# Gibilisco's Impedance And Admittance Quiz

20 Questions | Attempts: 634
Share  Settings  Impedance is the amount of alternating current impeded by the circuit; Admittance is reciprocal to it. Take the informative quiz by Gibilisco that gauges how much you know about the topic. Impedance and Admittance form one of the important topics that are usually asked in the exam. The quiz also provides you with valuable information. It has a wide coverage of easy, medium, to hard-level questions. So let's see how prepared you are to attempt these questions. If you find the quiz helpful, do share it with your friends. All the best!

• 1.
The square of an imaginary number
• A.

Can never be negative

• B.

Can never be positive

• C.

Can be either positive or negative

• D.

Is equal to j

• 2.
A complex number
• A.

Is the same thing as an imaginary number

• B.

Has a real-number part and an imaginary-number part

• C.

Is one-dimensional

• D.

Is a concept reserved for elite mathematicians

• 3.
What is the sum of 3 + j 7 and −3 − j 7?
• A.

0 + j0

• B.

6 + j14

• C.

−6 − j14

• D.

0 − j14

• 4.
What is (−5 + j 7) − (4 − j5)?
• A.

−1 + j2

• B.

−9 − j2

• C.

−1 − j2

• D.

−9 + j12

• 5.
What is the product (−4 − j 7)(6 − j2)?
• A.

24 − j14

• B.

−38 − j34

• C.

−24 − j14

• D.

−24 + j14

• 6.
What is the magnitude of the vector 18 − j24?
• A.

6

• B.

21

• C.

30

• D.

52

• 7.
The complex impedance value 5 + j0 represents
• A.

A pure resistance

• B.

A pure inductance

• C.

A pure capacitance

• D.

An inductance combined with a capacitance

• 8.
The complex impedance value 0 − j22 represents
• A.

A pure resistance

• B.

A pure inductance

• C.

A pure capacitance

• D.

An inductance combined with a resistance

• 9.
What is the absolute-value impedance of 3.0 − j 6.0?
• A.

Z = 9.0 Ω

• B.

Z = 3.0 Ω

• C.

Z = 45 Ω

• D.

Z = 6.7 Ω

• 10.
What is the absolute-value impedance of 50 − j235?
• A.

Z = 240 Ω

• B.

Z = 58,000 Ω

• C.

Z = 285 Ω

• D.

Z =−185 Ω

• 11.
If the center conductor of a coaxial cable is made to have a smaller diameter, all other things being equal, what will happen to the Zo of the transmission line?
• A.

It will increase

• B.

It will decrease

• C.

It will not change

• D.

There is no way to determine this without knowing the actual dimensions

• 12.
If a device is said to have an impedance of Z = 100 Ω, you can reasonably expect that this indicates
• A.

R + jX = 100 + j0

• B.

R + jX = 0 + j100

• C.

R + jX = 100 + j100

• D.

The reactance and the resistance add up to 100 Ω

• 13.
Suppose a capacitor has a value of 0.050 µF at 665 kHz. What is the capacitive susceptance,stated as an imaginary number?
• A.

BC = j4.79

• B.

BC =−j4.79

• C.

BC = j0.209

• D.

BC =−j 0.209

• 14.
An inductor has a value of 44 mH at 60 Hz. What is the inductive susceptance, stated as animaginary number?
• A.

BL =−j0.060

• B.

BL = j0.060

• C.

BL =−j17

• D.

BL = j17

• 15.
Susceptance and conductance add to form
• A.

Complex impedance

• B.

Complex inductance

• C.

Complex reactance

• D.

• 16.
Absolute-value impedance is equal to the square root of which of the following?
• A.

G^2+ B^2

• B.

R^2+ X^2

• C.

Zo

• D.

Y^2+ R^2

• 17.
Inductive susceptance is defined in
• A.

Imaginary ohms

• B.

Imaginary henrys

• C.

• D.

Imaginary siemens

• 18.
Capacitive susceptance values can be defined by
• A.

Positive real numbers

• B.

Negative real numbers

• C.

Positive imaginary numbers

• D.

Negative imaginary numbers

• 19.
Which of the following is false?
• A.

BC = 1/XC

• B.

Complex impedance can be depicted as a vector

• C.

Characteristic impedance is complex

• D.

G = 1/R

• 20.
In general, as the absolute value of the impedance in a circuit increases,
• A.

The flow of ac increases

• B.

The flow of ac decreases

• C.

The reactance decreases

• D.

The resistance decreases

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