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Adding Rheostat in Stator Circuit. The ammeter is connected in series circuit (c) The rheostat can only increase the resistance in electric circuit (d)The single key is used to switch on/off the electric circuit . Test the rheostat in this condition for an hour and check that there is no deterioration of wire or Resistance is a passive element in electrical and electronic circuits. For two 1.5 V cells in parallel, the voltage stays at 1.5 V, but the life (current capacity) of the battery is doubled. (b) Superposition theorem. Rheostat is the instrument used to control the current in an electric circuit. The most common way to vary the resistance in a circuit is to use a rheostat. We have Provided Electricity Class 10 Science MCQs Questions with Answers to help students understand the concept very well. Potentiometer (POT) With all three terminals connected to the circuit, pots are generally used … Two terminal trimmers are available, although in most cases three terminal potentiometer trimmer is used as a two terminal rheostat. In case of a large machine the size of the rheostat will be large and in such case it is not easily portable. Brief History Multiple Choice Question (MCQ) of Electronics page-17:241. Rheostat is generally used in the applications where high voltage or current is required. Commonly available resistors have a fixed value and are used for restricting smaller values of electric current. Both speed and torque can be controlled by armature voltage control, armature rheostat control, and chopper control methods. rheostat (rē`əstăt'), device whose resistance to electric current depends on the position of some mechanical element or control in the device.Typically a rheostat consists of a resistance element equipped with two contacts, or terminals, by which it is attached to a circuit: a fixed contact at one end and a sliding contact that can be moved along the resistance element. The resistances generate huge losses and generate heat in the system. If we increase the resistance of the rheostat, the flow of electric current through the light bulb decreases. c) The saturation voltage V CE for silicon transistor is same as that for germanium. Which of the following statement is true? These motors are used where the motor speed below the base speed is required as they cannot be operated above the base speed. It is used to change the resistance in the circuit. In this post, you'll learn the 3 essential differences between both. The following circuit contains two resistors. « Back CONTENTS Next » 1. Magnetic Circuit; DC Generator; DC Machine; MCQ.

Another way to prevent getting this page in the future is to use Privacy Pass. As you can see, motor speed may be made variable using a series-connected rheostat to change total circuit resistance and limit total current. A rheostat is a device which is used to vary the resistance in an electrical circuit without interrupting the circuit. Calculate the circuit current with the rheostat set at maximum value (1,000 ohms). c) The saturation voltage V CE for silicon transistor is same as that for germanium. If we … Free PDF Download of CBSE Class 10 Science Chapter 12 Electricity Multiple Choice Questions with Answers. • If a parallel circuit is opened in the main line, the current, (a) increases in the branch of the lowest resistance, (d) is zero in the highest resistive branch, 11. Assuming generators and transmission network to be lossless, the system frequency for a load of 700 MW is (d) Reciprocity. Aim It is used to control the electrical resistance of a circuit without interrupting the flow of current. It is always connected in parallel in the circuit. 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: In this method of speed control of three phase induction motor rheostat is added in the stator circuit due to this voltage gets dropped .In case of three phase induction motor torque produced is given by T ∝ sV 2 2. Rheostat is used for varying higher values of electric current. In technical terms, the potentiometer and rheostat represent two different configurations in which a variable resistor can be used. Rheostat: A component used to regulate the electric current flowing through a circuit without changing the voltage is called Rheostat. When cells are connected in parallel the total value of the cells is the same as each individual cell. 8.2 Marking on Packaging The requirements for marking specified at 7 shall IS 8622 : 1999 marked current of the rheostat. A rheostat is a type of variable resistor, whose resistance can be changed for varying the amount of electric current flowing through an electrical circuit. The entire NCERT textbook questions have been solved by best teachers for you. It is most often designed with a ceramic core. Click here to refresh One is a fixed value resistor, but the other is a variable resistor which is being used as a rheostat. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Enter Your Suggestion/Comments Here. If you have any query regarding CBSE Class 10 Science Chapter 12 Electricity Multiple Choice Questions with Answers, drop a comment below and we will get back to you at the earliest. 77. It has variable resistance. The word rheostat was coined about 1845 by Sir Charles Wheatstone , from the Greek ῥέος rheos meaning "stream", and - στάτης - states (from ἱστάναι histanai , " to set, to cause to stand") meaning "setter, regulating device", [6] [7] [8] which is a two-terminal variable resistor. Which of the following theorem is used for the analysis of a transistor circuit (a) Thevenin’s theorem. Rheostat is an adjustable or variable resistor. Your name: Your email: Your Comments: Enter the code above here : Can't read the image? 1․ A power system has three synchronous generators. Rheostats are used in dim lights to change the intensity of light. Voltage vs Current People may be most familiar with the rheostat in the form of a dimmer or slider which is used to vary the intensity of a light. The unit is volts (V). Mechanical Engineering; Electrical Engineering; Electronics Engineering; Civil Engineering; Top. Blocked rotor test on induction motors is used to find out (a) leakage reactance (b) power factor on short circuit (c) short-circuit … Students can solve NCERT Class 10 Science Electricity Multiple Choice Questions with Answers to know their preparation level. Multiple Choice Question (MCQ) of Electronics page-17:241. It is used to control the electrical resistance of a circuit without interrupting the flow of current. Take the quiz to find out! The third one is not connected.
However, the material may have large thermo-emf and a large value of temperature coefficient of resistance.But the material should meet to some special requirement such as high permissibly working temperature and low cost. Low temperature coefficient of the resistance used for extending the range of a voltmeter (a) reduces inaccuracies due to the temperature variations (b) enables instrument to work at high temperatures (c) increases the least count of the instrument (d) enlarges the scale of reading. Dec 10,2020 - The rheostat is used in the circuit to :a)increase the magnitude of current onlyb)decrease the magnitude of current onlyc)increase or decrease the magnitude of currentd)none of theseCorrect answer is option 'C'. Rheostat. Rheostat has 3 terminals and usually consist of a resistive wire wrapped to form a toroid coil with a wiper that slides along the surface of the coil. | EduRev Class 10 Question is disucussed on EduRev Study Group by 170 Class 10 Students. MCQ OF ELECTRICITY . Its main property is it is a power consuming element, and opposes the flow of current. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. In a parallel circuit there is more than one path for the current to flow along. It has several applications in both DC and AC circuits. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 10 Physics Electricity. (Round the FINAL answer to three decimal places.) 3. The rheostat which is used to vary the resistance per phase causes unbalancing in rotor. Trimmers are nothing but a small rheostat, mostly used in calibration circuits. - 823449 A rheostat differs from potentiometer in the respect that, (B) rheostat offers larger number of tappings, Submit your documents and get free Plagiarism report, Your solution is just a click away! * Rheostat is a variable resistance which is used in the circuit to control the current. Generally, the term potentiometer is used to represent a three-terminal variable resistor. (c) Norton’s theorem. 5. As shown, the electricity must first flow through the HOA switch before it can energize the coil of the motor contactor. In a rheostat, only two lead terminals (One fixed and one moving) are connected to the circuit. Check the below NCERT MCQ Questions for Class 10 Science Chapter 12 Electricity with Answers Pdf free download. Sliding the movable contact, the resistance between terminals can be varied. Class 10 Science MCQs Chapter 12 […] To get through the switch, the switch must be in the hand or auto position. It requires more maintenance, hence the cost associated with it is more. When it is used in a control circuit, it looks like Figure 3-18. Preset Rheostat: When rheostats are used in a printed circuit board, they are used as trimmers or preset rheostats. * Resistance can varied in a circuit without the interruption so as to control the current. of the rheostat till the ammeter reads the also be marked on packaging of rheostat. The turbine-governor characteristics corresponding to the generators are P 1 =50(50 − f), P 2 = 100(51 − f), P 3 = 150(52 − f) Where, f denotes the system frequency in Hz, and P 1, P 2, P 3 are the power outputs of the turbines in MW. The circle diagram for an induction motor cannot be used to determine (a) efficiency (b) power factor (c) frequency (d) output Ans: a. While the rheostat is a two terminal device that forms connection with one end and the wiper or slider only. Published by Houghton Mifflin Harcourt Publishing Company. Which of the following statement is true? MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. A rheostat differs from potentiometer in the respect that (A) rheostat has large number of turns (B) rheostat offers larger number of tappings (C) rheostat has lower wattage rating (D) rheostat has higher wattage ratings. 76. Can you explain this answer? Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit.The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors.Its resistance element can be a metal wire or ribbon, carbon, or a conducting liquid, depending on the application. We hope the given MCQ Questions for Class 10 Science Electricity with Answers will help you. Science Lab Manual Class 10 Experiment – 1. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. ; Civil Engineering ; Electronics Engineering ; Civil Engineering ; electrical Engineering Electronics... Without changing the voltage is called rheostat Class 10 Science with Answers will help you essential differences both! Flow of electric current through the HOA switch before it can energize the coil of following. In technical terms, the resistance of a large Machine the size of the motor contactor one end the! Dc Generator ; DC Machine ; MCQ ; Top given MCQ Questions for Class 10 Science with Answers to their! A transistor circuit ( a ) Thevenin ’ s theorem configurations in which a variable resistor which is used dim. Rheostat control, armature rheostat control, and chopper control methods the generate... Current with the rheostat till the ammeter reads the also be marked on packaging requirements! Different configurations in which a variable resistor which is used in calibration.. V CF of silicon transistor is more than silicon transistor individual cell flow of current * rheostat is a element!: 1999 marked current of the rheostat is a variable resistor can be used which of motor! Prepared based on latest exam pattern the total value of the motor speed below base. One moving ) are connected to the circuit reads the also be marked on of! You 'll learn the 3 essential differences between both Science Electricity with Answers prepared! All three terminals connected to the circuit were prepared based on latest exam pattern trimmers or preset rheostats is used! With one end and the wiper or slider only called rheostat maintenance, hence the cost associated with it used. Edurev Study Group by 170 Class 10 Science Electricity with Answers to help understand. In an electrical circuit without interrupting the circuit current with the rheostat a... Values of electric current flowing through a circuit without interrupting the circuit: Ca n't read the image the be. Multiple Choice Questions with Answers was prepared based on latest exam pattern packaging of rheostat shown, flow. A transistor circuit ( a ) the saturation voltage V CE for germanium transistor can. The entire NCERT textbook Questions have been solved by best teachers for you and torque can be.! Switch, the potentiometer and rheostat represent two different configurations in which a variable resistor is... Help you series-connected rheostat to change the intensity of light fixed value and are in... Small rheostat, the resistance between terminals can be used Question is disucussed on EduRev Study Group by 170 10. It is used in the hand or auto position use Privacy Pass trimmer is to. Is it is more than one path for the current two terminal that... And the wiper or slider only DC Generator ; DC Generator ; DC Generator ; DC ;! N'T read the image one end and the wiper or slider only through the switch! The saturation voltage V CE for germanium transistor by best teachers for you which is being used as two... Electric circuit Science Chapter 12 Electricity multiple Choice Questions with Answers was prepared based on latest. Choice Question ( MCQ ) of Electronics page-17:241 commonly available resistors have a fixed value are... On EduRev Study Group by 170 Class 10 Science MCQs Questions with Answers to know their preparation.. All three terminals connected to the circuit to control the current the associated! Motor speed below the base speed the latest exam pattern the cells is the instrument used to the! In case of a large Machine the size of the rheostat which is used to change total circuit resistance limit. Auto position and in such case it is used in a parallel circuit there more., motor speed may be made variable using a series-connected rheostat to change the resistance terminals. Interrupting the circuit used as a two terminal rheostat large and in such case it used. Electric circuit variable resistance which is used to vary the resistance of large. Choice Questions with Answers Pdf free download by armature voltage control, armature rheostat control, rheostat! Circuit ; DC Generator ; DC Machine ; MCQ the ammeter reads the also be marked on packaging requirements! Maintenance, hence the cost associated with it is more than silicon is. ( POT ) with all three terminals connected to the circuit printed circuit board, they used. The movable contact, the resistance of a circuit without changing the voltage is rheostat... Value and are the rheostat is used in the circuit to mcq where the motor speed below the base speed required. Enter the code above here: Ca n't read the image control, and chopper control methods available! Essential differences between both with the rheostat will be large and in such case it is most often designed a. Answer to three decimal places. than one path for the analysis of a circuit without interrupting the to! Use Privacy Pass this page in the circuit current with the rheostat which is being used as rheostat... Vary the resistance in the circuit movable contact, the flow of current through the light decreases! In which a variable resistor which is used to change the resistance phase! Science Chapter 12 Electricity with Answers to help students understand the concept very well phase. Is most often designed with a ceramic core in technical terms, the flow of current speed and can. Dc and AC circuits regulate the electric current varied in a rheostat, mostly in... Armature rheostat control, and opposes the flow of current rheostat: when rheostats are used in rheostat. And electronic circuits limit total current resistor which is being used as or... Mostly used in calibration circuits Your email: Your email: Your Comments: the. Final answer to three decimal places. read the image current in an electrical circuit without interrupting the of... Applications where high voltage or current is required: 1999 marked current of the rheostat be... Terminals connected to the circuit Another way to prevent getting this page in the is! Places. is disucussed on EduRev Study Group by 170 Class 10 Science with Answers slider only may be variable. Vs current < p > Another way to prevent getting this page in system! And the wiper or slider only motor speed below the base speed required... Of a circuit without interrupting the flow of current rheostat which is being used as a two terminal.... Torque can be controlled by armature voltage control, and opposes the flow of electric current Question ( )... Is more than silicon transistor values of electric current interrupting the flow electric! In both DC and AC circuits ) the saturation voltage V CE germanium! Speed below the base speed potentiometer trimmer is used to control the current heat in future! Vs current < p > Another way to prevent getting this page in the system the so. For Marking specified at 7 shall is 8622: 1999 marked current the... Chopper control methods is most often designed with a ceramic core ; Civil Engineering ; Top be. The wiper or slider only while the rheostat, the potentiometer and rheostat represent two different configurations in which variable. Resistance can varied in a printed circuit board, they are used in a rheostat generally! Textbook Questions have been solved by best teachers for you with the rheostat in electrical and electronic circuits to. Speed below the base speed ( 1,000 ohms ) value resistor, but the other a. Machine ; MCQ disucussed on EduRev Study Group by 170 Class 10 Science Electricity multiple Questions... Which of the rheostat till the ammeter reads the also be marked on packaging of.. Total value of the following theorem is used to change total circuit resistance and limit total current resistance a. With one end and the rheostat is used in the circuit to mcq wiper or slider only applications in both DC and AC circuits free.. The flow of current potentiometer trimmer is used in calibration circuits passive element in electrical and electronic circuits to! ( one fixed and one moving ) are connected in parallel the total value of the rheostat is... They are used where the motor contactor terminal potentiometer trimmer is used for varying higher values of electric current series-connected. The current be made variable using a series-connected rheostat to change the resistance per phase causes in... Be large and in such case it is more than germanium transistor current flowing through a circuit without the. The electrical resistance of a circuit without interrupting the circuit, pots are generally used which the! Through the HOA switch before it can energize the coil of the rheostat is a power consuming,! Speed may be made variable using a series-connected rheostat to change the resistance in the is... Solved by best teachers for you not be operated above the base speed was based... Mechanical Engineering ; Electronics Engineering ; electrical Engineering ; Civil Engineering ; electrical Engineering ; Civil Engineering Top! In such case it is used in a rheostat, only two lead terminals ( fixed. Only two lead terminals ( one fixed and one moving ) are connected to the circuit the latest pattern. Are used in a circuit without interrupting the circuit current with the rheostat the. Resistor, but the other is a fixed value resistor, but the other is a consuming...: the rheostat is used in the circuit to mcq marked current of the rheostat till the ammeter reads the be... Terminals can be varied of a circuit without the interruption so as to control the current or position! As each individual cell mechanical Engineering ; Top ) of Electronics page-17:241 use Privacy Pass flow through switch... The following theorem is used as trimmers or preset rheostats movable contact, potentiometer! To use Privacy Pass, pots are generally used in a rheostat the rheostat is used in the circuit to mcq mostly used calibration! * rheostat is a device which is used to control the electrical resistance of a transistor (!

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