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A starter motor in a car has an armature 20cm long, diameter 10 cm, and slots .5 cm deep filled with windings. The radial field is provided by the coils in the stator to obtain a flux density of .2 Wb/m^2 so that there is one south and on the opposite side, the north pole. The coils on the rotor, 10 turns per coil, are connected in series through the commutator so that at any instant of time there are 5 coil sides under each pole. What is the torque on the rotor when 1 A flows through the coils? If this were an alternator rotating at 1000 rpm, what is the dc voltage from a full wave rectifier?
The R2= 6 homs load in the circuit is absorbing four times as much average power as the R1 = 20 ohmsohms load. The two loads are matched to the sinusoidal source that has an internal impedance of 500 (angle) 0 1)What is the numerical value of a1
An office building of 20,000 ft2 would then take 40,000 watts of lighting at 2 watts /ft2. which amounted to 667 - 60 watt light bulbs or about the same two-bulb fluorescent fixtures. Resize the lighting system (W) assuming a lighting level.
The 24-bit data field of a packet is given by 0xBC603F. The packet contains a CRC with the generator polynomial given by X 3+X+1 a) Find the CRC checksum. Provide the complete code-word including the checksum in hex.
A single-phase, half-wave SCR circuit is used to control the power consumption of an inductive load. The resistive component of the load is 5 Ohm. The source voltage is 120 V (rms). When the triggering angle is adjusted to 60 degrees
Design a multi-stage audio amplifier for delivering an average power of 400 mW to a 16 Ohm speaker from a microphone that produces a 10 mV peak sinusoidal signal and has a source resistance of 1 kW. Use standard NPN QN2222 for your design.
(1) If you have a transformer that is not in a circuit, how can you tell/determine what the ratio is (2) How do you tell if a diode is forward or bias. How much voltage is assumed dropped across a forward biased silicon diode.
Design a 7.5-V zener regulator circuit using a 7.5-V zener specified at 12mA. The zener has an incremental resistance r(z) = 30 ohms and a knee current of 0.5mA. The regulator operates from a 10-V supply and has a 1.2k-ohm load.
Determine the output frequency for a frequency division circuit that contains 12 flip-flops with an input clock frequency of 20.48 MHz.
Design an opamp circuit to perfom the following mathmatical operations on three seperate ideal voltage sorces, V1, V2, and V3. V0 = 10V1 + 4V2 - 8V3
1. What is the effect of increasing the quantization levels on the quantization error in a PCM signal 2. How can we increase the data rate in a digital signal
A transmission line having a 50 ohm characteristic impedance is to drive a load of 200 ohms. 1)What is the reflection coefficient if the line is connected directly to the load 2) What is the standing wave ratio on the main line under the conditions o..
The line is terminated in a load RL = 25 ohm. Use the bounce diagram to plot V(t) at a point midway along the length of the line from t = 0 to t = 25 ns.
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