1. Bundled conductors are used to (a) reduce inductance of the line. (b) reduce both inductance and capacitance. (c) reduce corona loss. (d) reduce corona loss and the line inductance. 2. A 3-phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to ‘d.’ If now the conductors of the […]
1. A 3 -phase, 4-wire system is commonly used for (a) primary distribution. (b) secondary distribution. (c) primary transmission. (d) secondary transmission. 2. The rated voltage of a 3-phase power system is given as (a) RMS phase voltage. (b) peak phase voltage. (c) RMS line to line voltage. (d) peak line to line voltage. 3.
1. The main objectives of load frequency control in a power system are: to bring the steady state error to zero after load change. to maintain the net tie-line flow. to maintain voltages on all buses. to economize the cost of generation. (a) 1 and 2. (b) 2 and 3. (c) 3 and 4. (d)
1. Seeding material commonly used in MHD generator is (a) sodium. (b) aluminum. (c) potassium. (d) cesium. 2. Which of the following liquid metal is not used as an MHD working fluid ? (a) Potassium. (b) Sodium (c) Lithium (d) all of the above 3. The exhaust from an MHD generator is at a temperature
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1. Western U.P, Rajasthan, Punjab, Haryana, Tamil Nadu are quite suitable areas for (a) hydroelectric power plants. (b) steam power plants. (c) nuclear power plants. (d) all of the above. 2. One atomic mass unit (amts) is approximately equal to (a) 1.66 x 10-24 kg (b) 1.66 x 1027 kg (c) 1.6 x 1019 kg
1. Within the boiler, the steam has highest temperature in (b) water tubes. (a) super-heater (c) water walls. (d) water drum. 2. Which of the following enters the superheater ? (a) Superheated steam. (b) Wet steam. (c) Hot water. (d) Cold water. 3. Superheated steam is always (a) at a pressure more than that of
1. The commercial sources of energy are (a) fossile fuels, water and radioactive substances. (b) solar, wind, biomass. (c) wood, animal wastes and agricultural wastes. (d) none of the above. 2. Which of the following power plants is the least reliable ? (a) Wind. (b) Tidal. (c) Geothermal. (d) Solar. 3. Which of the following
1. Aluminium does not corrode in atmosphere because (a) it is a noble metal. (b) atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of the aluminium. (c) it does not react with oxygen. (d) all of the above. 2. Carbon is………..material. (a) conducting (b) dielectric (c)
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1. The tiny block formed by the arrangement of a small group of atoms is called the (a) space lattice. (b) unit cell. (c) cubic cell. (d) primitive cell. 2. A unit cell is (a) a unit cube containing the smallest number of atoms. (b) a group of atoms which forms the cubic structure. (c)
1. Output coefficient of induction motor is given as (a) output/active volume of machine (b) active volume of machine /output (c) output/input (d) input/output 2. If the stator winding of a 3-phase induction motor is delta connected, the rotor winding (a) should be delta connected. (b) should be star connected. (c) should not be delta