An emitter follower circuit is used to eliminate noise. Equation of normal to the curve where it cuts x â axis; is (A) x + y = 1 (B) x â y = 1 (C) x + y = 0 (D) None of these. A constant charge is maintained by an external voltage source. 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. One plate is fixed while the other one is movable (respectively, the green plate and the grey one shown in the following figure). Due to application of sound waves, diaphragm vibrates and changes the position of metal disc. Capacitor microphone has two capacitor plates and hence the name. If y = a ln |x| + bx 2 + x has its extreme values at x = -1 and x = 2 then P â¡ (a , b) is (A) (2 , -1) (B) (2 , -1/2) (C) (-2 , 1/2) The fixed surface is covered by an electrode to make it conductive and is full of acoustic holes which allow sound to pass through. Multiple Choice Questions and Answers By Sasmita January 9, 2020. Measurement and Instrumentation Objective Questions 1. The transducers that converts the input signal into the output signal, which is a discrete function of time is ⦠The capacitor voltage variations are amplified and buffered by a JFET internal to the microphone housing. The application of MEMS technology to microphone has led to the development of small microphone with high performance. basically a silicon capacitor. Contains latest information on sensors as well. The first capacitive microphone was ... of capacitive microphone on mechanical sensitivity and diaphragm deflection. This section focuses on Amazon Web Services (AWS). ECM application schematic Differences in Microphone Technologies In addition, the leading piezoMEMS microphone manufacturer, Vesper, explains[3] âwhereas capacitive systems have to be constantly on, listening for keywords such as âAlexaâ or âSiriâ, piezoMEMS microphones do not have a charge pump, and so have a very fast startup time. Multiple Choice Questions and Answers on Mobile Communication. These are accurate instruments but are expensive. 1. AWS MCQ Questions & Answers. A pinoybix mcq, quiz and reviewers. Then compared the analysis result with microphone ⦠The electret microphone dielectric is typically manufactured by heating a ⦠a) Active b) Passive c) Secondary d) Inverse Ans : (a) 2. This results into change in capacitance. Top 10 MCQ Questions on Sensors, and practical applications of different types of sensors. One plate is fixed while another metal foil disc acts as movable diaphragm. Capacitive Microphones. Frequency modulation c. ⦠capacitor microphone. 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