In this type of microphone, a moving diaphragm is used as one plate of the capacitor. Capacitive Microphones. Multiple Choice Questions and Answers on Mobile Communication. The electret microphone dielectric is typically manufactured by heating a … Top 10 MCQ Questions on Sensors, and practical applications of different types of sensors. 1) The modulation technique used for mobile communication systems during world war II was. MCQ in Acoustics Part 1 as part of the Communications Engineering (EST) Board Exam. Self generating type transducers are _____ transducers. This section focuses on Amazon Web Services (AWS). Due to application of sound waves, diaphragm vibrates and changes the position of metal disc. 1. Capacitor microphone has two capacitor plates and hence the name. Contains latest information on sensors as well. These Multiple Choice Questions (MCQ) should be practiced to improve the Cloud Computing skills required for various interviews (campus interview, walk-in interview, company interview), placements, entrance exams and other competitive examinations. Equation of normal to the curve where it cuts x – axis; is (A) x + y = 1 (B) x – y = 1 (C) x + y = 0 (D) None of these. An emitter follower circuit is used to eliminate noise. In addition, the leading piezoMEMS microphone manufacturer, Vesper, explains[3] “whereas capacitive systems have to be constantly on, listening for keywords such as ‘Alexa’ or ‘Siri’, piezoMEMS microphones do not have a charge pump, and so have a very fast startup time. This dielectric retains a permanent charge equivalent to around 100 volts. MCQ : Application of derivative. The JFET is typically configured in a common-source configuration, while an external load resistor and dc blocking capacitor are used in the external application circuit. A constant charge is maintained by an external voltage source. The application of MEMS technology to microphone has led to the development of small microphone with high performance. The capacitor voltage variations are amplified and buffered by a JFET internal to the microphone housing. These are accurate instruments but are expensive. Measurement and Instrumentation Objective Questions 1. a) Active b) Passive c) Secondary d) Inverse Ans : (a) 2. The capacitor consists of two silicon plates/surfaces. capacitive gap that is sensitive to dust or moisture. The changes in capacitance cause a change in the capacitor voltage. Frequency modulation c. … This results into change in capacitance. AWS MCQ Questions & Answers. If y = a ln |x| + bx 2 + x has its extreme values at x = -1 and x = 2 then P ≡ (a , b) is (A) (2 , -1) (B) (2 , -1/2) (C) (-2 , 1/2) a. Amplitude modulation b. ECM application schematic Differences in Microphone Technologies The transducers that converts the input signal into the output signal, which is a discrete function of time is … The key to the electret microphone is the dielectric that is used between the two plates of the capacitor that form the microphone.. A sensor is a device that takes input from the physical environment. The fixed surface is covered by an electrode to make it conductive and is full of acoustic holes which allow sound to pass through. One plate is fixed while the other one is movable (respectively, the green plate and the grey one shown in the following figure). Multiple Choice Questions and Answers By Sasmita January 9, 2020. A pinoybix mcq, quiz and reviewers. One plate is fixed while another metal foil disc acts as movable diaphragm. capacitor microphone. basically a silicon capacitor. 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