NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 3&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 261426
<ol start = 15>
<br>

<li>  A dry cell has an open circuit voltage of 1.5 volt. When 
supplying a large 
current the voltage drops to 1.2 volt. This is due to the cell's: 

<ol type = a>

<li> internal resistance 

<li> voltage capacity 

<li> electrolyte becoming dry 

<li> current capacity 


</ol>
<br>

<li>  A 6 ohm resistor is connected in parallel with a 30 ohm 
resistor. The total 
resistance of the combination is: 

<ol type = a>

<li> 5 ohm 

<li> 8 ohm 

<li> 24 ohm 

<li> 35 ohm 


</ol>
<br>

<li>  Two resistors are in parallel. Resistor A carries twice the 
current of resistor B 
which means that: 

<ol type = a>

<li> A has half the resistance of B 

<li> B has half the resistance of A 

<li> the voltage across A is twice that across B 

<li> the voltage across B is twice that across B 


</ol>
<br>

<li>  A current of 500 milliamp passes through a 1000 ohm 
resistance. The power 
dissipated is: 

<ol type = a>

<li> 0.25 watt 

<li> 2.5 watt 

<li> 25 watt 

<li> 250 watt 


</ol>
<br>

<li>  Each of 9 resistors in a circuit is dissipating 4 watt. If the 
circuit operates 
from a 12 volt supply, the total current flowing in the circuit is: 

<ol type = a>

<li> 48 ampere 

<li> 36 ampere 

<li> 9 ampere 

<li> 3 ampere 


</ol>
<br>

<li>  An impure signal is found to have 2 kHz and 4 kHz 
components. This 4 kHz 
signal is: 

<ol type = a>

<li> a fundamental of the 2 kHz signal 

<li> a sub-harmonic of 2 kHz 

<li> the DC component of the main signal 

<li> a harmonic of the 2 kHz signal


</ol>
<br>

<li>  Three 15 picofarad capacitors are wired in parallel. The 
value of the 
combination is: 

<ol type = a>

<li> 45 picofarad 

<li> 18 picofarad 

<li> 12 picofarad 

<li> 5 picofarad 


</ol>
</ol>
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