* Resistance can varied in a circuit without the interruption so as to control the current. As shown, the electricity must first flow through the HOA switch before it can energize the coil of the motor contactor. « Back CONTENTS Next » 1. Assuming generators and transmission network to be lossless, the system frequency for a load of 700 MW is Rheostats are used in dim lights to change the intensity of light. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. If we increase the resistance of the rheostat, the flow of electric current through the light bulb decreases. If we … (d) Reciprocity. 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. 77. Rheostat is an adjustable or variable resistor. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 10 Physics Electricity. It is used to control the electrical resistance of a circuit without interrupting the flow of current. Rheostat is used for varying higher values of electric current. The third one is not connected. 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. Published by Houghton Mifflin Harcourt Publishing Company. of the rheostat till the ammeter reads the also be marked on packaging of rheostat. Calculate the circuit current with the rheostat set at maximum value (1,000 ohms). While the rheostat is a two terminal device that forms connection with one end and the wiper or slider only. The unit is volts (V). Your name: Your email: Your Comments: Enter the code above here : Can't read the image? Sliding the movable contact, the resistance between terminals can be varied. Free PDF Download of CBSE Class 10 Science Chapter 12 Electricity Multiple Choice Questions with Answers. Test the rheostat in this condition for an hour and check that there is no deterioration of wire or Rheostat is generally used in the applications where high voltage or current is required. c) The saturation voltage V CE for silicon transistor is same as that for germanium. These motors are used where the motor speed below the base speed is required as they cannot be operated above the base speed. In a rheostat, only two lead terminals (One fixed and one moving) are connected to the circuit. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Rheostat is the instrument used to control the current in an electric circuit. Generally, the term potentiometer is used to represent a three-terminal variable resistor. MCQ OF ELECTRICITY . Which of the following theorem is used for the analysis of a transistor circuit (a) Thevenin’s theorem. Rheostat: A component used to regulate the electric current flowing through a circuit without changing the voltage is called Rheostat. 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. 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. | EduRev Class 10 Question is disucussed on EduRev Study Group by 170 Class 10 Students. 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. Both speed and torque can be controlled by armature voltage control, armature rheostat control, and chopper control methods. - 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! Its main property is it is a power consuming element, and opposes the flow of current. Magnetic Circuit; DC Generator; DC Machine; MCQ. (c) Norton’s theorem. It is used to change the resistance in the circuit. 76. Voltage vs Current 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 … Resistance is a passive element in electrical and electronic circuits. • 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. Multiple Choice Question (MCQ) of Electronics page-17:241. Rheostat. Blocked rotor test on induction motors is used to find out (a) leakage reactance (b) power factor on short circuit (c) short-circuit … Aim It requires more maintenance, hence the cost associated with it is more. (Round the FINAL answer to three decimal places.) c) The saturation voltage V CE for silicon transistor is same as that for germanium. A rheostat is a device which is used to vary the resistance in an electrical circuit without interrupting the circuit. 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'. It is used to control the electrical resistance of a circuit without interrupting the flow of current. 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. It has variable resistance. One is a fixed value resistor, but the other is a variable resistor which is being used as a rheostat. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. 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. The rheostat which is used to vary the resistance per phase causes unbalancing in rotor. The most common way to vary the resistance in a circuit is to use a rheostat. 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: 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. Commonly available resistors have a fixed value and are used for restricting smaller values of electric current. It has several applications in both DC and AC circuits. It is always connected in parallel in the circuit. As you can see, motor speed may be made variable using a series-connected rheostat to change total circuit resistance and limit total current. (b) Superposition theorem. Which of the following statement is true? 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 . 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. To get through the switch, the switch must be in the hand or auto position. Enter Your Suggestion/Comments Here. The entire NCERT textbook questions have been solved by best teachers for you. Can you explain this answer? Take the quiz to find out! 5. Mechanical Engineering; Electrical Engineering; Electronics Engineering; Civil Engineering; Top. In a parallel circuit there is more than one path for the current to flow along. * Rheostat is a variable resistance which is used in the circuit to control the current. Two terminal trimmers are available, although in most cases three terminal potentiometer trimmer is used as a two terminal rheostat. In technical terms, the potentiometer and rheostat represent two different configurations in which a variable resistor can be used. The resistances generate huge losses and generate heat in the system. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. We hope the given MCQ Questions for Class 10 Science Electricity with Answers will help you. 3. In case of a large machine the size of the rheostat will be large and in such case it is not easily portable. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. 8.2 Marking on Packaging The requirements for marking specified at 7 shall IS 8622 : 1999 marked current of the rheostat. Science Lab Manual Class 10 Experiment – 1.

Another way to prevent getting this page in the future is to use Privacy Pass. Class 10 Science MCQs Chapter 12 […] Check the below NCERT MCQ Questions for Class 10 Science Chapter 12 Electricity with Answers Pdf free download. 1․ A power system has three synchronous generators. It is most often designed with a ceramic core. Multiple Choice Question (MCQ) of Electronics page-17:241. Click here to refresh The circle diagram for an induction motor cannot be used to determine (a) efficiency (b) power factor (c) frequency (d) output Ans: a. 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. Brief History 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. When it is used in a control circuit, it looks like Figure 3-18. 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. Adding Rheostat in Stator Circuit. Students can solve NCERT Class 10 Science Electricity Multiple Choice Questions with Answers to know their preparation level. The following circuit contains two resistors.
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. Which of the following statement is true? Preset Rheostat: When rheostats are used in a printed circuit board, they are used as trimmers or preset rheostats. In this post, you'll learn the 3 essential differences between both. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. Be marked on packaging of rheostat marked on packaging of rheostat power consuming element and! Cells are connected to the circuit to control the current above here: Ca n't read the image board they... Resistances generate huge losses and generate heat in the hand or auto position two... The saturation voltage V CE for silicon transistor is more than germanium transistor is more than germanium transistor more... 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