200+ câu Trắc nghiệm Tiếng Anh chuyên ngành kỹ thuật điện có đáp án - Phần 5
25 câu hỏi
The ground conductor is usually grounded at the top of the supporting structure, to minimize the likelihood of direct ......... to the phase conductors.
overload currents
under voltage sags
short circuit currents
lightning strikes (sét đánh)
Chọn đáp án D
Electrical installation is concerned with ........
power stations
factories
roads and bridges
cables and switchgears
Chọn đáp án D
Which equipment is used to produce electricity?(thiết bị dùng để sản xuất điện)
Atransformer
Amotor
Acable
A generator (máy phát điện)
Chọn đáp án D
Write out R 2 + 15Ω = R 1 in full
Resistance two plus fifteen ohms equals resistance one.
R one minus R two equals fifteen ohms.
R two plus fifteen ohms is equal to R one.
R two plus fifteen multiplied by ohm is equal to R one.
Chọn đáp án C
Electric power network includes particular installations, substations, lines or cables for the transmission and distribution of………...
heat.
water.
electricity.
energy.
Chọn đáp án C
What is the main purpose of a distribution substation?
to convert mechanical energy into electricity
to generate electricity
to transfer power from the distribution system to the transmission system
to transfer power from the transmission system to the distribution system
Chọn đáp án D
Write out Y = in full
The reciprocal of Z is equal to Y.
Z is equal to the reciprocal of Y.
Y is equal to the reciprocal of Z.
The admittance is equal to the reciprocal of the impedance.
Chọn đáp án D
Three 3 ohm resistors are connected to form a triangle. What is the resistance between any two of the corners?
3/4 ohms
2 ohms
4/3 ohms
3 ohms
Chọn đáp án B
Jouleis the unit of
Impedance
Voltage
Energy
Current
Chọn đáp án C
Generation, transmission and distribution system are parts of .........
A consumer
A power plant
A substation
an electric power system
Chọn đáp án D
Generation of …… is a process whereby electrical energy is obtained from some other form of energy.
heat
fuel
electricity
steam
Chọn đáp án C
What is the electric power system?
Lines and transformers
Transmisstion systems
Loads
A very large network that links power plants to loads
Chọn đáp án D
Câu 10 What is the unit of mutual inductance? (Điện cảm)
Farad
Siemens
Ohm
Henry
Chọn đáp án D
What will be the value of a capacitor in farads when it has a capacitive reactance of 200 Ω and is connected to a 50Hz supply.
15,29uF
12,59uF
19,22uF
15,92uF
Chọn đáp án D
A conductor has a resistance of 10 Ω. It’s conductance is:
0.1 S
10S
0.1 mS
1 S
Chọn đáp án A
Electrical generating is concerned with ………….
Planes
Power station
Cables and switchgear
Roads and bridges
Chọn đáp án B
Power ......... comprise a number of conducting cores of copper or aluminium, insulation, and armouring.
towers
insulators
bare wires
cables
Chọn đáp án D
In transmission substations, the ........... is stepped up for transmission.
capacitance
power
current
voltage
Chọn đáp án D
the current in a wire………….
depends only on the resistance of the wire
does not depend on resistance and potential difference
depends only on the potential difference applied
depend on both resistance and potential difference
Chọn đáp án D
A coil of inductance 150mH and zero resistance is connected across a 100V, 50Hz supply. The current flowing through the reactance is :
2,72A
2,21A
2,27 A
2,12A
Chọn đáp án D
A coil which has an inductance of 40mH and a resistance of 2Ω is connected together to form a LR series circuit. If they are connected to a 20V DC supply. Which is the final steady state value of the current ?
1A
10A
0,1A
100A
Chọn đáp án B
If all of the plant's main generators are shut down, station service power is supplied by drawing power from the .... through the plant's transmission line.
plant's distribution line
power transformer
grid
feeder
Chọn đáp án C
............... are used to "transform" voltage from one level to another.
Motor
Generator
Transformer
Insulator
Chọn đáp án C
Where a substation has a metallic fence, it must be properly ........ , to protect people from this hazard.
distributed
isolated
maintained
grounded
Chọn đáp án D
Cogenerators are facilities that utilize heat for ........ electricity and for another form of useful thermal energy (steam or hot water).
distributing
maintaining
consuming
generating
Chọn đáp án D
