Homework 4
0.000000008H inductance
An 0.05 μH inductance is larger than a
Iron core
Do iron-core inductors or air-core inductors generally have the larger inductance?
Current, voltage
In an inductive circuit, the ________ lags the ________.
False
Inductive reactance decreases as frequency increases.
True
Inductors in series or parallel combine just like resistors in series or parallel.
High frequencies
Stray capacitance for a coil becomes a problem:
QL=2πfL/rW
The quality factor of a coil or inductor is calculated by:
All of these
The time constant for an inductor for each time period:
False
The total inductance of two parallel inductors equals the sum of their inductance values.
False
The voltage and current are in phase in an inductive circuit.
True
The voltage leads the current in an inductive circuit.
False
True power for an inductor is measured in VAR rather than watts.
less than 0.1 mH
If a 1 mH, 3.3 mH, and 0.1 mH inductor are connected in parallel, LT equals
0.213 μS
What is one time constant for a 10 mH inductor connected in series with a 47 kΩ resistor?
1.26Ω
What is the inductive reactance of a 0.2 mH inductor operating at 1 kHz
23.3 MHz
If a 15 μH inductor has a 2.2 KΩ reactance, the frequency equals
62.8Ω
If a 25 mH inductor drops 50 V while operating at 400 Hz, what is XL?
32.4kHz
If a 27 m H inductor has a reactance of 5.5 kΩ, the frequency equals
62.8Ω
What is the reactance of a 100 μH inductor operating at 100 kHz?
65 mH
What is the total inductance if a 50 mH inductor is connected in series with a 15 mH inductor?
