SOLVED

Multiple Choice Questions 1.A receiver’s ________ is the minimum input signal, expressed as a voltage, required to producea specified output. A. selectivity B. intelligenceC. sensitivity D. amplification 2.Why is amplification with an antenna? A. Low noise B. Small signal C. Small bandwidth D. Variable-selectivity problems 3.What is the key to thesuperior selectivity of the superheterodyne receiver? A. Constant bandwidth B. Low frequencies C. Image frequency D. Intelligencedetection 4._______________is the process of stepping down the RF signal to a first, relativelyhigh IF frequency and then mixing down again to a second, lower, final IF frequency. A.Deemphasising B. Double conversion C. Up-conversion D. Suppression 5.A receiver’s _________ is the extent to which a receiver is capable of differentiating between the desired signal and unwanted radio signals and noise. A.sensitivity B.bandwidth C.tuning range D.selectivity 6.Which of the following is responsible for the image frequency rejection characteristics of the receiver? A.Auxiliary AGC diode B.Automatic frequency control (AFC) C. Preselector D. Discriminator 7.A __________ function in an FM receiver is to remove any residual amplitude modulation and the amplitude variations resulting from noise. A. limiter B. discrete analog component C.local oscillator D.discriminator 8.What is one advantage of the direct-conversion architecture? A. Superior intermodulationperformance B. Simplicity C. Superior cross-modulation D. Fully implemented withdiscrete components 9.What is the purpose of the detector? A.To recover the low-frequency intelligence or baseband signalfrom the much higher intermediate- or radio-frequency carrier. B.To remove any residual amplitude modulation and the amplitude variations resulting from noise. C.To make an economical LCoscillator at 100 MHz with sufficient frequency stability. D.Torecreate the carrier. 10.The ___________of an amplifier or receiver is the input power range over which itprovides a useful output. A. simple automatic gain control (AGC) B.quadrature detector C. Foster–Seeley discriminator circuit D. dynamic range 1