Description : The function of steel wire in ACSR conductors is (A) To take care of surges. (B) To reduce corona. (C) To reduce inductance. (D) To provide additional mechanical strength
Last Answer : The function of steel wire in ACSR conductors is To provide additional mechanical strength
Description : Why ACSR conductor is used for overhead lines?
Last Answer : It has high tensile strength
Description : "Expanded ACSR" are conductors composed of ?
Last Answer : "Expanded ACSR" are conductors composed of a fillter between the inner steel and the outer aluminium strands to increase the overall diameter of the conductor.
Description : The electrostatic stress in underground cables is (a) same at the conductor and the sheath (b) minimum at the conductor and maximum at the sheath (c) maximum at the conductor and minimum at the sheath (d) zero at the conductor as well as on the sheath (e) none of the above
Last Answer : (c) maximum at the conductor and minimum at the sheath
Description : In the cables, the location of fault is usually found out by comparing (a) the resistance of the conductor (b) the inductance of conductors (c) the capacitances of insulated conductors (d) all above parameters
Last Answer : (c) the capacitances of insulated conductors
Description : why we use aluminium conductor and not copper in transmission lines ?
Last Answer : Because copper conductor are costlier than aluminium conductor
Description : Aluminium conductor cables can be joined by (a) Gas welding (b) Soldering (c) Compression (d) Thermit welding
Last Answer : welding
Description : A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand?
Last Answer : A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand? 1 cm
Description : Which of the following materials is used for overhead transmission lines ? (a) Steel cored aluminium (b) Galvanised steel (c) Cadmium copper (d) Any of the above
Last Answer : (d) Any of the above
Description : Emulsifier protection is associated with: a) Grounding protection b) Dielectric strength protection of cables and conductors c) Lightning protection d) Fire protection
Last Answer : Ans: D
Description : Overhead lines generally use (a) copper conductors (b) all aluminium conductors (c) A.C.S.R. conductors (d) none of these
Last Answer : (c) A.C.S.R. conductors
Description : The advantage of cables over overhead transmission lines is (a) easy maintenance (b) low cost (c) can be used in congested areas (d) can be used in high voltage circuits
Last Answer : (c) can be used in congested areas
Description : The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is (a) proportional to 7 (b) proportional to X (c) proportional to distance between the conductors (d) inversely proportional to I
Last Answer : (b) proportional to X
Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.
Last Answer : Parts Insulating Materials Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils. ... Transformer bushings Porcelain Insulation between transmission line and pole. Porcelain
Description : In aluminium conductors, steel core is provided to (a) compensate for skin effect (b) neutralise proximity effect (c) reduce line inductance (d) increase the tensile strength
Last Answer : (d) increase the tensile strength
Description : In AC.S.R. conductors, the insulation between aluminium and steel conductors is (a) insulin (b) bitumen (c) varnish (d) no insulation is required
Last Answer : (d) no insulation is required
Description : The material generally used for armour of high voltage cables is (a) aluminium (b) steel (c) brass (d) copper
Last Answer : (b) steel
Description : A three phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to 'd'. if now the conductors of the line are rearranged to form and the equilateral triangle of sides equal to 'd' then?
Last Answer : A three-phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to 'd'. if now the conductors of the line are rearranged to form and an equilateral triangle of sides equal to 'd' then average capacitance and inductance will increase.
Description : Why cast aluminium tri-foil clamp is used in single core cables laying?
Last Answer : When three conductors are clamped together the fluxes around the conductors are get cancelled
Description : what is ACSR cable?
Last Answer : Answer: ACSR means Aluminum conductor, steel reinforced, e.g. 7/24 ACSR conductor has 7 steel strands forming a central core, around which there are two layers of aluminum strands(24).
Description : What is ACSR cable and where we use it?
Last Answer : ACSR means Aluminum conductor steel reinforced, this conductor is used in transmission & distribution.
Description : What Is Acsr Cable And Where We Use It?
Last Answer : ACSR is Aluminum conductor steel reinforced, this conductor is used in transmission & distribution.
Description : what is ACSR cable and where we use it?
Last Answer : A: ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution.
Description : cables are used for 132 kV lines. (a) High tension (b) Super tension (c) Extra high tension (d) Extra super voltage
Last Answer : (d) Extra super voltage
Description : With both ends of a three conductor cable disconnected and arranged without the conductors touching each other, an ohmmeter reading of 'zero' ohms between the ends of one conductor would indicate _____________. A. continuity B. a partial ground C. the resistance is infinite D. a short circuit
Last Answer : Answer: A
Description : If you disconnect and arrange both ends of a three conductor cable, without any contact between the individual conductors, an indicated ohmic value between the ends of a single conductor would indicate ... resistance C. the presence of a partial ground D. that the conductor is not short circuited
Description : Most of the high voltage transmission lines in India are (a) underground (b) overhead (c) either of the above (d) none of the above
Last Answer : (b) overhead
Description : The size of a conductor used in power cables depends on the (A) operating voltage. (B) power factor. (C) current to be carried. (D) type of insulation used.
Last Answer : (C) current to be carried.
Description : Bundled conductors are mainly used in high voltage overhead transmission lines to (a) Reduce line loss (c) Reduce corona (b) Reduce harmonics (d) Increase strength
Last Answer : Bundled conductors are mainly used in high voltage overhead transmission lines to Reduce corona
Description : Hollow conductors are used in the transmission lines to: (1) Improve heat dissipation (2) Reduce corona loss (3) Reduce skin effect (4) Reduce the line inductance
Last Answer : Hollow conductors are used in the transmission lines to: Reduce corona loss.
Last Answer : Copper conductors are generally used for transmission lines because it has longer life and high conductivity.
Description : Since fuse elements are made of zinc or any alloy of tin and lead, the melting point of the fuse element must be _____________. A. higher than that of copper B. lower than that of copper C. equal to that of copper D. reached when the conductor it is protecting becomes 'white hot.'
Last Answer : Answer: B
Description : Which of the following is not a transmission medium? a. telephone lines b. coaxial cables c. modem d. microwave systems
Last Answer : microwave systems
Description : The main limitation for power handling capability of short length transmission lines and cables is (A) power factor (B) stability (C) thermal effect limit (D) conductor size
Last Answer : The main limitation for power handling capability of short length transmission lines and cables is thermal effect limit
Description : While starting a main propulsion synchronous motor, the ammeter pegs out at maximum and then returns to the proper value after synchronization. This indicates the _____________. A. motor has started ... field windings are grounded C. slip rings are dirty D. power transmission cables are grounded
Description : What are the various kind of cables used for transmission?
Last Answer : Cables, which are used for transmitting power, can be categorized in three forms: • Low-tension cables, which can transmit voltage upto 1000 volts. • High-tension cables can transmit voltage upto 23000 volts. • Super tension cables can transmit voltage 66 kV to 132 kV.
Description : The material commonly used for sheaths of underground cables is (a) lead (b) rubber (c) copper (d) iron
Last Answer : (a) lead
Description : Which of the following methods is used for laying of underground cables ? (a) Direct laying (b) Draw-in-system (c) Solid system (d) All of the above
Last Answer : (d) All of the above
Description : In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted. (a) Yes (b) No
Last Answer : (a) Yes
Description : Underground cables are laid at sufficient depth (a) to minimise temperature stresses (b) to avoid being unearthed easily due to removal of soil (c) to minimise the effect of shocks and vibrations due to gassing vehicles, etc. (d) for all of the above reasons
Last Answer : (c) to minimise the effect of shocks and vibrations due to gassing vehicles, etc.
Description : Describe with sketches the process of laying of underground cables by the drawing in method.
Last Answer : OR Procedure: * A trench of minimum 60cm deep is made along with cable route. * Width of trench depends on number of conduits to be laid. * Separate pipes are ... enough to allow a person to enter into duct without difficulty. * Unarmored cables are used in this type.
Description : Draw and explain the construction of underground cables.
Last Answer : Underground cables: OR Explanation:- i) Core or conductor: * It function is carry current. * Cable may have single or more than single core conductor. * Conductor ... handling of cables. * It is similar to bedding & consists of fiborous material such as jute.
Description : State the four methods of laying of cable. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. (ii) ... is to be laid in the same trench, what should be minimum spacing between two cables ?
Last Answer : (i) Minimum clearance between cable and water pipe line when running in parallel:- 0.5 mtr. (ii) Minimum clearance between cable and water pipe line when running in parallel:- 0.5 mtr ... should be minimum spacing between two cables :- Then minimum 30 cm spacing is provided between 2 cables
Description : Multicore cables generally use (a) square conductors (b) circular conductors (c) rectangular conductors (d) sector-shaped conductors (e) none of the above
Last Answer : (d) sector-shaped conductors
Description : In a three-phase, squirrel-cage type, induction motor the rotating magnetic field is established by the _____________. A. current induced in the rotor windings B. application of a three-phase voltage ... caused by the induced current in the squirrel-cage bars with the magnetic field of the stator
Description : The part of a fuse that melts and opens the circuit is made of _____________. A. copper and antimony B. steel and babbitt C. aluminum or beryllium alloy D. zinc or an alloy of tin and lead
Last Answer : Answer: D
Description : Which of the following materials is not used for transmission and distribution of electrical power ? (a) Copper (b) Aluminium (c) Steel (d) Tungsten
Last Answer : (d) Tungsten