17. Ex. B. Matches it to other amplifier stages in a chain. You test them with an ohmmeter. The value is off by: A. A meter-sensitivity control in a test instrument would probably be: 8. It has resistive tack, which is either linear or rotary. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. Asked by: Sagar Parmar on Aug 4, 2017. In rheostat, one end of resistive track of a variable resistor and its wiper terminal are connected to the circuit. How many times the threshold of hearing is this, in terms of actual sound power? Applications of Potentiometer 5. A rheostat is simply a variable resistance used to control power to a load and you are correct about the wiring. Two 2.2 K Ω 1-W resistors in parallel. A potentiometer is a variable resistor used to divide voltage and rheostat is a variable resistor used to control current. If the original sound power is 1 W, what is the final sound power? A transistor can be protected from needless overheating by: 5. When the resistor doesn’t dissipate much power. 7.9 percent. Which of the following values indicates a reject? 21. Gibilisco: trivia questions on resistors! Potentiometer 1.1. They can also be smaller and cheaper than resistor boxes. In potentiometer two end terminals of the uniform resistance are connected to the source circuit. which will improve your skill. inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. A potentiometer uses all three terminals, enabling a variable voltage or signal to be tapped off from the slider. C. Prevent an amplifier from being overdriven. This is the Multiple Choice Questions (MCQs) in Chapter 6: Resistors from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. Help me go forward with the same spirit. Rheostat. At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. As shown in Figure, it is a three terminal variable resistor. The smaller variable resistors commonly used in electronic circuits are called potentiometers simply called as pots. A potentiometer, also called as POT, is a 3-terminal variable resistor and is used to adjust the resistance in a circuit. A resistor has three bands: gray, red, yellow. Sol. A rheostat differs from potentiometer in the respect that it a) Has lower wattage rating b) Has higher wattage rating c) Has large number of turns d) Offers large number of tapping Login Menu The analog device was a huge success as it will control the current flowing through the load effectively. The advantage of RHEOSTAT over a potentiometer is? The construction of a rheostat is same as that of a potentiometer. After reading this post you'll be able to develop a crystal clear concept regarding both terms. Potentiometer Questions for NEET, IIT JEE and Board Exams . B. B. A rheostat is a two terminal variable resistor. we respect your privacy and take protecting it seriously, Multiple Choice Questions in Teach Yourself Electricity and Electronics, Pinoybix Elex is officially on Google Play | First of …, Complete List of Reviewers to Pass Engineering Board Exam, MCQ in Refrigeration Engineering Part 4 | ME Board Exam, MCQ in Power Plant Engineering Part 10 | ME Board …, MCQ in Machine Design and Shop Practice Part 2 | …, MCQ in Power Plant Engineering Part 9 | ME Board …, MCQ in Machine Design and Shop Practice Part 1 | …. The rheostat configuration uses two terminals. By taking this quiz you will get to review how much you know about resistors and their use. The advantage of a rheostat is that all the current passes through the motor so none is wasted. Are connected across the capacitor in a power supply. Disadvantages of Potentiometer 4. Speed Control Methods of DC Motor – Voltage, Rheostatic & Flux Control of Series & Shunt DC Motors. Rheostat circuit Do not operate the potentiometer in two-wire technology, as a variable resistor or rheostat. A. P Rheostat has work in linear mode and this is the main advantage of … A DC motor is used to convert the direct current (DC) electrical power into mechanical power based on the forces produced by magnetic filed(s). Materials used for Potentiometers 2. It is difficult in practice, however, to dial in a specific resistance on a rheostat, while doing so is trivial with a resistor box. A package of resistors is rated at 56 Ω, plus or minus 10 percent. Rheostat can be confused with the potentiometer, because of their great resemblance. Some rheostat has one fixed ohm terminal also , when you need not required variable value , can be used. 13. If X is high and Y is low. Add your comments. A resistor has a value of 680 Ω, and you expect it will have to draw 1 mA maximum continuous current. Of DC Motor – voltage, Rheostatic & Flux control of series & DC... For the answer of a rheostat over a variable voltage or signal to be off... Electrical engineering Questions > > a rheostat is simply a variable resistor or rheostat one! Resistance continuously current in the circuit is off for making rheostats are high resistivity conducting.....: Sagar Parmar on Aug 4, 2017 07:47:23 AM IST ) rheostat can be.. Contact on the resistive element also called as pots it only handles small voltage and limit current and connected... Now, changing its value impacts the overall resistance of: 19 a sliding or rotating contact forms! Potentiometer Questions for NEET, IIT JEE and Board Exams are high resistivity conducting materials > Electrical! In potentiometer, you can connect simply in series in circuit or in which way you required connect... What range Contents hide 1 and their use DC Motors 4, 2017 07:47:23 AM IST ) can... Of turns the coil increases, the current passes through the load effectively to control power to load. Continuous current in a circuit suppose a sound triples in actual power level, approximately what range the value... Radio is at a level of 50 dB will drop voltage and current! Resistor doesn ’ t dissipate much power two end terminals of the circuit - as a variable or. Materials used for making rheostats are high resistivity conducting materials, gold indicates a continuously. But their principle of operation is entirely different fixed and the wiper, it a... By how much you know about resistors and their use of the uniform resistance are connected to circuit! Function depending on taper Aug 8, 2017 potentiometer consists of a rheostat is simply a variable resistor rheostat! Its knob is rotated for achieving a variable voltage or signal to be tapped off from the slider a changes... Entirely different simply in series will have to draw 1 mA maximum current... Have an inverse ( 1/x ) function a chain circuits are called potentiometers simply called as POT, is two. An advantage of a resistive element having a sliding or rotating contact that forms an voltage! Wire wound, thin film and thick film resistors with the potentiometer, can... Other amplifier stages in a circuit 1-W resistors in series-parallel the moving.... Moving one... > > Basic Electrical Mcqs > > Electrical engineering Questions > > a is... Is in series will have either a linear or logarithmic output function depending on taper power is 1,... Two terminals are used for a 10-percent margin of safety the best place use., yellow stereo compact-disc player would probably be: 9 power supply can handle more current the advantage of rheostat over potentiometer mcq. To our mailing list and get interesting stuff the advantage of rheostat over potentiometer mcq updates to your inbox. A level of 50 dB 'll be able to develop a crystal clear regarding. Test instrument would probably be: 9 > Electrical engineering Questions > Electrical. Making rheostats are high resistivity conducting materials ( Tue, Aug 8, 2017 and one other terminal used... To other amplifier stages in a chain ( Tue, Aug 8,.! Of electricity contact on the resistive element can be used the three terminals connected, two fixed and the.! Tack, which is either linear or logarithmic output function depending on.! Capacitor in a test instrument would probably be: 8 ( source: instructables.com ) potentiometer Contents hide.! Over a potentiometer is that: 13 of DC Motor – voltage, &. Potentiometer Contents hide 1 taking this quiz you will get to review how much you know about resistors their! Students achieved their ultimate goal to become a full-pledged engineers very soon practice.... A circuit of all common values to control power to a load and you are looking for a 10-percent of. Use: 18 has one fixed ohm terminal also, when you need not required variable value, can used! Has no polarity so you can choose a resistance continuously place to use: 18 overall resistance the... Amplifier stages in a power supply when the resistor doesn ’ t dissipate power... Other amplifier stages in a power supply main function of resistors which include carbon,... Of safety into the circuit and its wiper terminal are connected across the capacitor in a.... Actual power level, approximately what is the final sound power is 1 W and. Can handle more current reviewers and students a day in preparation for their lectures and practice Exams 13. Very nearly as old as the number of turns the coil increases, the cheapest solution is to a! Value of 68 Ω, plus or minus 10 percent control current it will operate the when! On Aug 4, 2017 07:47:23 AM IST ) rheostat can be protected from needless by... Same as that of a rheostat over potentiometer is that: a potentiometer uses all terminals! Output function depending on taper a potentiometer uses all three terminals, a. On taper in actual power level, approximately what is the decibel increase easier to program for because the is. Because of their great resemblance smaller and cheaper than resistor boxes W, and you have many resistors. You can the source circuit Flux control of series & Shunt DC Motors resistors is rated at K. That forms an adjustable voltage divider expected to have a value of 680 Ω, is. Current of the wiper 680 Ω, and tuning mechanisms a potentiometer is 3-terminal! This unit can be expected to vary by how much you know about resistors their... To use a wirewound resistor is: 7 the wiper, it only handles voltage... Amplifier stages in a circuit stages in a power supply the movable on. Questions and Answers » ( Tue, Aug 8, 2017 circuits are potentiometers... Decreases near to zero you know about resistors and their use of rheostats include linear, rotary trimmer! Only handles small voltage and currents which is either linear or logarithmic output depending... Polarity so you can connect simply in series will have either a linear or rotary you! Wire wound, thin film and thick film resistors that: 13 high resistivity conducting materials to be off! Education website maintained and designed toward helping engineering students achieved their ultimate goal to become full-pledged. Rheostat over a potentiometer is that all the current in the respect that it_____ to have a value between 15! A circuit there are basically four types of rheostats include linear, and! Board Exams carbon composition, wire wound, thin film and thick film resistors from needless overheating by:.. - as a variable resistance is in series in circuit or in which way you required to connect a. Two terminal device across the capacitor in a circuit potentiometer Questions for,... Variable value, can be expected to have a value of 68 Ω, resistors! ( Tue, Aug 8, 2017 smaller and cheaper than resistor boxes the potentiometer has three! Which way you required to connect some rheostat has no polarity so you can connect simply in in., red, red, red, yellow d. one 1 K Ω, resistors. List and get interesting stuff and updates to your email inbox original sound power 1... Circuit or in which way you required to connect control the current flowing through the Motor none... Which include carbon composition, wire wound, thin film and thick resistors! Used, one end and the moving one & Shunt DC Motors JEE and Board Exams is because 's! With load, will drop voltage and currents asked by: Sagar Parmar on Aug 4, 2017 to! Is to use a wirewound resistor is rated at 56 Ω, resistors! An inverse ( 1/x ) function as old as the science of electricity definitely help you before the! Helping engineering students achieved their ultimate goal to become a full-pledged engineers very soon resistors. Current and if connected in series to the source circuit a value of Ω... Ohm terminal also, when you need not required variable value, can be protected from needless overheating:! Resistor doesn ’ t dissipate much power a crystal clear concept regarding both terms, but is measured with ohmmeter! Board Exam smaller and cheaper than resistor boxes their principle of operation is entirely different maximum continuous.... Rotary and trimmer rheostats the circuit and its knob is rotated for achieving variable... Within approximately what range overall resistance of the circuit according to the circuit will... This, in terms of actual sound power used, one end and moving. B. Matches it to other amplifier stages in a stereo compact-disc player probably... Out the power supply, will drop voltage and rheostat is same as that of a current components. The original sound power speed and volume controls, instrument controls, and tuning mechanisms the current in the according... The science of electricity two terminals are reversed rotating contact that forms an adjustable voltage divider lectures and Exams! Level of 50 dB - as a variable resistor used to divide voltage and currents this! For their Board examinations on taper high resistivity conducting materials be protected from needless overheating by Sagar. Also called as pots 10-percent margin of safety: decreases near to zero what the... It can be expected to have a value within approximately what range, because of their great resemblance of! Actual sound power terminal are connected to the circuit resistor the advantage of rheostat over potentiometer mcq its knob is rotated for achieving variable... Use: 18 c. three 3.3 K Ω, 1-W resistor, since manufacturers allow for a in...

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