Colpitts Oscillator Question & Answers June 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 Hint 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 Hint 3). _____divider is placed at the center of the sub circuit in the Colpitts oscillator. Inductance Capacitance Resistance None of these Hint 4).Whereas in Hartley oscillator _______ type exists. Transformer Autotransformer Ringing Shields None of these Hint 5). Due to the capacitive divider present in the Colpitts oscillator, it acts as _____ source. External Internal Feedback None Of these Hint 6). Two capacitances have been placed beyond one common _____ circuit? Capacitor Inductor Resistor Amplifier Hint 7). What is the condition for Colpitts oscillator circuit? XC1 + XC2 = XL XC1 - XC2 = XL XC1 / XC2 = XL XC1 + 1/XC2 = XL Hint 8). Colpitts oscillator is ____ to design. Simple Complex Unique Tough Hint 9). Colpitts capacitive circuit model has ____ frequency stability. Worse Improved Unique Complex Hint 10). Hartley and Colpitts use the same ____ BJT? Double Single Null None of these Hint Colpitts Oscillator Quiz Questions and Answers 11). Colpitts oscillator at the end provides a ____ output? Ramp Square Sinusoidal Rectangular Hint 12). The circuit with two capacitors and one inductance is called a_____? Tank Circuit Resonance Circuit Amplifier Circuit Transistor Hint 13). Colpitts oscillator Circuit has one ____ transistor? PNP NPN PN NP Hint Read more about NPN transistor. 14). RFC stands for _______? Resonance frequency circuit Regular frequency circuit Radiofrequency choke None of these Hint 15). Number of oscillations in Colpitts oscillator is calculated by ______? Resonant Frequency Maximum Frequency Stabilized Frequency Bandwidth Hint 16). Resonant frequency of tank circuit is_______? 2PiLC 1/[2pi LC ] 1/[3pi LC ] 1/[4pi LC ] Hint 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 Hint 18). Amount of feedback in the Colpitts oscillator depends on the _____ ratio. Resistance Capacitance Inductance Amplifier Hint 19). Phase shift produced when capacitances are connected in series is ____? 0^0 90^0 180^0 270^0 Hint 20). Phase shift produced when capacitances are connected in parallel is ___? 0^0 90^0 180^0 270^0 Hint 21). By changing the ______ values, the feedback voltage values are also changed? Capacitors Inductors Resistors Transistors Hint 22). High quantity of feedback can obtain the sine wave which is _____? Disturbed Allowed Transferred Moved Hint 23). The percentage of feedback capacitances is represented as_____? C1/C2 C2-C1 C1C2 C1+C2 Hint 24). The circuit does not ______ when a minimum quantity of feedback occurs? Transfers Stops Oscillate None of these Hint 25). Voltage over C1 is ____ than voltage over C2 in Colpitts oscillator? Lesser Greater Minimum Least Hint Colpitts Oscillator Interview Questions and Answers 26). Resistance is measured in terms of __? Ohms Farads Columbs Henrys Hint 27). Inductance is measured in ____? Ohms Henry Farads Amps Hint 28). If the capacitance values are C1=24nF and C2=240nF, then the feedback ratio is _____? 20% 10% 5% 12% Hint 29). FET or Op-amp must be operated at ____ frequencies? Low High Minimum Null Hint Read more about Op-amp. 30). Colpitts oscillator employed as _______ oscillator and performs best when tuning is done? Feedback Variable-Frequency Hartley Hint 31). Input impedance Z, formula is represented as ______? V/I I/V 1/V None of these Hint 32). gm is the _______ of the transistor. Transconductance Impedance Conductance Inductance Hint 33). IC is represented as _____ in a common base oscillator? Collector Current Bias Current Impulsive Current Direct Current Hint 34).______ oscillator is also equivalent to Colpitts oscillator? Hartley Pierce Feedback Common-base Hint 35). Difference of two voltages v1 and v2 are represented by _____? v1+v2 v1/v2 v1*v2 v1-v2 Hint 36). Less number of _____ are required to build the circuit? Wires Components Screw None of these Hint 37). Colpitts oscillator can ____ with high and low temperatures? Resist Outstand Improve Move Hint 38). Frequencies are varied based on _____ capacitors? Constant Varying Instant None of these Hint 39). Frequency stability is _____ in Colpitts oscillator? Least High Minimum None of these Hint 40). Amplitude output remains _____ over the fixed frequency range? Constant Varying Instant None Of these Hint Colpitts Oscillator MCQs for Exams 41). Colpitts oscillator is used in ____ wave generator. Square Rectangular Sine Circle Hint 42). Colpitts oscillator is also used as _____ oscillator? Feedback Radiofrequency Bandwidth Wavelength Hint 43). Colpitts oscillator is used as local oscillators in radio ____? Transmitters Receivers Oscillators None of these Hint 44). Application of Colpitts oscillator is ______? Medical applications Mobile applications Industrial applications None of these Hint 45). Colpitts oscillator is used as a _______ sensor with added circuits. Temperature Pressure Force Vibration Hint Read more about Temperature Sensor. 46). Sequence of undamped oscillations are formed by ______ criterion? Hartley Barkhausen Shifting Tank Circuit Hint 47). Admittance is determined by its ______ parameters? S Y Hybrid ABCD Hint 48). Feedback circuits are determined by the _____ parameters? Hybrid Admittance ABCD Scattering Hint 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 Hint 50). Colpitts oscillator is designed to remove drawbacks of ____ oscillator? Feedback Hartley Crystal Voltage-controlled Hint For More MCQs Oscillators Questions & Answers Wien Bridge Oscillator Questions & Answers Please fill in the comment box below. Time's up