Power Engineering 3B2 ch 9 (Compressor Auxiliaries &
Operation) Questions With Complete Solutions
A method of unloading a reciprocating compressor is to
________________________.
a. hold the discharge valve closed
b. hold the discharge valve open
c. place a check valve in the discharge line
d. hold the inlet valves in the open position
e. unloading a cylinder
D
The item used to activate the inlet air unloader is
________________.
a. a spring loaded pilot valve
b. a torsion bar
c. a bleed-off valve
d. a compressor flywheel
e. None of the above
A
The flow of air from a compressor must be _______ to suit load
requirements and to maintain constant pressure in the system.
a. increased
b. decreased
,c. dampened
d. interrupted
e. regulated
E
The ________ control method can be used when the compressor
is driven by a steam engine, a turbine, or an internal combustion
engine.
a. constant speed
b. start and stop
c. dual
d. start and stop in conjunction with constant speed
e. variable speed
E
Output from a compressor using the constant speed control
method must use some type of ______________ device.
a. unloading
b. uploading
c. down loading
d. start stop device
e. variable speed
A
To prevent surging, the capacity of the compressor must not be
allowed to fall below the ___________.
, a. surge limit
b. maximum volume
c. rated point
d. rated pressure
e. set point
A
One method to prevent surging in dynamic compressors is to
___________________.
a. sue variable frequency drive
b. use vanes
c. install a recirculation line
d. open a discharge line blow-off valve to atmosphere
e. use a safety valve
D
The reasons for cooling the air in an air compression system is
to:
1) Remove water vapor and oil vapor from the air
2) Make cylinder lubrication more effective.
3) Decrease the amount of power required to compress the air.
4) Remove fixed carbon from the value s.
a. 2, 4
b. 1, 4
c. 1, 2, 3
d. 1, 2, 3, 4
e. None of the above
Operation) Questions With Complete Solutions
A method of unloading a reciprocating compressor is to
________________________.
a. hold the discharge valve closed
b. hold the discharge valve open
c. place a check valve in the discharge line
d. hold the inlet valves in the open position
e. unloading a cylinder
D
The item used to activate the inlet air unloader is
________________.
a. a spring loaded pilot valve
b. a torsion bar
c. a bleed-off valve
d. a compressor flywheel
e. None of the above
A
The flow of air from a compressor must be _______ to suit load
requirements and to maintain constant pressure in the system.
a. increased
b. decreased
,c. dampened
d. interrupted
e. regulated
E
The ________ control method can be used when the compressor
is driven by a steam engine, a turbine, or an internal combustion
engine.
a. constant speed
b. start and stop
c. dual
d. start and stop in conjunction with constant speed
e. variable speed
E
Output from a compressor using the constant speed control
method must use some type of ______________ device.
a. unloading
b. uploading
c. down loading
d. start stop device
e. variable speed
A
To prevent surging, the capacity of the compressor must not be
allowed to fall below the ___________.
, a. surge limit
b. maximum volume
c. rated point
d. rated pressure
e. set point
A
One method to prevent surging in dynamic compressors is to
___________________.
a. sue variable frequency drive
b. use vanes
c. install a recirculation line
d. open a discharge line blow-off valve to atmosphere
e. use a safety valve
D
The reasons for cooling the air in an air compression system is
to:
1) Remove water vapor and oil vapor from the air
2) Make cylinder lubrication more effective.
3) Decrease the amount of power required to compress the air.
4) Remove fixed carbon from the value s.
a. 2, 4
b. 1, 4
c. 1, 2, 3
d. 1, 2, 3, 4
e. None of the above
