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A permanent-magnet dc motor has RA = 0.5 Ω. With no load, it operates at 1070 rpm and draws 0.5 A from a 12.6-V source. Assume that rotational power loss is proportional to speed. Find the output power and efficiency for a load that drops the speed to 950 rpm.
Design a simple circuit diagram,to complete the following task.1)Green lamp light up when the system is ON. 2)Once the pushbutton is pressed, Green Lamp turns OFF and Red Lamp turns ON,Motor starts to spin.3) Once the sensor detect the motor rotat..
Write a function that takes inputs of yards and feet (whole numbers) and calculates and returns an output of the total number of miles (a floating-point value). There are 5280 feet per mile. There are 3 feet in a yard.
Assume the factory described in the previous problem is fed from a line having an impedance of 0.02 + j0.16 O. The voltage at the factory is maintained at 480 V(rms). Find the average power loss in the line before and after the load is added.
1. a painter is standing on a work platform that is 27 feet above ground level. for fall protection the workers
Design a 4-bit down counter with truncated sequence that count down a truncated sequence from 1111 to 0101. On reachingthe count value 0101, the counter must preset to 1111. Also draw its timing diagram.
How much hydrogen would be needed to give the car a range of 300 miles if the source of electricity is an on-board fuel cell with an efficiency that is 50% of the ideal?
High-capacity terrestrial microwave systems use double-sideband quadrature modula¬tion, the extension of QPSK, with (up to) 1024 signal points and Nyquist filtering, etc
A buffer amplifier with a gain of 1 V/V has an input resistance of 1M and an output resistance of 10 ohm. It is connected between a 1-V, 100-k ohm source and a 100-ohm load. What load voltage results and what are the corresponding voltage, current,..
While the researchers hypothesized that the use of a rocking chair could reduce POI duration, it is not unreasonable to hypothesize that the use of a rocking chair could increase POI duration. Based on this possibility, discuss the appropriateness..
The input impedance of a JFET used in COMMON SOURCE configuration, is defined by two considerations: The JFET itself has a VERY HIGH INPUT IMPEDANCE, because the input is the GATE to SOURCE junction that is REVERSE biased
A) If 220kV, 220 MVA with power factor 0.8 lagging is determined to be at the receiving end, calculate the voltage at the transmitting end. B) If 220kV, 220 MVA with power factor 0.8 lagging is determined to be at the receiving end
Three amplifiers with power gains of 15, 22, and 7 are cascaded. The input power is 120 µW. What is the output power of the final amplifier stage
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