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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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单选题Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.A
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maintain adequate coil back pressureB
prohibit flashing in the liquid lineC
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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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考题
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
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单选题Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.A
during the valve overlap periodB
with only the exhaust valve openC
at a pressure below atmosphericD
without cooling the cylinders or pistons
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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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bypass the high pressure stage to the low pressure stage on 100% of the air compressors in serviceB
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Reestablish the mirror array.B
Perform online volume expansion.C
Insert hot plug drive.D
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单选题You have just added three new hard disks to your Windows 2000 Professional computer. You want to configure all of the disks as two drives. You want the two drives to be as equal in size as possible. You want to configure the non-system drive for the best optimal performance. What should you do?（）A
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
Extend the system volume onto disk1. Create a single, spanned volume from disk2 and disk3. D
Extend the system volume onto disk1. Create a single, spanned volume from disk1 and disk2. E
Create a single, stripe volume from disk1, disk2, and disk3.F
Create a single spanned volume from disk1, disk2, and disk3.
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
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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
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compression ratioB
valve sizeC
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cylinder clearance volume
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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
a single non-condensing air ejectorD
a two stage air ejector
考题
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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