Pregunta 1
Pregunta
The absolute discharge pressure compared to the absolute intake pressure is referred to as
Respuesta
-
guage pressure
-
compression ratio
-
isentropic exponent
-
isothermal compression
-
absolute pressure
Pregunta 2
Pregunta
Air at normal atmospheric conditions located at the compressor inlet is termed
Respuesta
-
free air
-
interstage air
-
compression air
-
ambient air
-
unloaded air
Pregunta 3
Pregunta
The volumetric efficiency of an air compressor is the ratio of
Respuesta
-
1st stage cylinder volume to 2nd stage cylinder volume
-
inlet air temperature compared to discharge air temperature
-
capacity to displaced volume
-
isothermal compression compared to adiabatic compression
-
cylinder volume compared to air receiver volume
Pregunta 4
Pregunta
An air compression curve on a pressure-volume diaphragm will be:
Pregunta 5
Pregunta
The clearance volume on an air compressor
Respuesta
-
has no effect on discharge capacity
-
has a direct effect on compressor capacity
-
varies with the speed of the compressor
-
must be large enough to prevent the cylinder overheating
-
is important in the event that there is moisture in the air being compressed
Pregunta 6
Pregunta
An air compressor at a significantly higher altitude compared to an air compressor at a lower altitude will deliver:
Respuesta
-
less volume of air
-
higher volume of air
-
less mass of air
-
more mass of air
-
an equal mass of air
Pregunta 7
Pregunta
The effect of moisture in a compressed air system is detrimental because:
Respuesta
-
it will lower the discharge air temperature
-
it will cause corrosion in the air piping
-
it will freeze in the winter
-
it will plug the actuators
-
it requires more power to compress the air
Pregunta 8
Pregunta
The term dewpoint is defined as
Respuesta
-
saturation pressure of the air
-
the temperature of the air when it begins to absorb moisture
-
relative humidity
-
the temperature of the air when water vapour begins to condense
-
none of the above
Pregunta 9
Pregunta
Air compressors may be classified as either:
Respuesta
-
positive displacement and dynamic
-
single acting and double acting
-
single stage and multi stage
-
positive displacement and negative displacement
-
centrifugal and reciprocating
Pregunta 10
Pregunta
which type of air compressor is best suited for high pressure, moderate volume applications
Respuesta
-
reciprocating
-
centrifugal
-
rotary
-
dynamic
-
axial
Pregunta 11
Pregunta
A reciprocating air compressor compared to a rotary air compressor is:
Pregunta 12
Pregunta
which of the following is a positive displacement compressor:
Respuesta
-
axial
-
centrifugal
-
turbine
-
reciprocating
-
none of the above
Pregunta 13
Pregunta
A reciprocating compressor has the ability to deliver oil-free air if:
Respuesta
-
no oil is used to lubricate the cylinder
-
the piston uses Teflon rings
-
if the exhaust air is filtered prior to entering the air reciever
-
not possible to deliver oil free air
-
synthetic oil is used instead of conventional oil
Pregunta 14
Pregunta
A reciprocating air compressor is suitable for:
Pregunta 15
Pregunta
The piston on an air compressor may be made of
Respuesta
-
alloy steel
-
cast iron
-
steel
-
aluminum
-
all of the above
Pregunta 16
Pregunta
A double-acting reciprocating compressor:
Respuesta
-
has more than one stage
-
may compress more than one fluid at a time
-
must utilize an intercooler
-
receives and discharges air at both ends of the cylinder
-
is of a dynamic axial design