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Consider a separately-excited dc motor. Describe the speed variation of the motor operating unloaded under the following conditions:
a. The armature terminal voltage is varied while the field current is held constant.
b. The field current is varied while the armature terminal voltage is held constant.
c. The field winding is connected in shunt directly to the armature terminals, and the armature terminal voltage is then varied.
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) Determine a unit vector in the direction of Q at P(1, 2, 1) (b) Find the component of Q at P in the direction of PT where T is point (5, 3, -4) (c) Where is Q the same as the unit vector of \(a_{x}+11a_{y}+10a_{z}\)
Consider the router diagram in Figure 3. Consider that the packets shown are uniformly 500kB in size and that they are all stored in the input buffers of ports W, X and Y. These packets marked with the output buffer they are destined for.
Themotion of this platform results in a displacement that results in acorresponding change in the electrode separation. The movingelectrode has a diameter of 8mm. -If the capacitance of this sensor varies from 5 pF to 15 pF
You are the operator of a 15,000 V 60 Hz electrical substation. When you get to work one day you see that the station is delivering 6.0 MW of power with a power factor cosf=0.9. What is rms current.
Given an AC input voltage of Vrms = 200Vrms and a sinusoidal frequency of omega = 120pi rad/sec, determine the following: V1peak (peak value of AC input voltage) V1(peak-to-Vpeak )(peak to peak value of AC input voltage) Frequency of input voltage V..
Design a continuous time system to generate output y(t)=sin(wt)u(t) when the input is a unit step function. Specify the system using a differential equation.
Determine the rms value of the supply current. Find v(t) and i(t). Determine the power from the supply and supply power factor.
A 50HP single phase motor operates from a 480V, 60HZ supply. When delivering full rated power the motor efficiency is 89% and the power factor is 0.78 lagging. Determine the full load current.(Hint: 746W=1HP)
Design a signal conditioning circuit for a K-type thermocouple, which produces output voltage of 0V-5V using a three terminal solid-state temperature sensor for reference junction compensation. The sensitivity of the sensor is 4mV/C.
Construct a truth table for a three variable function that includes minterms 1,4,6,7. Construct the corresponding K map and use it to find a minimal SOP expression for F.
An Aluminum wire with a square cross section 2mm on a side is carrying a current of 1.5amps. Aluminum has a resistivity of 2.69*10^-6 ohm-cm and an atomic volume of 10cc/mol. Assuming aluminum has three free electrons per atom
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