22 Figure 3C.—Detector. IN ANSWERING QUESTIONS 3-14 THROUGH 3-16, REFER TO FIGURE 3C. 3-14.   What type of detector is shown in the figure? 1.  Series-diode 2.  Parallel-diode 3.  Inductive-diode 4.  Capacitive-diode 3-15.   What is the purpose of C1 and L? 1.  To smooth the incoming rf 2.  To select the desired af signal 3.  To select the desired rf signal 4.  To smooth the detected af signal 3-16.   What is the purpose of C2? 1.  To smooth the incoming rf signal 2.  To select the desired af signal 3.  To select the desired rf signal 4.  To smooth the detected af signal 3-17.   A shunt diode circuit is used as a detector in which of the following instances? 1.  When a large input signal is supplied 2.  When a large output current is required 3.  When the input signal variations overdrive the audio amplifier stages 4.  When the input signal variations are too small to produce a full output from audio amplifier stages Figure 3D.—Detector. IN ANSWERING QUESTIONS 3-18 THROUGH 3-21, REFER TO FIGURE 3D. 3-18.   What type of detector is shown in the figure? 1.  Ratio 2.  Common-base 3.  Regenerative 4.  Common-emitter 3-19.   What circuit component acts as the load for the detected audio? 1. R1 2. R2 3. R3 4. R4 3-20.   What is the purpose of C4? 1.  Tp bypass af 2.  To bypass rf 3.  To remove power supply voltage variations 4.  To determine the operating frequency of the circuit 3-21.   This detector circuit is used under which of the following circuit conditions? 1.  When higher frequencies are used 2.  When the best possible frequency selection is required 3.  When weak signals need to be detected 4.  When strong signals need to be detected