The pointer attains a steady position when controlling torque becomes numerically equal to deflecting torque i.e., Tc = Td This is used to amplify low-amplitude outputs from the primary transducer or variable conversion element, thus improving the sensitivity and resolution of the measurement. An ammeter is used to. Chemical Effect 39. Which of the following is its kinetic energy in the first excited state? 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. 13-A piezo-electrical crystal generates voltage when subjected to ____ force. Function of transducer is to convert A. Some examples of primary sensors are a liquid-in-glass thermometer, a thermocouple, and a strain gauge. In simple cases, the system can consist of only a single unit that gives an output reading or signal according to the magnitude of the unknown variable applied to it. it acts like a closed switch so it indicates the current. Multiple Choice Questions and Answers on Semiconductor Theory. Integrating Instruments: Rm = resistance of the ammeter = 25Ω Ques.9. 7-It is the ability of the sensor to indicate the same output over a period of time for a constant input. Controlling torque is also known as restoring torque i.e., it brings back the pointer to its zero position when deflecting torque is withdrawn. 4-The following is not a static performance parameter to be looked into before selecting a parameter. (A) Hall Effect sensor (B) Proximity sensor (C) Light sensor (D) All of the above. This deflecting torque can be produced by any of this effects of current (or of voltage) such as. Ques.2. Ques.10. Ampere-hour and watt-hour (energy) meters are examples of this category. MCQs on input and output devices (GK Objective Question Answer) exam question answer for competitive exam of govt jobs. Basically, there are three types of Force or torque act upon the Measuring Instrument. A measuring system exists to provide information about the physical value of some variable being measured. Show Explanation Given below are top 10 MCQ Questions on Sensors and their working. aspects of the hearing process, the physics of the ear. Top 100 Sensors & Transducers Questions and Answers for Freshers : interview questions and answers for instrumentation and control engineering. If the displacement is measured with strain gauge then the number of strain gauge normally required are A. Deflecting Torque: In order to move the pointer from its zero position on the scale deflecting torque is required. Where φ is the potential gradient WIRELESS SENSOR NETWORKS 1 CHAPTER 1: INTRODUCTION 1>MEMS stands for_____ 2>A sensor network is subject to a unique set of resource constraints such as a: finite on-board battery power b: limited network communication bandwidth Ans: _____ (a/b/both) 3>In a typical sensor network, each sensor ⦠Damping Torque: At the final deflected position, when the deflecting and controlling torques are equal, the pointer starts oscillating owing to its inertia and therefore, cannot immediately settle at its final deflected position. In hot wire instrument, the sensing wire is made of. Ques.3. Controlling Torque Induced voltage by the applied magnetic field C. Movement of charge carriers towards one end D. All of the above The total energy of the electron in the hydrogen atom in the ground state is -13.6 eV. Recording Instrument: The recording instruments are those instruments which give a continuous record of the variations of the electrical quantity to be measured. Take the Quiz and improve your overall Engineering. In other words, the potential gradient is small. Analog sensors theoretically have infinite resolution but is limited by noise. 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. Example: The example of such an instrument is Recording voltmeters which are used in power stations to record the generated voltage. Shunts are small resistances connected in parallel to increase the range of an ammeter. Try the following multiple choice questions to test your knowledge of this chapter. The potentiometer makes use of null or balanced condition for the purpose of measurement. Hence ammeter is connected in series with the low resistance. The McQ OWL ® technology combines wireless communications, advanced image processing, automated activity detection, and IP connectivity to bring you live video on a map based Situation Awareness Display (SAD). comes into action. Answer.3. Spring control and gravity control are used for controlling torque. Damping Torque: At the final deflected position, when the deflecting and controlling torques are equal, the pointer starts oscillating owing to its inertia and therefore, cannot immediately settle at its final deflected position. Physics MCQ Mock Test Chapter-6 - JOBS AND EXAMS. Secondary instruments:- Secondary instruments are so constructed that the value of current, voltage or other quantity to be measured can be determined from the malefaction of the instruments, only if the latter has been calibrated by comparison with either an absolute instrument or one which has already been calibrated. a = m . Voltmeter These instruments utilize the principle of expansion of wire, heat due to the current being measured, passing through the wire. comes into action. In other words, the potential gradient is small. A deflecting torque is required to overcome the inertia, damping effect and controlling effect of the moving system. This is especially undesirable if the number of readings to be taken is quite large. Note that a transducer and a sensor are not the same. It is a moving coil galvanometer in which a low resistance wire is connected in parallel. This is especially undesirable if the number of readings to be taken is quite large. It is important that the measurement system is designed properly such that the output from measurement sensors is of an appropriate amplitude and is as free from noise contamination as possible. It is equal to the â product of mass m and centripetal acceleration ad, i.e. A measuring system exists to provide information about the physical value of some variable being measured. A shunt resistor is then used whose resistance is practically constant over the operating temperature range; this guarantees a constant ratio between the coil resistance and the shunt resistance. 18-Inductive proximity sensors can be effective only when the objects are of _____ materials. So dear reader I have provided top expected gk questions from input and output device of computer. In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: This causes the current that is to be measured to divide, a small part flowing through the coil and the remainder passing through the shunt resistor. 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). 16-Following is (are) the type(s) of Light sensor(s) (A) Photo sensor (B) Photo transistors (C) Photo conductors (D) All of the above. This deflecting torque can be produced by any of this effects of current (or of voltage) such as 1-Which of the following is not covered under Mechanical energy domain? Vr=(Rs×If)Vr=(Rs×If) (We know that Ra=0 ), Ques.7. Required fields are marked *. Answer.1. For example, amplification is needed for thermocouples, which have a typical output of only a few millivolts. Show Explanation For multi-range ammeters, the moving coil remaining same; separate shunts are used to increase the range of measurement of a single instrument. Signal processing elements:- Signal processing elements exist to improve the quality of the output of a measurement system in some way. The electronic amplifier is a very common type of signal processing element. Damping Torque Signal processing elements:- Signal processing elements exist to improve the quality of the output of a measurement system in some way. Solid State Detectors and Electronics â Sensor Physics I Helmuth Spieler TRIUMF Summer Institute 2007 LBNL Intrinsic Resolution of Semiconductor Detectors FWHM 2.35 i Q 2.35 i 2.35 i i E E FN F FEE E = Ë = Ë = Si: Ei = 3.6 eV F = 0.1 Ge: Ei = 2.9 eV F = 0.1 Detectors with good efficiency for this Is connected in parallel in a circuit and only part of the current to the measured flows through it. Show Explanation To extend the current-measuring capabilities of the meter movement it is necessary to connect a resistor in parallel with the coil. utting a large resistance in series with the actual measuring part of the instrument. Two soap bubbles have radii in the ratio of 4:3. A potentiometer is an instrument designed to measure an unknown voltage by comparing it with a known voltage. In some cases, the primary sensor and variable conversion element are combined, and the combination is known as a transducer. Thus, for the measurement of large current and voltage values, it is necessary to employ a device which reduces the current and voltage of the instrument by a known proportion. Transducer - MCQs with answers Q1. In a broad sense, analog instruments may be classified into two ways: Absolute instruments:- Absolute instruments give the value of the electrical quantity to be measured in terms of the constants of the instruments and to its deflection, no comparison with another instrument being required. The secondary instruments may be classified as. Passive: Does sensor draw energy from the signal ? Difference between successive tests under identical conditions. Rsh = shunt resistance = 75Ω, The full-scale deflection current Im is given as. 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