Colpitts Oscillator Question & AnswersJune 8, 2022 By WatElectronics This article lists 50 Colpitts Oscillator MCQs for engineering students. All the Colpitts Oscillator Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Colpitts Oscillator.A Colpitts oscillator is the reverse of the Hartley oscillator where all the inductors and capacitors are placed in one tank circuit. Resistors in the Colpitts oscillator provide bias in the circuit. Capacitors are placed in a circuit to block some D.C and to allow only A.C current outside the supply source. The tank circuit is built with two capacitances that have been placed beyond one common inductor circuit.Phase shift produced when capacitances are connected in series are 1800 and when connected in parallel produces phase shift 00 and 3600. The resonant frequency value of the Colpitts oscillator is given as 1/2LCT. Advantages of Colpitts oscillator are high-frequency stability, very simple to design, less component requirement, the amplitude remains constant over the fixed frequency range, and it can bear both low and high temperatures.Applications of Colpitts oscillator are used in radio frequency oscillators, radio receivers, commercial purposes, wireless communications, and also in sine wave generators.1). Colpitts oscillator is the reverse of _____ oscillator. LC Hartley RLC RC HintOscillator whose feedback is achieved by an inductive divider. Read more about Hartley Oscillator.2). ____ is connected between the collector and base of the 1-stage transistor amplifier. LC resonance Hartley RLC resonance RC resonance HintWhich holds both inductor and capacitor values.3). _____divider is placed at the center of the sub circuit in the Colpitts oscillator. Inductance Capacitance Resistance None of these HintWhich stores electrical energy.4).Whereas in Hartley oscillator _______ type exists. Transformer Autotransformer Ringing Shields None of these HintWhich automatically transfers from one to another.5). Due to the capacitive divider present in the Colpitts oscillator, it acts as _____ source. External Internal Feedback None Of these HintWhere output is applied to vice versa.6). Two capacitances have been placed beyond one common _____ circuit? Capacitor Inductor Resistor Amplifier HintWhich stores magnetic energy.7). What is the condition for Colpitts oscillator circuit? XC1 + XC2 = XL XC1 - XC2 = XL XC1 / XC2 = XL XC1 + 1/XC2 = XL HintRepresents resultant inductance is the sum of two values of XC1 and XC2.8). Colpitts oscillator is ____ to design. Simple Complex Unique Tough HintRepresents which is very easy.9). Colpitts capacitive circuit model has ____ frequency stability. Worse Improved Unique Complex HintRepresents which has been better.10). Hartley and Colpitts use the same ____ BJT? Double Single Null None of these HintWhich represents holding unique value.Colpitts Oscillator Quiz Questions and Answers11). Colpitts oscillator at the end provides a ____ output? Ramp Square Sinusoidal Rectangular HintGeometric waveform which oscillates periodically.12). The circuit with two capacitors and one inductance is called a_____? Tank Circuit Resonance Circuit Amplifier Circuit Transistor HintWhich is also represented as a resonance circuit.13). Colpitts oscillator Circuit has one ____ transistor? PNP NPN PN NP HintWhich has two N types of transistors. Read more about NPN transistor.14). RFC stands for _______? Resonance frequency circuit Regular frequency circuit Radiofrequency choke None of these HintRepresents the oscillating rate of the electromagnetic spectrum.15). Number of oscillations in Colpitts oscillator is calculated by ______? Resonant Frequency Maximum Frequency Stabilized Frequency Bandwidth HintWhich is a natural frequency where medium vibrates at a high level.16). Resonant frequency of tank circuit is_______? 2PiLC 1/[2pi LC ] 1/[3pi LC ] 1/[4pi LC ] HintWhich represents the reciprocal of the square root of LC with 2pi radians.17). The capacitance of the circuit CT, in which C1 and C2 are connected in series is ______? C1*C2/C1+C2 C1+C2/C1*C2 1/C1+C2. C1*C2 HintWhich represents the value of 1/C1 +1/C2.18). Amount of feedback in the Colpitts oscillator depends on the _____ ratio. Resistance Capacitance Inductance Amplifier HintWhich stores electric charge.19). Phase shift produced when capacitances are connected in series is ____? 0^0 90^0 180^0 270^0 HintRepresents the straight line after one cycle.20). Phase shift produced when capacitances are connected in parallel is ___? 0^0 90^0 180^0 270^0 HintPhase shift produced when capacitances are connected in parallel are 00.21). By changing the ______ values, the feedback voltage values are also changed? Capacitors Inductors Resistors Transistors HintWhich stores electric charge.22). High quantity of feedback can obtain the sine wave which is _____? Disturbed Allowed Transferred Moved HintRepresents a distortion of signals.23). The percentage of feedback capacitances is represented as_____? C1/C2 C2-C1 C1C2 C1+C2 HintRation of terms.24). The circuit does not ______ when a minimum quantity of feedback occurs? Transfers Stops Oscillate None of these HintWhich does move in to and fro motion.25). Voltage over C1 is ____ than voltage over C2 in Colpitts oscillator? Lesser Greater Minimum Least HintWhich is up to the maximum limit.Colpitts Oscillator Interview Questions and Answers26). Resistance is measured in terms of __? Ohms Farads Columbs Henrys HintOpposes current.27). Inductance is measured in ____? Ohms Henry Farads Amps HintOne kilogram meter squared per second squared per ampere squared.28). If the capacitance values are C1=24nF and C2=240nF, then the feedback ratio is _____? 20% 10% 5% 12% HintRepresents the sum of 5+5 percentage value.29). FET or Op-amp must be operated at ____ frequencies? Low High Minimum Null HintRepresents up to the maximum limit. Read more about Op-amp.30). Colpitts oscillator employed as _______ oscillator and performs best when tuning is done? Feedback Variable-Frequency Hartley HintRepresents a change from one process to another.31). Input impedance Z, formula is represented as ______? V/I I/V 1/V None of these HintRepresents the division of voltage and current.32). gm is the _______ of the transistor. Transconductance Impedance Conductance Inductance HintWhich is used to know the performance of the transistor.33). IC is represented as _____ in a common base oscillator? Collector Current Bias Current Impulsive Current Direct Current HintAverage of currents into two input terminals.34).______ oscillator is also equivalent to Colpitts oscillator? Hartley Pierce Feedback Common-base HintRepresents a forced way through.35). Difference of two voltages v1 and v2 are represented by _____? v1+v2 v1/v2 v1*v2 v1-v2 HintRepresents the subtraction of voltages.36). Less number of _____ are required to build the circuit? Wires Components Screw None of these HintRepresents a part of a machine or vehicle.37). Colpitts oscillator can ____ with high and low temperatures? Resist Outstand Improve Move HintRepresents the action or effect.38). Frequencies are varied based on _____ capacitors? Constant Varying Instant None of these HintFrequencies are varied based on varying capacitors.39). Frequency stability is _____ in Colpitts oscillator? Least High Minimum None of these HintRepresents up to the maximum limit.40). Amplitude output remains _____ over the fixed frequency range? Constant Varying Instant None Of these HintWhich remains unchanged.Colpitts Oscillator MCQs for Exams41). Colpitts oscillator is used in ____ wave generator. Square Rectangular Sine Circle HintGeometric waveform which oscillates periodically.42). Colpitts oscillator is also used as _____ oscillator? Feedback Radiofrequency Bandwidth Wavelength HintThis is the oscillation rate of an electric current.43). Colpitts oscillator is used as local oscillators in radio ____? Transmitters Receivers Oscillators None of these HintA device that retrieves electrical signals.44). Application of Colpitts oscillator is ______? Medical applications Mobile applications Industrial applications None of these HintType of application software designed to run.45). Colpitts oscillator is used as a _______ sensor with added circuits. Temperature Pressure Force Vibration HintRepresents the intensity of heat. Read more about Temperature Sensor.46). Sequence of undamped oscillations are formed by ______ criterion? Hartley Barkhausen Shifting Tank Circuit HintIt is a series of sudden changes in size and direction.47). Admittance is determined by its ______ parameters? S Y Hybrid ABCD HintComposed of different elements.48). Feedback circuits are determined by the _____ parameters? Hybrid Admittance ABCD Scattering HintIt is a reverse of impedance.49). If the loop gain of the amplifier is greater than one, then the oscillations are ____ in the circuit? Carried Removed Emptied None of these HintWhich represents transfer over the circuit.50). Colpitts oscillator is designed to remove drawbacks of ____ oscillator? Feedback Hartley Crystal Voltage-controlled HintOscillator whose feedback is achieved by an inductive divider.For More MCQsOscillators Questions & AnswersWien Bridge Oscillator Questions & Answers Please fill in the comment box below. Time is Up! Time's up
