Other types of signal processing element are those that filter out induced noise and remove mean levels, etc. Induced voltage by the applied magnetic field C. Movement of charge carriers towards one end D. All of the above Magnetic effect 17-Following type of sensors are used to generate information in object grasping and obstacle avoidance. To see this page as it is meant to appear, please enable your Javascript! If the displacement is measured with strain gauge then the number of strain gauge normally required are A. Primary Sensors:- The first element in any measuring system is the primary sensor: this gives an output that is a function of the measurand (the input applied to it). The variation of the quantity being measured is recorded by a pen Attache to the moving system of the instrument; the moving system is operated by the quantity being measured on a sheet of paper that moves perpendicular to the movement of the pen. An ammeter is converted into voltmeter by putting a large resistance in series with the actual measuring part of the instrument. Some examples of primary sensors are a liquid-in-glass thermometer, a thermocouple, and a strain gauge. Drop across the crystal is due to the current passed through it B. The summation, which they give, is the product of time and an electrical quantity. In some cases, the primary sensor and variable conversion element are combined, and the combination is known as a transducer. The electronic amplifier is a very common type of signal processing element. The period of oscillation of a simple pendulum is given by where l is about 100 cm and is known to 1mm accuracy. MCQs on input and output devices (GK Objective Question Answer) exam question answer for competitive exam of govt jobs. 1. Instrumentation Interview Questions Instrumentation MCQ Multiple Choice Questions. As the deflection of the pointer increases, the controlling torque also increases and stops the pointer at the measured value. This known voltage is supplied by a standard cell or through a reference source. One B. measure current in amperes. Signal processing elements:- Signal processing elements exist to improve the quality of the output of a measurement system in some way. 19-Following acts as detector in Optical sensor, 1-(B), 2-(D), 3-(D), 4-(B), 5-(D), 6-(B), 7-(A), 8-(C), 9-(D), 10-(A), 11-(C), 12-(D), 13-(B), 14-(C), 15-(C), 16-(D), 17-(B), 18-(A), 19-(B), Your email address will not be published. For example, amplification is needed for thermocouples, which have a typical output of only a few millivolts. It consists of a hot wire of platinum-iridium (because it can withstand high temperatures of about 300°C without being oxidized), and about 0.2 mm in diameter. Chemical Effect An ammeter measures the value of current flowing in the circuit, so current should flow inside ammeter to give proper result. Also explore over 27 similar quizzes in this category. A measuring system exists to provide information about the physical value of some variable being measured. Errors in Measurement MCQs with Answers. Putting a large resistance in series with the actual measuring part of the instrument. Hence it is used in series. In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: This class of instruments is in most general use, the absolute instrument being seldom used except in standard laboratories and similar institutions. Integrating instruments record totalized events over a specified period of time. For example, the tangent galvanometer gives the value of the current to be measured in terms of the tangent of the angle of deflection produced by the current, the radius and the number of turns of galvanometer coil, and the horizontal component of the earth’s magnetic fierce. These instruments utilize the principle of expansion of wire, heat due to the current being measured, passing through the wire. So In the case of longer wire, the fall of potential per unit length is small. Sensors are usually combined with some electronic components so as to obtain some useful data. In the case of the mercury-in-glass thermometer, the output reading is given in terms of the level of the mercury, and so this particular primary sensor is also a complete measurement system in itself. Ques.3. 6-The ability to give same output reading when same input value is applied repeatedly is known as. Instrumentation Engineering Objective Questions. 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