2022 test questions and answers for the latest national fire facility operator (senior fire facility operator)

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1、 Common faults of combustible gas detection system circuit do not include (  )

A、 The combustible gas alarm controller has no display fault

B、 All combustible gas detectors in an alarm area are disconnected

C、 All combustible gas detectors in a circuit are disconnected

D、 A detector is out of line

answer ：B

analysis ： Common faults of combustible gas detection system circuit : The combustible gas alarm controller has no display fault. All combustible gas detectors in a circuit are disconnected. A detector is disconnected

2、 It was found that , The combustible gas alarm controller has no display , The reason why this failure is impossible is (  )

A、 The main power cord is not connected

B、 The standby power cord is not connected

C、 Fuse action ( damage )

D、 The detector is damaged

answer ：D

analysis ： The combustible gas alarm controller does not display the cause of failure :(1) The main power cord is not connected (2) The standby power cord is not connected (3) Fuse action ( damage ) Maintenance method :(1) Check insurance 、 Line condition (2) Reset / Replace the fuse

3、 The combustible gas detection and alarm system has a fault that all combustible gas detectors in a circuit are disconnected , The reason can't be (  )

A、 The power supply line of the detector is short circuited or disconnected

B、 The detector communication line is short circuited or disconnected

C、 The feedback line of the detector is short circuited or disconnected

D、 The circuit has a ground fault

answer ：C

analysis ： The reason why all combustible gas detectors in a circuit are disconnected :(1) The power supply line of the detector is short circuited or disconnected (2) The detector communication line is short circuited or disconnected (3) Maintenance method for grounding fault of this circuit :(1) Check the power supply of this circuit / Whether the communication connection line is disconnected , Connect the power supply of the circuit / Communication connection line (2) Check the power supply of the detector circuit with a multimeter / Whether there is a short circuit in the communication line , Check the short circuit fault (3) Use a megger ( Shake the watch ) Check the power supply of this circuit / The grounding resistance between the communication line and the earth . If the resistance value is less than the insulation requirements in the product manual, it is a ground fault , Use subsection method to check the grounding point of circuit and repair the grounding fault

 

4、 The combustible gas detection and alarm system has a fault that all combustible gas detectors in a circuit are disconnected , The following statement is not true ?(  )

A、 Check the power supply of this circuit / Whether the communication connection line is disconnected , Connect the power supply of the circuit / Communication connection line

B、 Check the power supply of the detector circuit with a multimeter / Whether there is a short circuit in the communication line , Check the short circuit fault

C、 Use a megger ( Shake the watch ) Check the power supply of this circuit / The grounding resistance between the communication line and the earth .

D、 If the resistance value is greater than the insulation requirements in the product manual, it is a ground fault , Use subsection method to check the grounding point of circuit and repair the grounding fault

answer ：D

analysis ： The reason why all combustible gas detectors in a circuit are disconnected :(1) The power supply line of the detector is short circuited or disconnected (2) The detector communication line is short circuited or disconnected (3) Maintenance method for grounding fault of this circuit :(1) Check the power supply of this circuit / Whether the communication connection line is disconnected , Connect the power supply of the circuit / Communication connection line (2) Check the power supply of the detector circuit with a multimeter / Whether there is a short circuit in the communication line , Check the short circuit fault (3) Use a megger ( Shake the watch ) Check the power supply of this circuit / The grounding resistance between the communication line and the earth . If the resistance value is less than the insulation requirements in the product manual, it is a ground fault , Use subsection method to check the grounding point of circuit and repair the grounding fault

5、 The combustible gas detection and alarm system has a fault that all combustible gas detectors in a circuit are disconnected , It is suspected that the communication line of the detector is short circuited , Which tool is needed to troubleshoot ?(  )

A、 Megger

B、 A multimeter

C、 Flow meter

D、 voltmeter

answer ：B

analysis ： When the detector communication line is short circuited , Check the power supply of the detector circuit with a multimeter / Whether there is a short circuit in the communication line , Check the short circuit fault .

6、 The combustible gas detection and alarm system has a detector disconnection fault , The following processing method is incorrect ?(  )

A、 Connect the power supply of the detector / Communication connecting line

B、 Check the power supply of the detector circuit with a multimeter / Whether there is a short circuit in the communication line , Check the short circuit fault

C、 Check the power supply of the detector with a multimeter / Communication connecting line ,

D、 If the detector still cannot return to normal working state , Replace the detector

answer ：B

analysis ： The cause of a detector disconnection failure :(1) The connecting wire of the detector is disconnected (2) How to repair the damage of the detector :(1) Check the power supply of the detector with a multimeter / Communication connecting line , Connect the power supply of the detector / Communication connecting line (2) If the detector still cannot return to normal working state , Replace the detector