NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 10&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 261426
<ol start = 57>
<br>

<li>  Which of the following is most likely to cause broad-band 
continuous 
interference: 

<ol type = a>

<li> an electric blanket switch 

<li> a refrigerator thermostat 

<li> a microwave transmitter 

<li> poor commutation in an electric motor 


</ol>
<br>

<li>  When the signal from a transmitter overloads the audio 
stages of a 
broadcast receiver, the transmitted signal: 

<ol type = a>

<li> can be heard irrespective of where the receiver is tuned 

<li> appears only when a broadcast station is received 

<li> is distorted on voice peaks 

<li> appears on only one frequency 


</ol>
<br>

<li>  The voltage gain of an operational amplifier at low 
frequencies is: 

<ol type = a>

<li> very high but purposely reduced using circuit components 

<li> very low but purposely increased using circuit 
components 

<li> less than one 

<li> undefined 


</ol>
<br>

<li>  "ITA2" is: 

<ol type = a>

<li> a 5 bit alphabet used for digital communications 

<li> Morse code sent such that the baud speed is equal to 
the dot speed 

<li> a coding system identifying modulation types 

<li> an error correction code 


</ol>
</ol>