Amateur Radio Examination EXAMINATION PAPER No. 275 MARKER S COPY

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2 08-0-(d) Amateur stations are often described as being "frequency agile". This means: a operation is restricted to frequency modulation only b operators can operate anywhere on a shared band c a bandswitch is required on all transmitters d operators can change frequency on a shared band to avoid interfering 09-6-(d) The New Zealand amateur radio bandplans are: a obligatory for all amateur radio operators b only for testing and development purposes c indicators of where distant stations can be worked d recommended, all amateur radio operators should observe them 10-8-(d) The term describing opposition to electron flow in a circuit is: a current b voltage c power d resistance 11-7-(a) Four good electrical insulators are: a glass, air, plastic, porcelain b plastic, rubber, wood, carbon c glass, wood, copper, porcelain d paper, glass, air, aluminium 12-5-(a) The voltage "two volts" is also: a 2,000 mv b 2,000 kv c 2,000 uv d 2,000 MV 13-4-(c) The voltage to cause a current of 4.4 ampere to flow in a 50 ohm resistance is: a 2220 volt b 22.0 volt c 220 volt d volt 14-3-(b) A resistor with 10 volt applied across it and passing a current of 1 ma has a value of: a 10 ohm b 10 kilohm c 100 ohm d 1 kilohm 2

3 15-8-(c) Two resistors are connected in parallel. One is 75 ohm and the other is 50 ohm. The total resistance of this parallel circuit is: a 10 ohm b 70 ohm c 30 ohm d 40 ohm 16-0-(d) A 6 ohm resistor is connected in parallel with a 30 ohm resistor. The total resistance of the combination is: a 8 ohm b 24 ohm c 35 ohm d 5 ohm 17-1-(b) Two resistors are in parallel. Resistor A carries twice the current of resistor B, which means that: a B has half the resistance of A b A has half the resistance of B c the voltage across A is twice that across B d the voltage across B is twice that across B 18-3-(b) When two 1000 ohm 5 watt resistors are connected in parallel, they can dissipate a maximum total power of: a 40 watt b 10 watt c 20 watt d 5 watt 19-3-(a) If two 10 ohm resistors are connected in series with a 10 volt battery, the battery load is: a 5 watt b 10 watt c 20 watt d 100 watt 20-8-(a) The "rms voltage" of a sinewave signal is: a times the peak voltage b half the peak voltage c times the peak voltage d the peak-to-peak voltage 21-3-(c) Two metal plates separated by air form a uf capacitor. Its value may be changed to uf by: a making the plates smaller in size b moving the plates apart c bringing the metal plates closer together d touching the two plates together 3

4 22-1-(c) Two 20 uh inductances are connected in series. The total inductance is: a 10 uh b 20 uh c 40 uh d 80 uh 23-8-(b) The correct colour coding for the earth wire in a flexible mains lead is: a brown b yellow and green c blue d white 24-4-(a) The three leads from a PNP transistor are named the: a collector, emitter, base b collector, source, drain c gate, source, drain d drain, base, source 25-0-(b) A varactor diode acts like a variable: a resistance b capacitance c voltage regulator d inductance 26-2-(c) This semiconductor device has characteristics most similar to a triode valve: a junction diode b zener diode c field effect transistor d bipolar transistor 27-3-(d) The following meter could be used to measure the power supply current drawn by a small hand-held transistorised receiver: a a power meter b an RF ammeter c an electrostatic voltmeter d a DC ammeter 28-0-(b) Assuming the same impedances, the input to an amplifier is 1 volt rms and the output 10 volt rms. This is an increase of: a 3 db b 20 db c 6 db d 10 db 4

6 36-5-(b) Front-end selectivity is provided by resonant networks both before and after the RF stage in a superhet receiver. This whole section of the receiver is often referred to as the: a preamble b preselector c preamplifier d pass-selector 37-1-(a) In a frequency modulation transmitter, the microphone is connected to the: a speech amplifier b modulator c power amplifier d oscillator 38-9-(b) In an single sideband transmitter, this is located between the mixer and the antenna: a variable frequency oscillator b linear amplifier c balanced modulator d radio frequency oscillator 39-6-(c) The difference between DC input power and RF power output of a transmitter RF amplifier: a radiates from the antenna b is lost in the feedline c is dissipated as heat d is due to oscillating current 40-7-(a) Harmonic frequencies are: a at multiples of the fundamental frequency b always lower in frequency than the fundamental frequency c any unwanted frequency above the fundamental frequency d any frequency causing TVI 41-0-(d) Harmonics are to be avoided because they: a cause damage to amateur equipment b make your signal unreadable at other stations on that band c cause possible interference to other users of that band d cause possible interference to services using other bands 42-5-(b) The capacitor value best suited for filtering the output of a 12 volt 1 amp DC power supply is: a 100 pf b 10,000 uf c 10 nf d 100 nf 6

7 43-0-(d) A filter is used in a power supply to: a filter RF radiation from the output of the power supply b restore voltage variations c act as a 50 Hz tuned circuit d smooth the rectified waveform from the rectifier 44-7-(a) When conversing via a VHF or UHF repeater, you should pause between overs for about: a 3 seconds b half a second c 30 seconds d several minutes 45-4-(d) The standard frequency offset (split) for 2 metre repeaters in New Zealand is: a plus 600 khz below 147 MHz, minus 600 khz on or above 147 MHz b minus 5 MHz below 147 MHz, plus 5 MHz khz on or above 147 MHz c plus 5 MHz below 147 MHz, minus 5 MHz khz on or above 147 MHz d plus 600 khz above 147 MHz, minus 600 khz on or below 147 MHz 46-8-(c) Many receivers have both RF and AF gain controls. These allow the operator to: a vary the receiver frequency and AM transmitter frequency independently b vary the low and high frequency audio gain independently c vary the gain of the radio frequency and audio frequency amplifier stages independently d vary the receiver's "real" and "absolute" frequencies independently 47-4-(c) The "Q" signal "what is your location?" is: a QRZ? b QTC? c QTH? d QRL? 48-7-(b) An RF transmission line should be matched at the transmitter end to: a prevent frequency drift b transfer maximum power to the antenna c overcome fading of the transmitted signal d ensure that the radiated signal has the intended polarisation 49-5-(b) An instrument to check whether RF power in the transmission line is transferred to the antenna is: a an antenna tuner b a standing wave ratio meter c a dummy load d a keying monitor 7

8 50-9-(a) Radio wave polarisation is defined by the orientation of the radiated: a electric field b magnetic field c inductive field d capacitive field 51-9-(b) A half-wave antenna resonant at 7100 khz is approximately this long: a 40 metres b 20 metres c 80 metres d 160 metres 52-1-(a) A half-wave antenna cut for 7 MHz can be used on this band without change: a 15 metre b 10 metre c 20 metre d 80 metre 53-4-(c) The maximum radiation from a three element Yagi antenna is: a in the direction of the reflector end of the boom b at right angles to the boom c in the direction of the director end of the boom d parallel to the line of the coaxial feeder 54-5-(a) That portion of HF radiation which is directly affected by the surface of the earth is called: a ground wave b local field wave c inverted wave d ionospheric wave 55-7-(a) A variation in received signal strength caused by slowly changing differences in path lengths is called: a fading b absorption c fluctuation d path loss 56-7-(b) VHF or UHF signals transmitted towards a tall building are often received at a more distant point in another direction because: a these waves are easily bent by the ionosphere b these waves are easily reflected by objects in their path c you can never tell in which direction a wave is travelling d tall buildings have elevators 8

9 57-1-(b) On an amateur receiver, unwanted signals are found at every khz. This is probably due to: a a low-frequency government station b radiation from a nearby TV line oscillator c a remote radar station d none of these 58-6-(c) A band-pass filter will: a pass frequencies each side of a band b attenuate low frequencies but not high frequencies c attenuate frequencies each side of a band d attenuate high frequencies but not low frequencies 59-1-(b) Television interference caused by harmonics radiated from an amateur transmitter could be eliminated by fitting: a a low-pass filter in the TV receiver antenna input b a low-pass filter in the transmitter output c a high-pass filter in the transmitter output d a band-pass filter to the speech amplifier 60-0-(d) A "modem" is a: a modulation de-emphasis unit b Morse demodulator c MOSFET de-emphasis unit d modulator/demodulator 9

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