Canadian Basic pool, section 5-10

Basic

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Subelement 5

Basic Electronics and Theory

Section 5-10

introduction to reactance, impedance

5-10-01

How does a coil react to AC?

A.
As the amplitude of the applied AC increases, the reactance decreases
B.
As the amplitude of the applied AC increases, the reactance increases
Correct Answer
C.
As the frequency of the applied AC increases, the reactance increases
D.
As the frequency of the applied AC increases, the reactance decreases

5-10-01

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5-10-02

How does a capacitor react to AC?

Correct Answer
A.
As the frequency of the applied AC increases, the reactance decreases
B.
As the frequency of the applied AC increases, the reactance increases
C.
As the amplitude of the applied AC increases, the reactance increases
D.
As the amplitude of the applied AC increases, the reactance decreases

5-10-02

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5-10-03

The reactance of capacitors increases as:

A.
applied voltage increases
Correct Answer
B.
AC frequency decreases
C.
applied voltage decreases
D.
AC frequency increases

5-10-03

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5-10-04

In inductances, AC may be opposed by both resistance of winding wire and reactance due to inductive effect. The term which includes resistance and reactance is:

A.
resonance
B.
inductance
Correct Answer
C.
impedance
D.
capacitance

5-10-04

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5-10-05

Capacitive reactance:

Correct Answer
A.
decreases as frequency increases
B.
applies only to series RLC circuits
C.
increases as frequency increases
D.
increases with the time constant

5-10-05

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5-10-06

Inductive reactance may be increased by:

A.
a decrease in the applied frequency
B.
a decrease in the supplied current
C.
an increase in the applied voltage
Correct Answer
D.
an increase in the applied frequency

5-10-06

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5-10-07

A choke coil of 4.25 microhenrys is used in a circuit at a frequency of 200 MHz. Its reactance is approximately:

A.
5 740 ohms
Correct Answer
B.
5 340 ohms
C.
7 540 ohms
D.
4 750 ohms

5-10-07

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5-10-08

The capacitive reactance of a 25 microfarad capacitor connected to a 60 hertz line is:

Correct Answer
A.
106.1 ohms
B.
9 420 ohms
C.
2.4 ohms
D.
1 500 ohms

5-10-08

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5-10-09

A power-supply filter has a capacitor of 10 microfarad. What is the capacitive reactance of this capacitor to a frequency of 60 hertz?

A.
200 ohms
B.
100 ohms
C.
500 ohms
Correct Answer
D.
265 ohms

5-10-09

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5-10-10

What is the approximate inductive reactance of a 1 henry choke coil used in a 60 hertz circuit?

Correct Answer
A.
376 ohms
B.
3760 ohms
C.
188 ohms
D.
1888 ohms

5-10-10

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5-10-11

In general, the reactance of inductors increases with:

Correct Answer
A.
increasing AC frequency
B.
decreasing AC frequency
C.
decreasing applied voltage
D.
increasing applied voltage

5-10-11

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