| 1 |
A residual current device is recommended for protection in a mains power circuit because it:
|
|---|---|
| A | Reduces electrical interference from the circuit |
| B | Removes power to the circuit when the phase and neutral currents are not equal |
| C | Removes power to the circuit when the current in the phase wire equals the current in the earth wire |
| D | Limits the power provided to the circuit |
| 2 |
Wires carrying high voltages in a transmitter should be well insulated to avoid:
|
|---|---|
| A | Short circuits |
| B | Overheating |
| C | Over modulation |
| D | SWR effects |
| 3 |
For your safety, before checking a fault in a mains operated power supply unit, first:
|
|---|---|
| A | Short the leads of the filter capacitor |
| B | Turn off the power and remove the power plug |
| C | Check the action of the capacitor bleeder resistance |
| D | Remove and check the fuse in the power supply |
| 4 |
An earth wire should be connected to the metal chassis of a mains-operated power supply to ensure that if a fault develops, the chassis:
|
|---|---|
| A | Does not develop a high voltage with respect to earth |
| B | Does not develop a high voltage with respect to the phase lead |
| C | Becomes a conductor to bleed away static charge |
| D | Provides a path to ground in case of lightning strikes |
| 5 |
The purpose of using three wires in the mains power cord and plug on amateur radio equipment is to:
|
|---|---|
| A | Make it inconvenient to use |
| B | Prevent the chassis from becoming live in case of an internal short to the chassis |
| C | Prevent the plug from being reversed in the wall outlet |
| D | Prevent short circuits |
| 6 |
The correct colour coding for the phase wire in a flexible mains lead is:
|
|---|---|
| A | Brown |
| B | Blue |
| C | Yellow and green |
| D | White |
| 7 |
The correct colour coding for the neutral wire in a flexible mains lead is:
|
|---|---|
| A | Brown |
| B | Blue |
| C | Yellow and green |
| D | White |
| 8 |
The correct colour coding for the earth wire in a flexible mains lead is:
|
|---|---|
| A | Brown |
| B | Blue |
| C | Yellow and /or green |
| D | White |
| 9 |
The single-phase mains voltage and frequency use in Malaysia is:
|
|---|---|
| A | 240 V 50Hz |
| B | 110V 60Hz |
| C | 415V 50Hz |
| D | Depends on equipment |
| 10 |
Wires carrying high voltages in a transmitter should be well insulated to avoid:
|
|---|---|
| A | Short circuits |
| B | Overheating |
| C | Over modulation |
| D | SWR effects |
| 11 |
A residual current device is recommended for protection in a mains power circuit because it:
|
|---|---|
| A | Reduces electrical interference from the circuit |
| B | Removes power to the circuit when the phase and neutral currents are not equal |
| C | Removes power to the circuit when the current in the phase wire equals the current in the earth wire |
| D | Limits the power provided to the circuit |
| 12 |
An earth wire should be connected to the metal chassis of a main operated power supply to ensure that if a fault develops, the chassis:
|
|---|---|
| A | Does not develop a high voltage with respect to earth |
| B | Does not develop a high voltage with respect to the phase lead |
| C | Becomes a conductor to bleed away static charge |
| D | Provides a path to ground in case of lightning strikes |
| 13 |
The following should always be included as a standard protection device in any power supply:
|
|---|---|
| A | A saturating transformer |
| B | A fuse in the mains lead |
| C | A zener diode bridge limiter |
| D | A fuse in the filter capacitor negative lead |
| 14 |
The value of the fuse :
|
|---|---|
| A | Must correspond to the ampere of the equipment it is protecting |
| B | Any suitable size that can fit in the holder. |
| C | Same as the voltage of the equipment |
| D | Same for all radio communication equipment |
| 15 |
During a thunderstorm an amateur station should:
|
|---|---|
| A | Not be operated |
| B | Be tuned to the international weather warning frequency |
| C | Increase power to overcome lightning static |
| D | Provide weather information |
| 16 |
Antenna erection and rigging should be carried out:
|
|---|---|
| A | By persons with the necessary skills and safety equipment |
| B | By persons with a Amateur Radio Riggers Certificate II or higher |
| C | By persons with a Standard licence or higher |
| D | When three or more people are present one of whom must know CPR |
| 17 |
Cells and batteries contain chemicals that:
|
|---|---|
| A | Are the same as those used in capacitors |
| B | Give off explosive helium gas when they are charged |
| C | Can burn the skin and corrode metals |
| D | Make an inexpensive rust inhibitor |
| 18 |
Antennas and their fittings should:
|
|---|---|
| A | Be higher than 5 metres at the lowest point |
| B | Be made from non-conductive materials |
| C | Be kept well away from power lines |
| D | Never cross buildings inhabited by people |
| 19 |
Radio waves can be dangerous. This danger increases with:
|
|---|---|
| A | Frequency, power and proximity |
| B | Power only |
| C | Power and proximity |
| D | The instantaneous human radiation index |
| 20 |
What is the most serious risk when working inside equipment that uses high voltages?
|
|---|---|
| A | Such equipment is more likely to develop a fault. |
| B | Spare parts are harder to obtain. |
| C | High voltage equipment is more complicated and harder to repair. |
| D | There is a risk of receiving a fatal electric shock. |
| 21 |
You find an amateur friend lying on the floor, silent and apparently not moving, beside his transmitter which has fallen off the desk. Provided it is safe to do so, you should
|
|---|---|
| A | Go for help |
| B | Turn him face up |
| C | Switch off the power |
| D | Pull any microphone and other cables away from him. |
| 22 |
The mains power switch to the radio shack should be
|
|---|---|
| A | Out of reach to younger children for safety reasons |
| B | Key operated to prevent use by non-licensed persons |
| C | Switched off at all times |
| D | In a clearly marked position. |
| 23 |
The purpose of an RF earth is to
|
|---|---|
| A | Pass RF currents safely to earth rather than allowing them to flow into the mains supply |
| B | Ensure the operator is protected from excessive voltages should a piece of equipment suffer a failure |
| C | Allow a balanced antenna to properly function in a balanced mode without causing interference |
| D | Provide a suitable return circuit should a fault develop in the electricity company power supply cables. |
| 24 |
A friend is found in the club workshop slumped over the repair bench and does not respond to being called. As long as you are sure it is safe to do so you should first
|
|---|---|
| A | Switch off the power to the workshop |
| B | Check your friend’s pulse at his wrist or neck |
| C | Shake him gently in case he is simply asleep |
| D | Return to the main room to find a phone |
| 25 |
What kind of amateur station automatically retransmits the signals of other stations?
|
|---|---|
| A | Repeater station |
| B | Space station |
| C | Telecommand station |
| D | Beacon station |
| 26 |
What is the main purpose of a repeater?
|
|---|---|
| A | To link amateur stations with the telephone system |
| B | To increase the range of portable and mobile stations |
| C | To retransmit weather information during severe storm warnings |
| D | To make local information available 24 hours a day |
| 27 |
What is the purpose of a repeater time-out timer?
|
|---|---|
| A | It lets a repeater have a rest period after heavy use |
| B | It logs repeater transmit time to predict when a repeater will fail |
| C | It tells how long someone has been using a repeater |
| D | It limits the amount of time someone can transmit on a repeater |
| 28 |
What is a CTCSS (or PL) tone?
|
|---|---|
| A | A tone used by repeaters to mark the end of a transmission |
| B | A sub-audible tone added to a carrier which may cause a receiver to accept a signal |
| C | A special signal used for telemetry between amateur space stations and Earth stations |
| D | A special signal used for telecommand control of model craft |
| 29 |
FM repeater operation on the 2 metre band uses one frequency for transmission and one for reception. The difference in frequency between the transmit and receive frequency is normally:
|
|---|---|
| A | 800 kHz |
| B | 600 kHz |
| C | 1000 kHz |
| D | 400 kHz |
| 30 |
What is simplex operation?
|
|---|---|
| A | Transmitting and receiving over a wide area |
| B | Transmitting on one frequency and receiving on another |
| C | Transmitting one-way communications |
| D | Transmitting and receiving on the same frequency |
| 31 |
When should you use simplex operation instead of a repeater?
|
|---|---|
| A | When a contact is possible without using a repeater |
| B | When the most reliable communications are needed |
| C | When an emergency telephone call is needed |
| D | When you are traveling and need some local information |
| 32 |
Why should local amateur communications use VHF and UHF frequencies instead of HF frequencies?
|
|---|---|
| A | To minimize interference on HF bands capable of long-distance communication |
| B | Because greater output power is permitted on VHF and UHF |
| C | Because HF transmissions are not propagated locally |
| D | Because signals are louder on VHF and UHF frequencies |
| 33 |
Why should simplex be used where possible, instead of using a repeater?
|
|---|---|
| A | Your antenna’s effectiveness will be better tested |
| B | Long distance toll charges will be avoided |
| C | The repeater will not be tied up unnecessarily |
| D | Signal range will be increased |
| 34 |
If you are talking to a station using a repeater, how would you find out if you could communicate using simplex instead?
|
|---|---|
| A | See if a third station can clearly receive both of you |
| B | See if you can clearly receive a more distant repeater |
| C | See if you can clearly receive the station on the repeater’s input frequency |
| D | See if you can clearly receive the station on a lower frequency band |
| 35 |
What is the correct way to call "CQ" when using voice?
|
|---|---|
| A | Say "CQ" three times, followed by "this is," followed by your call sign spoken three times |
| B | Say "CQ" once, followed by "this is," followed by your call sign spoken three times |
| C | Say "CQ" at least five times, followed by "this is," followed by your call sign spoken once |
| D | Say "CQ" at least ten times, followed by "this is," followed by your call sign spoken on |
| 36 |
What should you do before you transmit on any frequency?
|
|---|---|
| A | Check your antenna for resonance at the selected frequency |
| B | Listen to make sure others are not using the frequency |
| C | Make sure the SWR on your antenna feed line is high enough |
| D | Listen to make sure that someone will be able to hear you |
| 37 |
How can on-the-air interference be minimized during a lengthy transmitter testing or loading-up procedure?
|
|---|---|
| A | Choose an unoccupied frequency |
| B | Use a non-resonant antenna |
| C | Use a resonant antenna that requires no loading-up procedure |
| D | Use a dummy load |
| 38 |
Why would you use a dummy antenna?
|
|---|---|
| A | To give comparative signal reports |
| B | To allow antenna tuning without causing interference |
| C | It is faster to tune |
| D | To reduce output power |
| 39 |
What is the meaning of the procedural signal "CQ"?
|
|---|---|
| A | Calling any station |
| B | Call on the quarter hour |
| C | An antenna is being tested |
| D | Only the station "CQ" should answer |
| 40 |
What is meant by the term "DX"?
|
|---|---|
| A | Calling any station |
| B | Distant station |
| C | Go ahead |
| D | Best regards |
| 41 |
What is the meaning of the term "73"?
|
|---|---|
| A | Long distance |
| B | Love and kisses |
| C | Go ahead |
| D | Best regards |
| 42 |
For best protection from electrical shock, what should be grounded in an amateur station?
|
|---|---|
| A | The antenna feed line |
| B | All station equipment |
| C | The AC power line |
| D | The power supply primary |
| 43 |
To protect you against electrical shock, the chassis of each piece of your station equipment should be connected to:
|
|---|---|
| A | A good ground connection |
| B | A dummy load |
| C | Insulated shock mounts |
| D | The antenna |
| 44 |
Which of these materials is best for a ground rod driven into the earth?
|
|---|---|
| A | Hard plastic |
| B | Iron or steel |
| C | Fiberglass |
| D | Copper-clad steel |
| 45 |
If you ground your station equipment to a ground rod driven into the earth, what is the shortest length the rod should be?
|
|---|---|
| A | 1.25 metre (4 ft) |
| B | 2 metres (6 ft) |
| C | 3.25 metres (10 ft) |
| D | 2.5 metres (8 ft) |
| 46 |
Where should the green wire in a three-wire AC line cord be connected in a power supply?
|
|---|---|
| A | To the white wire |
| B | To the "hot" side of the power switch |
| C | To the chassis |
| D | To the fuse |