Test
power prep quiz 13
Preguntas del test (16)
1The absolute discharge pressure compared to the absolute intake pressure is referred to as
- Aguage pressure
- Bcompression ratio
- Cisentropic exponent
- Disothermal compression
- Eabsolute pressure
2Air at normal atmospheric conditions located at the compressor inlet is termed
- Afree air
- Binterstage air
- Ccompression air
- Dambient air
- Eunloaded air
3The volumetric efficiency of an air compressor is the ratio of
- A1st stage cylinder volume to 2nd stage cylinder volume
- Binlet air temperature compared to discharge air temperature
- Ccapacity to displaced volume
- Disothermal compression compared to adiabatic compression
- Ecylinder volume compared to air receiver volume
4An air compression curve on a pressure-volume diaphragm will be:
- Apure polytropic
- Bpurely isentropic
- Cpurely isothermal
- Dsomewhere between constant pressure and constant volume
- Esomewhere between adiabatic and isothermal
5The clearance volume on an air compressor
- Ahas no effect on discharge capacity
- Bhas a direct effect on compressor capacity
- Cvaries with the speed of the compressor
- Dmust be large enough to prevent the cylinder overheating
- Eis important in the event that there is moisture in the air being compressed
6An air compressor at a significantly higher altitude compared to an air compressor at a lower altitude will deliver:
- Aless volume of air
- Bhigher volume of air
- Cless mass of air
- Dmore mass of air
- Ean equal mass of air
7The effect of moisture in a compressed air system is detrimental because:
- Ait will lower the discharge air temperature
- Bit will cause corrosion in the air piping
- Cit will freeze in the winter
- Dit will plug the actuators
- Eit requires more power to compress the air
8The term dewpoint is defined as
- Asaturation pressure of the air
- Bthe temperature of the air when it begins to absorb moisture
- Crelative humidity
- Dthe temperature of the air when water vapour begins to condense
- Enone of the above
9Air compressors may be classified as either:
- Apositive displacement and dynamic
- Bsingle acting and double acting
- Csingle stage and multi stage
- Dpositive displacement and negative displacement
- Ecentrifugal and reciprocating
10which type of air compressor is best suited for high pressure, moderate volume applications
- Areciprocating
- Bcentrifugal
- Crotary
- Ddynamic
- Eaxial
11A reciprocating air compressor compared to a rotary air compressor is:
- Amore efficient
- Bless efficient
- Cequally efficient
- Deasier to operate
- Erequires less lubrication
12which of the following is a positive displacement compressor:
- Aaxial
- Bcentrifugal
- Cturbine
- Dreciprocating
- Enone of the above
13A reciprocating compressor has the ability to deliver oil-free air if:
- Ano oil is used to lubricate the cylinder
- Bthe piston uses Teflon rings
- Cif the exhaust air is filtered prior to entering the air reciever
- Dnot possible to deliver oil free air
- Esynthetic oil is used instead of conventional oil
14A reciprocating air compressor is suitable for:
- Apulsation free air
- Blow pressure applications
- Call pressure ranges
- Ddelivering moisture free air
- Eall of the above
15The piston on an air compressor may be made of
- Aalloy steel
- Bcast iron
- Csteel
- Daluminum
- Eall of the above
16A double-acting reciprocating compressor:
- Ahas more than one stage
- Bmay compress more than one fluid at a time
- Cmust utilize an intercooler
- Dreceives and discharges air at both ends of the cylinder
- Eis of a dynamic axial design
Información
- Descripción
- power engineering 3b2 Test sobre power prep quiz 13, creado por TRAVIS CANNING el 28/02/2016.
- Autor
- TRAVIS CANNING
- Idioma
- English
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