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A 200V dc motor is loaded by a constant torque of 10 NM. The armature resistance of the motor is 2Ω, and the field constant Kφ=2.5V s. Calculate the motor speed.
an 8 pole synchronous motor produces a full load torque of 25 foot pounds, fed from a 60hz source and is now operating at 60% eff. What is the energy cost if the motor ran for a 8000 hrs/yr and the electrical energy cost were $.09/kWh.
Using a 1 mA current source, the designer wishes to create a reference voltage of 1.25 V. Suggest a combination of series and parallel diodes that will do the job as well as possible. How many diodes are needed. What voltage is actually achieved.
An electric flux density is given by D = D0 a, where D0 is a given constant. (a) What charge density generates this field (b) For the specified field, what total charge is contained within a cylinder of radius a and height b
Consider two parallel cylindrical conductors with radius aseparated by distance 2d. Calculate the capacitance per unit lengthbetween the two. You may assume that the distance d is much greaterthan the wire radius a.
How much resistance is required to limit the current to 3 mAif the potential drop across the resistor is 12V
Assume the resistance of a human person was 500 ohms, if a person was struck by lightning with a peak voltage of 100,000 volts, what was the peak current that would flow through the person
Considera causal LTI system. When the input to the system is u(t-5) the unilateral Laplace transform of the output is Y(s)=(e^-6s -e^-9s)/s^2 Determine and sketch the output of the system when the input is x(t) shown below:
1) in a swamped common-emiter BJT amplifier, as shown below, if Vcc =12 V, R1 =8.2 kohm, R2=10 kohm, Rc = 500 ohm, Re= 1 kohm, Vbe = 0.7 V, and B =100, what is the transistor`s emitter current
If we know only the following about a negative feedback system: Gain 12dB, phase 180° at 1rad/sec and gain 0dB, phase 159° at 0.2rad/sec. Determine if system is stable or not.
Find the coefficients of reflection for fresh water (with relative permittivity equal to 81) of a vertically polarized wave that hits the water surface at an incident angle of 60o.
Consider the circuit shown in Figure. Write the differential equation for v(t). Find the damping coefficient, the natural frequency, and the form of the complementary solution.
(a)compute the magnitude response H(w), and phase response of the filter. (b) determine the input-output relation(difference equation) of the filter in the time domain. (c) compute the output of the system if the input is x(n)=2cos(πn/6 +45o) -∞
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