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A dc shunt motor operating at an armature terminal voltage of 125 V is observed to be operating at a speed of 1180 r/min. When the motor is operated unloaded at the same armature terminal voltage but with an additional resistance of 5 O in series with the shunt field, the motor speed is observed to be 1250 r/min.
a. Calculate the resistance of the series field.
b. Calculate the motor speed which will result if the series resistance is increased from 5 O to 15 O.
Design and implement a Rectangle class. Make your class inherit from the Point class given in the lecture (notice that a rectangle can be described through the upper-left vertex, the height, and the width).
a generic rectifier is supplied from a 115v 60hz ac source and operates with a firing angel of 30 degrees. For the output voltage of the rectifier find: The dc component The rms value othe ac component
The stator resistance Rs is 0.25 Ω, and the stator as well as rotor leakage inductances are negligible. All losses except in the stator and rotor resistances can also be neglected. The reflected rotor resistance, Rr' is 0.3 Ω. The magnetizing curr..
An ND:YAG laser in the lab emits light at 1064 nm. The laser is light is directed into a slab of silicon, which has an index of refraction n = 4. a. What is the relative permittivity of Si at this wavelength (Hint: Si is non-magnetic.)
What is the magnitude of the net force which acts on the object? What is the magnitude of the net force when the object encounters 23.4 N of air resistance?
Determine the current in the inductor in the given image as a function of time after the switch S1 closes at t=0s. There is no initial current in the inductor. Also determine the inductor current at t=0.5 ms.
Develop the Boolean expression in POS form found by removing the static-zero hazards from the following expression. Your circuit must be minimized to receive full credit. Draw the schematic for the hazard-free circuit.
Design a system to convert a two digit BCD number into an8-bit binary number. For example, if the input is thirty-five inBCD format (namely 0011 0101 in BCD format), the output should bethirty-five in 8-bit format (namely 0010 0011 in binary forma..
A collector modulated transmitter has a supply voltage of 48 V and an average collector current of 600 mA. What is the input power to the transmitter. How much modulating signal power is needed to produce 100 percent modulation
You have a laundry room where the following loads are connected to a 208V circuit: 2500W electric base board heater, 600W wash machine, 3600W dryer, and a 1000W iron. All loads are connected in parallel.
Using 4 PSK or 2 PSK with the same total power as a reference, calculate the Eb/No versus Pe waterfall plot and compare the asymptotic coding gain of the coder/encoder.
Suppose a fair coin is tossed n times. Each coin toss costs 'd' dollars and the reward in obtaining 'X' heads is aX^2 + bX. Find the expected value of the net reward.
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