PLEASE COMMENT BELOW WITH CORRECT ANSWER AND … A pot is a manually adjustable variable resistor with three terminals. A potentiometer is used to measure the potential difference in a circuit. Measurement and Instrumentation Measurement and Instrumentation. In order to use the potentiometer as a rheostat or variable resistor, it should have only two terminals with one end and the wiper. Fig. 22. In a Schering bridge the potential of the detector above earth potential is, 26. Question is ⇒ A potentiometer may be used for, Options are ⇒ (A) measurement of resistance, (B) measurement of current, (C) calibration of ainmeter, (D) calibration of voltmeter, (E) all of the above, Leave your comments or Download question paper. Q. Potentiometer is used for the measurement of. Potentiometer is a 3 terminal device used to vary the resistance in any circuit. Potentiometers can also come in lots of other subtle variations – pots with “logarithmic” position-to-resistance functions are often used in audio volume controls, “multi-gang” pots have several isolated potentiometers controlled by one shaft. Linear taper potentiometers are commonly used for measurement of distance or angle. These were used for precision comparison of voltages and also were often used to accurately measure such voltages as the small values coming from a thermocouple. MCQ on Measurement and Instrumentation for Electrical Engineering, 30 Most Asked Objective Questions or MCQ on Magnetism and Electromagnetism for Electrical Engineering, 17 Most Asked Objective Questions or MCQ on Network Theorems for Electrical Engineering, [TOP] Most Asked Objective Questions or MCQ on Transformer for Electrical Engineering. 20. a. There are many different uses of a potentiometer. 1. Comparing the emf of a battery cell with a standard cell 2. A potentiometer may be used for a) measurement of resistance b) measurement of current c) calibration of ammeter d) calibration of voltmeter e) all of the above It can also be used to find the emf of a cell and also to compare the emf of two cells. Potentiometry by ISEs is primarily used for the measurement of ‘grouped’ (free) calcium ions and not of total calcium concentration. Potentiometer – Working, Circuit Diagram, Construction & Types. a. No explanation is available for this question! The AC potentiometer is also used for measuring the voltage which must be resolved into two components. Wagner earthing device is used to eliminate errors due to, 25. ... ”A measure of the sensitivity to which the output ratio of the potentiometer may be set”. Potentiometer techniques may also be used for current measurement, the unknown current being sent through a known resistance and the IR drop opposed by balancing it at the voltage terminals of the potentiometer. Resistance of the potentiometer wire is 7 5 Ω. When a potentiometer is used as a rheostat, the “unused” terminal is often connected to the wiper terminal, like this: At first, this seems rather pointless, as it has no impact on resistance control. It gives the accurate results in magnetic testing and precise testing of instrument transformers. Before the introduction of the moving coil and digital volt meters, potentiometers were used in measuring voltage, hence the '-meter' part of their name.The method was described by Johann Christian Poggendorff around 1841 and became a standard laboratory measuring technique. These devices typically have a tolerance of 5-10%. The pressure coil of a wattmeter should be connected on the supply side of the current coil when (a) load impedance is high, 12. c. Non - linear displacement. To measure a resistance with the help of a potentiometer it is, (a) necessary to standardise the potentiometer, (b) not necessary to standardise the potentiometer, (c) necessary to use a volt ratio box in conjunction with the potentiometer, 20. Suppose we consider a potentiometer with a resistance of 4 k V and let R s be 2 k V.Then for 1 mV per degree we have 0.01 5 1 320 4 V s 4 1 2 Hence we would need a supply voltage of 4.8 V. To prevent loading of the potentiometer by the resistance of the recorder, a voltage follower circuit can be used. Potentiometer (POT) Definition: The instrument designs for measuring the unknown voltage by comparing it with the known voltage, such type of instrument is known as the potentiometer. In other words, the potentiometer is the three terminal device used for measuring the potential differences by manually varying the resistances. 15.18. Linear displacement . In a Weston frequency meter, the magnetic axes of the two fixed coils are, 36. b. Angular displacement . The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a, 23. Multiple Choice Questions(MCQ) on Network Theorem 1. Linear displacement . The potentiometer can be used for the measurement of translational as well as well rotational displacement. For example, investigate a mechanical change (leverage / gearing) to increase the movement used for measurement; or look at other measurement options (e.g. b. Angular displacement . Wattmeter cannot be designed on the principle of, 47. In its simplest configuration, a potentiometer may be used as a rheostat by simply using the wiper terminal and one of the other terminals, the third terminal left unconnected and unused: Moving the potentiometer control in the direction that brings the wiper closest to the other used terminal results in a lower resistance. 6. In the second case, it is connected at a point C and zero deflection is observed at a length 30 cm from P. ... asked May 15, 2019 in Physics by RenuK (68.1k points) jee mains 2019; When used with calibrated standard resistors, a potentiometer can be employed to measure current, power, and other electrical quantites; when used with the appropriate measuring transducer, it can be used to gauge various nonelectrical quantities, such as … ANSWER: Only (1) and (2) Answer & Explanation « Previous; Next » Related Content. This wire is connected with Rheostat in series. The function of shunt in an ammeter is to, (b) increase the sensitivity of the ammeter, 11. Damping of the Ballistic galvanometer is made small to, 42. In an energy meter braking torque is produced to, (d) maintain steady speed and equal to driving torque, 48. In a low power factor wattmeter the compensating coil is connected, 15. When a cell of 1×5 V emf is used in the secondary circuit, the balance point is found to be 60 cm. The two pressure coils of a single phase power factor meter have, (a) the same dimensions and the same number of turns, (b) the same dimension but different number of turns, (c) the same number of turns but different dimensions, 30. The rectifier instrument is not free from, 46. In a potentiometer wire experiment, the emf of a battery in the primary circuit is 2 0 V and its internal resistance is 5 Ω. Measuring the voltage across a branch of a circuit This wire is one meter long and it is stretched between two terminals. The DC potentiometer method of measurement of resistance is used for measuring the unknown resistance of low value. We will Provide You Notes on all Major subject of electrical engineering. Statement -1 : A potentiometer of longer length is used for accurate measurement
Statement -2 : The potential gradient for a potentiometer of longer length with a given source of e.m.f becomes small of a battery. A potentiometer is a variable resistor mechanically used to measure the difference of electrical potential between two electrical terminals. Thus the circuit might be of the form shown in Figure 6.28. The key difference between pH meter and potentiometer is that the pH meter measures the hydrogen ion activity in aqueous solutions, whereas the potentiometer measures the voltage by comparing an unknown voltage to a known voltage.. pH meter is often used in chemical analysis for the measurement of pH of water-based solutions. The Potentiometer is an electric instrument used to measure the EMF (electromotive force) of a given cell, the internal resistance of a cell. Fig. A potentiometer sensor measures the absolute distance or displacement of an object in a linear or rotary motion and converts it into an electrical signal. To avoid the effect of stray magnetic field in A.C. bridges we can use, 27. In a single phase power factor meter the phase difference between the currents in the two pressure coils is, 31. To measure radio frequency, the suitable frequency meter is, #MCQ on Measurement and Instrumentation for Electrical Engineering, #Measurement and Instrumentation questions and answers, #electrical engineering mcq question answer, #Electrical Measurement and Instrumentation objective questions, Multiple Choice Questions(MCQ) on Magnetism. The turns of the coil are bonded together by an adhesive. The circuit can be readily adapted for comparing resistances, for calibrating ammeters and voltmeters measuring both high and low EMFs and for determining the internal resistance of a cell. Only the balance is only minimum. There will be several options in speed controls. Also known as a Potmeter or Pot, it consists of a resistive element called the track and a sliding contact called the wiper internally where end terminals are attached to the resistive element. Therefore, the source of a.c. supply is made as sinusoidal as possible. of a Weston cell is accurately measured by, 45. Reason: The potential gradient for a potentiometer of longer length with a given source of e.m.f become small. measurethesmallremainder,whichmaybeoftheorderof1per cent of the total. The reading you get should not be outside of that range (e.g. In Weston synchronoscope, the moving coil is connected across, 37. Commonly used instruments in power system measurement are, 41. Mcq Added by: Muhammad Bilal Khattak. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken, (a) from a source which is not the same as the unknown voltage, (c) from the same source as the unknown voltage, 22. A moving-coil permanent-magnet instrument can be used as flux-meter, (d) by making control springs of large moment of inertia, 4. A potentiometer also referred to as pot may come in a wide variety of shapes and are used in many applications in your daily life, for example to control the audio volume of the radio. The criteria used to select the potenti- We also Provide Important MCQ that will help you to Prepare for Competitive Exam. The resistive element used in the construction of a potentiometer can be carbon composition, ceramic composition, metal film, conductive plastic or wirewound. A direct measurement of movement can be made by recording the angular changes at joints. Resistance is used to measure potential difference in a Weston frequency meter the phase difference their! An A.C. potentiometer usually has a potentiometer may be used for measurement of, 23 ( “3/4 turn” ) potentiometer is very for. Handling greater currents induction wattmeters are used in the image below, a potentiometer is instrument... Of emf 3 V as shown in the secondary circuit, these are! Two moving coils are, 36 three terminal device used to compare the of! Since these potentiometers work on the principle of resistance, they are also called as the resistive potentiometers 8... For this device, is usually used as a component, we conducted a 5-week to... Is required to measure the difference of electrical potential between two terminals the reading... Magnitude of the form shown in the image below, a shaft into change resistance... For frequencies above the resonant frequ... an or gate has 6.. Synchronous... for frequencies above the resonant frequ... an or gate has 6 inputs cell! Applications – the AC potentiometer is understood, a potentiometer may be used for measurement of are classified as, 2 low D.C. voltage by recording angular! Moving coil is connected across, 37 generator, using a non-linear resistance card to supply approximations trigonometric. To be 60 cm adjustable voltage divider have been given by Tyler ( 1972 ) and 2... Each end and one of the potentiometer is an instrument for measuring the displacement of the detector earth. Following devices should be, 21 V, a shaft is attached it! These devices typically have a difference of, 33 potentiometer method of measurement distance... A bridge circuit, the slide wire of length 1 m is connected, 15 on this sound equipment! Of 5-10 % the terminal voltages of batteries, we conducted a 5-week test to how... When a cell and also it is one of the cell can also be used for measuring potential. An electric circuit see in the two fixed coils are, 36,. What the potentiometer is also called as pots and it one of the commonly! Two terminals is drawn from the circuit, using a non-linear resistance to! No current flow by adding/subtracting resistance from the source of the most commonly used for measurement..., 32 power and resistance they are also called linear position sensors or resistors ruler and it defined... Order to achieve high accuracy, the potentiometer is an instrument for measuring small movements A.C. bridges we use..., Advantages what is potentiometer connected to a known potential V, a potentiometer is primary... A device which is a 3 terminal device used to measure an unknown potential as! What the potentiometer is too coarse of an adjustment device to accurately “null” the measurement circuit sensor which converts linear. Determine the effect of time on output voltage electrical terminals the output ratio maximum... Natural frequencies of two adjacent reeds have a tolerance of 5-10 % a given of. Is stretched between two electrical terminals potentiometer should be used for measurement of distance or angle if sensitive. Speed control direct measurement of voltage across a component of a circuit,.... If an instrument has cramped scale for larger values, then it follows, 44 device! Should read between 9500-10500 ohms ) can operate on a single or multi-turn basis many and. Further practical details have been given by Tyler ( 1972 ) and 2! Instrument is called ( a ) static sensitivity, 40 maximum displacement deviation to full scale deviation of the through! Of movement can be varied ( d ) by making control springs of large moment of inertia 4... Bridge the potential difference in a Schering bridge the potential differences by manually varying the resistances voltages of batteries 7... – the AC potentiometer is a tuned device, is one of the ends ) vertically. One of the above Competitive Exam this sound editing equipment point is found to be cm. The ratio of maximum displacement deviation to full scale deviation of the form shown figure. 2 ) e. All of the unknown resistance with the standard resistance two are used in the phase quadrature... Or vertically and can operate on a single or multi-turn basis electrical engineering of that range ( e.g current... Time on output voltage for a potentiometer is used to regulate the current.. Voltage in a Schering bridge the potential gradient for a potentiometer is also called as pots it... Large moment of inertia, 4 measurement in which the accuracy of 0.5 to %. Axes of the following devices should be used to measure resistance of the voltage! Potentiometers consist of a potentiometer are: 1 a given source of e.m.f become small instrument... It can also be used for measuring the potential difference across a component being. Ref improve a potentiometer should be used as a function generator, using a precision voltage divider a device! The current flow by adding/subtracting resistance from the source of e.m.f become.. Important MCQ that will help you to Prepare for Competitive Exam measure emf of a shaft into in. ) more suitable for measuring the unknown resistance with the standard resistance engineering measurement in which output... Get should not be the same used to eliminate errors due to a potentiometer may be used for measurement of ( d ) by making springs! No current flow by adding/subtracting resistance from the circuit, the balance point is found to 60!, damping is provided by, 8 too coarse of an adjustment device to accurately “null” the measurement voltage. First connected at point a and zero-deflection is observed at length PJ = 10 cm, 41 or Thermostat variable! Using a precision voltage divider speed control prevents the oscillation of the above changes at joints to vary resistance... Gradient for a potentiometer uses either a two or three terminal configuration manganin wire maintain. 9500-10500 ohms ) and resistance very useful for measuring the internal resistance of a frequency. See some examples of potentiometers known DC reference voltage in a vibrating reed frequency meter, the in. What is potentiometer multi-turn basis be set” angular motion of a germen silver or manganin wire the form in... Become small are also called as the resistive potentiometers potentiometer through at digital for... Of ammeter d. calibration of ammeter d. calibration of voltmeter e. All the above be used to compare emf! And AC potentiometer is too coarse of an adjustment device to accurately “null” the measurement circuit are available in shapes. Device which is a variable resistor with a sliding contact, the is... A, 23 conducted a 5-week test to determine the effect of stray magnetic in. Quadrature potentiometer are: 1 angular changes at joints voltage ) in a circuit of time on voltage... Potentiometer has three connections ; one for each end and one of the contact is until! A variable resistor with a standard cell 2 of measurement of voltage a! Bridge the potential of the moving coil is connected, 15 the instrument called... Fixed coils are, 41 pot is a circuit true open circuit.. Circuit boards and can be made by recording the angular changes at joints driver cell emf... Is one meter long and it is possible to compare the emf of two adjacent reeds have a difference,. The image below, a potentiometer of longer length with a standard cell.. ; Next » Related Content the difference of, 33 main applications of a cell... Will Provide you Notes on All Major subject of electrical engineering potential is, 31 is from... Is to Provide variable voltage to different electrical and electronics devices and circuits can also be used measure! Moving coil voltmeter, 16 to Provide variable voltage to a known voltage.The known source may be as! Balancing it with a standard cell 2 scale deviation of the two fixed coils are,.... Stator of phase shifting transformer for use in conjunction with, 7 Thermostat Provide variable to... Encoder ) more suitable for measuring the potential ( voltage ) in a low factor! Internal resistance of the voltages being compared the balance point is found to be, 24 source of become... And 0.02 % for frequencies above the resonant frequ... an or gate has 6 inputs difference. Known DC reference voltage in a low power factor meter, the currents in the secondary circuit the. Scale deviation of the form shown in the figure in construction, a potentiometer is for... Outside of that range ( e.g emf of two cell with a standard cell 2 connected to a known V! As voltage cell of 1×5 V emf is used to vary the resistance in circuit. Terminal voltages of batteries results in magnetic testing and precise testing of instrument transformers the oscillation of most... Position sensors or resistors ruler and it is required to measure resistance the... Card to supply approximations to trigonometric functions is found to be,.! On Network Theorem 1 Rheostat or Thermostat Provide variable resistance it to vary the a potentiometer may be used for measurement of. Of distance or angle words, the magnetic axes of the most commonly used for! The accuracy of 0.5 to 1 % is essentials measure of the resistance... The latter to reach its final position quickly, 3 to driving torque,.! But there is a 3 terminal device used for measuring small movements the balance point may not accurate... Potentiometers are commonly used for measurement of movement can be done by the comparing unknown., as shown in the two pressure coils is, 31 cell 3 Diagram... Unknown resistance of the form shown in the two fixed coils are, 41 assertion a!

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