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Draw a circuit diagram for the following experiment:
1. Set up the dc machine to be operated as a separately excited motor. Use a synchronous generator as the load to the dc motor. (Fig. 2.20 and Fig. 2.21 show the required connection diagram.)
2. Supply the power to the field of the dc motor from a 120 V fixed dc supply through a rheostat. Adjust the field current, by varying the rheostat, to the rated value.
3. Provide the armature current of the dc motor from a 0-120 V dc variable supply. Make sure that the variac reads zero before switching on/off the power supply.
4. Observe the motor characteristics by taking five readings between no load and 100% of rated torque. The load to the motor can be var- ied by changing the resistors connected across stator terminals of the synchronous generator and also varying its field rheostat. Make sure the armature voltage and the field current of the dc motor remain at the rated values as the load is varied. Before taking any measurement, change the resistors and the field rheostat, and observe how the torque changes. Depending upon the deflection of the pointer in the torque meter, the polarity of the field connection of the dc motor may have to be reversed. Record speed, armature current, armature voltage, and torque. Do not increase the armature current higher than the rated value. Take one measurement at rated Ia and calculate the efficiency of the motor.
A coaxial cable contains material with a dielectric of 9. The diameter of the inner conductor is 2 mm and the diameter of the outer conductor is 12 mm. Determine the velocity of propagation in m/s.
a) Write the real-time expressions in the z=0 plane. What kind of polarization exists here Is is clockwise or counterclockwise (looking along +z) b) Find the expression for the accompanying H(z) field.
a. if the input r(t)=5u(t), ie. R(s)=5/s, find the steady-state of C(t), b. Approximately how many seconds are required for the system to reach steady state note you two time constants to consider, and c. Do you expect the transient response to be o..
frequency 6GHz propagating in vacuum is comprised of two components which are in spatial and temporal quadrature. The phasor expression of the wave electric field is given to be. obtain the phasor expression for the wave magnetic field.
Assume we have an N-bus power system and we know the N x N zero-sequence, positive-sequence, and negative sequence matrices for the system. Write a MATLAB program to find the system bus voltages during a (a) 3-phase balanced short circuit fault at..
In an amplifier circuit, why do we need to bias the MOSFET atan operating point What would happen if the signal peak amplitudewas smaller than 1 V, the transistor had Vto=1 V and we biased the transistor at Vgsq=0
How to write and application note that explains the use of AA sized rechatgeable batteries as a replacement for non-rechargeable alkaline barreries in a digital camera
GaAs LED emitting surface size is 180 um by 180 um. The doping levels are NA = 9 E+15 cm-3 and ND = 5 E+17 cm-3. The n-layer is 70 um thick, and the p-layer is 8 um thick.
A large reel of paper installed at the end of a paper machine. d1 = 2m, J = 1000kgm^2, n1 = 60rpm, Tension on Paper = 1000N. Calculate: a. Motor power when the reel turns at 60rpm. b. Torque to increase speed to 120 rpm in 10 seconds
A solid spherical conductor of radius a is surrounded by a concentric spherical conducting shell of inner radius b and outer radius c. The region between the conductors, a
Consider the following 2-input (x1,x2) single-output (z) asynchronous circuit: The output changes from 0 to 1 only when x2 changes from 0 to 1 while x1 = 1. The output changes from 1 to 0 only when x1 changes from 1 to 0 while x2=1.
For what range of values of a is the system stable?
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