70
Write a word that has the opposite meaning to given words
Decrease, low-level, closed circuit, short, insulator, cool, slower,
inadvisable, useless
Grammar
Look through the text again. What examples of participles can be
found in the text? Underline present participle with a straight line, past
participle with a wavy line
Put each verb in brackets into a suitable participle form
1.The problems ----- (discuss) at the conference are of great importance
for future research. 2. The subjects ----- (study) in the first year at the Institute
are: math, chemistry, descriptive geometry, English and others. 3. ----- (solve)
new problems scientists do a lot of research. 4. A force ----- (apply) to the body
was measured. 5.------ (make) these experiments we can compare the weight of
elements. 6. The engine ----- (test) required no improvement. 7. The professor --
--- (deliver) lectures on mathematics is a well-known specialist. 8. ----- (invent)
the digital technology solved the old problems of noise in signal transmission.
9. When ----- (insulate), the wire may be used as a conductor. 10. New alloys
have appeared during the last decades, among them a magnesium-lithium alloy
------ (develop) by our scientists.
TEXT B. FUSES
Complete this description of fuses, using the correct form of the verbs
in brackets
Fuses have the advantage of often ____ (be) less expensive and simpler
than a circuit breaker for similar rating. However, a blown fuse must
_____(replace) with a new device while a circuit breaker is simply reset. While
circuit breakers must ____(maintain) on an annual basis ___ (ensure) their
mechanical operation, this is not the case with fuses; no mechanical operation
____(require) for the fuse to operate under fault conditions. Old electrical
consumer units _____(fit) with so called Swiss electric fuses (6 to 10 A) and are
still in use in some older European buildings. Modern consumer units
______(contain) magnetic circuit breakers instead of fuses. Fuses often
____(characterize) as “fast-blow” or “slow-blow” according to the time they
____ (take) to respond to an overcurrent condition. A fuse also ____(have) a
