Practise multiple-choice questions

 

Sample examination 1, paper 2

        Operating practices, procedures and theory

 

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1.   Having established contact on a calling frequency it is good practice to:

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2.   The purpose of a terrestrial repeater is to

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3.   The Q-code for 'standby' is:

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4.   COIL using the phonetic alphabet would be:

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5.   The Band Plans should be observed because:

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6.   It is good safety practice to:

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7.   When calling a station it is good practice to:

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8.   In the RST code T is for:

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9.   To prevent annoying other users on a band, a transmitter should always be tuned initially:

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10.   Two 10kW resistors are connected in parallel across a 5V DC supply. The total current taken is:

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11.   The diagram represents a trace on an oscilloscope. What is the frequency of the displayed waveform?

           

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12.   In the diagram in question 11, what is the peak to peak value of the waveform?

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13.   As the frequency rises, the reactance of an inductor:

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14.   The resonant frequency of the  circuit is:

            

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15.   A power gain of 4 is equivalent to:

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16.   Which of the following represents the diode in a conducting condition?

              

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17.   If the base potential of an NPN transistor is held at the emitter potential, the collector current will be:

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18.   The output impedance of an emitter-follower buffer amplifier is:

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19.   The circuit shown below depicts:

               

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20.   The circuit in question 19 operates in:

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21.   Integrated circuits that performs logic functions with binary signals are classified as:

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22. The trace shown below is from a power supply. The ripple is:  

           

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23.     The frequency difference between the wanted RF signal and the so-called second channel is: 

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24.    In a direct-conversion receiver, the local oscillator is:  

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25.     The squelch in a receiver is operated by: 

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26.    The effect of the AGC on receipt of a very strong incoming signal is to: 

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27.    A high first IF allows easier filtering to prevent:  

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28.    The principal outputs from the following circuit are:

             

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29.    In order to demodulate CW transmissions in an AM-only receiver, which of the following is required?  

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30.    The coil determining the frequency of a transmitter VFO should be:

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31.    To produce double sideband, suppressed carrier signal, which of the following should be used? 

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32.     The following represents a CW transmitter. Ideally, keying should be applied at: 

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33.    The output power from an FM transmitter:  

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34.    The output amplifier of an SSB transmitter must:  

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35. In the following circuit arrangement, to give an output of 145.000MHz, the crystal oscillator is at: 

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36.    If a transmitter output impedance is 50W, for optimum power transfer the load should be:  

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37.    The RF spectrum required to transmit an SSB signal is:  

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38.    The wavelength of a signal of 100MHz in free space is:.  

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39.    In order to radiate, an electromagnetic wave must have:  

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40.    Polarisation of an electromagnetic wave is fixed by:.  

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41.    The signals returned from the layers above the earth are referred to as:  

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42.    As frequency increases, the ionisation to reflect a signal back to the earth must:.  

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43.    Fading can be caused by:.  

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44.   A transmission line is said to be perfectly matched when it is terminated by a resistance equal to:  

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45.    The following antenna represents:

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46.    The addition of reflectors and a director to a folded dipole:.  

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47.    The typical accuracy of a moving coil meter is:.  

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48.    A dummy load for use at VHF should be made from:.  

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49.   To measure DC input power to a final amplifier, various meters are used. Those necessary are:

           

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50.     The action of the so-called 'dip oscillator' depends on: 

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51. The following represents the output of a digital frequency counter. What does the digit at X signify? 

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52.   The coaxial cable from an SWR meter to an antenna develops a fault so that so that no power reaches the antenna the SWR meter will read:  

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53.    Which of the following would be used to examine the shape of a waveform?  

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54.    For accurate frequency measurement, which of the following instruments would be used?.  

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55.   When measuring frequency in the above equipment, the probe should preferably be placed at:

           

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