A. Selection
1. Which one of them shows that the temperature in gasifier is low? (    )
a. poker bar can be inserted smoothly       b. temperature of gas at outlet is low
c. surface of coal in gasifier is dark (watch it through probing hole)
d. saturated temperature is high
2. Which one will cause the temperature too high in gasifier (    )
a. saturated temperature is too low      b. overloading，or long term running with overloading
c. lack of coal in gasifier serious, zone of coal is too short     
d. quality of coal’s changed, while the parameters haven’t been adjusted in time
3. Which phenomenon shows the gasifier’s running partially?
a. quality of gas becomes bad      b. the gasification efficiency of coal is low
c. temperature of gas at outlet is high
4. Which one can confuse the zones in gasifier? (    )
a. remove ash unstably      b. too much coal in gasifier 
c. load changes too much or too quickly      d. coal feeding is not even
5. The slag collector doesn’t move, the reason may be (    )
a. the electromotor rotates wrongly in direction     b. oil pump can not pump oil
c. pressure of system is not big enough      d. hydraulic oil is too little in oil tank
6. Pressure meter at gasifier bottom fluctuates range is big, the reason may be (    )
a. something wrong with the meter     b. there is some water in technic gasification pipe
c. something wrong with air blower
7. Coal can not be feed in the hearth of gasifier, the reason may be (    )
a. the gasifier is full      b. something (coal) hangs on coal lock
c. gas leaks from coal lock seriously     d. coal lock is blocked
8. The water level in vapor drum falls sharply, the reason may be (    )
a. something wrong with soft water pump     b. leakage of dirty water discharge system
c. leakage of water jacket     d. Exfoliation of water supply valve 
9. Pressure at gasifier outlet increases sharply, the reason may be (    )
a. water seal is blocked     b. water seal lacks of water
c. air is blasted too much     d. there’s no correct answers in a, b and c
10. How to handle the hot running of the gasifier? (    )
a. increase the saturated temperature      b. reduce the load appropriately
c. poke the ash fully     d. reset the parameter according to the quality of coal
11. The correct operation when the gasifier is at banking state (    )
a. open the probing hole to check the running condition
b. blow air when the temperature lower down       
c. feed coal and remove ash arbitrarily     d. keep the gasifier under the condition of ventilation
12. After probing hole, which color of poker bar shows the gasifier runs normally? (    )
a. light red     b. light red-dark red     c. cherry red     d. white
13. Slag collector doesn’t move, how to deal with it? (    )
a. shift the motor’s rotating direction     b. check the oil pump
c. check or adjust the overflow valve     d. add some hydraulic oil
14. After probing hole, the poker bar shows dark red, how to deal with it? (    )
a. increase the saturated temperature      b. reduce the saturated temperature appropriately