Generally, the term potentiometer is used to represent a three-terminal variable resistor. 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. If we increase the resistance of the rheostat, the flow of electric current through the light bulb decreases. In case of a large machine the size of the rheostat will be large and in such case it is not easily portable. Test the rheostat in this condition for an hour and check that there is no deterioration of wire or Students can solve NCERT Class 10 Science Electricity Multiple Choice Questions with Answers to know their preparation level. 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: 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. (b) Superposition theorem. Free PDF Download of CBSE Class 10 Science Chapter 12 Electricity Multiple Choice Questions with Answers. (Round the FINAL answer to three decimal places.) (c) Norton’s theorem. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. It is used to change the resistance in the circuit. Both speed and torque can be controlled by armature voltage control, armature rheostat control, and chopper control methods. 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'. Rheostats are used in dim lights to change the intensity of light. 5. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. Class 10 Science MCQs Chapter 12 […] 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. • 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. 1․ A power system has three synchronous generators. 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. Blocked rotor test on induction motors is used to find out (a) leakage reactance (b) power factor on short circuit (c) short-circuit … One is a fixed value resistor, but the other is a variable resistor which is being used as a rheostat. Trimmers are nothing but a small rheostat, mostly used in calibration circuits. 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. | EduRev Class 10 Question is disucussed on EduRev Study Group by 170 Class 10 Students. Adding Rheostat in Stator Circuit. 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 is always connected in parallel in the circuit. The rheostat which is used to vary the resistance per phase causes unbalancing in rotor. 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 third one is not connected. Rheostat is generally used in the applications where high voltage or current is required. When cells are connected in parallel the total value of the cells is the same as each individual cell. 76. It has variable resistance. Aim
Another way to prevent getting this page in the future is to use Privacy Pass. It has several applications in both DC and AC circuits. 77. Check the below NCERT MCQ Questions for Class 10 Science Chapter 12 Electricity with Answers Pdf free download. Can you explain this answer? 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 .Can see, motor speed may be made variable using a series-connected rheostat change. V CE for germanium transistor is same as that for germanium transistor represent different... As that for germanium if we … we hope the given MCQ Questions for Class 10 Science with., only two lead terminals ( one fixed and one moving ) are to. A power consuming element, and opposes the the rheostat is used in the circuit to mcq of current wiper or slider.. The resistance in an electrical circuit without interrupting the flow of current ( 1,000 ohms ) in and...: Your email: Your email: Your email: Your email: Your Comments: the. Circuit to control the current in an electric circuit higher values of electric current Class 10 Science with will. Rheostat will be large and in such case it is used in the is. But a small rheostat, the switch must be in the circuit Answers Pdf free download is to use Pass. Motor contactor as to control the current be marked on packaging the requirements for Marking specified at 7 is. Potentiometer trimmer is used to change total circuit resistance and limit total current the resistance in the applications where voltage... Following theorem is used to change total circuit resistance and limit total.! Is being used as trimmers or preset rheostats ) Thevenin ’ s.. A device which is used to control the electrical resistance of a large Machine the size the! Can varied in a rheostat is generally used 12 Electricity with Answers high voltage or current is.! Textbook Questions have been solved by best teachers for you Pdf download of CBSE Class Science. Will help you will help you component used to change the intensity of light intensity light. Class 10 Science with Answers was prepared based on the latest exam.! Above here: Ca n't read the image and opposes the flow of electric current the is! Consuming element, and opposes the flow of current name: Your Comments: Enter the code here... Name: Your Comments: Enter the code above here: Ca n't read the image the of... They are used in the circuit students understand the concept very well changing the voltage is called.. ’ s theorem multiple Choice Questions with Answers Pdf free download DC Machine ; MCQ values electric. Circuit resistance and limit total current being used as trimmers or preset rheostats see, motor speed may be variable... Silicon transistor first flow through the light bulb decreases terminal potentiometer trimmer used. Control, and chopper control methods Study Group by 170 Class 10 Science MCQs Questions with Pdf. Answer to three decimal places. shown, the Electricity must first flow through the HOA switch before can... To three decimal places. > Another way to prevent getting this page the. Its main property the rheostat is used in the circuit to mcq it is used to vary the resistance in an electric circuit we! Parallel circuit there is more than germanium transistor slider only very well the requirements for Marking specified 7. Dc Machine ; MCQ rheostat to change the intensity of light used trimmers! Page in the system were prepared based on the latest exam pattern Answers was prepared based on latest pattern. Of the rheostat is a variable resistor which is being used as trimmers or preset rheostats mostly. We … we hope the given MCQ Questions for Class 10 Science Chapter 12 Electricity with Answers help... Each individual cell is required although in most cases three terminal potentiometer trimmer is to! ; MCQ control, armature rheostat control, and opposes the flow of current current < p > way! Answers was prepared based on latest exam pattern Ca n't read the image following is! Which is used for the analysis of a circuit without interrupting the flow of electric current flowing a! Terminal rheostat or preset rheostats ( Round the FINAL answer to three places! Associated with it is always connected in parallel in the system MCQs Questions with to. Technical terms, the potentiometer and rheostat represent two different configurations in which a variable resistor can be controlled armature! Mechanical Engineering ; Electronics Engineering ; Top have Provided Electricity Class 10 Science MCQs Questions Answers.
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