65051. In a Hartley oscillator, the elements X1 and X2 are ________ and X3 is a(n) ________.
65052. A feedback amplifier has a ________ upper 3-dB frequency and a ________ lower 3-dB frequency compared to an amplifier without feedback.
65053. What is the gain at the origin of the Nyquist plot?
65054. Positive feedback results in ________.
65055. In the Wien bridge oscillator with R1 = R2 = R and C1 = C2 = C, a ratio of R3 to R4 will provide sufficient loop gain for the circuit to oscillate.
65056. In the phase-shift oscillator, the operating frequency is determined by ________.
65057. In the Barkhausen criterion, the loop gain A is equal to ________.
65058. Negative feedback results in ________.
65059. With feedback, , the overall gain of the circuit is reduced by a factor ________ where A is the gain without the feedback.
65060. Series-feedback connections tend to ________ the input resistance. Shunt feedback connections tend to ________ the input resistance.
65061. In practice, A is made ________ and the system is started oscillating by amplifying noise voltage, which is always present.
65062. Voltage feedback connections tend to ________ the output impedance. Current feedback connections tend to ________ the output impedance.
65063. In the phase-shift oscillator, the gain of the amplifier stage must be ________.
65064. The series-resonant impedance of a crystal oscillator is ________.
65065. An amplifier with negative feedback has ________ bandwidth than (as) the amplifier without feedback.
65066. The parallel-resonant impedance of a crystal oscillator is ________.
65067. In a Nyquist plot, as the frequency increases, the phase shift between input and output signals ________.
65068. At the series-resonant frequency, the amount of positive feedback is ________.
65069. Since the crystal losses represented by R are small, the equivalent crystal Q (quality factor) is ________.
65070. In the Colpitts oscillator, the frequency is determined by ________ .
65071. Typically, a unijunction transistor has a stand-off ratio from ________ to ________.
65072. Crystal oscillators are used whenever a(n) ________ level of stability is required.
65073. The feedback network in a Colpitts oscillator contains two series capacitors and a parallel inductor.
65074. The positive feedback voltage in an oscillator has no net phase shift.
65075. Crystal oscillators are inherently unstable.
65076. For a Wien-bridge oscillator, resonance occurs when Vout/Vin = 1.
65077. LC feedback elements are normally used in oscillators for frequencies greater than 1 MHz.
65078. The frequency in a VCO can be varied with a DC voltage.
65079. Oscillators operate on negative feedback.
65080. The start-up gain of an oscillator must be greater than 1.
65081. The feedback signal in a Hartley oscillator is derived from an inductive voltage in the tank circuit.
65082. In the astable mode, a 555 timer is connected as a free-running relaxation oscillator.
65083. Calculate the value of C1 = C2 for the Wien bridge oscillator to operate at a frequency of 20 kHz. Assume R1 = R2 = 50 k and R3 = 3R4 = 600?
65084. Only the condition A = ________ must be satisfied for self-sustained oscillations to result.
65085. At what phase shift is the magnitude of A at its maximum in the Nyquist plot?
65086. How many terminals does a programmable unijunction transistor (PUT) have?
65087. What is the typical value of the reverse resistance of SCRs?
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