三管轮轮机英语新题

1.The cylinder covers are secured by eight elastic holding-down________ arranged in four pairs.

A. nuts

B. screws

C. studs

D. flanges

2.There is a support ring between the cylinder block and the collar of the cylinder liner, thus carrying both the liner and the cylinder cover. It also passes _________ to the cooling bores and to the cover

A. cooling water

B. cooling oil

C. refrigerant

D. lubricate oil

3.A clearly visible benefit of RT-flex engines is their _________ operation at all ship speeds. This is achieved by the superior combustion performance.

A. shockless

B. smokeless

C. no vibration D . noiseless

4.The key feature of the Sulzer RT-flex system is that it gives complete freedom in the _____ and operation of fuel injection and exhaust valve actuation.

A. metering

B. control

C. using

D. timing

5.The development goals for a large marine engine are many, often interact and in some cases even______ with each other

A. conflict

B. accord

C. harmonize

D. struggle

6.The piston crown employs the usual jet-shaker __________ principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution.

A. water cooling

B. oil cooling

C. air cooling

D. combined cooling

7.The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler ________ and two auxiliary air blowers.

A. dozens

B.parcels

C. Bundles

D. Gallons

8. For auxiliary engines the permissible overload is______ for one hour every twelve hours.

A. 10%

B.15% c.20% D.25%

9．Top piston rings are plasma coated. It gives added safety for the ______ of new liners.

A. running-in

B. running-out

C. running_on

D.running_down

10.Around the combustion chamber, all the main components are ____ to give low thermal strains and the smallest, circumferentially-symmetric deformations for good sealing between piston rings and liner.

A. drill cooled

B. hole cooled

C. tube cooled

D. bore cooled

11.Around the combustion chamber, all the main components are bore cooled to give low _____ strains and the smallest, circumferentially-symmetric deformations for good sealing between piston rings and liner.

A. thermal

B. mechanical

C. plastic

D. elastic

12. The top piston ring is plasma coated to give the lowest wear rate to reach the goal of