The coil is wound with 250 turns and carries 50 mA. Determinea. The flux Density β in the magnetic circuit of the relay when the coil is energized.b. The force F exerted on the armature to close it when the coil is energized.
Bipolar Junction Transistor, A silicon n-p-n bipolar junction transistor is designed with emitter, base and collector doping levels of 10^19cm, 10^15cm and 5*10^17cm, respectively.
An FM signal being transmitted is represented by eFM(t) = 50Sin((2)(95.1)(106)t+2Sin((2)(10)(103)t)). If the antenna impedance is 75 , determine: (a) total power in FM signal and (b) FM modulation index.
a. Using the superposition theorem, determine the current through the 12 ohms resistor. b. Convert both voltage sources to current sources and recalculate the current to the 12 ohms. c. How do the results of parts (a) and (b) compare
A three-phase 5 hp, 208 V motor has an efficiency of 92%, and a power factor of 0.87 (lagging) when it runs at full power. Calculate the motor phase currents and line currents if the motor is wye connected, and delta connected.
A system is needed to measure flow, which continuously cycles between 20 and 30 gal/min with a period of 30 sec. The required output is a voltage varying from -2.5 to +2.5 V for the cycling flow range. The sensor to be used has a transfer function..
three balanced Y-connected loads are installed on a balance three phase four-wire system load 1 draws a total power of 6kw at unity P.F load 2 requires 10 KVA at P.F=0.96 lagging load 3 needs 8kw at 0.85 lagging if the phase voltage is 135V
Then find the phase relation between the total voltage and current; is it leading or lagging when the frequency is below resonance and above resonance; what is the nature of the circuit in those two regions(capacitive or inductive).
Given a three phase motor: 5 hp, 3515 rpm, 230V, 10A, efficiency = 75%; derive the per-pharse equivalent circuit of the motor.
A new type of Schottky diode is optimized for low-voltage applications. It has typical forward voltage drop of 0.2 V, but its leakage current can be as high as 80 mA. It is being considered for a 12 V to 2.5 V converter with 50 W load.
(i) an antenna connector and feedline with an attenuation of 1.5dB; a low-noise amplifier with a noise figure of 4 dB and a gain of 10 dB, and a unit gain mixer with a noise figure of 1 dB. What is the noise figure of the receiver
determine the frequency response and the magnitude response of the z tranfer function below. please show step to step how to get the result. D is a positive interger
When working out the power dissipated you have the equationusing the same current (io) but this time you use anegative sign in the equation. How do you know when to use a positive or negative sign for this current in both situations
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