Questão 1
Questão
_______ on centrifugal air compressors are provided in order to control the amount of air flowing to the impeller and thus control the capacity of the unit.
Questão 2
Questão
The aftercooler is used in an air compression system to cool the:
Responda
-
Air after the first stage of compression
-
Lubricating oil of large axial compressors
-
Air after it leaves the receiver
-
Air after the last stage of compression
-
Air before being compressed
Questão 3
Questão
The aftercooler is used in an air compression system to cool the:
Responda
-
Air after the first stage of compression
-
Lubricating oil of large axial compressors
-
Air after it leaves the receiver
-
Air after the last stage of compression
-
Air before being compressed
Questão 4
Questão
Positive displacement compressor types include:
1. Sliding vane
2. Axial flow
3. Internal gear
4. Volute casing
5. Rotary screw
6. Multi lobe
Responda
-
1,3,4,6
-
2,4,5,6
-
1,3,5,6
-
1,2,4,5
-
2,3,5,6
Questão 5
Questão
Effective intercooling will reduce weakening of parts due to high temperatures, and reduce possibility of:
Responda
-
Compressor explosions
-
Water hammer
-
Compressor implosions
-
Compressor leaks
-
Corrosion
Questão 6
Questão
In the variable speed control method the compressor output is regulated by:
Questão 7
Questão
A method of unloading a reciprocating compressor is to:
Responda
-
Hold the discharge valve closed
-
Hold the discharge valve open
-
Place a check valve in the discharge line
-
Hold the inlet valves in the open position
-
Unloading a cylinder
Questão 8
Questão
The flow of air from a compressor must be _______ to suit the load requirements and to maintain constant pressure in the system.
Responda
-
Increased
-
Decreased
-
Dampened
-
Interrupted
-
Regulated
Questão 9
Questão
To prevent surging, the load on the compressor must not be allowed to fall below the:
Responda
-
Surge limit
-
Maximum volume
-
Related point
-
Rated pressure
-
Set point
Questão 10
Questão
The ________ control method can be used when a compressor is driven by a steam engine, a turbine, or an internal combustion engine.