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salvatorefricano
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compression ratio in absolute pressure (psiga)
- absolute discharge / by absolute suction = compression ratio
- absolute = psiga 14.7
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Which of the following terminal combinations would show an open circuit if the internal overload device in a hermetic compressor should open due to excessive heat.
- common to run 1 to 2
- common to start 1 to 3
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The clearance volume of a compressor cylinder is the
volume of the space between the bottom of the valve plate and the top of the piston at top dead center
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The pulley on the motor is called the
drive pulley
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The pulley on compressor is called the
driven pulley
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If the compression ratio of a system with a reciprocating compressor increases, the amount of refrigerant pumped by the compressor
will decrease
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If the compression ratio of a system with a reciprocating compressor decreases, the amount of refrigerant pumped by the compressor
will increase
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On a direct drive compressor the ________ is used to connect the compressor shaft and motor shaft together
flexible coupling
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Over heated oil may turn to carbon and create ______ in the system
acid
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rotary compressors are used primarily in ______.
domestic refrigerators
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The discus valve design is more efficient than a flapper valve design because ________.
it allows a compressor designed with less clearance volume
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flapper and read valves are use in the ______ compressor
reciprocating
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What could happen if a semi-hermetic compressor is operated with the suction service valve back seated and the discharge front seated
the head of the compressor may blow off
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The shaft seal on open drive compressor _______.
keeps the refrigerant vapor in and atmosphere out of the compressor
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Liquid entering the compression chamber of the reciprocating compressor can lead to ________
- damaged piston rings
- damaged valves
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Connecting rods connect to _______
- crankshaft to the piston
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On a direct drive compressor the _______ is used to insure proper aliment in a flexible coupling
- dial indicator
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The ______ valves in a reciprocating compressor opens and closes depending on the difference in pressure across them
- suction and discharge
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The screw type compressor is used primarily in ________.
large industrial refrigeration and aircondishing systems
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Because a scroll compressor has fewer moving parts, it operates much quieter then other compressor designs and technologies
true /false
true
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The semi hermetic is one type of reciprocating compressor
true / false
true
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The scroll compressor is one type of reciprocating compressor
true /false
false
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Scroll compressors are becoming popular because they can handle some liquid flood back with out compressor damage
true / false
true
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We use two stage compression on a system that would have a compression ratio that exceeds 8.5 : 1 ratio
true / false
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A bolted together motor compressor assembly are referred to as a hermetic type
true/ false
- false
- semi-hermetic
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On a belt drive compressor the driven pulley is attached to the compressor
true /false
true
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