# Amateur Radio Examination EXAMINATION PAPER No. 272 CANDIDATE S COPY

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2 09-8 When the Amateur Service is a secondary user of a band and another service is the primary user, this means: a nothing at all, because all services have equal rights to operate b amateurs may only use the band during declared emergencies c the band may be used by amateurs provided harmful interference is not caused to other services d you may increase transmitter power to overcome any interference 10-8 The term describing opposition to electron flow in a circuit is: a current b voltage c power d resistance 11-6 An electrical insulator: a lets electricity flow through it in one direction b lets electricity flow through it c lets electricity flow through it when light shines on it d does not let electricity flow through it 12-6 The unit for the potential difference between two points in a circuit is the: a ampere b ohm c volt d coulomb 13-1 A current of 10 ma is measured in a 500 ohm resistor. The voltage across the resistor will be: a 50 volt b 5 volt c 500 volt d 5000 volt 14-1 A circuit has a total resistance of 100 ohm and 50 volt is applied across it. The current flow will be: a 500 ma b 50 ma c 2 ampere d 20 ampere 15-0 The total resistance in a parallel circuit: a depends upon the voltage drop across each branch b could be equal to the resistance of one branch c is always less than the smallest branch resistance d depends upon the applied voltage 16-9 The following resistor combination can most nearly replace a single 150 ohm resistor: a three 47 ohm resistors in series b four 47 ohm resistors in parallel c five 33 ohm resistors in parallel d five 33 ohm resistors in series 2

3 17-7 Two 33 ohm resistors are connected in series with a power supply. If the current flowing is 100 ma, the voltage across one of the resistors is: a 3.3 volt b 66 volt c 33 volt d 1 volt 18-5 A current of 500 milliamp passes through a 1000 ohm resistance. The power dissipated is: a 250 watt b 0.25 watt c 2.5 watt d 25 watt 19-1 The following two electrical units multiplied together give the unit "watt": a volt and farad b volt and ampere c farad and henry d ampere and henry 20-3 The current in an AC circuit completes a cycle in 0.1 second. So the frequency is: a 1 Hz b 1000 Hz c 100 Hz d 10 Hz 21-5 Three 15 picofarad capacitors are wired in parallel. The value of the combination is: a 18 picofarad b 12 picofarad c 5 picofarad d 45 picofarad 22-8 An inductor and a capacitor form a resonant circuit. If the value of the inductor is decreased by a factor of four, the resonant frequency will: a increase by a factor of two b increase by a factor of four c decrease by a factor of two d decrease by a factor of four 23-0 You can safely remove an unconscious person from contact with a high voltage source by: a pulling an arm or a leg b turning off the high voltage and then removing the person c wrapping the person in a blanket and pulling to a safe area d calling an electrician 24-5 A low-level signal is applied to a transistor circuit input and a higher-level signal is present at the output. This effect is known as: a detection b modulation c amplification d rectification 3

7 49-4 A switching system to use a single antenna for a separate transmitter and receiver should also: a disconnect the antenna tuner b ground the antenna on receive c disable the unit not being used d switch between power supplies 50-9 Radio wave polarisation is defined by the orientation of the radiated: a electric field b magnetic field c inductive field d capacitive field 51-8 A dummy antenna: a attenuates a signal generator to a desirable level b provides more selectivity when a transmitter is being tuned c duplicates the characteristics of an antenna without radiating signals d matches an AF generator to the receiver 52-4 Insulators are used at the end of suspended antenna wires to: a increase the effective antenna length b make the antenna look more attractive c prevent any loss of radio waves by the antenna d limit the electrical length of the antenna 53-2 An antenna type commonly used on HF is the: a parabolic dish b 13-element Yagi c helical Yagi d cubical quad 54-2 The highest frequency that will be reflected back to the earth at any given time is known as the: a UHF b OWF c MUF d LUF 55-5 Propagation on 80 metres during the summer daylight hours is limited to relatively short distances because of: a the disappearance of the E layer b high absorption in the D layer c poor refraction by the F layer d pollution in the T layer 56-4 The type of atmospheric layers which will best return signals to earth are: a oxidised layers b heavy cloud layers c sun spot layers d ionised layers 7

8 57-7 When living in a densely-populated area, it is wise to: a use the minimum transmitter output power necessary b always use maximum transmitter output power c only transmit during popular television programme times d point the beam at the maximum number of television antennas 58-7 A band-stop filter will: a stop frequencies each side of a band b pass frequencies each side of a band c only allow one spot frequency through d pass frequencies below 100 MHz 59-3 A high-pass RF filter would normally be fitted: a at the antenna terminals of a TV receiver b between transmitter output and feedline c at the Morse key or keying relay in a transmitter d between microphone and speech amplifier 60-3 The following are three digital communication modes: a DSBSC, PACTOR, NBFM b AMTOR, PACTOR, PSK31 c AGC, FSK, Clover d PSK31, AFC, PSSN 8

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