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【单选题】

While engine is in operation the piston moves up and down, thus causing the rotation of the （）.

A、crankcase

B、slipper

C、cam housing

D、crankshaft

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更多“While engine is in operation the piston moves up and down, thus causing the rotation of the （）.”相关的问题

第1题

[单选题] Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）

A、In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater B、Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports C、No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine D、The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine

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第2题

[单选题] In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.

A、fluctuates with the engine speed to some extent, independent of the engine speed B、keeps constant at all engine speed, dependent on the engine speed to some extent C、keeps constant at all engine speed, independent of the engine speed D、is decided by the engine speed, constant at all engine speed

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第3题

[单选题] Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）

A、The coolant temperature must be maintained at 180℃ B、The thermostatic bypass valves must be manually opened before the engine is started C、The pressure cap must be removed while the engine is secured D、Electrical power to the heater must be secured before the cooling system is drained

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第4题

[单选题] Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）

A、bearing pressure in a four-stroke\cycle acting single diesel engine is continually reversed B、bearing pressure in a two-stroke\cycle single acting diesel engine is continually reversed C、the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine D、two-stoke/cycle diesel engines require more complicated lubrication piping

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第5题

[单选题] The size of the exhaust valve opening is （）

A、most critical in a four-stroke cycle diesel engine B、most critical in a two-stroke/cycle diesel engine C、most critical in a four-stroke/cycle diesel engine if it is turbocharged D、of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine

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第6题

[单选题] The BACKUP_TAPE_IO_SLAVES parameter is set to FALSE for the database instance. Which statement is true while performing a tape backup in an RMAN session?（）

A、The tape I/O performed is asynchronous B、The tape buffer is allocated from the System Global Area (SGA) C、The tape buffer is allocated from the Program Global Area (PGA) D、Oracle I/O uses an interrupt mechanism to determine when each I/O completes

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第7题

[单选题] While a ship with twin screw is making a turn, in order to prevent overload, the duty engineer should （）

A、reduce the fuel feeding of main engine of inner propeller B、reduce the fuel feeding of main engine of outer propeller C、firstly reduce the fuel of main engine of inner propeller, then reduce the fuel feeding of engine of outer propeller D、reduce fuel feeding of two engines at the same time

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第8题

[单选题] The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is（）.

A、caused by retarded injection timing B、caused by a mechanical defect in one cylinder C、caused by high fuel injection pressures D、normal for these conditions

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第9题

[单选题] The BACKUP_TAPE_IO_SLAVES parameter is set to FALSE for the database instance. Which statement istrue while performing a tape backup in an RMAN session?（）

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