b. 103) The heater wire of thermocouple instruments are made of smaller area of cross section to. This might be a change in the electrical conductivity/resistance, or perhaps just the mechanical displacement of a lever which i… There is a different range of products available in the market which use sensors like weight measuring devices, used for designing an entire weighing system. 1.1 INTRODUCTION pH is a measure of the relative amount of hydrogen and hydroxide ions in an aqueous solution. This is normally done with the help of differential equations. Analog transducers outputs are continuous functions of time. It is obtained by multiplying the g-coefficient by young’s modulus valid for the appropriate crystal orientation of the material, and thus measures the e.m.f gradient per unit mechanical deformation, or (V/m) / (m/m ). ECG B. B. 4. The sensors send signals that it uses to detect the level of the liquid. It is used avoid the fluctuation, we need dynamic compensation circuits for the hotwire anemometer. All Rights Reserved. The unit of mass is represented by a material standard: the mass of International prototype kilogram consisting of platinum Iridium hollow cylinder. A voltage sensor is a sensor is used to calculate and monitor the amount of voltagein an object. Q55. In these transducers self-inductance or the mutual of a couple of coils is changed when the quantity to be measured is varied. The permeability can increase or decrease depending upon the material, type of stress , and the magnetic flux density in the sample. Another common version of the variable reluctance principle. To eliminate the demodulator the iron core and springs were adjusted so that core was offset to one side by an amount equal to the spring deflection corresponding to 4 g acceleration. Answer ⇓ C 6. Working Of Hot Wire Instrument. 1) In a moving coil voltmeter, the input resistance of the meter can be increased by a. nearly as common as pH, certain industries make valuable use of the measurement. It is an electrical device or sensor used to measure temperature. Electrical and Electronics Measurement & Instrumentation Expected MCQ PDF 8 For VIZAG Exam 2017. ANSWER: Hot body----Thermocouple-----Amplifier and converter-----Display system . Point level measurement sensors are used for the purpose of marking a single liquid height or for presetting a level condition. The resistance element is usually more expensive than a thermocouple. These transducers convert the input quantity into an analog output which is a continuous function of time. Feedback type capacitance proximity pickup, Change in the distance between the plates d, The metallic parts of the capacitive transducers must be insulated from each other. Leave a Comment / Uncategorized / By Ajay Sharma. If the internal. The amplitude of this output voltage varies with the mutual inductance between the two coils and this varies with the angle of rotation. Evaluation kit for the single-use liquid flow sensor LD20-2600B . It works on the principle of transfer of heat from high temperature to low temperature. Temperature affects the performance of the transducer. a. (b) thermal radiations. Previous Previous post: MCQ ON ENGINE TESTING AND PERFORMANCE. In the absence of external power, transducer cannot work and it is called a passive transducer. 200 ± 2%. This is common in North American residential applications, where one 240 V and two 120V supplies are … It is used avoid the fluctuation, we need dynamic compensation circuits for the hotwire anemometer. Thermal anemometers, or hot wire flow sensors, measure the flow rate by monitoring the amount of heat removed from a surface using one or more simple temperature sensors.They have found wide use in the automotive industry for monitoring the air intake of the engine. WhenV =1, the second order system is said to be critical damped and when V >1 , the second – order system is said to be over damped. Intensity of light increases with distance; Intensity of light decreases with distance; Intensity of light remains constant with distance; Intensity of light increases with time; Ans. This is the Multiples Choice Questions Part 2 of the Series in Tests and Measurements as one of the Electronics Engineering topic. The hot wire anemometer consists two main parts. Mass Airflow Sensor (MAF) The mass airflow sensor measures the air flowing into your engine. Rigidity is especially important for multi-sensor measurements where the algorithms used for data reduction assume a straight sensor. Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. Hence, picking one that’s easily connectable, accurate, and reliable is very much important for fulfilling your intended usages. 102) In a Wheatstone bridge, if P = 10 ± 1%, Q = 100 ± 1%, R = 20 ± 1% and S is unknown then the unknown resistance will be. Hot Wire Air Flow Meter Hotwire air flow meters use a hot wire mass airflow sensor to measure the flow rate of air. Q. Explanation: No explanation is available for this question! A. Measurement and Instrumentation introduces undergraduate engineering students to the measurement principles and the range of sensors and instruments that are used for measuring physical variables. Resistance thermometer bridges may be excited with either d.c.or a.c .The direct or rms alternating current through the thermometer is usually in the range of 2 to 20 mA. Hot Wire Anemometers also known as hot wire flow sensors measure flow rate of air by sensing the amount of heat that is removed from the surface of an element using a single sensor or an array of sensors.A very common use within the automotive industry is to use a hot wire anemometer to monitor the air intake of an engine. d. 100 ± 1%. b. Back in the day, the ventilators would have used an aneroid manometer to measure circuit pressure, which was a hideous thing to behold. This function of an ultrasonic water level sensor can be used to control the flow rate in an industrial process. Test Set - 4 - Electrical Measurements & Units - The test carries questions on topics such as Ammeters and voltmeters theory, Electrodynamic instruments, Hot-wire instruments, Megger, Induction type instruments, Kelvin’s multicellular voltmeter etc. Thus, its service life tends to be longer as compared to traditional sensors! (D) none of the above. Education 7; … At 25°C fewer … Types of proximity sensor. The red wire is the excitation wire and the black or white wires are ground wires. When the current to be measured passes through the hot wire, the wire gets heated and then expands. Q20. Bolometers are used for the measurement of. The specification of limiting error is in itself uncertain because the manufacture himself is not sure about the accuracy because of the presence of random errors. Sphygmo-manometer C. Instrument used for measuring blood pressure You will often find the air mass sensor attached to your air filter box. The span of the transducer is specified as the difference between the higher and lower limits of recommended input values. The Linear Variable Differential Transformer (LVDT) is the most common mutual inductance element. The primary is excited with alternating current. Ammeters And Voltmeters Theory - 6 - MCQs with answers, Measurement of Resistance - 2 - MCQs with answers, Measurement of Resistance - 1 - MCQs with answers, Essentials Of Indicating Instrument - 1 - MCQs with answers, Instrument Transformers - MCQs with answers, Display Devices and Signal Generators - MCQs with answers, Electronic Instruments - MCQs with answers, Special Purpose Measuring Instruments - MCQs with answers, Wattmeter Theory And Measurement of Power - 3 - MCQs, Power Systems - Switchgear and Protection, passive transducers used external power...active not. c. 200 ± 3%. Now that we’ve … The damping ratio V is an important parameter which decides the nature of oscillation in the transducer output. Download hot wire sensor measurement Thermometrics offers one of the most comprehensive ranges of temperature measurement and sensing products in the world today. Standard Test Signals – Test. It often uses a hot wire that is cooled by the airflow, then converts the resistance into air mass flow and transmits the information to the engine control unit. Linearity is a measure of the maximum deviation of the plotted transducer response from a specified straight line. The newest sensors—called hot film anemometers—integrate several heating and temperature measurement resistors on a wafer-thin … (A) Have to be machined and fit with other mating components ... Answer A. MCQ No - 2. While ultrasonic and radar level sensors can measure your level to give specific feedback to how much of product is in a tank. 5. Explore our entire product range of measuring instruments in the fields of automatic weather stations (measuring temperature, humidity, air pressure, precipitation, wind / flow, radiation and lightning), mobile and stationary road weather and runway sensors, cloud height sensors / ceilometers and snow depth sensors. This induces a voltage in to the secondary. Time to reach equilibrium conditions = 5t = 10s. This transducer converts input quantity into an analog output which is a continuous function of time. A. When the input to a transducer is increased from zero, there is a minimum value below which no output can be detected . These are due to conditions in the measuring device, including conditions in the area surrounding the instrument, such as the effects of changes in temperature,humidity. Q54. There are errors due to self-heating and thermoelectric effect of theresistive element and connecting leads (dissimilar metal junctions). we have an article for electronics and instrumentation graduates for preparing the interviews. When the input to a transducer is increased slowly from some non-zero arbitrary value, the change in output is not detected at all until a certain input increment is exceeded. A device which converts an electrical quantity into a non-electrical quantity. Basically a resistance potentiometer, or simply a POT, (a resistive potentiometer used for the purposes of voltage division is called a POT) consists of a resistive element provided with a sliding contact. This can be considered to be a versatile transducer element for most of the electromechanical measuring systems with regards to resolution, hysteresis, dynamic response, temperature characteristics, linearity and life. Implementation of voltage sensor and current sensor techniques have become an excell… This minimum value of the input is defined as the threshold of the transducer. They convert pressure or force into electrical charge. (D) thermocouple voltmeter. Voltage sensors can determine both the AC voltage or DC voltage level. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam.