Questions From the Industry Canada Basic Question Bank

 (To Assist in Learning Vocabulary and Terminology)

Part B

of A to C

In designing an HF station, which component would you use to reduce the effects of harmonic radiation?

* Low pass filter

Which component in an HF station is the most useful for determining the effectiveness of the antenna system?

* SWR bridge

Of the components in an HF station, which component would be used to match impedances between the transceiver and antenna?

* Antenna tuner

In an HF station, which component is temporarily connected in the tuning process?

* Dummy load

In a frequency modulation transmitter, the input to the speech

amplifier is connected to the:

* microphone

In a frequency modulation transmitter, the microphone is connected to the:

* speech amplifier

In a frequency modulation receiver, the _________ is located between the speaker and/or headphones and the frequency discriminator.

* audio frequency amplifier

In a frequency modulation receiver, the __________ connects to the audio frequency amplifier output

* speaker and/or headphones

In a typical CW transmitter, the ___________ is the primary source of direct current.

* power supply

In a CW transmitter, the ______________ is in between the driver/buffer stage and the antenna.

* power amplifier

In a CW transmitter, the output of the _____________ is transferred to the antenna.

* power amplifier

In a single sideband and CW receiver, the antenna is connected to the ____________ .

* radio frequency amplifier

In a single sideband and CW receiver, the __________ is connected to the output of the audio frequency amplifier.

* speaker and/or headphones

In a single sideband transmitter, the ______________ is connected to the speech amplifier.

* microphone

In a single sideband transmitter, the output of the linear amplifier is connected to the ______________.

* antenna

In a digital system, the modem is connected to the ________.

* computer

In a regulated power supply, the _______________ is between the input and the rectifier.

* transformer

In a Yagi-Uda 3 element directional antenna, the ________ is the

longest radiating element.

* reflector

What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?

* A notch filter

A mismatched antenna or feedline may present an incorrect load to the transmitter. The result may be:

* excessive heat produced in the final transmitter stage

One result of a slight mismatch between the power amplifier of a

transmitter and the antenna would be:

* reduced antenna radiation

In a SSB transmission, the carrier is:

* reinserted at the receiver

What may your FM hand-held or mobile transceiver do if you shout into its microphone?

* It may cause interference to other stations operating near its Frequency

What can you do if you are told your FM hand-held or mobile transceiver is overdeviating?

* Talk farther away from the microphone

Why is FM voice best for local VHF/UHF radio communications?

* It has high-fidelity audio which can be understood even when the signal is somewhat weak

FM receivers perform in an unusual manner when two or more stations are present. The loudest signal, even though it is only two or three times as loud as the other signals, will be the only transmission demodulated. This is called:

* capture effect

Where would you connect a microphone for voice operation?

* To a transceiver

What would you connect to a transceiver for voice operation?

* A microphone

Why might a dummy antenna get warm when in use?

* Because it changes RF energy into heat

What is a digipeater?

* A packet-radio station that retransmits only data that is marked to be retransmitted

How much voltage does a standard automobile battery usually supply ?

* About 12 volts

Which component has a positive and a negative side?

* A battery

To increase the voltage output, several cells are connected in:

* series

A nickel-cadmium battery should never be:

* short-circuited

If your mobile transceiver works in your car but not in your home, what should you check first?

* The power supply

What device converts household current to 12 VDC?

* A power supply

Power-line voltages have been made standard over the years and the voltages generally supplied to homes are approximately:

* 120 and 240 volts

You have a very loud low- frequency hum appearing on your transmission. In what part of the transmitter would you first look for the trouble?

* the power supply

Which body organ can be fatally affected by a very small amount of electrical current?

* The heart

What should you do if you discover someone who is being burned by high voltage?

* Turn off the power, call for emergency help and give CPR if

Needed

What is the safest method to remove an unconscious person from contact with a high voltage source?

* Turn off the high voltage switch before removing the person from contact with the source

Fault finding in a power supply of an amateur transmitter while the supply is operating is not a recommended technique because of the risk of:

* electric shock

For best protection from electrical shock, what should be grounded in an amateur station?

* All station equipment

If a separate ground system is not possible for your amateur station, an alternative indoor grounding point could be:

* a metallic cold water pipe

To protect you against electrical shock, the chassis of each piece of your station equipment should be connected to:

* a good ground connection

The purpose of using a three- wire power cord and plug on amateur radio equipment is to:

* prevent the chassis from becoming live in case of an internal short to the chassis

Why should you ground all antenna and rotator cables when your amateur station is not in use?

* To protect the station and building from lightning damage

How can an antenna system be protected from lightning damage?

* Ground all antennas when they are not in use

Why should your outside antennas be high enough so that no one can touch them while you are transmitting?

* Touching the antenna might cause RF burns

Why should you make sure that no one can touch an open-wire feed line while you are transmitting with it?

* Because high-voltage radio energy might burn the person

Why should you make sure the antenna of a hand-held transceiver is not close to your head when transmitting?

* To reduce your exposure to the radio-frequency energy

How should you position the antenna of a hand-held transceiver while you are transmitting?

* Away from your head and away from others

How can exposure to a large amount of RF energy affect body tissue?

* It heats the tissue

Which body organ is the most likely to be damaged from the heating effects of RF radiation

* Eyes

A circuit designed to increase the level of its input signal is called:

* an amplifier

To increase the level of very weak radio signals from an antenna, you would use:

* an RF amplifier

To increase the level of very weak signals from a microphone you would use:

* an audio amplifier

The increase in signal level by an amplifier is called:

* gain

A device with gain has the property of:

* amplification

The action of changing alternating current to direct current is called:

* rectification

What semi-conductor device glows red, yellow, or green, depending upon its chemical composition?

* A light-emitting diode

Which component can amplify a small signal using low voltages?

* A PNP transistor

The basic semi-conductor amplifying device is the:

* transistor

If a low level signal is placed at the input to a transistor, a higher level of signal is produced at the output lead. This effect is know as:

* amplification

A transistor can be destroyed in a circuit by:

* excessive heat

The two basic types of field effect transistors (FET) are:

* N and P channel

A feature common to tubes and transistors is that both:

* can amplify signals

What is inside the envelope of a triode tube?

* a vacuum

What are the possible values of a 100 ohm resistor with a 10%

tolerance?

* 90 to 110 ohms

A kilohm is:

* 4. 1000 ohms

6.6 kilovolts is equal to:

* 6600 volts

One megahertz is equal to:

* 1 000 kHz