Dagong 21 autumn "power plant electrical part" online operation 1 [standard answer] power plant electrical part

Big work 21 autumn 《 Electrical part of power plant 》 Online homework 1
common 20 The total score of this question ：100 branch
In the answer
Single choice and judgment questions
One 、 A total of 10 topic ,50 branch
1
Text symbols for motors () To express .
AT
BM
CG
DFU
2
Text symbols for fuses () To express .
AC
BT
CG
DFU
3
The following items are not primary equipment ().
A Relay protection device
B motor
C transformer
D Adjust the camera
4
About the effect of heating on conductors and electrical appliances , It's wrong to say （）.
A Mechanical strength decreases
B The contact resistance increases
C The insulation performance is improved
D The tensile strength of the conductor decreases
5
What is not true about arc is ().
A Free gas
B Light weight
C The temperature is very low
D Easy to deform
6
Following options () It does not meet the economic requirements of the main electrical wiring .
A Reasonably select the main transformer
B The main wiring is simple
C Save installation costs
D Try to choose single-phase group transformer
7
The statement that there is a bus bar is wrong ().
A In case of bus fault or maintenance, the influence range is large
B The bus has the function of collecting and distributing electric energy
C The power distribution device covers a large area
D Less switching appliances are used
8
The wrong statement about the advantages of non segmented single bus is （）.
A Simple and clear
B High reliability
C Less equipment
D Small investment
9
The wrong statement about the characteristics of double bus connection is ().
A The power distribution device is simple
B Reliable power supply
C Flexible operation mode
D Expansion is convenient
10
The wrong statement about the characteristics of unit wiring is ().
A The wiring is simple
B The structure of power distribution device is complex
C High reliability
D Small footprint
Two 、 A total of 10 topic ,50 branch
1
The main wiring indicates the production of electric energy 、 Assemble 、 transformation 、 Allocation relationship and operation mode , Is a run operation 、 Basis of switching circuit .
A Yes
B wrong
2
The prime movers of thermal power plants are all diesel engines .
A Yes
B wrong
3
A hydropower plant is a plant that converts the potential energy and kinetic energy of water into electric energy , It is also called hydropower station by aopeng Dagong .
A Yes
B wrong
4
The function of synchronous generator is to convert electrical energy into mechanical energy .
A Yes
B wrong
5
The motor works according to the principle of electromagnetic induction .
A Yes
B wrong
6
In power plants and substations , A transformer used to deliver power to a power system or a user , It is generally called tie transformer .
A Yes
B wrong
7
When the angle wiring in the non confluence bus operates in closed loop , High reliability and flexibility .
A Yes
B wrong
8
In case of bus maintenance or failure , The disconnector is used as an electrical appliance for switching operation , It's easy to operate .
A Yes
B wrong
9
Circuit breakers and disconnectors are equipped with arc extinguishing devices .
A Yes
B wrong
10
When the arc current crosses zero , It's a good time to extinguish the arc .
A Yes
B wrong