Zu Test For South African Amateur Radio Licence
(15).webp "Zu Test For South African Amateur Radio Licence - Quiz")
Preperation ZU test for South African Amateur Radio Licence
Questions and Answers
- 1.
The unit of measure for Inductance is?
- A.
Ohms
- B.
Meters
- C.
Volts
- D.
Henry
Correct Answer
D. HenryExplanation
The unit of measure for inductance is Henry. Inductance is a property of an electrical circuit that opposes any change in current flow. It is represented by the symbol "H" and is named after Joseph Henry, an American scientist who made significant contributions to the field of electromagnetism. Ohms, meters, and volts are units of measure for resistance, length, and voltage, respectively, and are not applicable to inductance.Rate this question:
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- 2.
Within what time period do you have to inform ICASA if you move to a new residence ?
- A.
15 days
- B.
30 days
- C.
14 days
- D.
22 days
Correct Answer
C. 14 daysExplanation
When moving to a new residence, it is necessary to inform ICASA within 14 days. This timeframe allows ICASA to update their records and ensure that the individual's communication services, such as phone lines or internet connections, can be transferred smoothly to the new address. Failing to inform ICASA within this period may lead to disruptions in service or delays in receiving important communications.Rate this question:
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- 3.
The Q code QTH refers to ?
- A.
Location
- B.
Your signal strength
- C.
Your transmitted power
- D.
The quality of your signal
Correct Answer
A. LocationExplanation
The Q code QTH is used in amateur radio to inquire about the location of the station being contacted. It is a standard code that allows operators to quickly and efficiently exchange information during radio communication. Therefore, the correct answer is "Location."Rate this question:
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- 4.
The word SOUTH in PHONETIC ALPHABET is?
- A.
Salt Old Uniform Too Hello
- B.
Sierra Oscor Uniform Tango Hotel
- C.
See Our United Take Hold
- D.
Sea Our Umbrella Taken Home
Correct Answer
B. Sierra Oscor Uniform Tango HotelExplanation
The correct answer is Sierra Oscor Uniform Tango Hotel. In the NATO phonetic alphabet, each letter is represented by a specific word to avoid confusion and miscommunication. The word "SOUTH" is spelled out using the phonetic words Sierra, Oscor, Uniform, Tango, and Hotel.Rate this question:
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- 5.
A capacitor and inductor connected in parallel, form?
- A.
A circuit
- B.
A resonant circuit
- C.
A long wire
- D.
A battery
Correct Answer
B. A resonant circuitExplanation
When a capacitor and an inductor are connected in parallel, they form a resonant circuit. A resonant circuit is a circuit that can store and release energy at a specific frequency. It consists of an inductor, which stores energy in its magnetic field, and a capacitor, which stores energy in its electric field. The combination of these two components allows the circuit to resonate at a specific frequency, resulting in a highly efficient transfer of energy between the capacitor and the inductor. This resonant behavior is commonly used in applications such as radio tuning circuits and power factor correction.Rate this question:
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- 6.
What power are ZU licence holders permitted to transmit?
- A.
1 dBw
- B.
20 Watts
- C.
100 Watts
- D.
2 Watts
Correct Answer
B. 20 WattsExplanation
ZU licence holders are permitted to transmit with a power of 20 Watts. This means that they can transmit signals with a maximum power output of 20 Watts.Rate this question:
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- 7.
When normal communications systems are not available, what bands may an amateur station use to provide essential communications when there is an immediate threat to the safety of human life or the protection of property?
- A.
Use the cell phone
- B.
Any band
- C.
Only use the bands that the station is licensed for.
- D.
Only use morse code
Correct Answer
B. Any bandExplanation
In emergency situations where regular communication systems are down, an amateur station may use any band to provide essential communications for the safety of human life or property protection. This allows for flexibility and the ability to utilize any available frequency to establish vital communication links during emergencies when immediate action is required.Rate this question:
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- 8.
To measure the voltage present at a component in a circuit the voltmeter must be placed...
- A.
In series with the component to be tested
- B.
In parallel with component the circuit
- C.
On the table next to the circuit
- D.
In parallel with the power supply
Correct Answer
B. In parallel with component the circuitExplanation
The voltmeter must be placed in parallel with the component in the circuit in order to measure the voltage. Placing it in parallel allows the voltmeter to measure the potential difference across the component. If it were placed in series with the component, it would disrupt the flow of current and give an inaccurate reading.Rate this question:
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- 9.
Capacitance is measured in
- A.
Ohms
- B.
Volts
- C.
Farad
- D.
Henry
Correct Answer
C. FaradExplanation
Capacitance is a measure of an object's ability to store electrical charge. It is the ratio of the amount of charge stored on an object to the potential difference (voltage) across the object. The unit of capacitance is the farad, which is equal to one coulomb per volt. Therefore, the correct answer is Farad.Rate this question:
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- 10.
If the VSWR of an antenna is measured and found to be 1:3 at the frquency you wish to transmit at , what needs to be done in order to match the antenna better?
- A.
Stop transmitting
- B.
Work on the antenna
- C.
Increase the power
- D.
Decreas the voltage
Correct Answer
B. Work on the antennaExplanation
To match the antenna better, working on the antenna is necessary. The VSWR (Voltage Standing Wave Ratio) of 1:3 indicates that there is a mismatch between the antenna and the transmission line. This can lead to poor signal transmission and potential damage to the transmitter. By working on the antenna, adjustments can be made to improve its impedance match with the transmission line, resulting in better signal transmission efficiency.Rate this question:
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- 11.
Which wire in a 3-conductor power cord should be attached to the earth in a device operated from a 220-VAC single-phase source?
- A.
Blue wire
- B.
Green/ Yellow wire
- C.
Brown wire
- D.
White wire
Correct Answer
B. Green/ Yellow wireExplanation
The green/yellow wire in a 3-conductor power cord should be attached to the earth in a device operated from a 220-VAC single-phase source. This wire is commonly known as the ground wire and is responsible for providing a safe path for electrical current to flow in case of a fault or short circuit. By connecting the device's metal casing to the ground wire, any excess electrical current will be safely directed to the ground, preventing the risk of electric shock to the user.Rate this question:
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- 12.
What must you transmit to identify your amateur station?
- A.
Your full name
- B.
Your first name and location?
- C.
Your call sign
- D.
Your ID number
Correct Answer
C. Your call signExplanation
To identify your amateur station, you must transmit your call sign. A call sign is a unique combination of letters and numbers assigned to each amateur radio operator. It serves as a form of identification and is used to differentiate between different stations during communication. Transmitting your call sign allows other operators to identify you and establish contact.Rate this question:
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- 13.
Which of the following should you do when selecting a frequency on which to transmit?
- A.
Call CQ to see if anyone is listening.
- B.
Listen to determine if the frequency is busy.
- C.
Check for maximum power output.
- D.
Talk loudly until other transmissions stop
Correct Answer
B. Listen to determine if the frequency is busy.Explanation
When selecting a frequency to transmit on, it is important to listen first to determine if the frequency is already being used by someone else. This is done to avoid interference and ensure efficient communication. By listening, you can ensure that the frequency is not busy and choose a clear channel to transmit on.Rate this question:
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- 14.
What formula is used to calculate current in a circuit?
- A.
Current (I) equals voltage (V) multiplied by resistance (R).
- B.
Current (I) equals voltage (V) divided by resistance (R).
- C.
Current (I) equals voltage (V) added to resistance (R).
- D.
Current (I) equals voltage (V) minus resistance (R).
Correct Answer
B. Current (I) equals voltage (V) divided by resistance (R).Explanation
The formula used to calculate current in a circuit is I = V/R, where I represents current, V represents voltage, and R represents resistance. This formula states that current is equal to voltage divided by resistance.Rate this question:
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- 15.
What frequencies can be used on the 2 Meter band
- A.
From 144 Mhz to 146Mhz
- B.
From 144.5Mhz to 145.5 Mhz
- C.
From 3.5Mhz to 3.8Mhz
- D.
From 28.8Mhz to 29.9Mhz
Correct Answer
A. From 144 Mhz to 146MhzExplanation
The correct answer is "From 144 Mhz to 146Mhz." This is because the 2 Meter band is allocated for amateur radio use in the frequency range of 144 MHz to 148 MHz. Therefore, any frequencies within this range can be used on the 2 Meter band.Rate this question:
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- 16.
What is the resistance of a circuit when a current of 3 amperes flows through a resistor connected to 90 volts?
- A.
3 ohms
- B.
30 ohms
- C.
25 ohms
- D.
90 ohms
Correct Answer
B. 30 ohmsExplanation
The resistance of a circuit can be calculated using Ohm's Law, which states that resistance is equal to voltage divided by current. In this case, the voltage is given as 90 volts and the current is given as 3 amperes. By dividing 90 volts by 3 amperes, we get a resistance of 30 ohms.Rate this question:
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Current Version
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Apr 24, 2024Quiz Edited by
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Jul 28, 2009Quiz Created by
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