The tree of wisdom knows the answer to the conference class "Automobile Maintenance Technology".

The tree of wisdom knows the answer to the conference class "Automobile Maintenance Technology".

1. What is an electrically dangerous environment? ( )

A. Space containing uninsulated (bare) live parts

B. space containing IP2X connectors

C. Internal space of electric vehicle or hybrid vehicle

Correct answer: Space containing uninsulated (bare) live parts.

2. What are the main factors that aggravate the electric shock effect? ( )

A. Time for current to pass through human body

B. Body temperature

C. Present value

D. strength

Correct answer: Time when current passes through human body # Current value

3. What is the limit of AC detection? ( )

0.5 ma

B. 1 A

About 50 milliamps

D.30 ma

Correct answer: 0.5 mA

4. What is the 4.DC induction limit? ( )

0.5 ma

B. 1 A

C.2 ma

D.130ma

Correct answer: 2 mA.

5. What is the correct treatment sequence in electric shock accidents? ( )

A. Alarm, first aid, inspection and protection

B. Inspection, first aid, protection and alarm

C. First aid, protection, alarm and inspection

D. Protection, inspection, alarm and first aid

Correct answer: protection, inspection, alarm and first aid.

6. In the maintenance of new energy vehicles, it is forbidden for anyone to play with electrical equipment and switches.

A. correct

B. mistakes

Correct answer: a

7. High-voltage cables with damaged insulation on new energy vehicles can continue to be used after maintenance.

A. correct

B. mistakes

Correct answer: b

8. You can use the high-voltage power supply of the car body to supply power to electrical equipment other than electric vehicles.

A. correct

B. mistakes

Correct answer: b

9, thunderstorm weather, outdoor charging and vehicle maintenance are strictly prohibited.

A. correct

B. mistakes

Correct answer: a

10, if someone is found to get an electric shock, the power supply should be cut off immediately for rescue, and direct contact with the person who gets an electric shock is not allowed before being disconnected from the power supply.

A. correct

B. mistakes

Correct answer: a

1, the following symbol description and unit conversion about current, voltage and resistance are correct ().

A. the current is expressed by I, 1A= 1000mA.

B. the voltage is expressed in u, 1mV = 1000uV.

C. the resistance is expressed as r, 1M? = 106 ?

D. the resistance is expressed by p. 1k? = 103 ?

Correct answer: current is represented by I, voltage 1A= 1000mA# is represented by u, resistance 1Mv = 1000m # is represented by r, and resistance 1m? = 106 ?

2. There are three electrical components with resistances of 1 ohm, 2 ohms and 3 ohms connected in parallel. What is the total resistance after parallel connection? ( )

A.6/ 10

B. 10/6

C. 1 1/6

D.6/ 1 1

Correct answer: 6/ 1 1

3, 12 volt square wave signal in 30% PWM (pulse width modulation) modulation, the effective voltage is ().

A.2.4V

B.3.6V

C.4.8V

D.7.2V

Correct answer: 3.6V

4, if the grounding end of an actuator is controlled by the control unit, the following statement is correct ().

A when the actuator works, the grounding voltage measured at the grounding end of the actuator is 0V.

B when the actuator works, the grounding voltage measured at the grounding end of the actuator is the working voltage.

C when the actuator is not working, the grounding voltage measured at the grounding terminal of the actuator is 0V.

D, when the actuator is not working, the grounding voltage measured at the grounding end of the actuator is the working voltage.

Correct answer: When the actuator is working, the voltage to the ground measured by the actuator grounding terminal is 0V# When the actuator is not working, the voltage to the ground measured by the actuator grounding terminal is the working voltage.

5, the fault in the automotive electrical system is most likely to appear in ()

A. control components

B. Sensors

C. executing agency

D. wires, plugs, contacts, etc.

Correct answer: wires, plugs, contacts, etc.