TRAVIS CANNING
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power engineering 3b2 Quiz on power prep quiz 13, created by TRAVIS CANNING on 28/02/2016.

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TRAVIS CANNING
Created by TRAVIS CANNING about 8 years ago
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power prep quiz 13

Question 1 of 16

1

The absolute discharge pressure compared to the absolute intake pressure is referred to as

Select one of the following:

  • guage pressure

  • compression ratio

  • isentropic exponent

  • isothermal compression

  • absolute pressure

Explanation

Question 2 of 16

1

Air at normal atmospheric conditions located at the compressor inlet is termed

Select one of the following:

  • free air

  • interstage air

  • compression air

  • ambient air

  • unloaded air

Explanation

Question 3 of 16

1

The volumetric efficiency of an air compressor is the ratio of

Select one of the following:

  • 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

Explanation

Question 4 of 16

1

An air compression curve on a pressure-volume diaphragm will be:

Select one of the following:

  • pure polytropic

  • purely isentropic

  • purely isothermal

  • somewhere between constant pressure and constant volume

  • somewhere between adiabatic and isothermal

Explanation

Question 5 of 16

1

The clearance volume on an air compressor

Select one of the following:

  • 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

Explanation

Question 6 of 16

1

An air compressor at a significantly higher altitude compared to an air compressor at a lower altitude will deliver:

Select one of the following:

  • less volume of air

  • higher volume of air

  • less mass of air

  • more mass of air

  • an equal mass of air

Explanation

Question 7 of 16

1

The effect of moisture in a compressed air system is detrimental because:

Select one of the following:

  • 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

Explanation

Question 8 of 16

1

The term dewpoint is defined as

Select one of the following:

  • 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

Explanation

Question 9 of 16

1

Air compressors may be classified as either:

Select one of the following:

  • positive displacement and dynamic

  • single acting and double acting

  • single stage and multi stage

  • positive displacement and negative displacement

  • centrifugal and reciprocating

Explanation

Question 10 of 16

1

which type of air compressor is best suited for high pressure, moderate volume applications

Select one of the following:

  • reciprocating

  • centrifugal

  • rotary

  • dynamic

  • axial

Explanation

Question 11 of 16

1

A reciprocating air compressor compared to a rotary air compressor is:

Select one of the following:

  • more efficient

  • less efficient

  • equally efficient

  • easier to operate

  • requires less lubrication

Explanation

Question 12 of 16

1

which of the following is a positive displacement compressor:

Select one of the following:

  • axial

  • centrifugal

  • turbine

  • reciprocating

  • none of the above

Explanation

Question 13 of 16

1

A reciprocating compressor has the ability to deliver oil-free air if:

Select one of the following:

  • 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

Explanation

Question 14 of 16

1

A reciprocating air compressor is suitable for:

Select one of the following:

  • pulsation free air

  • low pressure applications

  • all pressure ranges

  • delivering moisture free air

  • all of the above

Explanation

Question 15 of 16

1

The piston on an air compressor may be made of

Select one of the following:

  • alloy steel

  • cast iron

  • steel

  • aluminum

  • all of the above

Explanation

Question 16 of 16

1

A double-acting reciprocating compressor:

Select one of the following:

  • 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

Explanation

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