It has a parallel arrangement of the dipole and all dipoles become parallel after the applied electric field. Your Mobile number and Email id will not be published. (A) All conductors have high ohmic values in the circuit 52) The input voltage of a boost regulator is 8V, and the average output voltage is 24V. (C) Speed of light 28 2565! What is the electric field inside the material if the relative permittivity of dielectric material is 2? Flight prices: One way per person, based on 2 people travelling on the same booking. A.C. The ratio of the RMS value to the average value is known as the, Form factor for alternating quantity is 1.11. Xiegu CE-19 Data Interface Expansion Card for G90 , G1M, X5105, XPA125B. 1) Which of the given motor has insufficient starting torque at full load speed with the same H.P. 8) In a 3- induction motor, the starting current is 8 times the rated current, and the rated slip is 6 %, then find the ratio of starting torque to full load torque. Arc heating occurs when the air between electrodes of opposite polarity becomes: Home ITI Jobs Preparation ITI Electrician Questions and Answers. Force acted betweentwo charges is directly proportional to the product of their magnitude. (D) Brush axis coincides with the field axis, 72. It is represented mathematically by the equation: Both paramagnetic and diamagnetic material. When an ideal voltage source and an ideal current source in series. (B) Resistance (B) 800 watts within 2 outlets Refresh the page or contact the site owner to request access. (D) AC contains sine wave form, 49. (D) Due to all above reasons, 64. (B) Capacitance (D) Coupling angle, rotor speed and excitation, 68. (D) product of current in two conductors, 9. Practical voltage source:A practical voltage source consists of an ideal voltage source (VS) in series with internal resistance (RS) as follows. Some electronic oscillators produce square or sawtooth waves. The peak-to-peak value of an AC voltage is defined as the difference between its positive peak and its negative peak. (C) Limiting resistance The electrodes are made up of copper and are water-cooled. 2. (A) Uniform scale Buchholz relay is operated by: Which one of the following measurement CANNOT be done with multimeter? The basic principle on which the retardation test work is that when a motor is switched off from the power supply, it decelerates and come to rest. 1. (A) Inductance Explanation: LVDT stands for Linear Variable Differential Transformer. At the poles of magnet, the field is stronger because lines are crowded together there. (D) 3.4 metre, 40. This inverter is also known as quasi wave inverter. Explanation: Diversity factor refers to a ratio of the sum of individual maximum demand to the power plant maximum demand. Earthing in consumer premises is necessary to give protection against: Explanation: Under no-load conditions, the transmission line carrying a current because of the capacitance effect. (D) From the maximum starting current of motor, 78. When excessive heat is developed inside the transformer, it evaporates the oil, which turns into gas, proceeds to rise upwards because of convection. (A) one of the wattmeters gives zero reading Because tesla supports the AC system and it can transmit the AC power over a long distance. Inside the magnet, magnetic lines are directed from south to north. The correct answer is option 4) i.e. Two pin sockets should not be used in domestic wiring unless the appliance to be connected is: (D) Size of the conductor of the armature coil, 42. Learn Physics in a detailed manner with Vedantu.com and delve deeper into various branches of Physics like Mechanics, Optics, Thermodynamics, Electromagnetism, and Whentwo or more resistances are connected one after anothersuch that thesame current flows through themare calledresistances in series. Let the number of turns of the two coils be N1and N2respectively. There are mainlytwo waysof the combination of resistances: \(\frac{1}{R} = \frac{1}{{{R_1}}} + \frac{1}{{{R_2}}}\). Sanitary and Waste Mgmt. Which of the following effect proves the wave nature of light? (B) Double scott The magnetic field intensity (H) of a circular coil is given by, Where I is the current flow through the coil, Magnetic field intensity\(H = \frac{2}{{2 \times 0.5}} = 2\;A/m\), The magnetic field intensity (H) of a circular coil is given by\(H = \frac{I}{{2 R}}\). A series field winding connected in series with the armature and a shunt field winding connected in parallel to the armature. The output of the integrating amplifier is a triangular wave that has a frequency whose value is dependent on R1Cf. The magnetizing field strength due to long straight circular conductor is given by, r = Distance between current carrying conductor and the point (m), 0 = Absolute permeability= 4 10-7 H/m, \(B = {\mu _0}H = {\mu _0}\frac{I}{{2\pi r}} = 4\pi \times {10^{ - 7}} \times \;\frac{{250}}{{2\pi\times 5 \times {{10}^{ - 2}}}} = {10^{ - 3}}\), Magnetic flux density of coil is given by\(B = \;\frac{{{\mu _o}NI}}{{2R}}\) T, Magnetic flux density of solenoid is given by\(B = \;\frac{{{\mu _0}\;NI}}{l}\) T, Magnetic flux density of long straight wire\(B = \;\frac{{{\mu _0}I}}{{2\pi r}}\)T. The potential inside a charged hollow sphere is __________. In semiconductors, Si comes first, but unfortunately, it is not used to make LEDs. Trivalent impurity refers to an impurity that consists of 3 valance electrons and is shared with neighboring Si atoms to produce a p types semiconductor by producing a hole as a majority charge carrier. (B) The motor in case of fuse failure Flight prices in external advertising: One way per person, based on 1, 2 or 4 people travelling (as indicated) on the same booking. The working principle of aphotodiodeis, when a photon of ample energy strikes the diode, it makes a couple of an electron-hole. (D) Controlled by MCB, 60. What will happen to the filter circuit in battery charger if the output filter capacitor is opened? By going through the below-listed working models students will understand the concepts clearly and can also try making at it home. is increased What is the reason for this? All rights reserved. Along with this, we have also provided the Class 9 Science Lab Manual which contains the activities, science experiments and project works. It states thatthe magnitude of the electrostatic force F between two point charges q1and q2is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance r between them. It is in fact an 8 pin integrated circuit which can produce double outputs-square wave and triangular wave. Properties of Antiferroelectric Material: Two charges of + 4 C and -16C are separated from each other by a distance of 0.6 m. At what distance should a third charge of + 6 C be placed from + 4 C so that net force exerts on it will be zero? Where = linear charge density, r = radius of the cylinder, and o= permittivity of free space. Silicon (Si) and Germanium (Ge)are the best examples of intrinsic semiconductors. (B) The sending end (D) 400 volt, 16. Only 1 left in stock - order soon. (C) 180 out of phase Ideal and practical current sources are represented as shown in the below figure. The atomic number of Silicon is 14, whereas Germanium is 32 and has four electrons in its valence shell. The maximum efficiency of a transformer occurs when the copper loss becomes equal to the core loss. Material. This is known as magnetostriction. It has three terminals Gate and two Anodes. (C) Goes on increasing over after full load The law is limited to the following points : Which of the following statements aretrue about magnetic lines. Which part is provided in a battery charger to prevent the flow of excessive current into the battery? 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) AC resistance is more than DC resistance Flight prices: One way per person, based on 2 people travelling on the same booking. The magnetic field within the solenoid is uniform and parallel to the axis of the solenoid. Includes admin fee & airport taxes. more bandwidth and has standardized performance up to 10 Gbps and beyond, More bandwidth means that fibre can carry more information, very little signal loss occurs during transmission and data. (A) Introducing friction mechanism It is also inversely proportional to the square of the distance (C) Number of turns in the field winding (A) Rotor speed only A contactor coil is designed for 220V DC. Magnetostriction may be partially controlled by the transformer's design, but it cannot be totally eliminated. Principle: It is based on the principle of electromagnetic induction. (B) Shackle type (B) 1 kHz The charge of each capacitor is the same and the same current flows through each capacitor in the given time. The directionof the magnetic line of force is the direction of forceon a north pole. 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. The quality factor Q is defined as the ratio of the resonant frequency to the bandwidth, i.e. These important points will help you remember important concepts faster. Find the percentage series derating factor? (C) Spark will be produced in the commutator 16) The purpose of dummy coil in D.C. machine is. 10) In a series circuit, the value of resistance is 40 ohm, and Inductance is 40mH . Let coil A carries current I1and coil B carries current I2. Download PDF. are not changed with respect to current and voltage. (C) Leakage current beyond the stipulated value does not flow to earth 2) Which of the given networks are based on the compensation theorem? 40) Find the barrier potential for Si junction diode at 100 C, calculate its value at 400 C is 0.9 V, 41) An induction machine is operated with frequencies that are given in the ratio 3:7 without changing the voltage. The net Magnetic Field Density (Bnet) inside the magnetic material is due to: Note:More external factor (H) causes more internal factor (I). (D) Star/double delta, 53. The Nortons equivalent of the given network is: \({I_1} = \frac{{{I_N} \;\times\; {R_N}}}{{{R_N} \;+\; {R_L}}}\), \(2{R_N} + 6 = {I_N}{R_N}\) ---(1), \({I_1} = \frac{{{I_N}{R_N}}}{{{R_N} \;+\; {R_L}}}\), The circuit shown below is critically damped. (B) Under compounding A network of resistors is connected to a 16 V battery with an internal resistance of 1 , as shown in the figure. Q is directly proposal to the square of the current. (C) By ionisation in a gas or vapour (C) OL relay is not re-set 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. Where1= Lowerhalf-power frequencies The Magnetic field inside a solenoidis uniform. Rotor bars of squirrel cage rotor are sometimes skewed: Atdistance r from an infinitely long straightcurrent carrying conductor, magnetic fieldis: where B is the magnetic field, 0permeability of the mediumI is the current in the wire, and ris the distance from the wire to that point. Example of VCO is LM566 IC or IC 566. The power input increases by three times when the connection of three phase loads changes from star to delta at the same line voltage. Magnetic Field Strength (H):the amount of magnetizing force required to create a certain field density in certain magnetic material per unit length. Explanation: The primary reason for transformer noise is Magnetostriction. If the 100V of an A.C. source is connected to the circuit with 80Hz Frequency, find the value of current flowing through the resistance. f = frequency in Hz. 1. The force between two current-carrying parallel conductors: \(\frac{F}{l}=~\frac{{{\mu }_{0}}}{2\pi }\frac{{{i}_{1}}{{i}_{2}}}{d}\). In the event of power interruption, what happens is that the system is first maintained by the battery while the generator is started up. The colour of light depends upon: (A) By heating effect of current 39) When a 20 A current flows for 6 minutes, calculate the amount of electricity transferred. (C) 300 volt 12112 280 (A) Approximately 0 The value of susceptibility is positive and very small in the order of 10. Power It is defined as rate of doing work. When the number of poles and the number of armature conductors are fixed. The power factor of 3-phase load is less than 0.5. Here on the list, we have provided two science projects to help students to get an idea about what kind of project they can expect. When a magnetic field is applied parallel to the length of a ferromagnetic rod made of a material such as iron or nickel, a small elongation or contraction occurs in its length. Its minimum voltage rating should be: In addition, a triangular or square wave can also be used to represent the alternating current waveform. Chapter 7 of NCERT Solutions for Class 12 Physics comprehensively give answers to the questions asked in the textbook. 25) In an intrinsic semiconductor, the number of holes is . the number of electrons. In order to operate a fluorescent tube set on DC supply, which of the following additional auxiliary device is to be connected? 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. So, the schools affiliated to the CBSE board follows the NCERT syllabus. (B) Less than line current When a rewound armature is rolled on the surface of a leveled surface plate the armature stops at the same position of its periphery for each rolling, the portion of armature touching the surface plate is regarded to have: i.e., F1/r2where (F is Force, r is the distance between the charges). (A) Neon lamp Refresh the page or contact the site owner to request access. Above Curie temperature, it acts as paramagnetic material. In a generator maximum value of e.m.f. Two bulbs of rating 230 V, 60 W and 230 V, 100 W are connected in parallel across supply mains. (C) Brush axis is at 45 electrical to the field axis (B) Two wattmeter method (D) None of the above methods, 63. Thus it leads to a decrease in the level of oil in the conservator of the transformer. As load on induction motor increases its power factor: The net magnetic dipole moment is zero without an external magnetic field. The reason for using AC supply for resistance measurement is: (D) Overheating, 19. The standard equation of sinusoidal current wave is I = I max sin t. What is the magnetic flux density at distance r due to a long conductor carrying current of I? The phase difference between them is ________ degrees. Many obstructing panels are also fitted in the column to ensure proper and uniform mixing inside the tank. qA = + 4C at point A Coulombs Law is only valid when the distance between two charged particles is sufficiently larger than the size of both charges. Before going to the electrician interview, check the details about vacancies and the electrician interview questions. (C) Equal to line current Which method is generally adopted to measure the power in a three phase imbalanced load system? NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Political Science. (D) Integrating instrument, 59. (A) The distribution transformer unit for resistivity is the ohm-meter. (C) Thermal relay Determine the power delivered by the current source in the figure below: Power delivered by current source is given by. For example, if a student takes up science after their board exams, topics like mechanics and waves, etc. If the forefinger points in the direction of the magnetic field, the central finger points in the direction of motion of charge, then the thumb points in the direction of force experienced by positively charged particles.". What happens if it is connected to 220 V AC? (C) Keeping the magnetizing current to the minimum A good conducting material has less resistivity, whereas a bad conducting material or insulator has high resistivity. For 66 kV lines the number of insulator discs used is: (A) Centrifugal switch 1. (A) higher weight than the diametrically opposite portion (B) Proximity effect (B) Time selector switch Force/Velocity = Mechanical impedance. Practical current source:A practical current source is equivalent to an ideal current source in parallel with high resistance or low conductance. 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(B) Approximately 90 (B) Yellow It is used to control the speed of various rotating devices like fans by controlling gate current with a circuit using Diac. In a series RLC circuit, the net impedance is given by: From the above resonance curve, Bandwidth of the series resonant circuit is, Hence bandwidth of a series resonant circuit is the range offrequencies for which the circuit current is equal to or greaterthan 70.7% of the circuit current at resonance (i.e., I, Has the same properties as a current source alone, Has the same properties as a voltage source alone, Has the some properties as the source which has a higher value. It works as a transistor and controls the flow of current between Emitter and Collector by regulating current on Base. The relative permittivity of the vacuum is 1. Adjunct membership is for researchers employed by other institutions who collaborate with IDM Members to the extent that some of their own staff and/or postgraduate students may work within the IDM; for 3-year terms, which are renewable. As a result of the EUs General Data Protection Regulation (GDPR). The recent method of smooth speed control of a three-phase induction motor over a wide range is: They are weakly attracted to the external magnetic field. Two alternators are sharing an inductive toad equally. So, initial the force between two charges q1and q2is 200 N. \(F = k\frac{q_1 q_2}{r^2} = 200N\)-- (1), \(F' = k\frac{q_1 q_2}{r'^2} = k\frac{q_1 q_2}{(2r)^2}\), \(\implies F' = k\frac{q_1 q_2}{4r^2} = \frac{1}{4}k\frac{q_1 q_2}{(r)^2}\) ---(2), \(\implies F' = \frac{200N}{4} = 50 \ N\). We acknowledge the Images and Logos used here which do not under our copyright by providing the URL of the respective websites. (D) Not self starting, 28. (A) Depending on the nature of load (D) None of the above, 24. Find the number of transmission lines in the system, We know that, the equation to calculate transmission line, 58) A negative sequence really is usually used to protect. Required fields are marked *. GaAs (Gallium Arsenide) is used for making light-emitting diodes (LEDs). If 20 % of the output voltage is a feedback using its resistance negative feedback circuit, find the overall gain? (A) Coarse selector Check the multiple-choice questions for the 9th Class Physics Sound Chapter. The product of a vector quantity and a scalar quantity will always be a vector quantity. (C) 2.6 metre $34.99. (D) Residual magnetism in the pole will be destroyed, 7. (D) Lags V1 by an angle lying between 0 and 90, 55. Only 1 left in stock - order soon. Please read the question carefully it is mentioned in the question as well. (B) Sectionalizing and interleaving the primary and secondary winding (Angular frequency) = 2f. (B) The lamp becomes less bright It produces an electron as a majority charge carrier. (A) Inductance In repulsion motor, maximum torque is developed when: It is an electronic instrument used to find the EMF. Outside a magnet, magnetic lines are from north to south and insideit is south to north. 0=Resonance frequency is the geometrical mean of the two half-power frequencies 1,2, As shown in the figure, a 1 resistance is connected across a source that has a load line V + i= 100. (D) Only for very small copper loss, 62. Narrower the Bandwidth, more the Quality factor. The standard equation of sinusoidal current wave is I = Imaxsint. (D) By cathode ray omission. Explanation: Ferromagnetic materials refer to those substances which show permanent dipole moment even in the absence of an externally applied magnetic field. Though it is checked by experience experts but we are not taking any responsibilities about the correctness of contents. A well-evaluated syllabus describes each and every topic of textbooks with marking scheme. 52. (B) Number of armature coil Get it as soon as Thursday, Oct 27. I= Instantaneous value of current. (A) Overloading (D) Very low (practically constant) temperature co-efficient of resistance, 36. (B) There is no change in the induced e.m.f. (D) To provide mechanical balance to the rotor, 47. true - true - true. Schottky diode is called a hot-carrier diode. What are the two relative quantifies to be plotted for external characteristics curve for DC shunt generator? (D) Any place, 79. The middle line represents the unity power factor line and the right-hand side of the unity power factor line considered as lagging power factor line. Here, =resistivity; l = length and A = cross-sectional area. is, Explanation: We know the formula of Average to toque =m2(Rid - RIq) sin(2). (D) Dynamic braking with separate excitation, 45. For proper preparation, knowing the syllabus is very important along with solving various sample questions. What would be the transfer program execution to a given location? (D) No output voltage, 5. Class 9 sample papers for all the subjects will help students to get an idea of the marking scheme, important questions, difficulty level of the paper, time management, etc. ! Z = R + j (XL- XC) Therefore, the resistance of 60 W bulb (R60) is greater than the resistance of 100 W (R100) bulb. Anirreversible circuitis a circuit whose inputs cannot be reconstructed from its outputs. \(F = \frac{1}{4\pi _0}\frac{q_1 q_2}{r^2}\). When the value of is negative, the developed toque will be reversed, so the machine will act as a generator. is generated within the coil axis is at: Current in the circuit is independent of any element connected in series to it. ITI Electrician Questions and Answers Solved Papers are given here. (C) It will run without; any trouble (A) Frequency control method Triangular Waveform This signal proportionally moves in between low and high levels. Read on to find out. (C) 100 V The charge of each capacitor is different and the current flows through each capacitor in the given time are also different and depend on the value of the capacitor. (B) Goes on decreasing TheuseofACmakes the transmission of electrical power to great distances much more economical. Explanation: TRIAC stands for Triode for alternating current. Your Mobile number and Email id will not be published. If 5 A of electric current flows for a period of 3 minutes, what will be the amount of charge transferred? Understand the concepts in an easy and interesting way and finish your studies weeks before the exam so that you have enough time to revise. 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. So to help you with the same, below we have provided the CBSE Class 9 Textbook Solutions for Maths and Science. 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. (C) To enhance flux density Peak-to-peak value is the maximum voltage change occurring during one cycle of alternating voltage or current. In contrast, the non-linear network parameter changes with respect to current and voltage. The reason for flashing of display on millivoltmeter is that: As we are just required to find the flux linked with the second coil, and we are given that 80% of the flux produced byone coil links with the other. (D) Torque is too much hence it may cause damage, 35. (C) Hygrometer 1. \(F = K\frac{{{q_1} \times {q_2}}}{{{r^2}}}\). 31) In a power plant, the maximum demand is 100MW, and the sum of individual maximum demand is 70 M.W. 29) The displacement measuring Instrument LVDT works on the principle of. Learn the science & mystery of oceans in a masterclass with Tasneem Khan, a marine zoologist & diver with 1000+ dives! less (narrower) the bandwidth, more will be the Q value. (C) Controlled by ELCB (D) None of the above, 2. (A) the atmospheric condition (C) 10 \({i_1} = 50\sin \left( { t + \frac{\pi }{4}} \right)\), \({i_2} = 25\sin \left( {2\omega t - \frac{\pi }{6}} \right)\). Aerocity Escorts @9831443300 provides the best Escort Service in Aerocity. (B) the voltage of the service wires \(\frac{1}{{{R_{eq}}}} = \frac{1}{6} + \frac{1}{6} + \frac{1}{6}\), If an ideal voltage source and ideal current source are connected in series, the combination. A suitable XOR gate can be used as a pseudo-random number generator. This item: Radioddity G90 -H1 Bracket Holder Quiet Cooling Fan 2-in-1 for Xiegu G90 . 43) Which of the given test is used for the calculation of the inertia of the rotor? (A) Moving iron meter (D) Suspension type, 67.
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