Delmars Unit 20 Capacitance in AC Circuits. questions and answers already solved 2024

Delmars Unit 20 Capacitance in AC
Circuits
Three capacitors, a 12 μF, a 20 μF, and a 30 μF, are connected in series to a
400 Hz source. What is the total XC?
42.78 Ω
36.42 Ω
52.09 Ω
66.32 Ω - correct answer ✔66.32 Ω


Two capacitors, a 20 μF and a 30 μF, are connected in parallel to a 400 Hz
source. What is the total capacitive reactance?
42.04 Ω
33.16 Ω
7.96 Ω
53.05 Ω - correct answer ✔7.96 Ω


The power in a capacitor is reactive power. What is the unit for reactive
power?
W
P
VA
VAR - correct answer ✔VAR


A 1 μF capacitor has 2,652 Ω of reactance at 60 Hz. What is the reactance
value at 400 Hz?
639.79 Ω

, 568.72 Ω
397.88 Ω
768.33 Ω - correct answer ✔397.88 Ω


When a capacitor is connected to a(n) _____ circuit, current appears to flow
through the capacitor.
AC
DC - correct answer ✔AC


In a circuit containing a capacitor, the impressed voltage is _____ with the
applied voltage.
180° out of phase
90° out of phase
270° out of phase
in phase - correct answer ✔180° out of phase


What is the reactance of a 25 μF capacitor when the applied frequency is 400
Hz?
16.12 Ω
11.59 Ω
10.61 Ω
15.92 Ω - correct answer ✔15.92 Ω


Two capacitors, a 20 μF and a 30 μF, are connected in parallel to a 60 Hz
source. What is the total capacitive reactance?
7.96 Ω
53.05 Ω