What is the most probable cause of reduced capacity in a reciprocating air compressor ________．A.Carbon on cylinder headsB.Faulty unloaderC.Leaking air valvesD.Plugged air cooler

题目

What is the most probable cause of reduced capacity in a reciprocating air compressor ________．

A.Carbon on cylinder heads

B.Faulty unloader

C.Leaking air valves

D.Plugged air cooler

相似考题

1.what is the use of “unloader “on main air compressor ?

2.If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably _____.A.misalignment or worn main bearingsB.insufficient cylinder lubricationC.defective or poorly fitted valvesD.All of the above

3.In a chilled(冷的) water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by ______.A.increasing refrigerant pressure in the coilB.increasing chilled water flow through the coolerC.sub-cooling the refrigerant in the condenserD.superheating the refrigerant in the compressor

4.Web users are reporting issues downloading various types of media. Which of the following shouldthe administrator do FIRST?()A. Find out what has recently changed on the networkB. Create an action plan and solution identifying potential effects.C. Continue to gather information and see what other problems may exist.D. Determine the most probable cause.

更多“What is the most probable cause of reduced capacity in a reciprocating air compressor ____ ”相关问题

  • 第1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2题：

    The nfsstat -c command shows zero badxid， but retrans and timeouts are sizeable， what is the most probable cause of the problem？（）

    • A、 Too many nfsd’s running
    • B、 Client and server with different buffer sizes
    • C、 Bridges， routers or gateways are receiving too many fragmentated packets
    • D、 Too few nfsd’s running

    正确答案:B

  • 第3题：

    单选题
    Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.
    A

    the cooling effect of the condensate reduces the compressors efficiency

    B

    a danger of explosion exists whenever water is present in a compressor

    C

    water causes erratic operation of pneumatic components

    D

    the volumetric capacity of the first stage is reduced if water remains


    正确答案： A
    解析： 暂无解析

  • 第4题：

    单选题
    If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.
    A

    system was overcharged with refrigerant

    B

    high pressure switch was improperly adjusted

    C

    expansion valve strainers were fouled

    D

    suction valves were leaking slightly


    正确答案： B
    解析： 暂无解析

  • 第5题：

    单选题
    Web users are reporting issues downloading various types of media. Which of the following shouldthe administrator do FIRST?（）
    A

    Find out what has recently changed on the network

    B

    Create an action plan and solution identifying potential effects.

    C

    Continue to gather information and see what other problems may exist.

    D

    Determine the most probable cause.


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    If the electric motor driving an air compressor fails to start, the cause may be a （）.
    A

    leaking unloader

    B

    tripped circuit breaker

    C

    control line leak

    D

    defective pop valve


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
    A

    increasing refrigerant pressure in the coil

    B

    increasing chilled water flow through the cooler

    C

    sub-cooling the refrigerant in the condenser

    D

    superheating the refrigerant in the compressor


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    The nfsstat -c command shows zero badxid， but retrans and timeouts are sizeable， what is the most probable cause of the problem？（）
    A

     Too many nfsd’s running

    B

     Client and server with different buffer sizes

    C

     Bridges， routers or gateways are receiving too many fragmentated packets

    D

     Too few nfsd’s running


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.
    A

    misalignment or worn main bearings

    B

    insufficient cylinder lubrication

    C

    defective or poorly fitted valves

    D

    all of the above


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    One of the mirrored disks for the root volume group has failed. Although the logical volumes are mirrored, and the bosboot command was run, the machine will not boot. What is the most probable cause?（）
    A

    Quorum was not turned off

    B

    Paging space was not mirrored

    C

    The dump space was not mirrored

    D

    The surviving disk was too small


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.
    A

    leaky discharge valves on the LP cylinder

    B

    leaky discharge valves on the HP cylinder

    C

    insufficient intercooler cooling

    D

    low ambient air pressure


    正确答案： C
    解析： 暂无解析

  • 第12题：

    填空题
    What was the probable cause of the fire?Most likely a burning ____.

    正确答案： cigarette
    解析：
    因果关系题。由听力原文中“When we asked the fire chief how the fire started, he answered that most likely a burning cigarette caused it”可以推断，救火队长认为火灾是由点燃的香烟引起的，所以填cigarette。
    【录音原文】
    　　Now back to the news. An early morning fire damaged the historic Geller House today. It destroyed the third floor of the building, but the firefighters saved the first and second floors. There were only a few elderly people living in the building at that time. And they were carried out to safety.
    　　The Geller House was built in 1718 and it was used as a hotel for over 150 years. George Washington stayed there in 1782. Five years ago, it was made into a building for the elderly.
    　　Several fire departments were called to the scene. When we asked the fire chief how the fire started, he answered that most likely a burning cigarette caused it. He promised to make a further investigation into the cause.
    Q11: At what time of day did the fire start?
    Q12: Which floor of the building did the fire destroy?
    Q13: Who lived in the building at the time of the fire?
    Q14: When was the Geller House built?
    Q15: What was the probable cause of the fire?

  • 第13题：

    One of the mirrored disks for the root volume group has failed. Although the logical volumes are mirrored, and the bosboot command was run, the machine will not boot. What is the most probable cause?（）

    • A、Quorum was not turned off
    • B、Paging space was not mirrored
    • C、The dump space was not mirrored
    • D、The surviving disk was too small

    正确答案:A

  • 第14题：

    单选题
    Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.
    A

    using a slightly dirty air filter

    B

    using oil having an excessive viscosity

    C

    intercooler or after-cooler leaks

    D

    carrying the oil level higher than normal


    正确答案： B
    解析： 暂无解析

  • 第15题：

    单选题
    In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）
    A

    broken valve springs

    B

    tight drive belts

    C

    high line voltage

    D

    air in the system


    正确答案： A
    解析： 暂无解析

  • 第16题：

    填空题
    What is the probable cause if the fan seems to be running slower than usual?The oven has been put in a ____.

    正确答案： cold area
    解析：
    定位到表格第二行第二列“The oven has been stored in a cold area”。

  • 第17题：

    单选题
    Broken valve strips in an operating low pressure, air compressor will cause （）.
    A

    an immediate crankcase explosion

    B

    oil contamination in the compressed air

    C

    a decrease in compressor capacity

    D

    no immediate loss of the compressed air capacity


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）
    A

    The density of the air entering the compressor

    B

    The temperature of the air entering the compressor

    C

    The designed rotating speed of the compressor

    D

    A leaking head gasket


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）
    A

    Excessive compression in the cylinder

    B

    A broken intake valve

    C

    A dirty inlet filter element

    D

    An improperly adjusted discharge valve


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.
    A

    compressor is overloaded

    B

    motor is overloaded

    C

    foundation bolts are loose

    D

    belts are too tight


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.
    A

    wax precipitation in the lube oil

    B

    contamination by dust, scale, or moisture

    C

    refrigerant bubbles in the lube oil

    D

    refrigerant reducing the lube oil viscosity


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    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 of the lube oil from overheating

    D

    reducing the floc or cloud point of the oil


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）
    A

    Carbon build up in the piston ring belt

    B

    Faulty operation of a cylinder un-loader

    C

    Compressor operation in an area of high relative humidity

    D

    Lifting of intercooler rebel valve


    正确答案： D
    解析： 暂无解析

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