ELECTRICAL GURU - Statistics & analytics of Telegram channel @electricalguru

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💡💡Important💡💡 We have made this video to test colour blindness of RRB aspirants Please watch it in high quality If you feel that you are not able to see or identify any pattern then take a screenshot and send it to us. We will tell about the pattern. All must watch and check their eye health. Subscribe to our channel for more updates You can send screenshot to 👇 @electrical_guru Or electrical.guru@yahoo.com Link of the video is given below 👇👇👇👇👇 https://youtu.be/3QIfh22VNc0

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Aptitude_Guidelines_ALP.pdf

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https://youtu.be/Rf4LXOEUyu8

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maths-without-use-of-pen_pencil-_2.pdf27.12 MB

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81) If a number of resistors are connected in parallel, then the reciprocal of total resistance is equal to a. Sum of individual resistances b. Sum of the reciprocal of individual resistances c. Reciprocal of the sum of individual resistances d. All of these ANSWER: Sum of the reciprocal of individual resistances 82) The unit of electrical energy is / are a. Joules b. Watt - sec c. Kilowatt - hour d. All of these ANSWER: All of these 83) If a current of 5A flows through a resistor of 12 ohm then the power developed and the energy dissipated in 2 minutes are a. 300 W, 36000 J b. 360 W, 30000 J c. 380 W, 35000 J d. 380 W, 36000 J ANSWER: 300 W, 36000 J 84) Electrical work is a. Directly proportional to the potential difference b. Directly proportional to the charge c. Directly proportional to the current d. All of these ANSWER: All of these 85) According to Kirchoff’s voltage law, a. The algebraic sum of all the e.m.f’s in the circuit is zero b. Algebraic sum all the voltage drops in the circuit is zero c. Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero d. All of these ANSWER: Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero 86) If an external electric field is applied across the intrinsic semiconductor, then the a. More number of electron holes pair combination will be broken b. More number of electron holes pair combination will be evolved c. Less number of electron holes pair combination will be broken d. Less number of electron holes pair combination will be evolved ANSWER: More number of electron holes pair combination will be broken 87) At low temperature, the semi conductor behaves as a a. Perfect insulator b. Perfect conductor c. Perfect consulator d. None of these ANSWER: Perfect consulator 88) Valence electrons of silicon and germanium are a. 2, 4 b. 4, 4 c. 4, 2 d. 2, 2 ANSWER: 4, 4 89) To move electrons from valence band to conduction band, the energy applied to the insulator is a. Less than 15 eV b. Equal to 15 eV c. More than 15 eV d. More than 25 eV ANSWER: More than 15 eV 90) The atomic number of silicon and germanium is a. 32, 14 b. 12, 19 c. 14, 32 d. 19, 12 ANSWER: 14, 32 https://t.me/ElectricalGuru

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This is resized advertisement.. It will open on every device Many were complaining that CEN 01/2019 level-I were not opening on their device so we have reduced given file.

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cen-no-rrc01-2019-min.pdf

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Link of channel is given below... 👇👇👇👇 Please subscribe and hit the bell icon to recieve future video lectures and reviews https://youtu.be/3QIfh22VNc0

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What do you want see in RRB Je book publication review?

Anonymous voting

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A new video about the review of this book is coming soon..

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Arihant GK(Examthrill.com).pdf54.20 MB

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💡 IMPORTANT FOR RRB JE💡💡 🚆🚆🚇🚇🚝🚝 The coefficient of coupling is given by a. M / √(L2L1) b. M / (L2 L1) c. √(L2 L1) / M d. (L2 L1) / M ANSWER: M / √(L2L1) 72) If the magnetic field is stationary and the conductor is in motion then the emf induced is called a. Dynamically induced emf b. Statically induced emf c. Self induced emf d. Mutually induced emf ANSWER: Dynamically induced emf 73) Which among the following sentences is correct? a. Lenz’s law is used to find the direction of induced current b. Fleming’s right hand rule is used to find the direction of induced current c. Fleming’s left hand rule is used to find the direction of force d. All of these ANSWER: All of these 74) The induced emf sets up the direction of current in such a way that the magnetic field produced by it a. Supports the cause producing it b. Opposes the cause producing it c. Increases d. Decreases ANSWER: Opposes the cause producing it 75) When the flux crosses the air gap, it bulges outward at the ends of the air gap and the flux density in the air gap is reduced. This is known as a. Leakage flux b. Fringing c. Relative permeability d. Magnetizing force ANSWER: Fringing 76) According to the End Rule, the current directions when looked from one end of the coil if that end is South Pole and if the end is North Pole are a. Both clockwise b. Anticlockwise, clockwise c. Clockwise, anticlockwise d. Both anticlockwise ANSWER: Clockwise, anticlockwise 77) If two conductors carrying currents in opposite direction are placed parallel to each other then the magnetic field set up by the conductors a. Attract each other b. Repels each other c. Perpendicular to each other d. Parallel to each other ANSWER: Repels each other 78) When a solenoid attracts an iron bar, a. They leave the south pole to go around to the north pole b. They leave the north pole to go around to the south pole c. They leave the north pole to go to infinity d. They leave the south pole to go to the infinity ANSWER: They leave the north pole to go around to the south pole 79) The amount of flux density set up in the core is dependent upon a. Current b. No. of turns, cross sectional area of core c. Materials of the magnetic core, length of core d. All of these ANSWER: All of these 80) Permeability of a material is a. Directly proportional to both flux density and magnetizing force b. Directly proportional to flux density and inversely proportional to the magnetizing force c. Directly proportional to the magnetizing force and inversely proportional to the flux density d. Inversely proportional to both flux density and magnetizing force ANSWER: Directly proportional to flux density and inversely proportional to the magnetizing force https://t.me/ElectricalGuru

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When an ac power is applied to a reactive load, then the voltage is a. In phase with the current b. 90 degree out of phase with the current c. 180 degree out of phase with the current d. 270 degree out of phase with the current ANSWER: 90 degree out of phase with the current 62) If the number of turns, area and current of an ac circuit is doubled then the new inductance will be a. Equal to the former b. Twice of the former c. Four times the former d. Half of the former ANSWER: Four times the former 63) The phasor current through a 200 ohm resistor assuming a voltage of 200Arms at an angle of zero degree applied across it is a. 1Arms at an angle of zero degree b. 1Arms at an angle of 45 degree c. 1Arms at an angle of 90 degree d. 1Arms at an angle of 180 degree ANSWER: 1Arms at an angle of zero degree 64) A vector quantity has a. Only magnitude b. Only direction c. Both (a) and (b) d. None of these ANSWER: Both (a) and (b) 65) In ac circuitμ the maximum current required is a. Equal to the effective current b. 1.414 times the effective current c. Twice the effective current d. 1.732 times the effective current ANSWER: 1.414 times the effective current 66) The amount of work done in moving a charge from one point to another along an equipotential line or surface charge is a. Zero b. Infinity c. One d. Two ANSWER: Zero 67) For forming an electric dipole between two point charges separated by a small distance, the two point charges are of a. Unequal magnitude and opposite sign b. Unequal magnitude but same sign c. Equal magnitude and same sign d. Equal magnitude but opposite sign ANSWER: Equal magnitude but opposite sign 68) The potential difference between two points is given by a. V = E / Q b. V = W / Q c. V = Q / E d. V = Q / W ANSWER: V = W / Q 69) Gauss’s law is applicable for a. Only point charge b. Infinite line charge c. Infinite sheet of charge d. All of these ANSWER: All of these 70) “ Total electric flux through any closed surface is equal to the charge enclosed by that surface ”. This is a. Lenz’s law b. Gauss’s law c. Maxwell’s law d. Faraday’s law ANSWER: Gauss’s law https://t.me/ElectricalGuru

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The braking torque of induction type single - phase energy meter is a. Directly proportional to the flux b. Inversely proportional to the flux c. Directly proportional to the square of the flux d. Inversely proportional to the square of the flux ANSWER: Directly proportional to the square of the flux 52) The moving system of induction type single - phase energy meter consists of a. One pointer and two control spring b. One pointer and one control spring c. Two pointer and two control spring d. No pointer and no control spring ANSWER: No pointer and no control spring 53) In dynamometer type wattmeter, at equilibrium a. Tc > Td b. Tc < Td c. Tc = Td d. None of these ANSWER: Tc = Td 54) Among the following damping method, the most effective and efficient damping is a. Air friction damping b. Fluid friction damping c. Eddy current damping d. None of these ANSWER: Eddy current damping 55) In order to bring the pointer to rest within a short time, a. Gravity control is required b. Damping control is required c. Spring control is required d. All of these ANSWER: Damping control is required 56) For application in electric locomotives or for traction purposes, the most suitable motor is a. Dc series motor b. Differentially compounded motor c. Cumulatively compounded motor d. None of these ANSWER: Dc series motor 57) If the armature current of dc series motor has become twice then the torque will become a. Twice of the former b. Four times of the former c. One fourth of the former d. Remains same ANSWER: Four times of the former 58) The field winding of dc series motor consists of few turns of a. Thin wire with low resistance b. Thick wire with low resistance c. Thin wire with high resistance d. Thick wire with high resistance ANSWER: Thick wire with low resistance 59) When the motor runs on no load, then a. Back emf is almost equal to applied voltage b. Back emf will be greater than applied voltage c. Back emf will be less than applied voltage d. None of these ANSWER: Back emf is almost equal to applied voltage 60) If the number of conductors and speed of a lap wound generator is doubled then the generated emf will be a. Remains same b. Twice of the former c. Four times of former emf d. Half of the former emf ANSWER: Four times of former emf https://t.me/ElectricalGuru

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💡💡Important💡💡 We have made this video to test colour blindness of RRB aspirants Please watch it in high quality If you feel that you are not able to see or identify any pattern then take a screenshot and send it to us. We will tell about the pattern. All must watch and check their eye health. Subscribe to our channel for more updates You can send screenshot to 👇 @electrical_guru Or electrical.guru@yahoo.com Link of the video is given below 👇👇👇👇👇 https://youtu.be/3QIfh22VNc0

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The braking torque of induction type single - phase energy meter is a. Directly proportional to the flux b. Inversely proportional to the flux c. Directly proportional to the square of the flux d. Inversely proportional to the square of the flux ANSWER: Directly proportional to the square of the flux 52) The moving system of induction type single - phase energy meter consists of a. One pointer and two control spring b. One pointer and one control spring c. Two pointer and two control spring d. No pointer and no control spring ANSWER: No pointer and no control spring 53) In dynamometer type wattmeter, at equilibrium a. Tc > Td b. Tc < Td c. Tc = Td d. None of these ANSWER: Tc = Td 54) Among the following damping method, the most effective and efficient damping is a. Air friction damping b. Fluid friction damping c. Eddy current damping d. None of these ANSWER: Eddy current damping 55) In order to bring the pointer to rest within a short time, a. Gravity control is required b. Damping control is required c. Spring control is required d. All of these ANSWER: Damping control is required 56) For application in electric locomotives or for traction purposes, the most suitable motor is a. Dc series motor b. Differentially compounded motor c. Cumulatively compounded motor d. None of these ANSWER: Dc series motor 57) If the armature current of dc series motor has become twice then the torque will become a. Twice of the former b. Four times of the former c. One fourth of the former d. Remains same ANSWER: Four times of the former 58) The field winding of dc series motor consists of few turns of a. Thin wire with low resistance b. Thick wire with low resistance c. Thin wire with high resistance d. Thick wire with high resistance ANSWER: Thick wire with low resistance 59) When the motor runs on no load, then a. Back emf is almost equal to applied voltage b. Back emf will be greater than applied voltage c. Back emf will be less than applied voltage d. None of these ANSWER: Back emf is almost equal to applied voltage 60) If the number of conductors and speed of a lap wound generator is doubled then the generated emf will be a. Remains same b. Twice of the former c. Four times of former emf d. Half of the former emf ANSWER: Four times of former emf https://t.me/ElectricalGuru

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41) For extinguishing arc in an high voltage fuses, the element can be immersed in a. Oil b. Carbon tetrachloride c. Carbon tetrafloride d. Only (a) and (b) ANSWER: Only (a) and (b) 42) In HRC fuses, the space within the body surrounding the element is usually filled with a. Silver b. Zinc c. Quartz d. Copper ANSWER: Quartz 43) The wrong statement among the following is a. A fuse can be fitted in an outlet socket b. A fuse should not get overheated c. The current rating of fuse should not exceed the rating of the smallest cable protected d. Fuse having rating less than 3 A can be used in radio ANSWER: A fuse can be fitted in an outlet socket 44) The fusing current of a fuse depends on its a. Material and its length b. Length and its diameter c. Material and diameter d. Material, length and diameter ANSWER: Material, length and diameter 45) For improving the soil condition and efficiency of earthing system, the pit area around the G.I. pipe is filled with a. Mixture of copper and nickel b. Mixture of chloride and sodium c. Mixture of aluminium and sulphate d. Mixture of salt and coal ANSWER: Mixture of salt and coal 46) For solving parallel ac circuit, the method used is a. Vector method b. Admittance method c. Symbolic or j - method d. All of these ANSWER: All of these 47) The net power in a series R-C circuit is a. Zero b. Positive c. Negative d. None of these ANSWER: Positive 48) The product of rms values of current and voltage is called as a. Real power b. Apparent power c. Reactive power d. Polar curves ANSWER: Apparent power 49) The power absorbed by a pure inductive circuit and pure capacitive circuit is a. Zero and non zero b. Non zero and zero c. Non zero and non zero d. Zero and zero ANSWER: Zero and zero 50) The power curve for a purely resistive circuit is zero only when a. Current is zero b. Voltage is zero c. Both current and voltage is zero d. None of these ANSWER: Both current and voltage is zero https://t.me/ElectricalGuru

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The number of cycles of the induced emf per second is equal to a. No. of cycles per revolutions x no. of revolutions per second b. No. of cycles per second x no. of revolutions per second c. No. of cycles per revolutions x no. of revolutions per hour d. No. of cycles per revolutions / no. of revolutions per second ANSWER: No. of cycles per revolutions x no. of revolutions per second 32) The non salient pole type synchronous generator is driven by a. Hydraulic turbines b. Diesel engines c. Steam engines d. All of these ANSWER: Steam engines 33) In India, the synchronous generator generates a. 11 kilo - volts b. 33 kV c. 66 kV d. Either (a) or (b) ANSWER: Either (a) or (b) 34) The synchronous generator is also called an a. AC generator b. Alternator c. DC generator d. Only (a) and (b) ANSWER: Only (a) and (b) 35) From full load to no load, the change of terminal voltage is more in case of a. Lagging power factor b. Leading power factor c. Unity power factor d. Both lagging and leading power factor compared to unity power factor ANSWER: Both lagging and leading power factor compared to unity power factor 36) In a balanced 3-phase system, if one of the two wattmeter’s reading is negative then the a. Reading should be taken as it is b. Reading should be taken after reversing the pressure coil c. Reading should be taken after reversing the current coil d. All of these ANSWER: Reading should be taken after reversing the pressure coil 37) The two wattmeter method is applicable for a. Only star connected system b. Only delta connected system c. Both star connected and delta connected system d. None of these ANSWER: Both star connected and delta connected system 38) By using two wattmeter method, power can be measured in a. 3 - phase, 2 - wire system b. 3 - phase, 3 - wire system c. 3 - phase, 4 - wire system d. All of these ANSWER: 3 - phase, 3 - wire system 39) In delta connected system, the potential difference between line outers is a. Equal to the phase voltage b. Greater than the phase voltage c. Less than the phase voltage d. None of these ANSWER: Equal to the phase voltage 40) The expression for total power output of a delta connected system in terms of phase voltage and current is given by a. 3VpIpcos∅ b. √3VpIpcos∅ c. 1/√ 3VpIpcos∅ d. 1/3 x VpIpcos∅ ANSWER: 3VpIpcos∅ https://t.me/ElectricalGuru

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21) Slip ring induction motor has a. Low starting torque b. Medium starting torque c. High starting torque d. None of these ANSWER: High starting torque 22) The frequency of rotor current in an induction motor is a. slip times the frequency of stator current b. slip times the frequency of supply c. One by slip times the frequency of stator current d. One by slip times the frequency of supply ANSWER: slip times the frequency of supply 23) Slip of an induction motor increases with a. increase in current and decrease in torque b. increase in current and torque c. decrease in current and torque d. decrease in current and increase in torque ANSWER: increase in current and torque 24) In an induction motor, rotor speed is always a. Less than the stator speed b. More than the stator speed c. Equal to the stator speed d. None of these ANSWER: Less than the stator speed 25) The frequency of the induced emf in an induction motor is a. Greater than the supply frequency b. Lesser than the supply frequency c. Same as the supply frequency d. None of these ANSWER: Same as the supply frequency 26) The efficiency of the transformer will be maximum when a. Iron losses is equal to the twice of the copper losses b. Copper losses is equal to the twice of the iron losses c. Iron losses is equal to the copper losses d. All of these ANSWER: Iron losses is equal to the copper losses 27) Copper losses is proportional to a. kVA b. square of kVA c. cube of kVA d. none of these ANSWER: square of kVA 28) If the transformer is loaded then the secondary terminal voltage falls for and rises for a. Lagging power factor, leading power factor b. Lagging power factor, unity power factor c. Unity power factor, lagging power factor d. Leading power factor, lagging power factor ANSWER: Lagging power factor, leading power factor 29) Efficiency of a transformer is maximum at a. Leading power factor b. Lagging power factor c. Unity power factor d. None of these ANSWER: Unity power factor 30) Copper losses occurs due to ohmic resistance in a. Primary winding b. Secondary winding c. Both primary and secondary winding d. None of these ANSWER: Both primary and secondary winding https://t.me/ElectricalGuru