133. In comparing the S/N ratio forthe input to the receiver with the S/N ratio for the output, the latter isA. SmallerB. The sameC. GreaterD. Infinite134. The characteristic of a receiver that specifies the self-generated noise.135. An FM receiver with an I-F of 10.7 MHz is tuned to 98.7 MHz. What is the numerical value of theimage frequency?136. A source of RF interference exists at 109.9 MHz. For which frequency in the FM broadcast band will this be the image frequency?137. The ratio of the superheterodyne receiver response at the desired carrier frequency to that at the image frequency is calledA. The sensitivityB. The selectivityC. The image frequencyD. The image rejection ratio138. The core of an IF transformer usually contains139. Shape factor is a measure of140. _______ is the function whichtends to maintain the sound volume level of a voice receiver nearly constant for a large signal strength range.
141. The function which tends to silence the receiver in the absenceof transmitted carrier.A. SquelchB. MutingC. AGCD. AFC142. What device is incorporated in a communications receiver to reduce impulse noise?143. What type of signal in which a receiver selectivity of 2.4 kHz in the I-F circuitry is optimum?144. If the input to a detector stage is an amplitude-modulated (A3E) IF signal then the output from the stage is145. In a capacitive type, reactance-tube modulator connected across an oscillator tuned circuit, a more negative voltage on the grid of the reactance tube will causeA. An increase of the oscillator frequencyB. An decrease of oscillator frequencyC. An increase of the reactance-tube capacitanceD. An increase of the reactance tube ac plate current146. The limiting condition for sensitivity in a communications receiver is