Gibilisco - Impedance And Admittance
- 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 thingsbeing 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 thisindicates
- 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.
Complex admittance.
- 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.
Imaginary farads.
- 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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