Đề thi và đáp án : Tiếng Anh Chuyên ngành - ĐH Điện lực

TRUNGLUXURY.DOC
TRƯỜNG ĐẠI HỌC ĐIỆN LỰC
Khoa: HỆ THỐNG ĐIỆN
ĐỀ THI KẾT THÚC HỌC PHẦN
MÔN: TIẾNG ANH CHUYÊN NGHÀNH
Đề thi số: 1
Full name:……………………………
Class:…………………………………
I Multi-choice question
1. The current in a wire ………
a. depends only on the potential difference
applied
c. depends only on the resistance of the wire
b. depends on both resistance and potential
difference
d. does not depend on resistance and potential difference
2. One of the components in DC generators is :
a. primary winding b. brushes
c. secondary winding d. porcelain insulator
3. Electrical generating is concerned with:
a. power stations b. planes c. cables and switchgear d. roads and bridges
4. One of the components in transformer is
a. commutator b. brushes c. primary winding d. drive shaft
5. Hydroelectric power plants use water flowing directly through the turbines to power the …
a. motor b. dam c. generator c. reactor
II Use the words in the box to complete the paragraph
Fuses Fault equipment current switch
Milliseconds isolating withstand value Blow
If there is a …(1)… Fault in a piece of equipment then excessive current may flow. This will cause overheating
and possibly a fire; ….(2)… equipment protect against this happening. Current from the supply to the equipment
flows through the fuse. The fuse is a piece of wire which can carry a stated current; if the …(3)…rises above this

value it will melt. If the fuse melts (blows) then there is an open circuit and no current can then flow – thus
protecting the equipment by ……(4)… Fuses it from the power supply. The fuse must be able to carry slightly
more than the normal operating current of the …(5)… value to allow for tolerances and small current surges. With
some equipment there is a very large surge of current for a short time at … (6)…. milliseconds on. If a fuse is fitted
to ….(7)… current this large current there would be no protection against faults which cause the current to rise
slightly above the normal ……(8)… Therefore special anti-surge fuses are fitted. These can stand 10 times the
rated current for 10 … (9)… If the surge lasts longer than this the fuse will …(10)….
III Sentence building
Join the following groups of sentences to make the longer sentences. Use the words printed in italics at the
beginning of each group. You may omit words and make whatever changes you think are necessary in the word
order and punctuation of the sentences.
a Where
The electricity flows to a transmission station
In the transmission station, a transformer changes a large current and low voltage into a small current and high
voltage.
b If
These gases and particulates are not captured by some pollution control equipment
These gases and particulates are released into the atmosphere.
IV Translate words into English and make a sentence with each word
1 Động cơ điện
2 Vành góp
3 Hiệu điện thế
4 Nhà máy nhiệt điện
5 Cầu dao
V Reading and comprehension
Read the following text and answer the questions.
Electricity generation
Electricity generation is the process of generating electric energy from other forms of energy. The basic
method is still used today: electricity is generated by the movement of a loop of wire, or disc of copper between the
poles of a magnet. For electric utilities, it is the first process in the delivery of electricity to consumers. The other

processes, electricity transmission, distribution, and electrical power storage and recovery using pumped storage
methods are normally carried out by the electric power industry.
Electricity is most often generated at a power station by electromechanical generators, primarily driven by heat
engines fueled by chemical combustion or nuclear fission but also by other means such as the kinetic energy of
flowing water and wind. There are many other technologies that can be and are used to generate electricity such as
solar photovoltaics and geothermal power.
Central power stations became economically practical with the development of alternating current power
transmission, using power transformers to transmit power at high voltage and with low loss. Electricity has been
generated at central stations since 1881. The first power plants were run on water power or coal, and today we rely
mainly on coal, nuclear, natural gas, hydroelectric, and petroleum with a small amount from solar energy, tidal
harnesses, wind generators, and geothermal sources.
Small electricity generators are often powered by reciprocating engines burning diesel, biogas or natural gas.
Diesel engines are often used for back up generation, usually at low voltages. However most large power grids also
use diesel generators, originally provided as emergency back up for a specific facility such as a hospital, to feed
power into the grid during certain circumstances.
Unlike the solar heat concentrators, photovoltaic panels convert sunlight directly to electricity. Although
sunlight is free and abundant, solar electricity is still usually more expensive to produce than large-scale
mechanically generated power due to the cost of the panels.
Question:
1 Translate the first paragraph into Vietnamese?
1 What do the power plants nowadays run on?
2 What are the diesel generators used for?
3 Is the solar electricity cheap? Why?
TRƯỜNG ĐẠI HỌC ĐIỆN LỰC
Khoa: HỆ THỐNG ĐIỆN
ĐỀ THI KẾT THÚC HỌC PHẦN
MÔN: TIẾNG ANH CHUYÊN NGHÀNH
Đề thi số: 02
Fullname :
Class :

I Multi-choice question
1. The electric charge of an proton is equal to …
a. +1,602×10
-19
C b. -1,602×10
-17
C c. +1,602×10
-29
C d. -1,602×10
-27
C
2. One kilowatt hour of electrical energy is the same as….
a. 36 x 10
5
watts b. 10
5
watt c. 36 x 10
5
joules d. 36 megajoules
3. A circuit contains two un-equal resistances in parallel
a. current is same in both b. large current flows in larger resistor
c. potential difference across each is same d. smaller resistance has smaller conductance
4. In nature, energy cannot be created or ……, but its form can change.
a. destroyed b. increased b. destroying b. increasing
5. Filaments of electric bulbs are usually made of …
a. nichrome b. tungsten. c. copper d. carbon
6. An object or a piece of equipment that has been designed to do a particular job.
a. device b. tablet c. cupboard d. corner
7. …… is not the component in motor.
a. commutator b. field wingdings c. transformer d. drive shaft

8. A 160 V, 256 mW lamp has a working resistance of ……
a. 10
5
Ω b. 960 x10
2
Ω b. 960 Ω b. 10
2
Ω
9. ………is a passive electronic component consisting of a pair of conductors separated by a dielectric
a. inductance b. resistance c. capacitor d. insulator
10. Three 3 ohm resistors are connected to form a triangle. What is the resistance between any two of the
corners?
a. 3 / 4 Ω b. 3 Ω c. 2Ω d. 4/3 Ω
VI Use the words in the box to complete the paragraph
voltmeter low measuring resistance current
calibrated The oscilloscope in series multimeter deflected

An ammeter is an instrument used to measure … current (1)…and must be connected …. resistance (2)…
with the circuit. Since all the current in the circuit
passes through the ammeter, it must have a very ……
(3)… resistance.
A …(4)…is an instrument used to measure p.d.
and must be connected in parallel with the part of the
circuit whose p.d. is required. To avoid a significant
current flowing through it, a voltmeter must have a very
high…….(5)…….
An ohmmeter is an instrument for …….(6)
…… resistance
A…(7)…, or universal instrument, may be used to
measure voltage, current and resistance. An ‘Avometer’

and ‘Fluke’ are typical examples.
…….(8)… may be used to observe waveforms and to measure voltages and currents. The display of an
oscilloscope involves a spot of light moving across a screen. The amount by which the spot is …(9)… from its
initial position depends on the p.d. applied to the terminals of the oscilloscope and the range selected. The
displacement is ……(10)… in ‘volts per cm’.
VII Sentence building
Join the following groups of sentences to make the longer sentences. Use the words printed in italics at the
beginning of each group. You may omit words and make whatever changes you think are necessary in the word
order and punctuation of the sentences.
a. That
A direct-current (DC) generator is a rotating machine.
A rotating machine supplies an electrical output with unidirectional voltage and current.
b. Where
In the transmission station, a transformer changes a large current and low voltage into a small current and high
voltage.
The electricity flows to a transmission station.
VIII Translate words into English and make a sentence with each word
1 Pin quang điện
2 Máy cắt điện
3 Nhà máy thủy điện
4 Từ trường
5 Chổi than
IX Reading and comprehension.Read the following text and answer the questions.
Electric power system
An electric power system is a network of electrical components used to supply, transmit and use electric
power. An example of an electric power system is the network that supplies a region's homes and industry with
power - for sizable regions, this power system is known as the grid and can be broadly divided into the generators
that supply the power, the transmission system that carries the power from the generating centers to the load centers
and the distribution system that feeds the power to nearby homes and industries.
The majority of these systems rely upon three-phase AC power - the standard for large-scale power

transmission and distribution across the modern world. Specialized power systems that do not always rely upon
three-phase AC power are found in aircraft, electric rail systems, ocean liners and automobiles.
Most refrigerators, air conditioners, pumps and industrial machinery use AC power whereas most computers
and digital equipment use DC power (the digital devices you plug into the mains typically have an internal or
external power adapter to convert from AC to DC power). AC power has the advantage of being easy to transform
between voltages and is able to be generated and utilized by brushless machinery. DC power remains the only
practical choice in digital systems and can be more economical to transmit over long distances at very high
voltages).
The ability to easily transform the voltage of AC power is important for two reasons: Firstly, power can be
transmitted over long distances with less loss at higher voltages. So in power systems where generation is distant
from the load, it is desirable to step-up (increase) the voltage of power at the generation point and then step-down
(decrease) the voltage near the load. Secondly, it is often more economical to install turbines that produce higher
voltages than would be used by most appliances, so the ability to easily transform voltages means this mismatch
between voltages can be easily managed.
Question:
1 Translate the first paragraph into Vietnamese?
2 Where is power system not – AC found?
3 How can the digital devices use DC power?
4 How can power be transmitted over long distance?

Đề thi số: 02
I. Multi-choice question:
1. The current which flows when 1 coulomb is transferred in 10 ms is:
a. 1 A b. 10 A c. 10 mA d. 100 A
2. One of the components in transformer is.( Một phần thuộc máy biến áp là).
a. commutator b. brushes c. primary winding (cuộn sơ cấp)
d. drive shaft(ổ trục)
3. The free electrons of a metal …………………
a. do not collide with each other b. are free to escape through the surface
c. are free to fall into the nuclei d. are free to move anywhere in the metal

4. Hydroelectric power plants use water flowing directly through the turbines to power the …
a. motor b. dam c. generator c. reactor
5. The magnetic field B is defined from the magnetic force on a …….
a. moving charge b. static charge c. length of the conductor d.
voltage
6. Four cells each of e.m.f 'E' are joined in parallel to form a battery. The equivalent e.m.f of the
battery will be …….
a. 4 E b. E c. E/4 d. zero
7. The unit of magnetic field (in a small unit) are ….
a. Joule b. Gauss c. Bar d. Newton
8. When there is an electric current passing through a wire, the particles moving are ………
a. electrons b. protons c. atoms d. ions
9. PV cells are made of special materials called semiconductors such as ….
a. silicon b. copper c. teflon silicon
10. A conductor is a ………… which contains movable electric charge.
a. insulating b. insulator c. material d. materials
II. Use the words in the box to complete the paragraph
voltmeter low(3) measuring(6) resistance(2)
current(1)
calibrated The oscilloscope (8) in series multimeter (7)
deflected
An ammeter is an instrument used to measure …(1)…and must be connected ….(2)… with the
circuit. Since all the current in thecircuit passes through the ammeter, it must have a
very……(3)… resistance.
A …(4)…is an instrument used to measure p.d.
and must be connected in parallel with the part of the circuit
whose p.d. is required. To avoid a significant current flowing
through it, a voltmeter must have a very high…….(5)…….
An ohmmeter is an instrument for…….(6)…… resistance
A…(7)…, or universal instrument, may be used to

measure voltage, current and resistance. An ‘Avometer’ and
‘Fluke’ are typical examples.
…….(8)… may be used to observe waveforms
and to measure voltages and currents. The display of an
oscilloscope involves a spot of light moving across a screen.
The amount by which the spot is …(9)… from its initial position depends on the p.d. applied to
the terminals of the oscilloscope and the
range selected. The displacement is ……(10)… in ‘volts per cm’.
III. Sentence building
Join the following groups of sentences to make the longer sentences. Use the words
printed in italics at the beginning of each group. You may omit words and make whatever
changes you think are necessary in the word order and punctuation of the sentences.
a. That
A direct-current (DC) generator is a rotating machine.
A rotating machine supplies an electrical output with unidirectional voltage and
current.
b. Where
In the transmission station, a transformer changes a large current and low voltage into
a small current and high voltage.
The electricity flows to a transmission station.
IV. Translate words into English and make a sentence with each word
1. Năng lượng điện phân tán
2. Động năng
3. Công nghệ mới
4. Thiết bị điện
5. Nam châm điện
V. Reading and comprehension
Read the following text and answer the questions.
National Energy Grid - In Canada
Canada was the fifth-largest energy producer in the world in 2000, behind the United

States, Russia, China, and Saudi Arabia. Over
the past two decades, Canada has become a significant net energy exporter. In
2000, about 30% of Canadian energy production was
exported, with the United States by far its main customer.
OIL
From January through August 2002, the United States imported more oil (including
crude oil and petroleum products) from Canada
than from any other country. The United States also imported about 2.2 trillion cubic feet
(Tcf) of Canadian natural gas in the first seven
months of 2002, with 93% of total U.S. gas imports coming from Canada. In 2000, about
36% of Canada's primary energy production was natural gas, followed by oil (23%),
hydropower (20%), coal (11%), and nuclear power (4%). Over two-thirds of
Canada's energy is produced in the province of Alberta. Besides being a major producer,
Canada also is a significant energy consumer and a member of the
International Energy Agency (IEA). Canada was the world's fifth-largest energy consumer in
2000, roughly on par with India in terms of total energy consumption. Canada has the highest
energy intensity of any OECD country.
ELECTRICITY
Canadian electricity generation in 2000 totaled 567.1 billion kilowatt hours
(bkwh), of which 60% was hydropower, 26% was conventional thermal power (oil, gas,
and coal), 12% was nuclear generation, and 1% was derived from other renewable sources.
Canada was the largest producer of hydropower in the world in 2000, and hydro
sources are not yet believed to be fully exploited. Trends in coming years are
expected to favor thermal power generation, mainly from natural gas. Canadian nuclear output
has declined to 69.8 bkwh in 2000, compared to its peak of 102.4 bkwh in 1994. Ontario
contains the bulk of Canadian nuclear capacity. Canada exported about 38 bkwh of electricity
(gross) to the United States in 2001, mostly from Quebec, Ontario, and New Brunswick to New
England and New York. Smaller volumes are exported from British Columbia and Manitoba to
Washington state, Minnesota, California, and Oregon. There is considerable reciprocity between
the Canadian and U.S. power markets, as the United States also exports smaller volumes of

electricity to Canada (18 bkwh in 2001).
Question:
1. What kind of electricity does Canada rely on the most?
2. Does Canada produce more electricity than China?
3. Canada is the unique all over the world that does not use the nuclear power, isn’t it?
4. Does America produce the electricity in cooperation with Canada?
Đề 1
I. Multi-choice question
1. … are often driven by diesel engines for emergency standby.
a. Small mobile generators c. Fossil Fuel Power Plant
b. Nuclear Power Plant d. Transmission Substation
2. Remember that electrons have a negative … surrounding them.
a. Electrostatic field b. Magnetic field c. Electromagnet d. Magnet
3. … is used to describe the mathematical relationship between voltage, current and
resistance.
a. Omh’s Law b. Electrical Law c. Ohm’s Law
d. Electricity Law
4. The armature (in a simple dc motor) is made up of a loop of wire and ….
a. Bearings b. a commutator c. a field magnet
d. Brushes
5. … produced in a boiler turns a turbine to drive an electric generator.
a. Steam b. Spark c. Discharge d. Smoke
6. Calculate the power dissipated when a current of 4 mA flows through a resistance of
5kΩ ?
a. 8 W b. 80 mW c. 8 kW d. 80 MW
7. The current in a wire ………
a. depends only on the potential difference applied
b. depends on both resistance and potential difference
c. depends only on the resistance of the wire
d. does not depend on resistance and potential difference

8. ……is defined as the rate of doing work or transferring energy.
a. current b. voltage c. resistance d. power
9. One of the components in DC generators is :
a. primary winding b. brushes
c. secondary winding d. porcelain insulator
10. Electrical generating is concerned with:
a. power stations b. planes
c. cables and switchgear d. roads and bridges
II. Use the words in the box to complete the paragraph
energy density vector field a mixture electromagnetic fields the motion
photons the direction magnitude electric field volum
In physics, an electric field surrounds electrically charged particles and time-varying
magnetic fields. This …(1)… exerts a force on other electrically charged objects. Michael
Faraday introduced the concept of an electric field.
The electric field is a …(2)… with SI units of newtons per coulomb (N C−1) or,
equivalently, volts per metre (V m−1). The SI base units of the electric field are kg·m·s−3·A−1.
The strength or ….(3)… of the field at a given point is defined as the force that would be
exerted on a positive test charge of 1 coulomb placed at that point; the direction of the field is
given by ……(4)… of that force. Electric fields contain electrical energy with ….(5)….
proportional to the square of the field amplitude. The electric field is to charge as
gravitational acceleration is to mass and force density is to ….(6)…
An electric field that changes with time, such as due to … (7)… of charged particles in
the field, influences the local magnetic field. That is, the electric and magnetic fields are not
completely separate phenomena; what one observer perceives as an electric field,
another observer in a different frame of reference perceives as … (8)… of electric and
magnetic fields. For this reason, one speaks of "electromagnetism" or "….(9)……". In quantum
electrodynamics, disturbances in the electromagnetic fields are called … (10)…., and the energy
of photons is quantized.
III. Sentence building
Join the following groups of sentences to make the longer sentences. Use the words

printed in italics at the beginning of each group. You may omit words and make whatever
changes you think are necessary in the word order and punctuation of the sentences.
a. That
A direct-current (DC) generator is a rotating machine.
A rotating machine supplies an electrical output with unidirectional voltage and current.
b. Where
In the transmission station, a transformer changes a large current and low voltage into a small
current and high voltage.
The electricity flows to a transmission station.
IV. Translate words into English and make a sentence with each word
1. Máy biến áp tăng áp
2. Trạm phân phối
3. Động cơ điện
4. Tấm pin quang điện
5. Năng lượng gió
V. Reading and comprehension
Read the following text and answer the questions.
High-voltage direct current
Electric-power transmission is the bulk transfer of electrical energy, from generating
power plants to electrical substations located near demand centers. This is distinct from the local
wiring between high-voltage substations and customers, which is typically referred to
as electric power distribution. Transmission lines, when interconnected with each other, become
transmission networks.
High-voltage direct current (HVDC) is used to transmit large amounts of power over
long distances or for interconnections between asynchronous grids. When electrical energy is
required to be transmitted over very long distances, it is more economical to transmit using
direct current instead of alternating current. For a long transmission line, the lower losses and
reduced construction cost of a DC line can offset the additional cost of converter stations
at each end. Also, at high AC voltages, significant (although economically
acceptable) amounts of energy are lost due to corona discharge, the capacitance between phases

or, in the case of buried cables, between phases and the soil or water in which the cable is buried.
HVDC is also used for long submarine cables because over about 30 km length AC can
no longer be applied. In that case special high voltage cables for DC are built. Many submarine
cable connections – up to 600 km length – are in use nowadays.
HVDC links are sometimes used to stabilize against control problems with the AC
electricity flow. The power transmitted by an AC line increases as the phase angle between
source end voltage and destination ends increases, but too great a phase angle will allow the
generators at either end of the line to fall out of step. Since the power flow in a DC link is
controlled independently of the phases of the AC networks at either end of the link, this stability
limit does not apply to a DC line, and it can transfer its full thermal rating. A DC link stabilizes
the AC grids at either end, since power flow and phase angle can be controlled independently.
Question:
1. Translate the first paragraph into Vietnamese?
2. Where is HVDC used?
3. What are advantages of HVDC?
4. How can the HVDC be used to stabilize again control problems with the AC electricity
flow?