Consider the following transducers : 1. LVDT 2. Piezoelectric 3. Thermocouple 4. Photovoltaic cell 

Which of the above are active transducers ?

1 Answer

Answer :

Consider the following transducers : 1. LVDT 2. Piezoelectric 3. Thermocouple 4. Photovoltaic cell Which of the above are active transducers ?

2, 3 and 4

Related questions

Description : Give one application each of following transducer: (i) LVDT (ii) RVDT (iii) Capacitive (iv) Piezoelectric

Last Answer : i) LVDT ➢ LVDT used to measure force ➢ LVDT used to measure strain ➢ LVDT used to measure weight ➢ LVDT used to measure tension ➢ LVDT used to measure pressure ➢ The ... flow meters, non-destructive test (NDT) equipment's ➢ Piezoelectric materials are used in ultrasonic transducers.

Description : Which one of the following is not a transducer in the true sense?   (A) Thermocouple (B) Piezoelectric pick-up (C) Photo voltaic cell (D) LCD.

Last Answer : Which one of the following is not a transducer in the true sense?   (A) Thermocouple (B) Piezoelectric pick-up (C) Photo voltaic cell (D) LCD.

Description : Describe any four selection criterion of transducers.

Last Answer : 1. Operating range :Range is specified user or manufacturer 2. Operating principle : Depend on principle measurement 3. Sensitivity: it must sensitive to small variation in input. 4. ... 10. Stability and Reliability 11. Loading effect 12. Static characteristics 13. General selection criteria

Description : State two advantages of electrical transducers.

Last Answer : Advantages of electrical transducers- 1) The electrical systems can be controlled with a very small level of power. 2) The electrical output can be easily used, transmitted and processed for the ... can be indicated and recorded remotely from the sensing element. 4) Friction effect is minimized.

Description : Classify the temperature measuring transducers. 

Last Answer : 1.Expansion thermometers:  Bimetallic thermometers Bimetal Helix Thermometer Spiral Bimetallic thermometers  2. Filled system thermometers:  Liquid filled thermometers Gas filled ... Thermocouples  4. Pyrometers:  Radiation Pyrometers Infrared Pyrometers Optical Pyrometers

Description : The principle of operation used in capacitive transducers to measure level of liquid is change of (a) Area of plates (b) Dielectric strength (c) Distance between plates (d) Shape of plates

Last Answer : The principle of operation used in capacitive transducers to measure level of liquid is change of Dielectric strength

Description : Explain the construction and working of LVDT accelerometer with the help of diagram.

Last Answer : Explanation:* The LVDT accelerometer consists of one primary and two secondary windings which are placed on either side of central code. The two ends of the core are connected with ... in the output terminal. This output voltage is directly proportional to the vibration or acceleration. 

Description : Explain why LVDT gives a residual output at null position. State its 2 applications.

Last Answer : LVDT : Residual voltage may be on account of I/P supply voltage and also due to harmonics produced in the o/p voltage on account of use of iron core.  OR  An incomplete magnetic ... pressure is converted into a voltage. In these applications the high sensitivity of LVDTs is a major attraction.

Description : Draw and explain the displacement measurement system using LVDT.

Last Answer : (Or)  LVDT has a single primary winding P and two secondary windings S1 and S2 wound on a cylindrical former. S1 and S2 have equal number of turns and are ... while simultaneously reducing the voltage in the other winding. Output voltage Vo measured is equivalent to the displacement.

Description : State the working principle and specification of LVDT 

Last Answer : Diagram: A Linear Variable Differential Transformer (RLVDT) is an electromechanical transducer that provides a variable alternating current (AC) output voltage that is linearly proportional to the ... a secondary transducer it can be used as device to measure force, weight and pressure

Description : List any four drawbacks of LVDT.

Last Answer : Drawbacks of LVDT. 1. Large primary voltage produces distortion in output. 2. Temperature affects the performance. 3. Sensitive to stray magnetic field. 4. Large displacements are required for differential output 5. It has residual voltage

Description : Draw construction diagram of LVDT with label. Also state the application of LVDT. 

Last Answer : Application of LVDT 1) L.V.D.T as a primary transducer can be used for displacement measurement ranging from fraction of a mm to a few cm 2) Acting an secondary transducer, used to measure force, weight and pressure. 

Description : LVDT is a:  (1) Displacement transducer (3) Acceleration transducer (2) Velocity transducer (4) Pressure transducer

Last Answer : LVDT is a: Displacement transducer.

Description : List any two materials for Piezoelectric transducer.

Last Answer : i) Quartz crystal, ii) Barium titanete , iii) Rochelle salt , iv) Lithium Sulphate, v) Potassium Dihydrogen phosphate.

Description : What is piezoelectric effect? Name two piezoelectric material.

Last Answer : piezoelectric effect: Piezoelectric effect can be stated as follows: when a pressure or force or vibration is applied to crystalline material like quartz crystal or crystalline substances, then ... crystal: Quartz crystal ,Rochelle salt 2) Synthetic crystals : Barium Titanate, Lithium sulphate

Description :  What causes the piezoelectric effect?  a) heat or dissimilar metals b) pressure on a crystal c) water running on iron d) a magnetic field

Last Answer :  What causes the piezoelectric effect?  pressure on a crystal

Description : Explain with block diagram photovoltaic power generation.

Last Answer : Photovoltaic power generation:  Photovoltaic power generating system consists of following components: 1. Photovoltaic cell panel: Its function is to convert energy content of sunrays directly into DC ... . Step-up transformer: It step-up input voltage to utilization voltage e.g. 230V.

Description : What kind of energy is converted into light energy as a result of the action of light on a photovoltaic cell ?

Last Answer : Answer : The action of light on a photovoltaic cell results in the conversion of light energy into electrical energy.

Description : Why are photovoltaic cell are used to Provide the energy for all of these except?

Last Answer : Feel Free to Answer

Description : The device used to convert solar energy into electricity is – (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell

Last Answer : (1) Photovoltaic cell Explanation: Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.

Description : Write briefly about (a) Shock Waves (b) Sound Barrier (c) Solar Cell (d) Super Fluid (e) Tsunami (f) Photovoltaic Cell (g) Hygrometer

Last Answer : (a) Shock Waves In fluid dynamics, a shock wave is a nonlinear or discontinuous pressure wave. It can also be when the actual molecular or particle speed is moving faster than the wave ... . Evaporation from the bulb lowers the temperature so that this thermometer usually shows a lower temperature.

Description : What is the theoretical limit of the efficiency of a single-crystal single-junction cell in a photovoltaic system? w) 9 percent x) 29 percent y) 79 percent z) 99 percent

Last Answer : ANSWER: X -- 29 PERCENT

Description : The device used to convert solar energy into electricity is (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell

Last Answer : Photovoltaic cell

Description : State seeback effect. Describe the working of thermocouple.

Last Answer : Seebeck effect: Seebeck effect states that whenever two dissimilar metals are connected together to form two junctions out of which, one junction is subjected to high temperature and another is subjected to ... both the junctions a very low emf is produced which causes a current in the circuit. 

Description : State working principle of thermocouple.

Last Answer : Working principle of thermocouple. When heat is applied to junction (hot junction) of the two dissimilar metals, an emf is generated which can be measured at the other junction (cold junction). The two ... as a result of the generated emf. This current will continue to flow as long as T1>T2.

Description : List applications of thermocouple and thermistors.

Last Answer : Applications of Thermistors: 1. Widely used in the applications of the range from - 60oC to + 15oC. 2. Used as a sensor in liquid level, pressure, flow measurement systems. 3. Used for measurement ... 2. It is used for temperature measurement in cryogenic range. 3. It is used for flow measurement.

Description :  The use of thermocouple meters for AC measurement leads to a meterscale which is _____.

Last Answer :  The use of thermocouple meters for AC measurement leads to a meterscale which is square law.

Description : Principle of Thermocouple is based on :  (A) Thomson effect (C) Seebeck effect (B) Peltier effect (D) Kelvin effect

Last Answer :  The  principle is  based on Seebeck   effect.

Description : What are the applications of thermocouple?

Last Answer : Used  as  a  rectifier  instrument.

Description : Sensors are the transducers that are used to____. a.Measure physical quantity b.Hold the objects c.Fix the objects d.None of the above

Last Answer : a.Measure physical quantity

Description : Various oncogens may encode all of the following except: (A) Carcinogens (B) Growth factors (C) Receptors for growth factors (D) Signal transducers for growth factors

Last Answer : Answer : A

Description : G-proteins act as (A) Hormone carriers (B) Hormone receptors (C) Second messengers (D) Signal transducers

Last Answer : Answer : D

Description : Repeaters inside communications satellites are known as A. Trancievers B. Transponders C. Transducers D. TWT

Last Answer : B. Transponders

Description : Sensors are the transducers that are used to____. (A) Measure physical quantity (B) Hold the objects (C) Fix the objects (D) None of the above

Last Answer : A

Description : Peroxisomes and Glyoxisomes are (A) Energy transducers (B) Membrane-less organelles (C) Micro bodies (D) Basal bodies

Last Answer : (C) Micro bodies

Description : State the selection criteria for transducers

Last Answer : 1. Operating range 2. Operating principle 3. Sensitivity 4. Accuracy 5. Frequency response and resonant frequency 6. Errors 7. Environmental compatibility 8. Usage and ruggedness. 9. ... . 10. Stability and Reliability 11. Loading effect 12. Static characteristics 13. Noise immunity

Description : Define active and passive transducers. 

Last Answer : 1. Active Transducer: - These transducers do not need any external source of power for their operation. Therefore, they are also called as self-generating type transducers. The active ... need external source of power for their operation. So they are not self-generating type transducers. 

Description : Differentiate between active and passive transducers

Last Answer : Active Transducer:- A transducer which do not requires external energy source to convert signal from one form to another. Active transducers passes gain. e.g. Thermometer,Thermocuople, bourdon tubes, ... other form. Passive transducer passes loss. e.g. Thermistor, strain gauges, LVDT etc .

Description : Which of the following transducers can be used for non-contact temperature measurement? A) Resistance temperature detector B) Thermistor C) Sensistor D) Pyrometer 

Last Answer : Which of the following transducers can be used for non-contact temperature measurement? A) Resistance temperature detector B) Thermistor C) Sensistor D) Pyrometer 

Description :  Piezo-electric transducers are: -  a) passive transducers b) active transducers c) inverse transducer d) active and inverse transducers

Last Answer :  Piezo-electric transducers are: -  active and inverse transducers

Description :  Capacitive transducers are normally used for : -  a) static measurements b) dynamic measurements c) both static and dynamic measurements d) transient measurements

Last Answer : Capacitive transducers are normally used for : - dynamic measurements 

Description : What is residual voltage of lvdt?

Last Answer : Need answer

Description : LVDT used for displacement measurement is a/an __________ transducer. (A) Passive (B) Active (C) Capacitive (D) None of these

Last Answer : (A) Passive

Description : Drawand explain LVDT accelerometer.

Last Answer : Diagram: Explanation: The LVDT accelerometer consists of one primary and two secondary windings which are placed on either side of central code. The two ends of the core ... arises in the output terminal. This output voltage is directly proportional to the vibration or acceleration.

Description : Explain the working and principle of LVDT.

Last Answer : LVDT: Principle: The differential voltage of two secondary windings of a transformer is varied by positioning the iron core through an externally applied force. Working  When the pressure ... upon the position of the core which in turn depends upon the pressure fed inside the bellows.

Description : Sketch and describe the working principle of LVDT.

Last Answer : Diagram Explaintion: LVDT is the example of inductive transducer, in LVDT any physical displacement of the core cause the voltage of any secondary winding to increase while simultaneously reducing the ... winding and core varies the coupling between it and two secondary windings. .:E0=E1-E2

Description : Sketch and describe pressure measurement system for 800 mm pressure, that contain Bourdon tube and LVDT.

Last Answer : Diagram: Explanation: The pressure measurement using bourdon tube and LVDT is shown in above figure. In this the, the bourdon tube act as primary transducer and LVDT which follows ... This set up is used for measurement of pressure which is converted into electrical signal by LVDT.

Description : Draw and describe the constructional diagram of LVDT.

Last Answer : Construction of LVDT: A differential transducer consists of a primary winding and two secondary winding. The windings are arranged concentrically and next to each other. They are wound  over a ... winding and core varies the coupling between it and two secondary windings. E0=E1-E2

Description : Draw Bourdon tube with LVDT setup for pressure measurement.

Last Answer : Bourdon tube with LVDT setup for pressure measurement.

Description : Which is not the disadvantage of LVDT?  a) Relatively large displacement are required for appreciable differential output b) temperature affects the performances of transducer c) low hysteresis and ... limited mechanically by the mass of the core and electrically by the frequency of applied voltage

Last Answer : low hysteresis and electrical isolation