11规则大管轮英语模拟二和模拟二的答案!汇总

模拟二

答题说明：请选择一个最合适的答案。第1题至82题，每题1分，第83题至94题，每题

1.5分。

一、单项选择题：

1. Diesel engines are classified as reciprocating internal combustion engines because they

__c__.

A. use energy from fuel burned outside their cylinders

B. burn fuel in a combustion chamber that moves back and forth

C. burn fuel in a chamber where its energy moves a piston back and forth

D. use a continuous combustion process to impart rotary motion to the pistons

2. Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of ____a_.

A. free entry of air to the crankcase

B. water entering the crankcase while engine wash-downs are being performed

C. excessive oil leakage during periods of increased blow-by

D. sub-cooling internal components

3. One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the ___b_____.

A. governor sensitivity

B. exhaust temperature

C. fuel injection pressure

D. speed of the cam shaft

4. Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine? d

A. Viscosity

B. Sulfur content

C. Pour point

D. Cetane number

5. The primary function of a fuel delivery check valve assembly is to___b_____.

A. deliver proper fuel quantity to the injection nozzle

B. provide rapid fuel injection cutoff

C. control fuel quantity entering the pump body

D. control fuel pressure delivered to the combustion chamber

6. For any piston ring to operate smoothly without scuffing, the ring must be ___b___.

A. of a material harder than the cylinder liner

B. properly lubricated

C. prevented from compressing

D. prevented from rotating during engine operation

7. Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to

___d____.

A. maintain low pH in the cooling water

B. reduce the cooling water temperature

C. increase cooling water hardness

D. form a protective film on metal surfaces

8. In a two-stroke/cycle diesel engine, the process of scavenging begins as the _b____.

A. piston nears and passes TDC

B. latter part of the down-stroke

C. piston passes BDC

D. early part of the down-stroke

9. The timing of diesel engine air starting valves is controlled by ____c____.

A. the air start valve timing gears and rods

B. a cylinder check valve

C. the air distributor

D. an air manifold poppet valve