NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 4&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 270029
<ol start = 22>
<br>

<li>  A toroidal inductor is one in which the: 

<ol type = a>

<li> windings are wound on a closed ring of magnetic material 

<li> windings are air-spaced 

<li> windings are wound on a ferrite rod 

<li> inductor is enclosed in a magnetic shield 


</ol>
<br>

<li>  The purpose of using three wires in the mains power 
cord and plug on 
amateur radio equipment is to: 

<ol type = a>

<li> make it inconvenient to use 

<li> prevent the chassis from becoming live in case of an 
internal short to the 
chassis 

<li> prevent the plug from being reversed in the wall outlet 

<li> prevent short circuits 


</ol>
<br>

<li>  The following material is considered to be a 
semiconductor: 

<ol type = a>

<li> copper 

<li> sulphur 

<li> silicon 

<li> tantalum 


</ol>
<br>

<li>  A varactor diode acts like a variable: 

<ol type = a>

<li> resistance 

<li> voltage regulator 

<li> capacitance 

<li> inductance 


</ol>
<br>

<li>  <img src = "mosfet.gif" align = right width = 177 height = 
90> 
<extralines = 1 totallines = 6 >
The figure shown represents a: 

<ol type = a>

<li> dual bipolar transistor 

<li> dual diode 

<li> dual varactor diode 

<li> dual gate MOSFET 


</ol>
<br>

<li>  An ohmmeter measures the: 

<ol type = a>

<li> value of any resistance placed between its terminals 

<li> impedance of any component placed between its 
terminals 

<li> power factor of any inductor or capacitor placed between 
its terminals 

<li> voltage across any resistance placed between its 
terminals 


</ol>
<br>

<li>  The input to an amplifier is 1 volt rms and output 100 volt 
rms. This is an 
increase of: 

<ol type = a>

<li> 10 dB 

<li> 20 dB 

<li> 40 dB 

<li> 100 dB 


</ol>
</ol>
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