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A stepper motor is being used as a crane motor in an expensive toy. The motor has the following properties: Holding torque = 35 in. · oz, dynamic torque = 20 in. · oz, and detent torque = 5 in. · oz. The motor turns a 1.5-in. diameter pulley around which a string is wound. How much weight can the crane lift? How much weight can the crane continue to support with the power on; with the power off?
One reason that the maximum electric field is important is because of the possibility of impact ionization, which may be desired or undesired in a particular application. The process of impact ionization is dependent on the electric field
What maximum 60-Hz rms primary voltage is possible without reaching this saturation level? What is the corresponding secondary voltage? How are these values modified if the applied frequency is lowered to 50 Hz?
a) The input signal to an amplifier is -20 dBm. What is the input signal power in mW. Given the input signal and noise power in parts (a) and (b), what is the input signal-to-noise ratio in dB.
A three-phase, 2300-V, 60-Hz, cylindrical-rotor synchronous motor has a synchronous reactance of 10 ohms per phase and negligible armature resistance. The motor delivers 250 hp at a power angle of 20 electrical degrees, and the efficiency is 90%
A system is described by the differential equation ty'(t)-8y(t)=x(t). Classify the system as to linearity, time-invariance and stability. Show that a system with exicitation x(t) and response y(t) described by y(t)=u(x(t)) is nonlinear, time invari..
A current of 4 A rms flows when a neon sign is supplied by a 110-V rms power system. The current lags the voltage by 60°. Find the power dissipated by the circuit and the power factor.
Each equation above describes a field that is distributed sinusoidally and whose amplitude varies sinusoidally with time (a pulsating field). Prove for the resultant magnetic flux density in the air gap (a) at any given t
Given a sinusoid v1(t) whose phasor isV1 = -3 + j4 V, use phasor phasor method to find the voltage v2(t) that leadsv1(t) by 90 degrees and has an amplitude of 10V.
Discounted payback: Roswell Energy Company is installing new equipment at a cost of $10 million. Expected cash flows from this project over the next five years will be $1,045,000, $2,550,000, $4,125,000, $6,326,750, and $7,000,000. The company's disc..
Consider a magnetic dipole carrying a current I. a. Calculate the magnetic flux density B at a point P specified in spherical coordinates. Express the answer in terms of the magnetic dipole moment m. Justify all the assumptions adopted.
Convert the first-order Butterworth low-pass prototype, H(z) = 1 / s+1 to a digital IIR filter using impulse invariant method when sampling frequency is 1 Hz.
Calculate the frequency and line voltage of a delta-connected generator with the following characteristics:
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