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51. Define the meaning of the words in bold on the basis of their similarity with the Russian ones.

On the basis of their reaction to electrical field; spontaneous electrochemical phenomena; to be supplied to the ground by contact or by induction; be subdivided into galvanic electromagnetic and inductive electromagnetic methods; from 100 kilocycles to several megacycles; produced by corrosion of pipelines; different ion concentrations; equipotential lines; two unpolarizable electrodes; lines of equal potential; from an alternating current generator; in resistivity procedures; effect of subsurface conductors on emission characteristics; variations of field intensity; in the category of radio methods.

52. Pay attention to the pronunciation of the following words and word formations.

spontaneous

current - currently

circuit

steep - steeply

galvanic

distinguish - distinction

supply

solve - solution

fault

resolve - resolution

occur

limit - limitation

feature

emit - emission

external

potential - equipotential

straight

differ - different-difference

kilocycle - megacycle

compare – comparable – comparison

alter – alternating – alternative - alternation

owing to

induce – inductive - induction

vice versa

insulate – insulation - insulator

milliammeter

conduct – conductive – conductivity - conductor

furnish

combine – combination - combinability

alternating current

resist – resistance - resistivity

distinguish

polarize – polarizable - unpolarizable

stationary

energy – energize - energetic

53. Read the following word-combinations and translate them into Russian.

To be produced by direct or alternating current; bodies furnish their electrical field; to be supplied to the ground by contact or by induction

four frequency bands may be used; the audio-frequency range of from 200 to 1000 cycles; methods are usually subdivided into galvanic-electromagnetic and inductive-electromagnetic; radio-frequency range is used in the radio methods of electromagnetic prospecting; owing to the lack of depth penetration; resistivity and potential-drop-ratio methods are comparable to refraction methods; inductive methods are applied to the mapping of horizontal beds; spontaneous electrochemical phenomena occur on placers; to be produced on formation boundaries; difference in the conductivity of drilling fluid and formation waters; materials of different solution pressure; act as wet cells; survey equipotential lines or potential profiles.

54. Which word-combination is out of place here? And why?

a) alternating current, electrode spacing, direct current

b) supply, furnish, provide, induce

c) self-potential, surface potential, refraction, electromagnetic

d) compare, formation boundaries, comparable, comparison

e) pressure solution, low frequencies, high frequencies, radio frequencies

f) fault, inductive, external circuit, ground current

g) milliammeter, transmitter, current generator, field intensity

h) resistivity, flux line, potential-drop-ratio, self-potential, surface potential

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