Boiler Fireman Examination Papers (Basic Papers)

First, fill in the blanks:
1. The boiler operator must hold the valid boiler operator certificate when operating the boiler, and bear the corresponding responsibility for the accident caused by illegal operation.
2. When the boiler operator finds any abnormal phenomenon and endangers the safe operation, he/she shall take emergency measures and report to the responsible person in time.
3, the furnace personnel for any harmful boiler safety command, have the right to refuse to carry out, and timely report to the local safety supervision organization.
4. Gas is a mixture of combustible gas and non-combustible gas.
5, the basic condition of fuel combustion is combustible, air and temperature three indispensable.
6. The main function of the drum is to collect, store, purify steam and supplement water supply.
7. The steam temperature indicated on the nameplate of the steam boiler refers to the saturated steam temperature under rated pressure of the boiler without superheater. For a boiler with a superheater, the temperature of the steam at the outlet of the superheater.
8. When the staller operates the boiler, the pressure indicated by the pressure gauge shall not exceed the pressure indicated on the boiler nameplate.
9. The water circulation of the boiler is divided into two kinds: natural circulation and forced circulation.
10, commonly referred to as the boiler three safety accessories are the safety valve, pressure gauge and water level gauge.
11, when the boiler overpressure, the safety valve can play a pressure relief and alarm role.
12. The water level gauge shall have clear signs indicating the highest and lowest safe water levels.
13, water level alarm is when the boiler water level is higher than the highest safe water level or lower than the lowest safe water level can automatically send an alarm device.
14, the commonly used water level alarm in the form of a floating ball type magnet and electrode type three.
15. Impurities in natural water can be divided into three categories: suspended matter, colloidal matter and dissolved matter according to particle size.
16. The whole operation of ion exchange water treatment consists of four stages: backwash, reduction, forward wash and exchange.
17. When the water level gauge does not move, it should immediately check whether the connections and channels in the water level gauge are blocked.
Safe operation of boilers mainly includes close monitoring of water level, pressure and temperature and correct adjustment of combustion.
19. The daily operation of the boiler mainly includes flushing water level gauge and pressure gauge, sewage discharge and testing safety valve, etc.
20. The operation items during the boiler pressure boost include flushing water level gauge and pressure gauge water trap pipe, checking whether there is leakage at each connection, trying out water supply equipment and sewage discharge device, heating pipe and other work before steam.

Two, the judgment question:
1. Screw connection of boiler drain valve is not allowed (√)
2. When several boilers share the sewage main, each boiler can discharge pollution at the same time. (x)
3. The smaller the explosion limit range of gas, the lower the lower limit, the greater the risk. (x)
4. The voltage regulator of the gas system has the function of depressurizing and stabilizing the pressure. (fx)
5. The "reset button" is the reboot button. (x)
6, usually contains calcium, magnesium salt water is called hard water. (x)
7. Units that use boilers shall register their boilers one by one with the local safety supervision institutions. (fx)
8, when the burner motor power, the interlock protection device can automatically cut off the gas supply. (fx)
9, boiler operation, if all the safety valve failure, but the pressure gauge is normal, still can continue to operate. (x)
10, the newly purchased pressure gauge, without inspection shall not be installed and used. (fx)
11. The larger the explosion limit range of gas, the smaller the explosion risk. (fx)
12. The main function of regular sewage discharge is to remove high concentration of boiler water at the bottom of the boiler. (fx)
The switch of the solenoid valve is realized by the electromagnetic force. (fx)
14. Leak detection of the gas system should be carried out once a week. (x)
15. The safety valve on the boiler should be inspected at least once every two years. (x)
16. When the two safety valves on the drum are overpressure, they should start jumping and exhaust at the same time. (x)
When the boiler is seriously short of water, water should be replenished immediately. (x)
The heat produced by the boiler per hour is called the boiler thermal efficiency. (x)
19. The pressure indicated on the nameplate of the boiler is gauge pressure. (x)
20, boiler sewage should be carried out at low load. (fx)

Three, multiple choice questions:
1, commonly used steam boiler output unit is (A)
A, T/H B, MW C, Kcal/H D, KJ/H
2. The pressure shown on the boiler pressure gauge is (C).
A. Absolute pressure B. Atmospheric pressure C. Relative pressure D. Vacuum pressure
3. During boiler operation, the part where the actual air supply for fuel is more than the theoretical air quantity is called (B).
A, excess air coefficient B, excess air volume C, ventilation coefficient D, ventilation volume
4, the most suitable for steam boiler safety valve form is (B)
A, micro open B, full open C, spring D, lever type
5. The inspection cycle of the safety valve in use is (B).
A, half A year B, one year C, one and A half D, two years
6, the pressure gauge calibration period, the longest should not exceed (B)
A, 3 months B, 6 months C, 9 months D, 12 months
7. When the pressure gauge pointer pulsates during boiler operation, it should (D)
A. To repair B. To reduce combustion C. To flush the pressure gauge D. To stop the use of the pressure gauge
8. In order to ensure the sensitivity and reliability of the electrode type water level alarm, it shall (C)
A. Regularly drain B. Regularly inspect C. Regularly clean D. Regularly replace
9. When the water level alarm gives an alarm, the way to judge whether the boiler is full of water or short of water is (B).
A, observe the water level B, according to different signals C, according to different signs D, according to boiler load
10. The water level at which the low water level interlock protection device operates shall be (C).
A, lower limit of normal water level B, low water level C, lowest water level D, visible edge at the lower part of water level gauge
11, cause the boiler heating surface to form scale ion is (D)
A, calcium B, sodium C, magnesium D, calcium
12, commonly used boiler chemical treatment of ion exchange method is (A)
A, sodium B, HG C, negative D, positive
13. The simple control method of low-pressure boiler discharge is to control its (A)
A, water level drop height B, drain valve opening time C, drain valve opening size D, pressure drop value
14, the working pressure of low pressure boiler is generally not higher than (C).
A, 1.0 MPa B, 1.25 MPAC, 2.5 MPa D, 3.8 MPa
15, boiler feed water pH should be (D)
A, B, C, D, 5
16. During the operation of the boiler, the water supply continues to increase and the water level continues to decline.
A, Start the backup water pump B, Reduce the steam load C, Open the water supply valve D, Stop the boiler immediately
17. In order to ensure the ignition safety of oil and gas boilers, boilers should be installed (D)
A, explosion-proof door B, flameout program controller C, spark ignition D, ignition protector
18. When the monitoring boiler is started, the oil and gas boiler shall be installed (D)
A, fire hole B, ignition program controller C, explosion-proof door D, flameout protection device
19. When the gas boiler starts, press the start button, and the burner motor does not turn, which may be (BD) (multiple options).
A. Gas pressure is too low and self-locking B. Voltage is not self-locking C. Solenoid valve leakage and self-locking D. Power supply thermal relay disconnection E
20. When the gas boiler is started, the flame is lit for a few seconds and then extinguished, which may be (BC) (multiple options)
A, the air volume is too large B, the solenoid valve closed C, the air pressure is too low D, the gas pressure is too low E, the servo motor stopped F, the butterfly valve closed

4. Short answer questions:
1. Brief description of common faults of pressure gauges?
(1) The pointer does not return to zero
(2) The needle does not move
(3) the surface is unclear or there are water drops
(4) pressure gauge pointer jitter

2. Common faults of the safety valve?
(1) the safety valve leaks air
(2) the safety valve is not opened when it exceeds the specified pressure
(3) the safety valve is not open under the specified pressure
(4) the valve disc does not return to the seat after exhaust

3. How to rinse the pressure gauge?
Answer: turn the three-way cock connecting the pressure gauge to the position through the atmosphere, release the stored water, turn to the original position after returning to the steam, and confirm whether the pressure value is accurate.

4. How long should the pressure gauge and safety valve be checked?
(1) The pressure gauge is checked every six months
(2) the safety valve is checked once a year

5. What causes the corrosion of the boiler?
(1) the metal is often eroded by steam, water or humid air, resulting in oxidation corrosion
(2) the furnace water contains dissolved gases and impurities, causing acid, alkali, salt and other chemical corrosion
(3) damp ash and coal cinder contain sulfur, causing acid corrosion

6. What caused the explosion?
(1) overpressure (2) overheating (3) corrosion (4) crack and groove (5) congenital defects

7. Preventive measures for explosion accidents?
(1) to prevent overpressure (2) to prevent overheating (3) to prevent corrosion (4) to prevent crack and groove

8, soda co temp accident phenomenon?
(1) The water level in the water level gauge fluctuates violently and it is even impossible to see the water level clearly
(2) the temperature of superheated steam drops sharply
(3) water impact occurs in the steam pipe, and steam leakage occurs at the flange connection

9. What is "called water"?
(1) Open the water level gauge drain door and close the valve to flush the water pipe, and then slowly close the drain door. At this time, if the water level appears, it is a slight water shortage; if there is no water level, it is a serious water shortage
(2) above high pressure boiler should not be used to call water method, mainly rely on the instrument to judge, but also should have water level protection device to ensure safety.

10. There are several forms of pollution discharge?
(1) regular discharge (2) two kinds of continuous discharge

11. What is the function of pollution discharge?
Answer: discharge the scale and no slag in the boiler, reduce the salt content of furnace water. Excess water can be discharged when the boiler is full of water or when the boiler is stopped for cleaning.

12. What is the function of the safety valve?
Answer: when the boiler due to vaporization and other reasons caused by overpressure can play the role of pressure relief, alarm, to achieve the purpose of safe operation.

13. What is the function of the water level gauge?
A: water level represents a measurement instrument reflecting the level of the liquid, used to indicate the height of the water level in the boiler, can assist the staff to monitor the dynamic boiler water level, in order to control the normal range of the boiler water level.

14. What is the function of energy savers?
Answer: improve feed water temperature, reduce smoke loss, improve boiler thermal efficiency.

15. What causes the impact in the drum?
(1) the check valve on the water supply pipeline is not strict or the water level is lower than the water supply connection pipe to make the furnace water or steam flow back
(2) for a long time to stop the water into the boiler, even economizer to the drum of the pipe to form a steam bubble.

16, boiler water shock treatment method?
(1) Check the water level of the cylinder. If it is too low, it should be properly raised.
(2) the water into the drum should be balanced and stable, should not be interrupted water supply.

17. What causes the water shock in the steam pipeline?
(1) there is no good heating pipe or drainage before the steam supply.
(2) the valve is opened too fast or too large when supplying steam
(3) boiler load increase too fast or produce full water, soda and other accidents. It is steam that carries water into the pipe.

18. Treatment method of water shock in steam pipeline?
(1) Stop the gas supply and open the drain door on the steam pipeline for drainage. Then slowly open the steam supply valve to warm the pipe again, and keep enough time, and then formal steam supply after normal.
(2) check the water level in the drum, and take measures when it is too high.

19. What are the types of boiler accidents?
(1) explosion accident (2) major accident (3) general accident

20. Principle of HY?
Answer: the use of steam and condensed water both density difference, or change the physical properties of the phase state, to promote the valve to open and close to work.