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?