![]() CATEGORIES: BiologyChemistryConstructionCultureEcologyEconomyElectronicsFinanceGeographyHistoryInformaticsLawMathematicsMechanicsMedicineOtherPedagogyPhilosophyPhysicsPolicyPsychologySociologySportTourism |
K. Put down the title corresponding to each of the given descriptions.
1. Titles: electric current; direct current; alternating current; continuous current.
__________ A current which always flows in one and the same direction __________ A flow of passage of electricity along an electric circuit, usually measured in amperes __________ A current which periodically alternates or reverses in direction. __________ A current uniform both in strength and in direction, a steady direct current.
2. Titles: energy; electric energy; chemical energy; radiant energy; kinetic energy; potential energy.
___________ The capacity of doing work. ___________ That part of the energy stored within an atom or molecule which can be released by a chemical reaction. ___________ The energy which a body possesses by virtue of its position. It is measured by the amount of work the body performs in passing from that position to a standard position in which the energy is considered to be zero. ___________ The energy which a body possesses by virtue of its motion. __________ The energy associated with electric charges and their movements. It is measu- red in watt seconds ( joules) or kilowatt-hours.
3. Titles: electric field; direct current; alternating current; electromagnetic radiation; continuous wave; electromagnetic spectrum.
___________ Radiation consisting of waves of energy associated with electric and magnetic fields. This radiation is emitted by matter in units called photons. ___________ The range of frequencies over which electromagnetic radiations are propagated. The lowest frequencies are radio waves, increases of frequency produce infrared radiation, light, ultra-violet radiation, X-rays, gamma rays and finally the radiation associated with cosmic rays. Radio or radar transmissions which are generated continuously and not in short pulses. ___________ An electric current flowing always in the same direction. ___________ A flow of electricity which, after reaching a maximum in one direction, decreases, finally reaching a maximum in the opposite direction, the cycle being repeated continuously. The number of such cycles per second is the frequency. ___________ The region near an electric charge, in which a force is acting on a charged particles.
4. Titles: two-phase system; single-phase system; three-phase system; poly-phase system.
_____________ An AC. distributing system employing a single phase at A.C. supplied by the generator. _____________ An A.C. distributing system utilizing a number of alternating currents differing in phase. _____________ An A.C. system employing three alternating currents of equal strength, differing in phase by one-third of a cycle. _____________ An A.C. system employing two alternating currents of equal strength, differing in phase by a quarter cycle, or such that one current has maximum strength when the other is passing through zero.
L. Arrange the following words in the pairs of synonyms.
a) 1. amount; 2. big; 3. matter; 4. application; 5. at present; 6.research; 7.to step down; 8. tube; 9.appliance; 10.minute; 11.arrow.
b) 1. investigation; 2.device; 3. needle; 4. quantity; 5. substance; 6.to lower; 7. small; 8. large; 9. new; 10. use;11. pipe.
M. Find nouns from the following words using suitable suffixes.
construct, develop, consider, distribute, deflect, equip, connect, require, produce, state, suit.
Date: 2014-12-28; view: 2247
|