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What is a piezoelectric transducer used for?

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Description : Piezoelectric Transducer is used to measure  (1) displacement (2) resistance (3) current (4) temperature

Answer : Piezoelectric Transducer is used to measure displacement 

Description : List any two materials for Piezoelectric transducer.

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

Description : What is the difference between a sensor and a transducer?

Description : What is the role of a transducer?

Description : What is a transducer and how does it work?

Answer : An electronic device that converts one form of energy to another form.for example a transducer is used in microphone to convert speech signals to electrical signal.on the other hand,transducer is used to convert an electrical signal to speech signals in speakers.

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

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 : Define transducer. State factors which are considered while selecting transducer for a particular application.

Answer : Transducer - It converts one form of signal into another form. A transducer is a device that is used to convert a physical quantity into its corresponding electrical signal. ... compatibility : The transducer should maintain input and output characteristic for the selected environmental condition.

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.

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 : Define Analog Transducer and give examples of it

Answer : Analog Transducer: An analog transducer is a device that converts the input signal into a continuous DC signal of voltage or current. Examples: * Strain gauge * L.V.D.T * Thermocouple * Thermistor

Description : State principle of operation of piezo-electric transducer. State its application.

Answer : The piezoelectric element used for converting mechanical movement into electric signals. The mechanical deformation generates charges and this charge appears as a voltage across the electrodes.  ... destructive test (NDT) equipments 6. Piezoelectric materials are used in ultrasonic transducers. 

Description : Write example of each type (i) Primary transducer (ii) Active transducer (iii) Electrical transducer (iv) Digital transducer

Answer : (i) Active transducer:-Thermocouple, piezoelectric, photovoltaic cell (ii) Primary transducer:- Bourdon tube, bellows, (iii) Electrical transducer.:- LVDT,RVDT, Hall effect, strain gauge, ... , optical pyrometer, radiation pyrometer (iv) Digital transducer:- Linear Encoder, digital taco generator

Description : State the use of RADAR type level transducer & list two advantages.

Answer : Applications of radar type transducer: i) RADAR type level transducer is suitable for large tanks with range upto 200m for level measurement. ii) It is used for continuous level measurement. ... iii) Not affected by corrosive materials. iv) Can be used for hard to handle' applications.

Description : State the necessity of transducer.

Answer : Necessity of Transducer: Input quantity for most of the Instrumentation systems is non - electrical quantity. To convert non- electrical quantities like heat, pressure, level, flow rate, ... use electrical methods and techniques for measurement, manipulation and control, transducers are required.

Description : List four electric pressure transducer.

Answer : List of electric pressure measuring devices: 1. Diaphragm with strain gauge 2. Bourdon Tube with LVDT 3. Differential Pressure cell 4. Piezoelectric type pressure transducer 5. Capacitance pressure transducer 6. Optical Pressure transducer 7. Resistive pressure transducer 

Description : Define transducer. Give two examples.

Answer : Transducer - It converts one form of signal into another form. A transducer is a device that is used to convert a physical quantity into its corresponding electrical signal.  Classification - 1. Active transducer 2. Passive transducer 

Description : The transducer with negative temperature co-efficient of resistance is (A) Thermistor (B) Resistance Thermometer (C) Strain Gauge (D) Thermocouple

Answer : The transducer with negative temperature co-efficient of resistance is Thermistor

Description :  If the range of an analog transducer is 0 to 10 V, then for a resolution of 5 mV, the bits of ADC will be _____.

Answer :  If the range of an analog transducer is 0 to 10 V, then for a resolution of 5 mV, the bits of ADC will be 11.

Description : An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is (A) 0 to 2.76 (B) 0 to 9.81 (C) 0 to 11.20 (D) 0 to 52.10

Answer : An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is 0 to 2.76

Description : What is the Arduino Leonardo used for?

Description : What are digital signals used for?

Answer : Transformer coupled amplifiers Direct coupled amplifiers Multistage amplifiers Darlington amplifiers Emmiter follower

Description : Following transducer is an active transducer: (1) Carbon Microphone (2) Piezoelectric Microphone (3) LVDT (4) Strain Gauge 

Answer : Following transducer is an active transducer: Piezoelectric Microphone

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

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 : State working principle of piezoelectric transducer with diagram.

Answer : Working principle: When force or pressure is applied to the piezoelectric material like quartz crystal or barium titanate, then an e.m.f. is generated across the material or vice versa ... deformation generates a charges and this charges appears as a voltage across the electrodes.

Description : State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

Answer : The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc  ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

Description : State the material used for making (1) Magnetic Core (2) Fuse element  

Answer : The material used for making of:  (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel  (2) Fuse Element: Tin- lead wire, Tinned copper wire 

Description : List any four materials used for pattern making

Answer : The various types of materials used are as follows: 1. Wood 2. Metal. 3. Plastic. 4. Plaster. 5. Wax.

Description : State properties of conductor material used for overhead conductor. 

Answer : Following are the properties of conductor material:-   1. High conductivity :- Material should have high conductivity 2. High mechanical strength:- Material should have sufficiently high mechanical strength ... available & less costly. 9. Scrap Value: - Material should have high scrap value. 

Description : State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor 

Answer : Name the starters used for following motors : i) 3 H.P. 3-Ph squirrel cage I.M: i) DOL starter OR ii) Star-Delta Starter OR ii) Auto transformer starter OR iii) Soft start starter.  ii) D.C Shunt Motor : 1) Armature resistance starter (Three Point Starter) OR 2) Four Point Starter 

Description : Give the classification of the errors used in measuring instrument & state the reason for their occurrence.

Answer : Types of errors in measuring instruments:  A) Gross error: These are due to mistakes on the part of person using the instrument.  B) Systematic Error:  i) Instrumental Error: These ... multiplying factor.  C) Random error: These persist even after gross and systematic errors are removed. 

Description : Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

Answer : (i) Material used for Moving coil: Copper, Aluminum( some times)  (ii) Permanent magnets are made of special alloys such as :  Aluminum-Nickel-Cobalt (Alnicos)  Strontium-Iron  Neodymium-Iron-Boron  Samarium-Cobalt.

Description : State the material used for moving coil and former for PMMC instruments. 

Answer : Material Used for Moving Coil and Former for PMMC Instruments:  Material used for moving coil: Copper  Material used for Former: Aluminium

Description : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna

Answer : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna 

Description : Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer : Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Description : Permanent magnet moving coil instruments are used for

Answer : PMME are mostly used for measuring voltage and current.

Description : Taskbar is used for (A) Navigation program (B) Switching between program (C) Start a program (D) All of above

Answer : Taskbar is used for (A) Navigation program (B) Switching between program (C) Start a program (D) All of above

Description : A relay used for protection of motors against overload is :  (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay

Answer : A relay used for protection of motors against overload is : Thermal relay

Description : Earthing switch is used for?  (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above 

Answer : Earthing switch is used for?  (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above 

Description : As per Electricity Act, ____________means any line which is used for carrying electricity for any purpose.  (A) Electric line (B) Transmission line (C) All of the above (D) None of the above

Answer : As per Electricity Act, Electric line means any line which is used for carrying electricity for any purpose. 

Description : The motor used for electric traction is  (1) D.C. shunt motor (3) D.C. series motor  (2) D.C. compound motor (4) Synchronous motor

Answer : The motor used for electric traction is D.C. series motor

Description : A negative sequence relay is used for protection of  (1) Generator (3) Motor (2) Transformer (4) Long Transmission lines

Answer : A negative sequence relay is used for protection of Generator 

Description : Spot welding is used for (1) Thin metal (3) Castings only (2) Rough and irregular surface (4) Thick sections

Answer : Spot welding is used for Thin metal

Description : The electrode rod used for welding uses a coating on it 

Answer : The electrode rod used for welding uses a coating on it  to give a vapour to serve as a shielding gas to protect the weld area from atmospheric contamination and to provide slag to protect the welded area

Description : Peterson coil is used for :  (A) shunt compensation of lines (B) grounding of system neutral (B) reduce fault currents (D) connecting interconnected systems

Answer : Peterson coil is used for : grounding of system neutral

Description : Which of the following is used for thermoelectric cooling? A) Peltier effect B) Seebeck effect C) Both A and B D) None of these

Answer : Which of the following is used for thermoelectric cooling? A) Peltier effect B) Seebeck effect C) Both A and B D) None of these

Description : Phantom loading for testing of energy meter is used (A) to isolate the current and potential circuits (B) to increase power loss during testing (C) for meters having low current ratings (D) to test meters having a large current rating for which loads may not be available

Answer : B

Description : Eddy current damping cannot be used for moving iron instrument because

Answer : Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

Description : Regulating-transformers are used in power systems for control of

Answer : Regulating-transformers are used in power systems for control of power flow

Description : Surge absorbers are used for protection against

Answer : Surge absorbers are used for protection against low voltage high frequency oscillations

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