(Noob Mode)

110. The PLL acts like a ….., over a narrow range of frequencies.A. Low-pass filterB. Bandpass filterC. Tunable oscillatorD. Frequency multiplier

111. Where is the output of PLL frequency demodulator taken from?A. Low-pass filterB. VCOC. Phase detectorD. Mixer

112. A general term that include frequency and phase modulation.A. Angle ModulationB. Frequency ModulationC. Phase ModulationD. Delta Modulation

113. The ability of an FM receiver to receive the stronger of two signals, ignoring the weaker.

A. Squelch effectB. Capture effectC. Filter effectD. Strainer effect

114. The frequency of a signal before modulation is applied; in contrast to AM signals, the power transmitted at the carrier frequency varies with modulation for an FM signal.

A. Carrier frequencyB. Baseband frequencyC. Intermediate frequencyD. Audio frequency

115. Use of low-pass filter in a receiver to remove the effect of pre-emphasis on the frequency response.

A. Pre-emphasisB. SquelchC. LimiterD. De-emphasis

116. The amount by which the frequency of an FM signal shifts to each side of the carrier frequency.

A. Carrier swingB. Frequency modulationC. Frequency shiftD. Frequency deviation

117. In FM and PM, the peak amount in radians by which the phase of a signal deviates from its resting value.

A. Percent modulationB. Modulation indexC. Carrier swingD. Frequency deviation

118. FM with a relatively low modulation index.A. Wideband FMB. Commercial FMC. Narrowband FMD. Traditional FM

119. Use of a high-pass filter in an FM transmitter to improve the signal-to-noise ratio; always used with de-emphasis at the receiver.

A. CrossoverB. ModemC. LimiterD. Pre-emphasis

120. A secondary carrier that can carry an additional modulating signal and is itself modulated onto the main carrier.

A. Main carrierB. SubcarrierC. Local oscillator frequencyD. All of the above

121. The noise-reduction effect that occurs with strong FM signals.A. Threshold effectB. Filter effectC. Miller effectD. Squelch effect

122. FM with a relatively large modulation index.A. Wideband FMB. Commercial FMC. Narrowband FMD. Traditional FM

123. Extra noise immunity is provided by a pre-emphasis circuit by:A. Boosting the bass frequenciesB. Amplifying the higher audio frequenciesC. Pre-amplifying the whole audio bandD. Increasing the power output of the modulating signal

124. A type of modulation where, when the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant.

A. Amplitude modulation

B. Phase modulationC. Frequency modulationD. All of the above

125. Of the following, which is not an advantage of FM over AM?A. Better noise immunity is providedB. Lower bandwidth is requiredC. The transmitted power is more usefulD. A and B are all disadvantages

126. An indirect way of generating FM is by the use of:A. A reactance FET modulatorB. A varactor diode modulatorC. An Armstrong modulatorD. A phase lock loop

127. Any system that generates FM without using phase modulation.A. Wideband FM B. Narrowband FMC. Indirect FMD. Direct FM

128. Any method that generates FM using a phase modulator and an integrator.

A. Wideband FMB. Narrowband FMC. Indirect FMD. Direct FM

129. Any detector for FM or PM signals.A. DemodulatorB. DiscriminatorC. Phase detectorD. Super heterodyne

130. The strength of an unmodulated carrier that reduces the noise output of an FM receiver by a specified amount.

A. SquelchingB. LimitingC. Quieting sensitivityD. Clamping

131. FM detector that is based on a 90-degree phase-shift network.A. Ratio detectorB. Slope detectorC. Quadratic detectorD. Balance slope detector

132. A type of FM detectorA. Ratio detectorB. Peak envelope detectorC. Quadrature amplitude detectorD. Tuned radio frequency detector