Engineering Board Exam Reviewer · Circuit Theorems in AC Analysis · medium
What is the equivalent impedance of an inductive reactance of j10, in parallel with a capacitive reactance of -j40, , in rectangular form?
- -j8,
- j8,
- -j13.3,
- j13.3,
Answer
D. j13.3,
Solution
Z=(j10)(-j40)/j10-j40=400/-j30=j13.3, . The smaller reactance (the inductor) dominates, so the combination is inductive.
More Circuit Theorems in AC Analysis questions
- A network has a Thevenin voltage of 120 V (rms) and a Thevenin impedance of 30+j40, . What is the maximum average power it can deliver to…
- Find the equivalent impedance of (30+j40), in parallel with 60, , in polar form.
- A 100 0° V source has a series impedance of 3+j4, . Find the Norton equivalent current in polar form.
- The three equal impedances of the delta network shown are each Z =30+j60, . Find the impedance of each branch of the equivalent wye (Y)…
- In the circuit shown, a 240 V 0° source feeds a series branch of R1=50, and XL=60, , followed by R2=30, in parallel with a capacitor of…
- In the circuit shown, a 60 V 0° source feeds a series branch of R1=20, and XL=50, , followed by R2=30, in parallel with a capacitor of…
- A current source of 12 A 0° feeds two parallel branches, ZA=40, and ZB=60-j30, . Find the current in ZA in polar form.
- A 50 V 0° source drives a 20, resistor in series with an inductor of reactance j30, . The output is taken across the inductor. Find Vout…
- A source of 60 V 0° drives a branch Z1=60-j10, in series with the parallel branch Z2=10-j60, , as shown. A load ZL=30-j30, is connected…
- A source of 60 V 0° drives a branch Z1=20-j60, in series with the parallel branch Z2=-j50, , as shown. Terminals a and b are the open…