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. 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. Try the following multiple choice questions to test your knowledge of this chapter. Ques.10. Magnetic effect The deflection obtained is meaningless until such a calibration has been made. Basically, there are three types of Force or torque act upon the Measuring Instrument. 10-Following is not an example of transducer. So please do visit examtiger regularly. Show Explanation Recording instruments give a continuous record of the quantity being measured over a specified period. Class 11th Physics | MCQs based on Errors in Measurement. The period of oscillation of a simple pendulum is given by where l is about 100 cm and is known to 1mm accuracy. So dear reader I have provided top expected gk questions from input and output device of computer. The electrical aspects of information transfer will be discussed in section 6. Practice Test: Question Set - 07 1. it acts like a closed switch so it indicates the current. Other types of signal processing element are those that filter out induced noise and remove mean levels, etc. The potentiometer makes use of null or balanced condition for the purpose of measurement. Linearity is the maximum deviation from a line of best fit Explain the repeatability of a transducer. Which of the following is not an integrating instrument? Top 1000 Instrumentation Engineering Objective Questions. The resistance change cannot be easily measured and so it is converted to a change in voltage by a bridge circuit, which is a typical example of a variable conversion element. Lesser the potential gradient, more accurate is the potentiometer. 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. In such instruments, there are sets of dials or gears which register the total quantity of electricity or the total amount of electrical energy supplied to a circuit in a given period. Lesser the potential gradient, more accurate is the potentiometer. Variable conversion elements:- They are needed where the output variable of a primary transducer is in an inconvenient form and has to be converted to a more convenient form. 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. Where φ is the potential gradient Vr- Voltage range you required to measure (KNOWN VALUE), If– Current required to full-scale deflection of your Ammeter (KNOWN VALUE), Ra- Internal Resistance of Ammeter (Ideally Ra=0). 39. If the displacement is measured with strain gauge then the number of strain gauge normally required are A. Dec 19,2020 - Modern Physics Practice Level - 1 | 45 Questions MCQ Test has questions of Class 12 preparation. This quiz contains practice questions for Measurement Of Physical Quantities (O Level).There are explanations for some of the questions after you submit the quiz. However, in more complex measurement situations, a measuring system consists of several separate elements as shown in Figure. A potentiometer is an instrument designed to measure an unknown voltage by comparing it with a known voltage. Controlling Torque: With the help of the deflecting torque, the pointer deflection will take place on the calibrated scale but to stop the pointer at the definite position, controlling torque (Tc.) A sensor is a device that takes input from the physical environment. Comprehensive and up-to-date question bank of mutiple choice objective practice questions and answers on Physics for Competitive Exams. 8-It is the time required to come to an output value within the specified error level. The instruments which add up the electrical quantity, i.e electrical energy and measure the total energy (in kilowatt hours) or the total Amper hours (in ampere-hours) supplied to a circuit in a given period are called integrating instruments. However, in more complex measurement situations, a measuring system consists of several separate elements as shown in Figure. The measurement sensor includes Solid State Detectors and Electronics – 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 = ˝ = ˝ = Si: Ei = 3.6 eV F = 0.1 Ge: Ei = 2.9 eV F = 0.1 Detectors with good efficiency for this Multiple choice questions. A pinoybix mcq, quiz and reviewers. Transducer - MCQs with answers Q1. 1-Which of the following is not covered under Mechanical energy domain? comes into action. 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. Household energy meter is an integrating instrument. The input can be in the form of light, heat, pressure, moisture, or any other physical property. 3-The sensors are classified on the basis of. Controlling Torque: With the help of the deflecting torque, the pointer deflection will take place on the calibrated scale but to stop the pointer at the definite position, controlling torque (Tc.) This known voltage is supplied by a standard cell or through a reference source. Show Explanation Is connected in parallel in a circuit and only part of the current to the measured flows through it. The Following Section consists Multiple Choice Questions on Logic Gates. In hot wire instrument, the sensing wire is made of. Now a day computer is one of the most important field for every examinations. A pointer of an instrument once deflected returns to zero position, when the current is removed due to. E ∝ L ⇒ E = φL The potential difference across a length of the potentiometer wire is directly proportional to its Length (or) when a steady current is passed through a uniform wire, potential drop per unit length or potential gradient is constant. Im = full-scale deflection current of ammeter = ? Medical Physics in questions and answers ~ 6 ~ Angle acceleration α of a rotating body equals to ratio of angle velocity ω and time t α = ω / t vector quantity; [α] = 1 rad.s-2 Centripetal force Fd force causing centripetal acceleration during motion on circle trajectory. Controlling torque is also known as restoring torque i.e., it brings back the pointer to its zero position when deflecting torque is withdrawn. (A) Hall Effect sensor MCQs on input and output devices (GK Objective Question Answer) exam question answer for competitive exam of govt jobs. Shunts are small resistances connected in parallel to increase the range of an ammeter. Chemical Effect Controlling Torque These instruments utilize the principle of expansion of wire, heat due to the current being measured, passing through the wire. However, in general, the primary sensor is only part of a measurement system. 13-A piezo-electrical crystal generates voltage when subjected to ____ force. This deflecting torque can be produced by any of this effects of current (or of voltage) such as. A deflecting torque is required to overcome the inertia, damping effect and controlling effect of the moving system. utting a large resistance in series with the actual measuring part of the instrument. Required fields are marked *. Sorry, you have Javascript Disabled! A resistance of 75 Ohms is connected in shunt of a galvanometer, having an internal resistance of 25 Ohms, to convert it into an ammeter. There is also a negligible thermoelectric effect when manganin is used with copper. 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. Ques.2. Hence ammeter is connected in series with the low resistance. Indicating instruments are instruments which indicate the magnitude of a quantity being measured. 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). a = m . Sensor is assumed to have a constant gain (linear approximation). Learn About Sensors & Transducers Objective Question. They generally make use of a dial and a pointer for this purpose. An ammeter measures the value of current flowing in the circuit, so current should flow inside ammeter to give proper result. Variable conversion elements:- They are needed where the output variable of a primary transducer is in an inconvenient form and has to be converted to a more convenient form. So In the case of longer wire, the fall of potential per unit length is small. Your email address will not be published. Function of transducer is to convert A. Ques.4. Explanation:- The electronic amplifier is a very common type of signal processing element. Integrating instruments record totalized events over a specified period of time. Passive: Does sensor draw energy from the signal ? The pointer attains a steady position when controlling torque becomes numerically equal to deflecting torque i.e., Tc = Td. Some examples of primary sensors are a liquid-in-glass thermometer, a thermocouple, and a strain gauge. Top 100 Sensors & Transducers Questions and Answers for Freshers : interview questions and answers for instrumentation and control engineering. 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. Basically, there are three types of Force or torque act upon the Measuring Instrument Once you have answered the questions, click on 'Submit Answers for Grading' to get your results. Answer.1. Example: The example of such an instrument is Recording voltmeters which are used in power stations to record the generated voltage. 5-The following main dynamic characteristic(s) is usually considered in Mechatronics application of sensors. The pointer attains a steady position when controlling torque becomes numerically equal to deflecting torque i.e., Tc = Td It is equal to the – product of mass m and centripetal acceleration ad, i.e. Is connected in parallel in a circuit and current to be measured flows through it, An ammeter is connected in series with the load, To measure current, you want most of the current to pass through it. However, in general, the primary sensor is only part of a measurement system. 7-It is the ability of the sensor to indicate the same output over a period of time for a constant input. The ear itself can be structured into three sections with the purpose to ... sensors causes frequency dispersion. 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 is a moving coil galvanometer in which a low resistance wire is connected in parallel. 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. 12-Following is (are) true for Hall Effect sensors. 2-Which of the following form the basis of Electrical domain? Instrumentation Engineering Objective Questions. In the above given example of thermocouple. comes into action. 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. This is especially undesirable if the number of readings to be taken is quite large. In other words, the potential gradient is small. The period is about 2s. Title: Slide 1 Answer.3. Ques.8. 171 . In some devices, signal processing is incorporated into a transducer, which is then known as a transmitter. 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. b) Digital vs. Analog: Is the signal discrete or continuous? Platinium-iridium Explanation:- II-Characteristics of different types of sensors a) Active vs. Sensors are characterized depending on the value of some of the parameters. What is the value of current (in A) flowing through the galvanometer, if the total current in the circuit is 5 A? The total energy of the electron in the hydrogen atom in the ground state is -13.6 eV. Answer.3. One B. Note that a transducer and a sensor are not the same. MULTIPLE CHOICE QUESTIONS WITH ANSWERS ON WIRELESS SENSOR NETWORKS 1. The secondary instruments may be classified as. Explanation:- 18-Inductive proximity sensors can be effective only when the objects are of _____ materials. Which of the following is its kinetic energy in the first excited state? Some examples of primary sensors are a liquid-in-glass thermometer, a thermocouple, and a strain gauge. 1. Rome (Headquarter) Via delle Quattro Fontane, 33 00184 Rome (RM) – Italy P.IVA - VAT: 05312981003 +39.06.4824033 info@mcqinst.com Mon – Fri: 9:00 – 18:00 We will add more questions soon. Rome (Headquarter) Via delle Quattro Fontane, 33 00184 Rome (RM) – Italy P.IVA - VAT: 05312981003 +39.06.4824033 info@mcqinst.com Mon – Fri: 9:00 – 18:00 Explanation:- Important characteristics of sensors and transducers are listed below: Input characteristics Transfer characteristics Output characteristics Input Characteristics of Sensors Range: It is the minimum and maximum value of physical variable that the sensor can sense or measure. Explanation:- Given below are top 10 MCQ Questions on Sensors and their working. A. Q8. Analog sensors theoretically have infinite resolution but is limited by noise. This activity contains 10 questions. 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. In some cases, the primary sensor and variable conversion element are combined, and the combination is known as a transducer. 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