Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.A.carbon deposits on the compressor suction valvesB.the evaporator temperature to increaseC.rapid corrosion of the thermal expansion valveD.no ope

题目

Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.

A.carbon deposits on the compressor suction valves

B.the evaporator temperature to increase

C.rapid corrosion of the thermal expansion valve

D.no operating problems

相似考题

1.Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?( )A.Shortage of refrigerant oilB.Slight shortage of refrigerantC.Excessive condenser cooling water flowD.Faulty expansion valve

2.Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur when the compressorA.has run continuously for a long periodB.suction pressure is below normalC.oil level is below normalD.starts after a long idle period

3.Low compressor head pressure in a refrigeration system can be caused by ___.A.insufficient condenser cooling waterB.excessive condenser cooling waterC.air in the refrigeration systemD.excessive refrigerant in the system

4.Moisture is removed from a refrigeration system byA.bleeding refrigerant from the condenserB.opening a drain petcock on the oil separatorC.condensing the water in the heat exchangerD.using a dehydrator cartridge

参考答案和解析
正确答案：B
更多“Excessive circulation of the lubricating oil with the refrigerant in a refrigeration syste ”相关问题

  • 第1题：

    Sweating of the refrigeration system compressor crankcase is caused by_______ .

    A.too much superheat

    B.insufficient superheat

    C.suction pressure too low

    D.excessive refrigerant returning to the compressor


    正确答案：D

  • 第2题：

    Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.

    A.refrigerant bubbles in the lube oil

    B.refrigerant reducing the lube oil viscosity

    C.oxidation(氧化) of the lube oil from overheating

    D.reducing the floc or cloud point of the oil


    正确答案：C

  • 第3题：

    单选题
    A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.
    A

    a shortage of refrigerant in the system

    B

    air in the system

    C

    an accumulation of liquid refrigerant in the crankcase

    D

    a shortage of oil in the crankcase


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    The primary purpose of oil control rings on a diesel piston is to（）
    A

    provide a reservoir for cylinder lubrication

    B

    pump oil into the combustion space for cylinder cooling

    C

    prevent excessive lubricating oil consumption

    D

    allow hydraulic oil film formation on the cylinder


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.
    A

    overheated compressor bearings

    B

    excess lube oil viscosity

    C

    carbon deposits on the compressor piston rings

    D

    wax crystals forming in the lubricant


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    Moisture is removed from a refrigeration system by（）.
    A

    bleeding refrigerant from the condenser

    B

    opening a drain petcock on the oil separator

    C

    condensing the water in the heat exchanger

    D

    using a dehydrator cartridge


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    Before charging a refrigeration unit, the refrigerant charging lines should be（）
    A

    flushed with clean refrigerant oil

    B

    purged with the refrigerant

    C

    washed with an ammonia and alcohol solution

    D

    grounded to compressor


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    Foaming of the oil in a refrigeration compressor crankcase is caused by （）.
    A

    refrigerant boiling out of solution from the lube oil

    B

    liquid refrigerant flooding the compressor and system

    C

    lube oil viscosity being reduced by refrigerant dilution

    D

    compressor suction pressure suddenly increasing


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
    A

    oil foaming in the compressor

    B

    higher than normal suction and discharge pressures with a higher box temperature

    C

    higher than normal discharge pressure with a normal box temperature

    D

    the compressor to run continuously


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.
    A

    compressor damage from improper lubrication

    B

    refrigerant absorption by the lubricant

    C

    increased viscosity in the lubricant

    D

    carbon deposit on the compressor suction valves


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）
    A

    Splash

    B

    Gravity

    C

    Pressure

    D

    Bypass


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.
    A

    carbon deposits on the compressor suction valves

    B

    the evaporator temperature to increase

    C

    rapid corrosion of the thermal expansion valve

    D

    no operating problems


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?

    A.A shortage of liquid refrigerant.

    B.Excessive frost on the evaporator.

    C.Excessive condenser cooling water.

    D.Insufficient condenser cooling water flow.


    正确答案：D

  • 第14题：

    单选题
    The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.
    A

    sudden evaporation of wax crystals in the lubricant

    B

    sudden evaporation of entrapped air in the lubricant

    C

    release of refrigerant from the oil/refrigerant mixture

    D

    release of dissolved lubricant from the refrigerant


    正确答案： B
    解析： 暂无解析

  • 第15题：

    单选题
    Refrigeration system compressor crankcase sweating is an indication of （）.
    A

    insufficient lube oil circulating through the system

    B

    excessive circulation of lube oil through the system

    C

    insufficient refrigerant in the system

    D

    an overworked compressor


    正确答案： D
    解析： 暂无解析

  • 第16题：

    单选题
    An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）
    A

    have a high viscosity index

    B

    mix readily with refrigerant

    C

    have a high freezing point

    D

    have a low pour point


    正确答案： A
    解析： 暂无解析

  • 第17题：

    单选题
    Excessive lubricating oil consumption in a running diesel engine can be caused by （）
    A

    clogged lube oil piping

    B

    excessive valve-guide clearance

    C

    high lube oil viscosity

    D

    low lube oil temperature


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    If a refrigeration compressor will not start, the reason may be （）.
    A

    the pressure regulating valve is not closing

    B

    an excessive lack of refrigerant in the system

    C

    badly leaking discharge valves

    D

    worn piston rings


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
    A

    the relief valve should open before the high pressure cutout

    B

    the relief valve should open and allow the excess refrigerant to flow to the receiver

    C

    the high pressure cutout switch should operate before the relief valve opens

    D

    you should close in on the suction valve


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    Refrigerant is circulated through a refrigeration system by the （）.
    A

    compressor

    B

    condenser

    C

    expansion valve

    D

    evaporator


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    Saltwater is typically provided to a refrigeration system to （）.
    A

    cool the expansion valve

    B

    prevent refrigerant superheating

    C

    condense the refrigerant gas

    D

    prevent motor overheating


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
    A

    purge lube oil from the liquid refrigerant

    B

    recover water purged from the system

    C

    separate foul gases from the receiver

    D

    purge non-condensable gases without losing refrigerant


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur（） when the compressor.
    A

    has continuously for a long period

    B

    suction pressure is below normal

    C

    oil level is below normal

    D

    starts after a long idle period


    正确答案： C
    解析： 暂无解析

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