Description : What term is used to describe the frequency at which the filter circuit changes from the point of rejecting the unwanted frequencies to the point of passing the desired frequencies?
Last Answer : Frequency cutoff (fco).
Description : The modulator is required to be what kind of a circuit stage in a plate modulator?
Last Answer : Power amplifier
Description : In a bistable multivibrator, how many trigger pulses are needed to produce one complete cycle in the output?
Last Answer : Two.
Description : What is needed to use a monostable or one-shot multivibrator for a clock circuit?
Last Answer : Triggers.
Description : For what class of operation is the final rf power amplifier of a plate-modulator circuit biased?
Last Answer : Class C
Description : The voltage at the reference electrode of the circuit shown in the illustration is applied to the input of a/an ______________. EL-0090 A. class A detector whose output drives an ... drives an 2-stage isolation transformer D. magnetic amplifier whose output controls a saturable reactor
Last Answer : Answer: D
Description : What do you call a circuit that controls the magnetron output? A. Inverter B. Impeller C. Modulator D. Converter
Last Answer : C. Modulator
Description : What is another name for the monostable multivibrator?
Last Answer : One-shot.
Description : In an astable multivibrator, which components determine the pulse repetition frequency?
Last Answer : RC coupling networks.
Description : What type of multivibrator has two stable states?
Last Answer : Bistable.
Description : What type of multivibrator does not have a stable state?
Last Answer : Astable.
Description : What type of multivibrator can be used as a radar master oscillator?
Last Answer : Free-running.
Description : What type filter is used to allow a narrow band of frequencies to pass through a circuit and attenuate all other frequencies above or below the desired band?
Last Answer : Bandpass.
Description : What is the band of frequencies called that is included between the two points at which current falls to 70 percent of its maximum value in a resonant circuit?
Last Answer : Bandwidth of the circuit
Description : What is the purpose of a modulator in a servo system?
Last Answer : To convert a dc error signal into an ac error signal.
Description : What modulator element controls the rate at which the storage element charges?
Last Answer : The charging impedance.
Description : What type of tube best meets the requirements of a modulator switching element?
Last Answer : Thyratron.
Description : What type of modulator is most commonly used in modern radar systems?
Last Answer : Line-pulsed.
Description : In addition to a flat top, what characteristics must a modulator pulse have?
Last Answer : Steep leading and trailing edges.
Description : What components may be used to build a basic phase modulator?
Last Answer : A phase-shift network such as a variable resistor and capacitor in series
Description : What characteristic of a varactor is used in an fm modulator?
Last Answer : Capacitance.
Description : What characteristic of a transistor is varied in a semiconductor-reactance modulator?
Last Answer : Collector-to-emitter capacitance.
Description : How does the reactance-tube modulator impress intelligence onto an rf carrier?
Last Answer : By changing the reactance of an oscillator circuit in consonance with the modulating voltage.
Description : What are the basic components of a thyratron modulator?
Last Answer : ower source, a circuit for storing energy, a circuit for discharging the storage circuit, and a pulse transformer.
Description : What is the primary component for a spark-gap modulator?
Last Answer : Either a fixed spark gap that uses a trigger pulse to ionize the air between the contacts, or a rotary gap that is similar to a mechanical switch.
Description : What causes the change in collector current in an emitter injection modulator?
Last Answer : Gain is varied by changing the voltage on the emitter.
Description : What type of modulator is the cathode modulator (low- or high-level)?
Last Answer : Low-level.
Description : When is a control-grid modulator used?
Last Answer : In cases when the use of a minimum of af modulator power is desired.
Description : The collector-injection modulator is similar to what type of tube modulator?
Last Answer : Plate modulator.
Description : How much must the fpa plate current vary to produce 100- percent modulation in a plate modulator?
Last Answer : Between 0 and nearly two times its unmodulated value.
Description : The circuit shown in the illustration functions as a ____________. EL-0087 A. pulse trigger circuit for an operational amplifier B. three stage, high gain class 'A' amplifier C. binary ripple counter or shift register D. free running multivibrator
Last Answer : Answer: C
Description : Define Multivibrator. State the types of multivibrator. Which M/V can be used as a flip-flop? Draw the circuit diagram.
Last Answer : Definition:- A multivibrator is an electronic circuit that switches rapidly by means of positive feedback between two or more states. OR A multivibrator is an electronic circuit used to implement a ... Bistable Multivibrator: it can operate as a flip-flop, Circuit diagram
Description : circuit diagram of Astable Multivibrator with any two application.
Last Answer : Applications of Astable Multivibrator 1. It is used in square wave generator. 2. It is used for voltage to frequency converters. 3. In ramp generator. 4. In flasher circuit.
Description : Draw circuit diagram of Bistable multivibrator using IC-555 and explain its working.
Last Answer : Definition – A multivibrator which has two stable states, one can be change to other when trigger pulse is applied, known as bistable multivibrator. Circuit diagram of Bistable multivibrator using IC555
Description : The multivibrator circuit which processes one stable state and one quasi stable is (a) Astabel (b) Monostable (c) Bistable (d) Schmitt trigger circuit
Last Answer : The multivibrator circuit which processes one stable state and one quasi stable is Monostable
Description : The output of a balanced modulator is ____________. A. LSB and USB B. LSB C. USB D. Carrier
Last Answer : A. LSB and USB
Description : How can a series-positive limiter be modified to limit unwanted negative portions of the input signal?
Last Answer : Biasing.
Description : What methods are used to prevent unwanted component interaction?
Last Answer : Ground planes, shielding, and component placement.
Description : Which circuit detects frequency modulated signal? A. Modulator B. Discriminator C. Demodulator D. Modem
Last Answer : B. Discriminator
Description : Draw circuit diagram of transistor reactance modulator. Explain its working.
Last Answer : Explanation- A reactance modulator is illustrated in figure. It is basically a standard commonemitter class A amplifier. Resistors R1 and R2 from a voltage divider to bias ... frequency, whereas a lower capacitance increases the frequency. The circuit produces direct frequency modulations.
Description : Draw the circuit diagram of varactor diode FM modulator and explain its working.
Last Answer : Varactor diode modulator is the direct method of FM generation wherein the carrier frequency is directly varied by the modulating signal. A varactor diode is a semiconductor diode whose ... the magnitude of frequency change is proportional to the amplitude of the modulating signal voltage.
Description : An electrical device which prevents an action from occurring until all other required conditions are met is called a/an ___________. A. limit B. monitor C. modulator D. interlock
Description : Indicate the false statement. Noise figure is defined as A. the ratio of the S/N power supplied at the input terminal of a receiver or amplifier to the S/N power supplied to the output or ... under test, both working at the same temperature over the same bandwidth and fed from the same source
Last Answer : C. an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals
Description : EMD is best described by which statement? ∙ A. 70 percent of the core diameter and 70% of the fiber NA should be filled with light. ∙ B. 70 percent of the fiber diameter and 70% of the ... be measured at the output. ∙ D. 70 percent of the unwanted wavelengths should be attenuated by the fiber.
Last Answer : 70 percent of the core diameter and 70% of the fiber NA should be filled with light.
Description : EMDis best describe bywhich statement? a. 70percentofthe corediameter and70%ofthefiberNAshouldbe filled with light b.70 percent of the fiber diameter and 70% of the cone of acceptance should be filled with ... the output d.70 percent of the unwanted wavelengths should be attenuated by the fiber
Last Answer : a. 70percentofthe corediameter and70%ofthefiberNAshouldbe filled with light