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Assume that an alkaline D-cell battery can maintain an average voltage of 1.25 V for 90 hours in a 10 Ω load before becoming unusable. What average power is delivered to the load during the life of the battery?
A 3-phase 230 V, 9 kVA, 0.9 PF (lagging) load is supplied by 10 kVA, 1330/230 V, 60 Hz three-phase transformer connected in Y-?. The equivalent impedance of transformer referred to the low-voltage side is 0.12 + j0.25.
1.A shunt-connected DC motor operates at its rated terminal voltage. Its no-load speed is200 radians/second. At its rated torque of 500 Nm, its speed is 180 radian/second. Themotor is used to directly drive a load whose load torque TL depends on its ..
Design a combinational logic circuit on a seven segment in sequential order. Include the "-" betwen the day and the month and the month and year. 1. Show the truth table of values using whatever seven segment display u have (cathode or anode)
Signal generator‘s internal impedance is purely resistive and has an open-circuit voltage of 3.5 V. When the generator is loaded with 22 ohms of resistance, its terminal voltage drops to 2.8 V. What is the generator's output impedance (pure resist..
The armature of a shunt generator as a 0.05 ohms resistance. Each brush has effective resistance of 0.02 ohms. The terminal voltage is 100V while the current is 40A. What is the efficiency of the generator
The A/D converter has internal memory that can store up to 4x106 discrete samples. What is the maximum number of cycles of a 25 MHz analog sinewave that can be stored in the A/D converter's memory.
A 3-phase, 2300 V, 60 Hz, 12-pole, Y-connected synchronous motor has 4.5 ? per phase synchronous reactance and negligible stator winding resistance. The motor is connected to an infinite bus and draws 250 A at 0.8 power factor lagging.
Three single-phase, two-winding transformers, each reated 450 MVA, 20 kV/288.7 kV with leakage reactance Xeq=0.12 per unit, are connected to form a three-phase bank. The high voltage windings are connected in Y with solidly grounded neutral.
A photoresistor is connected series to a battery of 10 V with internal resistance of 5 Ohms. The ohmic resistance of the photoresistor changes by time through the day and expressed as: RLDR=20-(10/t) .
Light exerts pressure on surfaces on which if falls (radiation pressure). Will this pressure be greater on a shiny surface or a dark surface?
Characterize the environment as being accessible, deterministic, episodic, static, and continuous or not. What agent architecture is best for this domain?
Find the total impedance Zt, in rectangular and polar.- R1=2 ohms, R2=10 ohms Xc=6 ohms - (B) R1=1k ohm, R2=4k ohms,Xl1=3k ohms,Xl2=7k ohms.
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