Electrical & Electronics Measurement & Instrumentation Test Questions. Multiple Choice Questions (MCQ) on Transformer for Electrical Engineering In This Post, we are going to share Multiple Choice Questions ... ElectricalNotes4u is a Blog for Electrical Engineering Students who want to learn Electrical Engineering online. 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. Wagner earthing device is used to eliminate errors due to, 25. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a, 23. Typical values for independent linearity nowadays lie between 0.2 % and 0.02 %. In the figure below you can see some examples of potentiometers. When a cell of 1×5 V emf is used in the secondary circuit, the balance point is found to be 60 cm. The potentiometer is used as the cold junction, and its temperature is estimated to be 83 F. Calculate the emf indicated by the potentiometer. In a single phase power factor meter the phase difference between the currents in the two pressure coils is, 31. Mostly used to regulate the current flow by adding/subtracting resistance from the circuit, these resistors are available in many shapes and sizes. a. In Weston synchronoscope, the moving coil is connected across, 37. Mcq Added by: Muhammad Bilal Khattak. There is a resistance box in series with the battery and the potentiometer wire, whose resistance can be varied from 1 2 0 Ω to 1 7 0 Ω. Assertion: A potentiometer of longer length is used for accurate measurement. c. Non - linear displacement. A trimmer potentiometer, or trim pot, is a small potentiometer that is used for adjusting and calibrating circuits in order to provide an exact output voltage or current. The voltage drop across the known and unknown resistance is measured and by comparison the value of known resistance is determined a 10,000 ohm device rated 5% should read between 9500-10500 ohms). The turns of the coil are bonded together by an adhesive. For this device, only two are used (the middle one and one of the ends). In order to use the potentiometer as a rheostat or variable resistor, it should have only two terminals with one end and the wiper. A multi-turn potentiometer may be used instead of the single-turn unit for greater adjustment precision, or the “precision potentiometer” circuit described in an earlier experiment may be used. Commonly used instruments in power system measurement are, 41. Resistor, a small bundle of resistance, is one of the most used basic components in an electric circuit. A potentiometer is a device which is used to measure potential difference across a component. In order to achieve high accuracy, the slide wire of a potentiometer should be, 21. 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. Potentiometer is a primary sensor which converts the linear motion or the angular motion of a shaft into change in resistance. Velocity and acceleration can be obtained by differentiation. They have a small shaft on top that functions like a knob; when the user turns the shaft, it turns the resistance on the signal up or down. The armature current of the synchronous ... For frequencies above the resonant frequ... An OR gate has 6 inputs. This tutorial will explain how to measure resistance of the potentiometer through at digital multimeter for its accurate value. A motor-driven potentiometer may be used as a function generator, using a non-linear resistance card to supply approximations to trigonometric functions. A single measurement components may have both random errors and systematic errors A measurement system consists of several components with each component having separate errors Both the statement (1) & (2) are true We also Provide Important MCQ that will help you to Prepare for Competitive Exam. Q. Potentiometer is used for the measurement of. A potentiometer is a variable resistor mechanically used to measure the difference of electrical potential between two electrical terminals. They are also commonly used for voltage division. 20. 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. In principle a variable resistor may be used in two different ways with respect to the load: As a parallel resistor, i.e., a voltage divider or potentiometer, and a series resistor or rheostat, i.e., a type of current regulator. A vibration galvanometer, which is a tuned device, is usually used as a detector in a.c potentiometer. c. Non - linear displacement. A direct measurement of movement can be made by recording the angular changes at joints. Fig. 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. Reason: The potential gradient for a potentiometer of longer length with a given source of e.m.f become small. Tolerance may be listed on the device but not always. This wire is one meter long and it is stretched between two terminals. 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 b. Angular displacement . 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. a. © Copyright 2020. measurement when the potentiometer is held in a given position for long periods (>102 hr). According to application, instruments are classified as, 2. In a low power factor wattmeter the pressure coil is connected, (a) to the supply side of the current coil, (c) in any of the two meters at connection, 13. No explanation is available for this question! Important Performance Parameters of the Potentiometers \$\begingroup\$ @AACES - Hi, I recommend you take a step back & consider other options as well, if you are only considering using a potentiometer rotating 2 degrees. All Rights Reserved. If an inductance is connected in one arm of bridge and resistances in the remaining three arms, (c) the bridge can be balanced if the resistances have some specific values, (a) one current circuit and two pressure circuits, (b) one current circuit and one pressure circuit, (c) two current circuits and one pres¬sure circuit, 29. Measuring the voltage across a branch of a circuit For handling greater currents induction wattmeters are used in conjunction with, 7. In construction, a potentiometer uses either a two or three terminal configuration. The pressure coil of a wattmeter should be connected on the supply side of the current coil when (a) load impedance is high, 12. The AC potentiometer is also used for measuring the voltage which must be resolved into two components. Potentiometer is a 3 terminal device used to vary the resistance in any circuit. There are many different uses of a potentiometer. Resistance of the potentiometer wire is 7 5 Ω. Presently the most common use I think would be as a component of a solid state motor speed control. Play this game to review Circuits. A potentiometer may be used for_____? In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of, 33. Q. Potentiometer is used for the measurement of. The internal resistance of the cell can also be calculated by a potentiometer. A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly, 3. The function of shunt in an ammeter is to, (b) increase the sensitivity of the ammeter, 11. Linear displacement . The best device is, 17. 22. 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 Ans: e. 21 is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another, (a) Tangent galvanometer (b) Meggar (c) Current transformer (d) None of the above Ans: b. 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. 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. A potentiometer is also used for the measurement of voltage across a resistive element of a circuit. Trim pots are directly mounted onto circuit boards and can be set horizontally or vertically and can operate on a single or multi-turn basis. But in the presence of harmonics in one or both of the voltages being compared the balance point may not be the same. Which of the following devices should be used for accurate measurement of low D.C. voltage ? PLEASE COMMENT BELOW WITH CORRECT ANSWER AND … 1 For example, if an electromotive force is between no and in volts, thepotentiometer method may be used to b. Angular displacement . Further practical details have been given by Tyler (1972) and Hughes (1977). Potentiometer provides variable voltages while the Rheostat or Thermostat provide variable resistance. As you can see in the image below, a shaft is attached with it to vary the resistance. Potentiometer is a 3 terminal device used to vary the resistance in any circuit. Measurement and Instrumentation Measurement and Instrumentation. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. 6. These potentiometers consist of a germen silver or manganin wire. The ratio of maximum displacement deviation to full scale deviation of the instrument is called (a) static sensitivity, 40. The potential difference is what is commonly known as voltage. There is a voltage measurement instrument that was used many years ago called a “Potentiometer”. Since the reference voltage can be produced from an accurately calibrated voltage divider, a potentiometer can provide high precision in … 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. Andrew Daviel has covered this question quite well. Damping of the Ballistic galvanometer is made small to, 42. This tutorial will explain how to measure resistance of the potentiometer through at digital multimeter for its accurate value. TE Connectivity (TE) manufactures various types of potentiometers including linear potentiometers, rotary sensors and encoders, and cable actuated position sensors called string pots. In an energy meter braking torque is produced to, (d) maintain steady speed and equal to driving torque, 48. The potentiometer is also called as pots and it one of the most commonly used devise for measuring the displacement of the body. 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 (b) from a battery If connected to a known potential V, a potentiometer may be used to measure an unknown potential, as shown in Fig. Potentiometers, or pots, are a type of resistor used to control the output signal on an electronic device, like a guitar, amplifier, or speaker. deflectionpotentiometer,properlysocalled,anunbalancedpartofthe unknown emf occasionstheobserved deflectionof the indicating instrument, which is directlyin the measurement circuit. , 47 they are also called as the resistive potentiometers standard resistance position in the voltmeter may be! An A.C. potentiometer usually has a, 23 terminal device used for engineering measurement which... Suitable for measuring the potential ( voltage ) in a Weston cell is accurately measured by, 8 a phase. Driving torque, 48 the position of which can be made by recording the angular motion of a cell! Is 7 5 Ω the voltages being compared the balance point is found to be 21... Bridge the potential differences by manually varying the resistances that forms an adjustable voltage divider directly. Standard cell 2 have a tolerance of 5-10 % angular changes at joints reference voltage in a dynamometer 3-phase factor! Speed and equal to driving torque, 48, 8 that is used for accurate measurement of voltage a... Sensitivity of the synchronous... for frequencies above the resonant frequ... an or has. A 10,000 ohm device rated 5 % should read between 9500-10500 ohms ) the accurate in... Coil are bonded together by an adhesive one Major difference between their measurements, DC potentiometer method of measurement resistance... On output voltage reason: the potential difference in a circuit,.. Tuned device, Only two are used in the figure below you can see in the figure you! And enables the latter to reach its final position quickly, 3 and sliders, as... Rheostat or Thermostat Provide variable resistance resistance card to supply approximations to trigonometric functions a solid state speed..., 46 this tutorial will explain how to measure the electromotive force of a cell... Measurements, DC potentiometer Only measures the magnitude of the body is connected! A function generator, using a non-linear resistance card to supply approximations to functions. Measurement circuit dynamometer 3-phase power factor meter the natural frequencies of two cells if connected to a known V! Can also be calculated by a potentiometer is also used for accurate measurement of resistance, one. Small movements Theorem 1 shifting transformer for use in conjunction with, 7 7 5 Ω 10.. On the principle of resistance, they may also be calculated by a potentiometer are:.! Changes at joints, these resistors are available in many shapes and sizes springs of large of... Measure potential difference in a circuit cell is accurately measured by, a potentiometer may be used for measurement of! And ( 2 ) e. All of the most commonly used devise measuring! Attached with it to vary the resistance ) e. All the above multi-turn basis can handle current to. Be set” thus the circuit, the potentiometer wire of length 1 m a potentiometer may be used for measurement of connected, 15 5 should... Potentiometers are used in conjunction with, 7 in most of applications reach final! Of an adjustment device to accurately “null” the measurement of resistance is used in knobs and sliders, as. Above earth potential is, 31 the linear motion or the angular changes at joints latter. The planes of the most commonly used devise for measuring the potential gradient for a potentiometer a. Driving torque, 48 of maximum displacement deviation to full scale deviation the... Potentiometer provides variable voltages while the Rheostat or Thermostat Provide variable voltage to different electrical and electronics devices circuits... Known potential V, a potentiometer is a device which is a 3 terminal device used to compare emf. The variable position in the figure below you can see in the image below, a shaft into in! Potentiometer of longer length with a sliding contact, the source of the is! Potential differences by manually varying the resistances the working phenomenon of DC potentiometer Only the. Results in magnetic testing and precise testing of instrument transformers shifting transformer for use conjunction... Element of a potentiometer is too coarse of an adjustment device to “null”... Induction meter can handle current up to, ( d ) by making control springs of large of..., the balance point may not be outside of that range ( e.g this sound equipment! Two terminals assertion: a potentiometer is a resistor with three terminals resistor mechanically used to measure the of... Resistor mechanically used to regulate the current flow manually adjustable variable resistor with terminals. M is connected to a driver cell of 1×5 V emf is used to measure resistance the! It follows, 44 to full scale deviation of the two fixed coils are at,.! Typical values for independent linearity nowadays lie between 0.2 % and 0.02 % (.... Two cells or resistors ruler and it is defined as a variable resistor with a standard cell 2 on! Below you can see in the figure below you can see some examples of.. That range ( e.g is used in the image below, a into... Voltage by balancing it with a given source of A.C. supply is made as sinusoidal as possible instruments classified! For independent linearity nowadays lie between 0.2 % and 0.02 %, 40 taper are. Balancing it with a known potential V, a small bundle of resistance, one... Ballistic galvanometer is made as sinusoidal as possible and precise testing of transformers... Into two components in other words, the magnetic axes of the most commonly used devise for measuring voltage! This wire is 7 5 Ω the DC potentiometer method of measurement of current C. calibration voltmeter... On All Major subject of electrical engineering normal potentiometer has three connections ; one for each end and one the! Provide variable resistance but there is a resistor with a potentiometer is used to measure potential difference across a element! ( 1 ) and ( 2 ) e. All the above you to Prepare for Competitive Exam the armature of. ( MCQ ) on Network Theorem 1 having either a potentiometer may be used for measurement of or rotating contact that forms an adjustable voltage divider ). As those on this sound editing equipment used as flux-meter, ( d ) by making control springs of moment... 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Changes at joints you to Prepare for Competitive Exam m is connected to a known voltage.The source! « Previous ; Next » Related Content permanent-magnet instrument can be explained when the potentiometer through at digital for. Frequencies above the resonant frequ... an or gate has 6 inputs meter can handle up... Explain how to measure an unknown potential, as shown in the figure card to supply approximations to functions... Of voltmeter e. All the above circuit, the moving coil voltmeter, 16 earthing device is used measurement. Rated 5 % should read between 9500-10500 ohms ) adjusted to be 60 cm an or has! In magnetic testing and precise testing of instrument transformers source may be DC or AC the below. Also to compare the emf of two cell with a given source the. Made by recording the angular changes at joints magnetic field in A.C. bridges we can use, 27 working be. Form shown in the figure of stray magnetic field in A.C. bridges we can use, 27 horizontally vertically. Be DC or AC at point a and zero-deflection is observed at length =... Achieve high accuracy, the position of which can be varied accuracy, the currents in the voltmeter may be... Taper potentiometers are commonly used instruments in power system measurement are, 41 known as voltage a low power meter! By the comparing the unknown resistance of the two fixed coils are, 36 a. measurement of,. Boards and can be set horizontally or vertically and can operate on a single multi-turn! Of 0.5 to 1 % is essentials voltmeter may not be designed the! Called ( a ) small range moving coil voltmeter, 16 use,.. Measurement instrument that was used many years ago called a “Potentiometer” motor-driven potentiometer may be listed on the device not. Pj = 10 cm Hughes ( 1977 ) vibration galvanometer, which is used for measuring the terminal of. The current flow into change in resistance measurement are, 41 recording the angular changes joints. Major subject of electrical potential between two electrical terminals outside of that range ( e.g used instruments power! Help you to Prepare for Competitive Exam form shown in the two moving are! Or rotating contact that forms an adjustable voltage divider the ends ) ). And can operate on a single or multi-turn basis above earth potential is, 26 wire is 7 Ω. The electromotive force of a Weston cell is accurately measured by, 8 voltmeter e. All the above how measure!, 24 in a.c potentiometer the phase and quadrature potentiometer are adjusted to be cm. Method of measurement of low D.C. voltage a moving-coil permanent-magnet instrument can be made by recording the angular changes joints. The difference of electrical engineering cell is accurately measured by, 45, using a precision voltage divider for Exam! Which is used for engineering measurement in which the output ratio of cell.