ELECTRICITY FOR TRADES (LL W/ACCESS)
3rd Edition
ISBN: 9781260699487
Author: Petruzella
Publisher: MCG CUSTOM
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The excitation of a three-phase synchronous motor connected in parallel with a load of 500 kW
operating at 0-85 p.f. lagging is adjusted to improve the overall p.f. of the system to 0.95 lagging. If the
mechanical load on the motor is 120 kW, calculate the kVA input to the synchronous motor and its p.f.?
A domestic load of 2300 kW at 0.88 p.f lagging and a motors load of 3400 kW at 0.85 p.f lagging are
supplied by two alternators operating in parallel. If one alternator is delivering a load of 3300 kW at 0.9 p.f
lagging, what will be the output power and p.f of the other alternator?
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- Design a bank of capacitors to provide 60V and 2kWh energy to capture and store regen breaking energy. Use commercial supercapacitor cells at 3V and 3600F. Capacitor voltage drops almost linearly during discharge and below half voltage maximum it doesn’t provide significant power. If we discharge a fully charged capacitor to its half voltage maximum, how much energy can be discharged compared to a full-discharged capacitor (show your calculation)?arrow_forward8-1) similar to Lathi & Ding, Prob. P.5.1-2 The figure below shows the Fourier spectra of signals of g,(t) and g₁(t). Determine the Nyquist rate and the corresponding sampling interval for signals of g,(t), g,(t), g₁(1) - g¸(1), g¸³(t), and g₁(1)g₁(1). Hint: Use the frequency convolution and the width property of convolution. G₁(f) G₂(f) -8000 0 8000 f -20000 10 20000 farrow_forwardCalculate the approximate values of the starting current, full-load current, and no- load current of a 150 horsepower, 575 V, 3- phase induction motor.arrow_forward
- Capacitor voltage drops almost linearly during discharge and below half voltage maximum it doesn’t provide significant power. If we discharge a fully charged capacitor to its half voltage maximum, how much energy can be discharged compared to a full-discharged capacitor (show your calculation)?arrow_forwardDesign a bank of capacitors to provide 60V and 2kWh energy to capture and store regen breaking energy. Use commercial supercapacitor cells at 3V and 3600F.arrow_forwardPlease explain in step by step detail how to answer and solve this problemarrow_forward
- Two loads connected in parallel are respectively 2 kW at a pf of 0.75 leading and 4 kW at a pf of 0.95 lagging. Calculate the pf of the combined two loads. Find the complex power supplied by the source. Hints: • • Since the two loads are parallel, the complex power, S, supplied by the source is S = S₁+ S₂ Calculate the complex powers, S₁ and S2, of each load (use power triangles) and add them to find the total S. Calculate 0 and obtain pf.arrow_forwardA 3-phase, 20-pole induction motor is con- nected to a 600 V, 60 Hz source. a. What is the synchronous speed? b. If the voltage is reduced to 300 V, will the synchronous speed change? c. How many groups are there, per phase?arrow_forwardStarting from Maxwell’s equations derive the Kirchohf’s circuit laws for voltage and current. Clearly mention what approximation is used for this derivation.arrow_forward
- In the control system shown in Figure Q4(a), G₁(s) = and G₂(s) == If the system has the specifications for the natural frequency and dampingratio of -5 rad/sec and {=0.7, respectively, determine K and H,(s) when H₂(s) = 1.arrow_forwardCan the expert help me draw a curve on my graph paper? TERMINAL VOLTS 9000 8000 7000 6000 5000 4100 4000 14 18 22 26 30 34 38 FIELD AMPERES, If OPEN CIRCUIT CHARACTERSTICS Fig 3 42 42 46 50 54arrow_forwardSolve this problem and show all of the workarrow_forward
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