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The gas flow rate and the discharge pressure change as the shaft speed changes.
| a) | True | |
| b) | False |
Wrong
The correct answer is: True
The compressor performance curve is universal for all gases for a given shaft speed.
| a) | True | |
| b) | False |
The work done to compress the gas __________ as the flow rate of the gas increases.
| a) | Increases | |
| b) | Decreases | |
| c) | Does not change |
The compressor efficiency always increases as the gas flow increases.
| a) | True | |
| b) | False |
Wrong
The correct answer is: False
The surging of the compressor is more likely to occur when:
| a) | The gas flow rate through the compressor becomes extremely high | |
| b) | The gas temperature is very high | |
| c) | The gas flow rate through the compressor becomes very low | |
| d) | The inlet gas pressure is very high |
Wrong
The correct answer is: The gas flow rate through the compressor becomes very low
If the discharge valve is closed partially, the discharge pressure of the compressor:
| a) | Increases | |
| b) | Decreases | |
| c) | Does not change |
Wrong
The correct answer is: Increases
The anti-surge scheme which utilizes bypass flow to maintain sufficient flow through the compressor is called:
| a) | The bypass flow control | |
| b) | The spill back control | |
| c) | The spill forward control | |
| d) | None of the above |
Wrong
The correct answer is: The spill back control
In the spill back control, it is essential to provide a gas cooler because:
| a) | The gas temperature increases significantly during surging | |
| b) | The gas pressure increases to a much higher value when a spill back control is applied | |
| c) | The suction gas temperature may continue to increase |
In a multistage compressor, it is common to provide a gas cooler between two consecutive stages.
| a) | True | |
| b) | False |
If a single stage compressor is used when the required pressure rise is very large, __________.
| a) | The temperature rise becomes too large | |
| b) | The compressor casing and impeller may be damaged | |
| c) | The force exerted on various parts of the compressor are large leading to shorter equipment life | |
| d) | All the above |
The lube oil system supplies oil to the seal oil system if the oil becomes contaminated by the gas.
| a) | True...........was your answer | |
| b) | False...........is the correct answer |
If the turbine governor oil pressure drops, which of the following may happen?
| a) | The turbine may trip. | |
| b) | To maintain the oil pressure, the spare lube oil pump may start............was your answer | |
| c) | All the above...........is the correct answer |
The backup seal oil pump starts automatically when:
| a) | Seal oil head tank level decreases...........is the correct answer | |
| b) | Steam flow to the lube oil reservoir is commenced | |
| c) | If the turbine speed decreases | |
| d) | All the above...........was your answer |
The seal oil filters are present upstream of the seal oil pumps to prevent particles in seal oil from damaging the seal oil pumps.
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| By John Schmid | | | Тюнинг Corvette C6 от ателье LOMA Performance |