1. Find the equivalent impedance of the given circuit. Use 2kHz as frequency. 50 2 10 mH 100 Q 2 µF 2. The instantaneous voltage and current equations of an ac circuit are v(t)= 200 sin377t V and i(t)= 8 sin (377t-30°) A respectively. Determine the apparent power in complex form. A. 296.8+j400 B. 962.8+j400 C. 692.8+j400 D.692.8+j200
1. Find the equivalent impedance of the given circuit. Use 2kHz as frequency. 50 2 10 mH 100 Q 2 µF 2. The instantaneous voltage and current equations of an ac circuit are v(t)= 200 sin377t V and i(t)= 8 sin (377t-30°) A respectively. Determine the apparent power in complex form. A. 296.8+j400 B. 962.8+j400 C. 692.8+j400 D.692.8+j200
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Transcribed Image Text:1. Find the equivalent impedance of the given circuit. Use 2kHz as frequency.
50 2
10 mH
100 2
2 µF
80 2
2. The instantaneous voltage and current equations of an ac circuit are v(t)= 200 sin377t V and
i(t)= 8 sin (377t-30°) A respectively. Determine the apparent power in complex form.
A. 296.8+j400
B. 962.8+j400
C. 692.8+j400
D.692.8+j200
3. Two impedances, Z1 = 0.8 + j5.6 and Zz = 8-j16 and a single-phase motor are connected in
parallel across 200 Vrms, 60HZ supply. The motor draws 5 kVA at 80% power factor lagging. Find
the total complex power.
A. 4-j3 kVÁ
B.7+j5 kVA
4. A circuit has impedance of 3.464+j2.0 ohm is supplied from a source voltage of 240 volts, 60
Hz. What is the current when resistance is reduced by 50%?
C. 6 + j2 kVA
D. 1+ j7 kVA
C. 72 A
D. 54A
A. 91 A
В. 6ОА
5. A resistance of 30 ohms and an inductive reactance of 60 ohms are in series across 120
volts, 60 cycles source. Find the power factor in percent of the circuit?
С. 87
D. 75
A. 45
В. 67
6. A series RLC circuit is excited by a 100 volts 79.6 Hz source. Resistance R is 100 ohms,
inductance L is 1 H and capacitance C is 5 micro farad. Calculate the voltage across C.
A. 353.5/45°
C. 70.7/-45°
В. 332.6/35°
D. 282.8/-135°
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