Why is a high-gain transistor used in the phase-shift  oscillator?

1 Answer

Answer :

Because of the losses encountered in the RC networks.

Related questions

Description : The major function of transistor. Q2 is A) It provides voltage gain B) It provides the feedback signal C) It isolates the oscillator from loading effects D) It provides a phase shift.

Last Answer : ) It provides a phase shift.

Description : Which components provide the regenerative feedback signal in the phase-shift oscillator?

Last Answer : Resistor-capacitor networks.

Description : What is phase-shift oscillator?

Last Answer : A phase-shift oscillator is a simple electronic oscillator. It contains an inverting amplifier, and a feedback filter which 'shifts' the phase of the amplifier output by 180 degrees at the oscillation ... 180° at high frequencies, so that the phase shift at the desired oscillation frequency is 180°.

Description : Draw the labeled circuit of RC phase shift oscillator. State the formula for frequency of oscillator.

Last Answer : Frequency of oscillation is given by,

Description : Compare between RC phase shift oscillator and crystal oscillator.

Last Answer : RC phase shift oscillator Crystal oscillator This oscillator is used for low frequency range. Quartz crystal is mainly used in radio-frequency (RF) oscillators Used resistor and capacitor ... RC network is used as feedback network. Crystal is connected in feedback.

Description : Draw and explain RC phase shift Oscillator.

Last Answer : Circuit diagram of RC phase shift oscillator: WORKING: * Circuit consists of a single stage amplifier in common emitter configuration & RC phase shifting network. * R1, R2, RE provides biasing & CE ... . * The phase shift around the loop is 3600 only at one precise frequency.  

Description : In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be -

Last Answer : In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be 3

Description : Oscillator independent of phase shift is  (1) Relaxation (2) Wein bridge (3) Clapp (4) All of these

Last Answer : Oscillator independent of phase shift is Relaxation 

Description : What signal is used to synchronize the coherent oscillator to a fixed phase relationship with the transmitted pulse?

Last Answer : Coho lock pulse.

Description : What transmission method uses a stable cw reference oscillator, which is locked in phase with the transmitter frequency?

Last Answer : Pulse-Doppler.

Description : When you are testing the gain of an audio-frequency transistor with an ohmmeter, what is indicated by a 10-to-1 resistance ratio?

Last Answer : Normal gain.

Description : Which transistor configuration has a current gain of less than 1?

Last Answer : Common base.

Description : Which transistor configuration provides a phase reversal between the input and output signals?

Last Answer : Common emitter.

Description : In a transistor Colpitts oscillator, C1 = 0.001 µF, C2 = 0.01 µF and L = 5 µH. The frequency of oscillation in MHz will be (a) 2.37 MHz (b) 10.00 MHz (c) 11.54 MHz (d) 9.09 MHz 

Last Answer : c

Description : Phase-shift keying is similar to what other two types of modulation?

Last Answer : Cw and frequency-shift keying.

Description : What type of modulation depends on the carrier-wave phase shift?

Last Answer : Phase.

Description : Differentiate between positive and negative feedback on the basis of . (i) overall phase shift (ii) voltage gain (iii) stability (iv) applications 

Last Answer : Compare positive feedback and negative feedback on the basis of: (i) Gain (ii) Bandwidth (iii) Phase shift (iv) Stability

Description : When a transmitter uses a high-power oscillator to produce the output pulse, what switches the oscillator on and off?

Last Answer : High-voltage pulse from the modulator.

Description : What component in a blocking oscillator controls pulse width?

Last Answer : Transformer.

Description : What is the primary advantage of power-amplifier transmitters over keyed-oscillator transmitters?

Last Answer : Frequency stability.

Description : Name a disadvantage of sine-wave oscillator synchronizers.

Last Answer : It requires additional shaping circuits.

Description : What basic circuits meet the requirements of an externally synchronized master oscillator?

Last Answer : Sine-wave oscillator, single-swing blocking oscillator, and master trigger (astable) multivibrator.

Description : What is the primary advantage of power-amplifier transmitters over keyed-oscillator transmitters?

Last Answer : Frequency stability.

Description : Name a disadvantage of sine-wave oscillator synchronizers.

Last Answer : . It requires additional shaping circuits.

Description : What basic circuits meet the requirements of an externally synchronized master oscillator?

Last Answer : Sine-wave oscillator, single-swing blocking oscillator, and master trigger (astable) multivibrator.

Description : What type of multivibrator can be used as a radar master oscillator?

Last Answer : Free-running.

Description : What is the polarity of the first alternation of the tank circuit in an emitter-loaded npn pulsed oscillator?

Last Answer : Negative

Description : What is the identifying feature of a Colpitts oscillator?

Last Answer : Split capacitors.

Description : What is the difference between the series-fed and the shunt-fed Hartley oscillator?

Last Answer : In the series-fed Hartley oscillator, dc flows through the tank circuit.

Description : What is the main difference between the Armstrong oscillator and the Hartley oscillator?

Last Answer : Feedback coil. Armstrong uses a separate coil. Hartley uses a tapped coil.

Description : Which oscillator uses tapped capacitors for feedback?

Last Answer : Colpitts.

Description : Which oscillator uses a tapped inductor for feedback?

Last Answer : Hartley.

Description : Which oscillator uses a tickler coil for feedback?

Last Answer : Armstrong.

Description : In a heterodyne-type frequency meter, what is the difference between the oscillator frequency and the unknown frequency?

Last Answer : Beat frequency.

Description : What characteristic of a gunn oscillator is inversely proportional to the transit time of the domain across the semiconductor?

Last Answer : The frequency.

Description : Why is the tunnel diode loosely coupled to the cavity in a tunnel-diode oscillator?

Last Answer : To increase the stability.

Description : What determines the frequency of a tunnel-diode oscillator?

Last Answer : The tuned circuit or cavity frequency.

Description : In an fm transmitter, when does an oscillator generate only a steady frequency?

Last Answer : When no modulation is present.

Description : What is the function of the oscillator in a cw transmitter?

Last Answer : It generates an rf carrier at a given frequency within required limits.

Description : Name two methods of oscillator keying.

Last Answer : Plate keying and cathode keying.

Description : Which of the following actions can be carried out in order to prevent thermal runaway in a transistor? A. Increase the current through the collector-base junction. B. Install a heat sink. ... point to increase collector current. D. Increase the potential difference between the emitter and the base.

Last Answer : Answer: B

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 : In a sawtooth generator, why is the transistor turned on for a longer time than the discharge time of the RC network?

Last Answer : To allow the capacitor time to discharge.

Description : What are the factors that limit the frequency response of a transistor amplifier?

Last Answer : The capacitance and inductance of the circuit and the interelectrode capacitance of the transistor.

Description : When you are using an ohmmeter to test a transistor for leakage, what is indicated by a low, but not shorted, reverse resistance reading?

Last Answer : A leaking transistor

Description : What are two transistor tests that can be done with an ohmmeter?

Last Answer : Gain and junction resistance.

Description : How is the collector lead identified on an oval-shaped transistor?

Last Answer : By the wide space between the collector lead and the other two leads (emitter and base)

Description : What safety precaution must be taken before replacing a transistor?

Last Answer : The power must be removed from the circuit.

Description : Which transistor configuration has the highest input resistance?

Last Answer : Common collector.

Description : What method for checking transistors is cumbersome when more than one transistor is bad in a circuit?

Last Answer : The substitution method.