clearance，C

相似题目

• If the back clearance of a piston ring is excessive,（）

  A . compression pressure in the cylinder will be higher B . carbon will accumulate behind the ring C . combustion gases will penetrate beneath the ring land D . piston side thrust will be increased

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• 预检（Pre-clearance）

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• Valve lash, or clearance refers to the （）

  A . clearance between the top of the valve stem and the rocker arm B . compression of the valve springs C . clearance between the valve seat inserts and the head D . out of roundness of the fuel injection cam

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• After ensuring that the （） is correct the bearing clearance should be checked.

  A . nap B . gap C . nip D . deflectio

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• Which of the following may take place if the clearance of the main bearings are excessive?（）

  A . bearing knocks B . dropping of pressure of LO C . noises D . all the above

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• In a diesel engine, when installing new piston rings it is important to check（） Ⅰ.ring gap clearance Ⅱ.side clearance

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰnor Ⅱ

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• To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.

  A . shaft and impeller B . motor and pump shaft C . casing and impeller wearing rings D . lantern ring and impeller

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• Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）

  A . twice as large as with a cast iron piston B . the same size as with a cast iron piston C . half as large as with a cast iron piston D . the same size as the crown of an aluminum pisto

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• Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.

  A . during the valve overlap period B . with only the exhaust valve open C . at a pressure below atmospheric D . without cooling the cylinders or pisto

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• 桥下净空（qiao xia jing kong）clearance underspan

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• Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

  A . closing later B . opening sooner C . staying open for a shorter period of time D . staying open for a longer period of time

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• 启动子的清除（promoter clearance）

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• 英译中：Customs clearance

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• The port clearance for a ship should be granted（）the completion of loading or discharging in the port.

  A . before B . when C . after D . during

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• Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）

  A . jam in the most worn part of the cylinder when the rings expand B . break in the most worn part of the cylinder when the rings expand C . wear eccentrically on the side opposite the end gap D . overheat and jam at the top center on the combustion stroke

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• A vessel engaged in mine clearance operations is called（）.

  A . a vessel restricted in her ability to maneuver B . a vessel not under command C . a vessel constrained by her draught D . a vessel not under way

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• 英译中：Electronic clearance

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• 通航净空（tong hang jing kong ）navigable clearance

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• Clearance gauges at bridges indicate （）.

  A . the height of the tide B . depth of water under the bridge C . charted vertical clearance at mean low water D . distance from the water to low steel of the bridge

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• Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）

  A . back B . side C . gap D . bottom

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• If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）

  A . valve will open later B . valves will close later C . amount of fuel injected will be increased D . amount of fuel injected will be decreased

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• Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.

  A . lower low water B . high water C . low water D . sea level

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• Customs clearance agent acts on behalf of the customs.

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• bridge clearance

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