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1. How can electric infrared heaters be mounted?
2. What distance should an electric infrared heater be from any other surface?
3. How are mats for electric heat floor panels constructed?
4. What is mineral insulated (MI) heating cable?
An amplifier operates from -5V and +5V balanced power supplies. It provides a 3.2-Vpeak sine across a 150 ohm load when provided with a 0.2-V peak input from which 2.0mA peak is drawn. The average current in each supply is 20mA.
A 120V(rms), variable-frequency source is connected in series with a 100Ω resistor and 100μF Capacitor. Find the input power to the circuit from the source at the frequency where the power factor of thr load is 0.75.
Identify at least two shortcomings of PCM as implemented today regarding its suitability for ISDN. (Hint: Think standards.) ? PCM, as designed, is optimized for speech telephony. Approximately what percentage of traffic on the PSTN is speech tele..
Minimize the following incompletely specified sequential circuits if possible; implement the circuits using D flip-flops as memory elements.
Determine which of these properties hold or don't hold for the following discrete time systems. Justify your answers. IN each example, y(t) denotes the system output and x(t) denotes the system input.
An AM modulator is operation with an index of 0.4. The modulation input is m(t) = 4 cos(3πfmt) + 2 cos(5πfmt) + 4 cos(7πfmt) (a) Sketch the spectrum of the modulator ouput showing the weights of all impulse functions.
Consider three identical metal spheres that are mounted on insulating stands. Sphere X is neutral, sphere Y has a charge -1q, and sphere Z has a charge +4q. X and Y are touched together and then separated.
Two transformers, A and B, are both suitable. While both transformers have the same efficiency at peak load, most of the loss in A is due to core loss, and most of the loss in B is due to the resistances of the coils. From the standpoint of operat..
a temperature sensor has a static transfer function of 0.15 mvcdeg and a time constant of 3.3 s. if a step change of
When a capacitor is connected across a 200 V supply it takes a charge of 8 μC.
Show that the electric field at a point of the model is nin-2 times the field at the corresponding point of the actual system.
an electron in a periodic potential. Why do we get these different band schemes?
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