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bảng tínhHam Radio Extra Questions Till 2020 Set E5C
Total câu hỏi: 17
Worksheet time: 17mins
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1.
E5C01 Which of the following represents a capacitive reactance in rectangular notation?
a)
A. –jX
b)
B. +jX
c)
C. X
d)
D. Omega
2.
E5C02 How are impedances described in polar coordinates?
a)
A. By X and R values
b)
B. By real and imaginary parts
c)
C. By phase angle and amplitude
d)
D. By Y and G values
3.
E5C03 Which of the following represents an inductive reactance in polar coordinates?
a)
A. A positive real part
b)
B. A negative real part
c)
C. A positive phase angle
d)
D. A negative phase angle
4.
E5C04 Which of the following represents a capacitive reactance in polar coordinates?
a)
A. A positive real part
b)
B. A negative real part
c)
C. A positive phase angle
d)
D. A negative phase angle
5.
E5C05 What is the name of the diagram used to show the phase relationship between impedances at a given frequency?
a)
A. Venn diagram
b)
B. Near field diagram
c)
C. Phasor diagram
d)
D. Far field diagram
6.
E5C06 What does the impedance 50–j25 represent?
a)
A. 50 ohms resistance in series with 25 ohms inductive reactance
b)
B. 50 ohms resistance in series with 25 ohms capacitive reactance
c)
C. 25 ohms resistance in series with 50 ohms inductive reactance
d)
D. 25 ohms resistance in series with 50 ohms capacitive reactance
7.
E5C07 What is a vector?
a)
A. The value of a quantity that changes over time
b)
B. A quantity with both magnitude and an angular component
c)
C. The inverse of the tangent function
d)
D. The inverse of the sine function
8.
E5C08 What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance?
a)
A. Maidenhead grid
b)
B. Faraday grid
c)
C. Elliptical coordinates
d)
D. Polar coordinates
9.
E5C09 When using rectangular coordinates to graph the impedance of a circuit, what does the horizontal axis represent?
a)
A. Resistive component
b)
B. Reactive component
c)
C. The sum of the reactive and resistive components
d)
D. The difference between the resistive and reactive components
10.
E5C10 When using rectangular coordinates to graph the impedance of a circuit, what does the vertical axis represent?
a)
A. Resistive component
b)
B. Reactive component
c)
C. The sum of the reactive and resistive components
d)
D. The difference between the resistive and reactive components
11.
E5C11 What do the two numbers that are used to define a point on a graph using rectangular coordinates represent?
a)
A. The magnitude and phase of the point
b)
B. The sine and cosine values
c)
C. The coordinate values along the horizontal and vertical axes
d)
D. The tangent and cotangent values
12.
E5C12 If you plot the impedance of a circuit using the rectangular coordinate system and find the impedance point falls on the right side of the graph on the horizontal axis, what do you know about the circuit?
a)
A. It has to be a direct current circuit
b)
B. It contains resistance and capacitive reactance
c)
C. It contains resistance and inductive reactance
d)
D. It is equivalent to a pure resistance
13.
E5C13 What coordinate system is often used to display the resistive, inductive, and/or capacitive reactance components of impedance?
a)
A. Maidenhead grid
b)
B. Faraday grid
c)
C. Elliptical coordinates
d)
D. Rectangular coordinates
14.
E5C14 Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 400 ohm resistor and a 38 picofarad capacitor at 14 MHz?
a)
A. Point 2
b)
B. Point 4
c)
C. Point 5
d)
D. Point 6
15.
E5C15 Which point in Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and an 18 microhenry inductor at 3.505 MHz?
a)
A. Point 1
b)
B. Point 3
c)
C. Point 7
d)
D. Point 8
16.
E5C16 Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and a 19 picofarad capacitor at 21.200 MHz?
a)
A. Point 1
b)
B. Point 3
c)
C. Point 7
d)
D. Point 8
17.
E5C17 Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor, a 0.64-microhenry inductor and an 85-picofarad capacitor at 24.900 MHz?
a)
A. Point 1
b)
B. Point 3
c)
C. Point 5
d)
D. Point 8
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