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In the degassing tank, nitrogen is normally used as the blowing gas.
Wrong
The correct answer is: The oil absorbs the heat generated by the bearings of the compressor and turbine and hence needs to be cooled.
Excessive cooling of lube oil:
| a) | Does not have any effect on the oil viscosity | |
| b) | Increases the oil viscosity | |
| c) | Decreases the oil viscosity |
Wrong
The correct answer is: Increases the oil viscosity
When the oil filter is clogged, it leads to __________.
| a) | A high differential pressure across the filter | |
| b) | A high differential temperature across the filter | |
| c) | A low differential pressure across the filter | |
| d) | A higher pressure at the outlet of the filter |
When the oil filter is clogged, __________.
| a) | Shutdown the lube and the seal oil system | |
| b) | Bypass the oil filter and clean the oil filter | |
| c) | Place the backup filter in operation and clean the clogged filter | |
| d) | Stop the lube oil circulation to the compressor and the turbine bearings. Continue the seal oil circulation |
Wrong
The correct answer is: Place the backup filter in operation and clean the clogged filter
The pressure of lube oil leaving the filter is controlled before it enters the compressor bearings.
| a) | True | |
| b) | False |
The lube oil flow from the bearings can be checked using:
| a) | Sight glass | |
| b) | Lube oil pump discharge pressure | |
| c) | Level in the lube oil tank | |
| d) | All the above |
Seal oil is supplied to the turbine governor.
| a) | True | |
| b) | False |
Wrong
The correct answer is: False
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. | |
| c) | All the above |
Wrong
The correct answer is: All the above
If the lube oil main pump stops and the backup pump fails to start, the turbine is tripped automatically. The oil supply to the turbine and the compressor then stops. How is the lubrication achieved?
| a) | Lubrication is not required since the compressor and the turbine will soon stop completely. | |
| b) | By emergency manual injection of the lube oil. | |
| c) | The oil in the lube oil head tank supplies the lube oil. | |
| d) | By cooling the bearings with cool air. |
During normal operation, the lube oil overflows from the head tank and returns to the __________.
| a) | Compressor bearings | |
| b) | Turbine bearings | |
| c) | Lube oil reservoir | |
| d) | Seal oil tank |
Wrong
The correct answer is: Lube oil reservoir
The seal oil pumps supply seal oil to the compressor shaft seal.
| a) | True | |
| b) | False |
The backup seal oil pump starts automatically when:
| a) | Seal oil head tank level decreases | |
| b) | Steam flow to the lube oil reservoir is commenced | |
| c) | If the turbine speed decreases | |
| d) | All the above |
Wrong
The correct answer is: Seal oil head tank level decreases
The seal oil forms a __________ film around the seal in the shaft.
| a) | Thin | |
| b) | Thick |
The seal oil filters are present upstream of the seal oil pumps to prevent particles in seal oil from damaging the seal oil pumps.
| a) | True | |
| b) | False |
Wrong
The correct answer is: False
The seal oil head tank is located at an elevation higher than the compressor. This is:
| a) | To ease the flow of the seal oil to the compressor seal | |
| b) | To maintain the pressure difference between the seal oil and the gas | |
| c) | To make more ground space available for the other equipment | |
| d) | To make the elevation of the seal oil head tank equal to that of the lube oil head tank |
The seal oil returning to the oil reservoir may contain some gas trapped in it. This trapped gas is usually eliminated in:
| a) | The degassing tank | |
| b) | The oil filter | |
| c) | The seal oil head tank |
Wrong
The correct answer is: The degassing tank
In the degassing tank, nitrogen is normally used as the blowing gas.
| a) | True | |
| b) | False |
Date: 2016-01-14; view: 845
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