Common Base Amplifier Question & Answers October 19, 2022 By WatElectronics This article lists 30 Common Base Amplifier MCQs for engineering students. All the Common Base Amplifier 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 Common Base Amplifier. Amplifiers are electronic devices that are capable of amplifying input signals to produce the desired outcome. Input signals voltage or power increased by amplifying. The process of amplifying is referred to as amplification. Energy to perform amplification is taken from an external source connected to a circuit. Waveforms produced at the output have large amplitudes. Amplifiers are classified into various categories based on the type of wave amplified like Current amplifiers, Voltage amplifiers, Trans-resistance amplifiers, and Transconductance amplifiers. Bipolar Junction Transistor amplifiers are excellent amplifiers if operate in active-forward modes. It is capable of providing high voltages at the output, power, and current gains. It is classified into three configurations based on the grounded and the common terminals. Common Base Amplifier is one of the configurations of BJT where the base is common for both output and inputs. These amplifiers are preferred where impedances at the input must be low and for matching impedances. 1). Which terminal in Common Base Amplifier is common for output and input signals? Emitter Collector Base a & b None Hint 2). At which terminal, input is applied for BJT configuration of Common Base Amplifier? Emitter Collector Base a & b None Hint 3). Which junction of the Common Base Amplifier is biased forward? Collector-Emitter Base-Emitter Collector-Base None None Hint 4). Common Base Amplifier is also referred to as ____________? Grounded-Base Grounded-Emitter Grounded-Collector Ground None Hint 5). Input impedance of a Common Base Amplifier is __________? High Low Greater Highest None Hint 6). Voltage gain is _________ in Common Base Amplifier? Low High Negligible Constant None Hint 7). The current gain of Common Base Amplifier under ideal circumstances is_________? Zero Unity Infinity Constant None Hint 8). The outcome obtained in Common Base configuration is _______ and in phase of output? Same Different Distinct Dynamic None Hint 9). What is the Amplification factor of current for Common Base configuration? α β λ ω None Hint 10). What is the formula of the Amplification factor of current for Common Base configuration? ∆IB/∆IE ∆IE/∆IC ∆IB/∆IC ∆IC/∆IE None Hint Common Base Amplifier MCQs for Interviews 11). In the Common Base configuration of BJT amplifiers given IE is 1 m Amps. If the emitter is open-circuited and current at the collector is 50 micro-Amps and α is equivalent to 0.92. Calculate the overall current at the collector. 0.94mA 0.95A 0.96mA 0.97A None Hint 12). Why impedance at the input is low in Common Base Amplifier? High Currents Low Currents High Power Low Power None Hint 13). For a Common Base Amplifier given IB = 0.4mA & IE = 1.2 mA calculate IC? 0.6 mA 0.7 mA 0.8 mA 0.9 mA None Hint 14). Which junction is reverse-biased in Common Base Amplifier? Collector-Emitter Base-Emitter Collector-Base None None Hint 15). For a Common Base Amplifier current at the collector is 0.96 mA and the current at the base is 0.04 mA then find α. 0.94 mA 0.95 mA 0.96 mA 1 mA None Hint 16). For a Common Base Amplifier current at the base is 0.24 mA and at the emitter is 1.4 mA. Find the current at the collector. 1 mA -1.16 mA 1.16 mA -1 mA None Hint 17). Common Base Amplifiers current-gain is ________? 0.98 0 1 Infinite None Hint 18). Why Common Base Amplifiers are capable of providing higher voltage gains? Low Input Impedance High Output Impedance Low Output Impedance a & b None Hint 19). Load and the source of signal shares ________ of the transistor in the Common Base Amplifier? Base Collector Emitter Source None Hint 20). Common Base amplifier operates as a __________? Ideal Power Source Ideal Voltage Source Ideal Current Source All Mentioned Above None Hint Common Base Amplifier MCQs for Exams 21). Which amplifier is preferred to receive high-frequency signals? Common Base Common Source Common Emitter All Can be Used None Hint 22). ____________ utilized as a part for multi-stage or cascode configurations? Common Base Amplifier UJT Inverter Multiplexer None Hint 23). For which frequencies Common Base Amplifiers are used? Audio Radio Microwave a & b None Hint 24). Which configuration of BJT is used the least? Common Emitter Common Base Common Collector Common Source None Hint 25). If BJT is in Common Base configuration, what characteristic is considered to be high? Current Power Input Impedance Input Resistance None Hint 26). Common Base provide ____________ resistance at output for a circuit with high resistance at input? High Low Greater Highest None Hint 27). Microphones uses ___________ configuration of Bipolar Junction Transistor? Common Base Common Source Common Emitter Common Gate None Hint 28). Input capacitance doesn’t suffer from Miller effect in ____________ configuration of Bipolar Junction Transistor? Common Base Common Drain a & b Common Gate None Hint 29). Which configuration of FET is analogous to Common Base Amplifier? Common-Source Common-Drain Common-Gate None None Hint 30). What are the uses of a Common Base Amplifier? Voltage Amplifier Current Amplifier Power Amplifier a & b None Hint For More MCQs MOSFET Amplifier Question & Answers Cascade Amplifier Question & Answers DC Amplifier Question & Answers Tuned Amplifier Question & Answers Instrumentation Amplifier Question & Answers Differential Amplifier Question & Answers Class D Amplifier Question & Answers Power Amplifier Question & Answers Low Noise Amplifier Question & Answers Cascode Amplifier Question & Answers Positive Feedback Amplifier Question & Answers Multistage Amplifier Question & Answers Please fill in the comment box below. Time's up
