轮机英语各章节考点试题

1船舶主推进装置（19-20’）

1.1船舶动力装置概述

1.1.1船舶动力装置的组成和类型及对船舶动力装置的要求

1. Each type of engine has its application on board ship. The ____ main propulsion diesel engine operates on the two-stroke cycle.

A. low speed

B. medium speed

C. high speed

D. steam speed

1.2 船舶柴油机

1.2.1 船舶柴油机的基本特性

2. The cetane number of a diesel fuel oil indicates its ____.

A. viscosity

B. acid content

C. heating value

D. ignition quality

3. The operation between two fuel injections is called a ____.

A. turning cycle

B. working cycle

C. working hour

D. working stroke

1.2.2 船舶柴油机的工作原理和基本结构

4. The greatest turbulence in a diesel engine cylinder is created by the ____.

A. shape of the combustion chamber

B. fuel injection spray pattern

C. cylinder swept volume

D. degree of penetration of the fuel oil droplets

5. Because the tie bolts are so close to the crankshaft, some engines employ____ to hold the crankshaft main bearing cap in position instead of conventional studs and nuts.

A. through bolts

B. jack bolts

C. tap bolts

D. fitted bolts

6. ____for attachment to the propeller shaft also accommodates the turning gear and is integrally forged the crankshaft.

A. The coupling flange

B. The camshaft

C. The crosshead pin

D. The cylinder jackets

7. Which of the two events listed occurs simultaneously in a two-stroke \cycle diesel engine?

A. Exhaust and scavenging

B. Scavenging and compression

C. Ignition and expansion

D. Exhaust and compression

8. The rotary motion of a diesel engine piston crankshaft is obtained from the up and down motion of the piston via the _____.

A. camshaft

B. reduction gears

C. rocker arm

D. connecting or piston rod

9. Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by___.

A. cylinder valve

B. compression rings

C. piston skirts

D. oil rings

10. On a large diesel engine installation, crankshaft axial alignment is maintained by the____.

A. piston rod guides

B. engine thrust bearing

C. crosshead bearing

D. main shaft flexible coupling

11. In a two-stroke cycle diesel engine, the process of scavenging begins as the ____.

A. piston nears and passes TDC

B. latter part of down stroke

C. piston passes BDC

D. early part of the down stroke

1.2.3 船舶柴油机的工作系统、操纵系统和控制系统

12._____controls the fuel oil temperature in order to provide oil at the correct viscosity for combustion.

A. The pressure switch

B. The temperature controller

C. The flow meter

D. The viscosity regulator

13. A___ ensures a constant pressure at the fuel line.

A. transfer pump

B. control air bottle

C. pressure regulating valve

D. non returning valve

14. Oil control rings used in two-stroke cycle diesel engines are located near the bottom of the piston