Multiple choice 4. The unit(s) of inductance is (are)(A) henry(C) Wb/Á(B) Vs/A(D) all of the above5. If an emf of 8V is induced in a coil of inductance 4 H, therate of change of current through it must be(A) 32 A/s(C) 2 A/s(B) 0.5 A/s(D) 12 A/s6. The iron core from an iron-cored coil is removed so thatit becomes air-cored. The inductance of the coil will(A) decrease(C) remains the same (D) any of the above7. A coil having a core of length 10 cm has an inductanceof 5 mH. If its core length is doubled, all other quantitiesremaining the same, the inductance will becomemH.(B) increase(A) 1.25(C) 10(B) 2.5(D) 28. In a series RL circuit excited by a battery, the final valueof current in the circuit does not depend on(A) battery emf E(C) inductance L (D) both E and L(B) resistance R9. When a circuit is switch off, sparking may occur if thecircuit is(A) highly resistive(C) highly capacitive(B) highly inductive(D) all of the above10. For a series RC circuit excited by a dc voltage Vo, theinitial current is(A) zero(C) V/R(B) infinity(D) V/C

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Delmar's Standard Textbook Of Electricity

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Publisher:Stephen L. Herman

Chapter20: Capacitance In Ac Circuits

Section: Chapter Questions

Problem 2PA: You are working in an industrial plant. You have been instructed to double the capacitance connected...

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Inductive Circuits Fill in all the missing values. Refer to the following formulas: XL=2fLL=XL2ff=XL2L Inductance (H) Frequency (Hz) Inductive Reactance ( ) 1.2 60 0.085 213.628 1000 4712.389 0.65 600 3.6 678.584 25 411.459 0.5 60 0.85 6408.849 20 201.062 0.45 400 4.8 2412.743 1000 40.841
Fill in all the missing values. Refer to the formulas that follow. Resistance Capacitance Time constant Total time 150 k 100 F 350 k 35 s 350 pF 10 s 0.05 F 1.2 M 0.47 F 12F 0.05 s 86 k 1.5 s 120 k 470 pF 250 nF 100 ms 8 F 150 s 100 k 150 ms 33 k 4 F =RCR=CC=R Totaltime=5
You are a journeyman electrician working in an industrial plant. Your task is to connect an inductor to a 480-V, 60-Hz line. To determine the proper conductor and fuse size for this installation, you need to know the amount of current the inductor will draw from the line. The nameplate on the inductor indicates that it has an inductance of 0.1 H. An ohmmeter reveals that it has a wire resistance of 10 . How much current should this inductor draw when connected to the line?
You are working in an industrial plant. You have been instructed to double the capacitance connected to a machine. The markings on the capacitor, however, are not visible. The capacitor is connected to 560 volts and an ammeter indicates a current of 6 amperes flowing to the capacitor. What size capacitor should be connected in parallel with the existing capacitor? What is the minimum AC voltage rating of the new capacitor? What is the minimum DC voltage rating of the new capacitor? What is the minimum KVAR size that can be used in this installation?
Assume that the voltage drop across the resistor, ER, is 78 V, that the voltage drop across the inductor, EL, is 104 V, and the circuit has a total impedance, Z, of 20 . The frequency of the AC voltage is 60 Hz. ETITZ20VAPFER78VIRRPEL104VILXLVARsLL
Assume that the voltage drop across the resistor, ER, is 78 V; the voltage drop across the capacitor, EC, is 104 V; and the circuit has a total impedance, Z, of 20 . The frequency of the AC voltage is 60 Hz. Find the missing values. ET ER78V EC104V IT IR IC Z20 R XC VA P VARSC PF C
The circuit is connected to a 60-Hz line. The apparent power in the circuit is 29.985 VA, and the power factor is 62.5%. The resistor has a voltage drop of 14.993 V, the inductor has an inductive reactance of 60 , and the capacitor has a capacitive reactance of 45 . ETITZVA29.985PF62.5%ER14.993VIRRPELILXL60VARsLLECICXC45VARsCC
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The unit(s) of inductance is (are) (A) henry (C) Wb/A (B) Vs/ (D) all c