5 1-38.   Operators of transmitters and receivers use a circuit to coordinate the service of messages and to make frequency changes.  What is the name of this circuit? 1.   Order-wire circuit 2.   Documentation circuit 3.   Synchronization circuit 4.   Operator-eyes-only circuit 1-39.   A transmitted electromagnetic wave enters an antenna, induces a voltage into it, and passes that voltage to a receiver.   What is this chain of events called? 1.   Reproduction 2.   Selection 3.   Detection 4.   Reception 1-40.   When a receiver picks one frequency out from all other frequencies, it's performing which of the following basic functions? 1.   Selection 2.   Reception 3.   Detection 4.   Reproduction 1-41.   When a receiver separates the audio frequencies from the radio-frequency carrier it is performing which of the following basic functions? 1.   Reception 2.   Selection 3.   Detection 4.   Reproduction 1-42.   The receiver action of converting electrical energy to a usable format, such as sound, is an example of which of the following basic functions? 1.   Reception 2.   Selection 3.   Detection 4.   Reproduction 1-43.   Which of the following measurements provides an indication of the ability of a receiver to reproduce weak signals? 1.   Bandwidth 2.   Sensitivity 3.   Selectivity 4.   Frequency response 1-44.   Overall sensitivity of a receiver is limited by which of the following factors? 1.   Noise 2.   Bandwidth 3.   Output power 4.   Frequency response 1-45.   How is a receiver's ability to reject unwanted signals and receive desired signals determined? 1.   Noise 2.   Fidelity 3.   Selectivity 4.   Sensitivity 1-46.   When high fidelity is your prime consideration you should select a receiver that has been designed with which of the following features? 1.   High gain 2.   High output power 3.   Broadband frequency selection circuits 4.   Narrowband frequency selection circuits 1-47.   The IF frequency in a receiver is produced by which of the following methods? 1.   Modulation 2.   Heterodyning 3.   Frequency synthesis 4.   Frequency multiplication