30) Which of the gien material does not change the resistance with varying temperature. (D) In the same phase, 54. (A) The higher scale has been selected 14) Find the term ratio of the bridge rectifier at 20V D.C. output when the supply voltage is 230V, 50Hz. This output is produced by an operational amplifier performing as an integrator. (B) Approximately 90 Explanation: Buchholz relay can resist the possible major fault in the transformer. (A) The induced e.m.f. It is a semiconductor device that is mostly used for power frequency operation. The presence of the dielectric reduces the effective electric field. $34.99. (C) Keeping the magnetizing current to the minimum 43) Which of the given test is used for the calculation of the inertia of the rotor? (C) both wattmeters give positive reading L = 2r =2 5 10-2 m, \(H=\frac{NI}{L}=\frac{100 5}{10 10^{-2}}=\frac{5000}{}\), \(B_{net}=4\pi \times 10^{-7}\times 1000\times \frac{5000}{\pi}=2\ T\). less (narrower) the bandwidth, more will be the Q value. For example, if a student takes up science after their board exams, topics like mechanics and waves, etc. The squirrel cage induction motor has a tendency to run at a slow speed as compared to its synchronous speed; this phenomenon is called crawling. (B) LED and a photodiode Which one of the following is NOT a cause for the above? (C) OL relay is not re-set It is analogous to the antiferromagnetic material. (C) 180 with field axis This wave is generally used for digital kind of applications. It is an electronic instrument used to find the EMF. The retardation (Varying speed) is directly proportional to the retarding torque and inversely proportional to the inertia. Requested URL: byjus.com/ncert-solutions-class-12-physics/, User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36. Many obstructing panels are also fitted in the column to ensure proper and uniform mixing inside the tank. It is also inversely proportional to the square of the distance Includes admin fee & airport taxes. For Class 9 students science project is a part of their curriculum. Circuit properties changes by changing the direction of current or voltage, Circuit properties will remain the same even by changing the direction of current or voltage, V-Igraph is a straight line passing through the origin, The elements that supply energy to the circuit is called active element, These have an ability to control the flow of charge, Used for current control and voltage control applications, The element which receives or absorbs energy and then either converts it into heat (R) or stored it in an electric (C) or magnetic (L) field is called passive element, Do not need any form of electrical power to operate, Used for energy storage, discharge, oscillating, filtering and phase shifting applications. Electric flux density (D) is a vector quantitybecause it is simply the product of the vector quantity electric field and the scalar quantity permittivity of the medium, i.e. (A) Frequency control method A linear network refers to networks whose parameters(Resistance, capacitance, Inductance, etc.) (A) Approximately 0 According to Gausss law, the electric field due to an infinitely long thin charged wire varies as: Gausss Law:Total electric flux through a closed surface is1/otimes the charge enclosed in the surface i.e. The reason for using AC supply for resistance measurement is: ITI Electrician Questions and Answers Question Papers for exams are available on our page. (A) To amplify voltage Schottky diode is called a hot-carrier diode. (C) The line current is three times higher in delta connection than in star connection A. is inversely proportional to the separation of wires, B. is proportional to the magnitude of each current. Where1= Lowerhalf-power frequencies It refers to a relay that protects the electrical machine from the negative sequence component. Function generator; Phase Locked Loop; Tone generator At this condition, the source voltage is in phase with the source current and the power factor is unity. (D) Two LEDs, 56. According to National electric code what is the specified minimum distance between the washing unit and the switch board: (C) At leading power factor Applications of Voltage Controlled Oscillator. (A) Double earthed Explanation: Differential compound motor has poor starting torque at full load speed with same H.P. energy delivered to the element is negative then the element is anactive element. Explanation: A D.C. motor Preferred over A.C. motor because of its Variable speed operation. The correct answer is (option 2) i.e. You are working with a fully automatic star delta starter. (B) Proximity effect How the light output is produced in electric discharge lamp? Find the rotor copper loss of the motor, Rotor copper loss = sPg = 0.08 19.92 = 1.596 kW = 1596 W, 35) Which of the given relays can resist the possible major fault in the transformer. Two sinusoidal currents are given by the equations [At same frequency ()], \({i_1} = 50\sin \left( { t + \frac{\pi }{4}} \right)\)and. Class 9 exam papers is a fruitful resource for the students as it will provide students a brief structure of the questions asked in the examination which will in return help them study accordingly. For proper preparation, knowing the syllabus is very important along with solving various sample questions. When the bit is 1, the voltage is high and the switch is closed. The trouble will be in: 36) In a three-phase transformer, the primary winding is delta connected, and the secondary winding is star connected, and the secondary to primary turn ratio per phase is 15. At 300K its resistance is 1 ohm. unit for resistivity is the ohm-meter. Learn the science & mystery of oceans in a masterclass with Tasneem Khan, a marine zoologist & diver with 1000+ dives! Example: Diode, transistor, voltage source, Bilateral Element: These elements allows conduction of current in both directions with same magnitude, Allahabad University Group C Non-Teaching, Allahabad University Group A Non-Teaching, Allahabad University Group B Non-Teaching, BPSC Asst. (B) Lap winding The main goal is to understand how the universe behaves and how the energy is produced. We are providing you with the electrician interview questions, Old Question Papers. (B) Corrosion due to galvanic action We sincerely follow Copyright Law. Atomic dipole alignment increased with an increase in external field strength and decreased with temperature. A ceiling fan rotates slowly in either direction. Ltd.: All rights reserved, \({\left( {\frac{R}{{2L}}} \right)^2} > \frac{1}{{LC}}\), \({\left( {\frac{R}{{2L}}} \right)^2} < \frac{1}{{LC}}\), \({i_1} = 50\sin \left( {\omega t + \frac{\pi }{4}} \right)\), \({i_2} = 25\sin \left( { t - \frac{\pi }{6}} \right)\), \( = \frac{\pi }{4} - \left( { - \frac{\pi }{6}} \right) = 75^\circ \). true - true - true CONCEPT: Coulombs Law talks about the magnitude of the attraction between the two charges. 16) The purpose of dummy coil in D.C. machine is. o= absolute permeability of air or vacuum. In the magnetic circuit shownbelow, what is the flux density produced if the relative permeability of the core material under the given condition is 1000? (C) Constant voltage supply to load (C) Mercury vapour lamp Electric displacementdenoted by D is nothing but the charge per unit area that would be displaced across a layer of conductor placed across an electric field. The ability of the XOR gate to compare two logic levels and give an output dependent upon the input condition is very useful in many computational circuits. (A) The receiving end (B) Armature current Vs Induced e.m.f It is important that subjects like science and maths are learnt properly by understanding each concept and topic as these topics would be included in higher standards. Ideal voltage source:An ideal voltage source have zero internal resistance. 38) In a transformer, the humming sound is primarily due to. Since both phasors have different frequencies, hence phase differences cannot be determined because of their different time period and cycle length. A cylindrical coil of many tightly wound turns of insulated wire with a general diameter of the coil smaller than its length is called asolenoid. The CBSE Class 9 can be called as the foundation for higher classes and thus it is very important for students to learn the topics thoroughly. A solenoid is basically a tightly wound helical coil of wire which is made up of a smaller diameter compared to its length. CBSE Sample Paper for Class 9 Social Science. Since both bulbs are rated at the same voltage, we can say that resistance of each bulb is inversely proportional to its rated power. (A) All conductors have high ohmic values in the circuit The current through the resistance is. Consider new charge + 4C is placed dm apart from old +4C charge and (x + 0.6) m apart from-16C charge. Watt-hour meter is classified as a: The guidelines for CBSE Class 9 are issued by the board and the NCERT. 3) The ratio of the Mechanical Impedance is, Explanation: We know that a force is analogous to voltage to the current, which is given as. (C) To reduce humming noise It is used to control the speed of various rotating devices like fans by controlling gate current with a circuit using Diac. (D) Dynamic braking with separate excitation, 45. Explanation: The retardation test is used for the calculation of the inertia of the rotor. The total resistance of the new circuit will be theequivalent resistance of the network. (C) The motor from the damage due to single phasing Each paper writer passes a series of grammar and vocabulary tests before joining our team. (C) 3000 watts within 10 light and fan points Force/Velocity = Mechanical impedance. (C) Perfectly constant temperature co-efficient of resistance 12) If the five bulbs having power ratings 5W,10W,25W,35W, and 50W, which one will have the highest resistance? Which must be equal to 5 Watts in order to make a total of 10 W. The voltage drop across each resistor = V, Multiplying these gives V2/R which is 4 times the series value of V2/4R. It has three terminals Gate and two Anodes. Explanation: The material Magnin does not change the resistance with varying temperature because Magnin has zero temperature coefficient, and the length of the alloy material does not change with temperature. (B) The lamp becomes less bright Itoccurs in aseriescircuit when the supply frequency causes the voltages across L and C to be equal and opposite in phase. The colour of light depends upon: However, when the bit is 0 i.e. JavaTpoint offers too many high quality services. 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Some electronic oscillators produce square or sawtooth waves. 4. (C) Leakage current beyond the stipulated value does not flow to earth I= Instantaneous value of current. All previous year question papers published on our blog / Website is collected form candidates memory. It is in fact an 8 pin integrated circuit which can produce double outputs-square wave and triangular wave. (B) Indicating instrument The design of the relaxation oscillator must include non-linear elements like the transistor, Op-Amp, or MOSFET and energy storing devices like capacitor and inductor.. To produce a cycle, the capacitor and inductor charge and Sold by Radioddity and ships from Amazon Fulfillment. Now, consider a shunt resistor Rs, which is connected in parallel to a galvanometer. unit magnetic permeance is ________. Its mandatory to do a science project as it is a part of the syllabus. A network element that is delivering power i.e. (A) Current drawn by an electronic circuit How the speed control of universal motor used for sewing machine is done? Where, P = power, W = work done and t = time. (D) Maintain steady speed and equal to driving torque, 21. It has a low forward voltage drop and fast switching response, so they are used in high-power applications such as high-power rectifiers. When capacitors are connected in series across DC voltage __________. (B) To give more uniform torque Though it is not a basic logic gate, its versatility and usefulness have made it into a standard logic gate. Above Curie temperature, it acts as a piezoelectric material. 49) In a ferromagnetic material, the neighboring atomic magnetic moments are. Copyright 2011-2021 www.javatpoint.com. A series RLC circuit takes leading power factor current at: Dummy coils are used with the machine's wave winding, and they are used when the winding is not met the standard winding. Transmitters (Lasers or LEDs) emit in infrared regions and are used as a light source for fiber transmission. Practical current source:A practical current source is equivalent to an ideal current source in parallel with high resistance or low conductance. While finding the equivalent resistance of the network, don't consider the internal resistance of the voltage source.

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