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单选题
The clearance volume for a single stage compressor is defined as the space created between the （）.
A
top of the piston and bottom side of head, with the piston at BDC
B
piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDC
C
bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placement
D
top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
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更多 “单选题The clearance volume for a single stage compressor is defined as the space created between the （）.A top of the piston and bottom side of head, with the piston at BDCB piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCC bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placementD top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC” 相关考题
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maintain adequate coil back pressureB
prohibit flashing in the liquid lineC
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reduce compressor discharge line loading
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excessively late injection timing for each cylinderB
incorrectly adjusted intake valve timingC
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单选题Which of the following statements is true concerning the overall efficiency of air compressors?（）A
High pressure compressors are more efficient than low pressure compressorsB
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during the valve overlap periodB
with only the exhaust valve openC
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单选题The purpose of the refrigeration system low pressure cutout switch is to （）A
protect the compressor from liquid flood backB
protect the compressor from low discharge pressureC
start and stop the compressor upon system demandD
start the compressor after a drop in the evaporator pressure
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考题
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Perform online volume expansion.C
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Extend the system volume onto disk1. Create a single, stripe volume from disk2 and disk3. B
Extend the system volume onto disk2. Create a single, stripe volume from disk1 and disk2. C
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考题
单选题An air compressor can be unloaded at start-up by （）.A
holding the discharge valve openB
relieving the intercooler pressure to the atmosphereC
using an enlarged, permanently opened clearance expansion spaceD
a pre-charged accumulator
考题
单选题Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.A
positive displacementB
ejectorC
centrifugalD
air compressor
考题
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valve sizeC
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cylinder clearance volume
考题
单选题A vacuum is initially established in the first and second stages of a low pressure evaporator by the use of （）A
vacuum drag from the auxiliary condensate systemB
individual vacuum pumpsC
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单选题For a diesel engine, when the piston is at the （）, the clearance volume is the largest.A
TDCB
DTCC
BDCD
DBC
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