NEW
Font size
S
M
L
XL
WorksheetsHam Radio General Questions Till 2019 Set G5A
Total questions: 13
Worksheet time: 13mins
Name
Class
Date
1.
G5A01 What is impedance?
a)
A. The electric charge stored by a capacitor
b)
B. The inverse of resistance
c)
C. The opposition to the flow of current in an AC circuit
d)
D. The force of repulsion between two similar electric fields
2.
G5A02 What is reactance?
a)
A. Opposition to the flow of direct current caused by resistance
b)
B. Opposition to the flow of alternating current caused by capacitance or inductance
c)
C. A property of ideal resistors in AC circuits
d)
D. A large spark produced at switch contacts when an inductor is
3.
G5A03 Which of the following causes opposition to the flow of alternating current in an inductor?
a)
A. Conductance
b)
B. Reluctance
c)
C. Admittance
d)
D. Reactance
4.
G5A04 Which of the following causes opposition to the flow of alternating current in a capacitor?
a)
A. Conductance
b)
B. Reluctance
c)
C. Reactance
d)
D. Admittance
5.
G5A05 How does an inductor react to AC?
a)
A. As the frequency of the applied AC increases, the reactance decreases
b)
B. As the amplitude of the applied AC increases, the reactance increases
c)
C. As the amplitude of the applied AC increases, the reactance decreases
d)
D. As the frequency of the applied AC increases, the reactance increases
6.
G5A06 How does a capacitor react to AC?
a)
A. As the frequency of the applied AC increases, the reactance decreases
b)
B. As the frequency of the applied AC increases, the reactance increases
c)
C. As the amplitude of the applied AC increases, the reactance increases
d)
D. As the amplitude of the applied AC increases, the reactance decreases
7.
G5A07 What happens when the impedance of an electrical load is equal to the output impedance of a power source, assuming both impedances are resistive?
a)
A. The source delivers minimum power to the load
b)
B. The electrical load is shorted
c)
C. No current can flow through the circuit
d)
D. The source can deliver maximum power to the load
8.
G5A08 Why is impedance matching important?
a)
A. So the source can deliver maximum power to the load
b)
B. So the load will draw minimum power from the source
c)
C. To ensure that there is less resistance than reactance in the circuit
d)
D. To ensure that the resistance and reactance in the circuit are equal
9.
G5A09 What unit is used to measure reactance?
a)
A. Farad
b)
B. Ohm
c)
C. Ampere
d)
D. Siemens
10.
G5A10 What unit is used to measure impedance?
a)
A. Volt
b)
B. Ohm
c)
C. Ampere
d)
D. Watt
11.
G5A11 Which of the following describes one method of impedance matching between two AC circuits?
a)
A. Insert an LC network between the two circuits
b)
B. Reduce the power output of the first circuit
c)
C. Increase the power output of the first circuit
d)
D. Insert a circulator between the two circuits
12.
G5A12 What is one reason to use an impedance matching transformer?
a)
A. To minimize transmitter power output
b)
B. To maximize the transfer of power
c)
C. To reduce power supply ripple
d)
D. To minimize radiation resistance
13.
G5A13 Which of the following devices can be used for impedance matching at radio frequencies?
a)
A. A transformer
b)
B. A Pi-network
c)
C. A length of transmission line
d)
D. All of these choices are correct
Reset
