单选题Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.A during the valve overlap periodB with only the exhaust valve openC at a pressure below atmosphericD without cooling the cylinders or pistons

题目

单选题

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

during the valve overlap period

with only the exhaust valve open

at a pressure below atmospheric

without cooling the cylinders or pistons

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相似问题和答案

第1题：

During the valve overlap period, the exhaust pressure of a turbocharged four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure ______.

A.effective cylinder scavenging and cooling

B.constant pressure from the turbochargers

C.cooler operation of the exhaust system

D.effective constant pressure for turbocharger operation

正确答案：A

第2题：

Which presents the heirarchical relationship between LVM entities？（）

A、Volume Group > Physical Volume > Logical Volume > Filesystem
B、Physical Volume > Volume Group > Logical Volume > Filesystem
C、Volume Group > Physical Volume > Filesystem > Logical Volume
D、Physical Volume > Volume Group > Filesystem > Logical Volume

正确答案:A

第3题：

在下面的运算符重载函数的原型中，错误的是

A．Volume operator－(double,double)；

B．double Volume::operator－(double)；

C．Volume Volume::operator－(Volume)；

D．Volume operator－(Volume,Volume)；

正确答案：A
解析：本题考核运算符重载。C＋＋把重载的运算符视为特殊的函数，称为运算符函数，函数名就是在运算符前加上保留字operator。运算符重载的定义格式：返回类型＞operator　　运算符号＞(参数说明)；
　运算符“一”是二元运算符，A选项中重载函数的形参列表都double，而重载函数的返回类型为类Volume，显然是错误的。

第4题：

单选题

Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）

supercharging

scavenging

turbulence

swept volume charging

正确答案： C

解析：暂无解析

第5题：

单选题

Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.

a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine

a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine

two medium-speed, turbocharged, four-stroke diesel engines

a variable-speed AC generator

正确答案： A

解析：暂无解析

第6题：

clearance，C

正确答案:是指两肾在单位时间（一般用每分钟）内能将多少毫升血浆中所含的某一种物质完全清除，这个被完全清除了某物质的血浆的毫升数就称为该物质的清除率.C=UV/P

第7题：

单选题

（）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）

Inefficient scavenging；twice

Inefficient scavenging；1~8 times

Fewer strokes in a circle；twice

Fewer strokes in a circle；1~8 times

正确答案： B

解析：暂无解析

第8题：

下列运算符重载函数的原型错误的是( )。

A．Volume operator-(double，double)；

B．double Volume：：operator-(double)；

C．Volume Volume：：operator-(Volume)；

D．Volume operator-(Volume，Volume)；

正确答案：A
解析：运算符重载也是一种函数重载。函数重载要求编译器能够唯一地确定调用一个函数时应该执行哪个函数代码，即采用哪个函数实现。确定函数实现时，要求从函数参数的个数和类型上来区分。也就是说，进行函数重载时，要求同名函数在参数个数上不同，或者参数类型上不同。否则，无法实现重载。选项A重载的减号运算符与C++默认提供的两个double相减运算无法区别。

第9题：

单选题

Which presents the heirarchical relationship between LVM entities？（）

Volume Group > Physical Volume > Logical Volume > Filesystem

Physical Volume > Volume Group > Logical Volume > Filesystem

Volume Group > Physical Volume > Filesystem > Logical Volume

Physical Volume > Volume Group > Filesystem > Logical Volume

正确答案： B

解析：暂无解析

第10题：

单选题

A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke

(1) only is correct

(2) only is correct

both (1) and (2) are correct

Neither (1) or (2) are correct

正确答案： C

解析：暂无解析

Clearance volume scavenging in a turbocharged, four-stroke/c

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