Explanation:- Also, to reduce the surface tension and capillarity effects. Assuming generators and transmission network to be lossless, the system frequency for a load of 700 … Each question carries 1 point. Electrical signal into non electrical quantity B. In the figure, the pressure at the point above atmospheric pressure is: Low-temperature measurement: Thermocouples of Iron-constantan and copper constantan are used to measure temperature as low as 18 K and gold-platinum and silver platinum thermocouples are used to measure below 18 K with high accuracy. Answer.1. Between 1000°C and 1600°C Platonism Rhodium thermocouple is used. Low temperature: For measurements of low temperatures upto −250°C constant volume hydrogen thermometers are used and for measure merits below -250°C upto -270°C hydrogen is replaced by Helium. This is because any semiconductor will produce electron-hole pairs (EHP) when it is irradiated by electromagnetic radiation of the optical frequencies. Wide bandwidth and high accuracy are required. Reactive power Turbine inputs Generated voltage Turbine and generator ratings 3. Since the other end of the tube is open to atmosphere, the pressure obtained using the piezometer tube is gauge pressure. Usually a transducer converts a signal in one form of energy to a signal in another.. Transducers are often employed at the boundaries of automation, measurement, and control systems, where electrical signals are converted to and from other physical quantities (energy, force, torque, light, motion, position, etc. It can be linear or angular (rotational) motion. ). Liquid thermometer:- In electrical measuring instruments, electrical energy is converted to, Sensitivity of a voltmeter is given by the, Reciprocal of full scale deflection current, In the case of indicating instruments the function of the control spring is, To pass electric current to moving system. Strain Gauge Load Cell There are many form factors or packages to choose from—S-beam, pancake, donut or washer, plate or platform, bolt, link, miniature, cantilever, canister, load pin, rod end, and tank weighing. Narrow bandwidth and high accuracy are required. A solar cell or photovoltaic cell is a device that converts light energy into electrical energy. Transducers which require an external power source for their operation is called as a passive transducer. PA = whA Further, these transducers are classified into resistive, capacitive and inductive. 1) The instruments can be used for both a.c. and d.c. measurements. The corona loss in the transmission line can be reduced by increasing spacing between the conductors or the diameter of the conductors. Shear is induced by tension or compression along offset axes. Ques.65. The first is the world we live in which has sounds, pressures, temperatures, humidity and other things we may want to know more about, measure, etc. Which of the following is the best method for measurement of temperature of hot bodies radiating energy in visible spectrum ? Temperature Advantages of LVDT: When the length of the tube becomes longer, it cannot be handled conveniently. All semiconductors can be considered as photoconductors. 4) There is no current-carrying part; in the moving system hence these meters are extremely rugged and reliable. The power, connector and protocol for these EVSE will vary based on it design which we will discuss in this article. The resistive type mainly includes a thermistor, resistance strain gauge, and photoconductive cell. Piezoelectric ... You may also need. Which of the following quantities cannot be measured by a load cell? Piezometer tube Which of the following improves sound transmission from the transducer element into the tissue? the diameter of the tube must be at least 12 mm. Each question is worth 1 point) 1) An input transducer a) transforms a weak electrical signal into a strong one b) transforms a weak non-electrical signal into a strong one. Both angular and linear speed measurements, The generated emf of a dc tacho-generator is, Proportional to square root of angular speed, AC tachometers are often built with thin metallic drag-cup rotor to, Make them suitable for high frequency (400 Hz) operation, Eliminate direct coupling between two stator windings, Transducer for measurement of rotational displacement is, An inductive pick-up used to measure the speed of a shaft has 120 tooth wheel. 1. Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. The main electrical displacement transducers work on the principle of. Thermoelectric pyrometer The various advantages of moving iron instruments are. Acting as a secondary transducer, LVDT can be used as a device to measure force, weight & pressure etc. All of the given option are correct, LINEAR VARIABLE DIFFERENTIAL TRANSFORMER (LVDT). MCQ in Industrial Electronics Part 2 of the series as Electronics Engineering topic in ECE Board Exam. The transduction medium may be resistive, inductive or capacitive depends on the conversion process that how input transducer converts the input signal into resistance, inductance and capacitancerespectively. You need to score at-least 50% to pass the quiz i.e. Which one of the following statements is not correct ? Multiple-Choice Questions. Scintillation counters have the advantage(s) of, Capability of detecting of radiations of lower levels, Analog data acquisition system are used when. It is used to create an electrical signal whose magnitude is directly proportional to the force being measured. This transducer is also named as an externally power-driven transducer. They are sensitive to stray magnetic fields. Measurement of temperature using the thermometer High temperature: A mercury thermometer (boiling point of mercury is 357°C) can be used to measure temperature upto 300°C. Less friction: Since there is no sliding contact, the friction is very less. a Matching layer. Which one of the following pressure transducers is suitable for measurement of high pressure ? The electrical transducers used for continuous recording and control of humidity are, Measurements of flow, thermal conductivity and liquid level using thermistros make use of, In viscosity meters the quantity measured is, The function of the reference electrode in a pH meter is to, The method used for analysis of gases and their mixtures is called as, The disadvantage(s) of capacitor microphones is/are, The devices extensively used in sound measurement system are, A linear displacement digital transducer uses. Chapter 15 Multiple choice questions and answers. Various types of load cells include hydraulic load cells, pneumatic load cells, and strain gauge load cells. Synchros and resolvers: used to measure angular displacement c) converts a non-electrical information signal into an electrical form. Modern moving iron instruments have a d.c. an error of 2% or less. Answer.4. Very low pressure The tube is kept vertical and its other end is open to atmosphere. Need help preparing for your electrical exams? This type of manometer can only be used for measuring small and moderate pressures because as the pressure to be measured increases, the corresponding length of the piezometer tube required for measurement also increases. Which of the following bridges is used to measure power factor? Q98. Low temperature: as low as −30°C (freezing point of mercury is −39°C) can be measured using mercury and as low as -100°C can be measured by using alcohol (Remains liquid upto-130°C) in glass thermometers. II) Electrical Transducers. The transducers convert the physical forces into an electrical signal which can easily be handled and transmitted for measurement. The photoconductive materials most frequently used include cadmium sulfide (CdS) and cadmium selenide (CdSc). When stress is applied to a strain gauge, the resistance of the strain gauge changes and unbalances the Wheatstone bridge, resulting in a signal output (voltage) that is proportional to the stress. This is because any semiconductor will produce electron-hole pairs (EHP) when it is irradiated by electromagnetic radiation of the optical frequencies. Which of the following transducers is most suitable for monitoring continuous variations in very fine thickness of a material ? 1) The scale of the moving iron instruments is not uniform and is cramped at the lower end. Applications of LVDT Variable inductance: transducer is a linear variable differential transformer Variable capacitance: transducer is a parallel plate capacitor with a variable gap Synchros and resolvers: used to measure angular displacement Advantages of LVDT: B. The time required by an instrument to begin to respond to a change in the measurand, The time required by an instrument for initial warming up, The largest change of input quantity for which there is no output of the instrument, In resistance thermometers platinum is used because of, Low cost, high stability and wide operating range.
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