思农歉式鹊惦颧使屡衅沽绿堵
第一章 单元测试
1、 The heart of automobile is ( )
A:chassis
B:electric system
C:engine
D:body
答案: engine
2、 ( ) holds all the main components and parts together.
A:clutch
B:brake
C:engine
D:chassis
答案: chassis
3、 ( ) is a sheet metal shell with windows, doors, a hood, and a trunk deck built into it.
A:clutch
B:body
C:engine
D:chassis
答案: body
4、 Automobile have many kind of structure and shape, but their basic structure is different each other.（ ）
A:对
B:错
答案: 错
5、 Any automobile is composed of the section such as engine, chassis, body, electric system. （ ）
A:对
B:错
答案: 对
第二章 单元测试
1、 The ( ) stores liquid fuel and delivers it to the engines.
A:braking system
B:fuel system
C:cooling system
D:steering system
答案: fuel system
2、 The ( ) circuits coolant through the engine and the walls of the engine block and head
A:body
B:water pump
C:fuel tank
D:clutch
答案: water pump
3、 As the crankshaft nears the its second complete revolution, the piston again approaches the ( )position.
A:BDC
B:BBDC
C:TDC
D:ATDC
答案: TDC
4、 After circulating through the engine, the oil drops back to the oil pan.（ ）
A:错
B:对
答案: 对
5、 The exhaust system can not reduce the noise of the burned gases leaving the engine cylinders. （ ）
A:对
B:错
答案: 错
第三章 单元测试
1、 The ( ) in the cylinder is connected to the top of a connecting rod.
A:valve
B:crankshaft
C:piston
D:cylinder
答案: piston
2、 A crankshaft’s job in an engine is to ( )
A:change linear motion into rotational motion
B:keep cylinder heads in place
C:convert fuel energy into mechanical energy
D:deliver fuel to the cylinders
答案: change linear motion into rotational motion
3、 The crank connecting rod mechanism consists of three parts—( ).
A:engine block group
B:crankshaft and flywheel group
C:camshaft and valve group
D:piston and connecting rod group
答案: engine block group
,crankshaft and flywheel group
,piston and connecting rod group
4、 Crank-connecting rod mechanism is the main working mechanism of reciprocating internal combustion engine.（ ）
A:对
B:错
答案: 对
5、 The top of the cylinder block is covered with the cylinder head. （ ）
A:错
B:对
答案: 对
第四章 单元测试
1、 An average air/fuel ratio for good combustion is about ( ) by weight.
A:13:1
B:18:1
C:15:1
D:20:1
答案: 15:1
2、 A valve consists of a( )and ( )stem. （ ）
A:tappet
B:rocker
C:stem
D:head
答案: stem
,head
3、 The ( )provides the force necessary to close the valve and hold it tightly against its seat.
A:valve spring
B:tappet
C:valve
D:rod
答案: valve spring
4、 The inlet valve is opened before TDC and closed after BDC.（ ）
A:对
B:错
答案: 对
5、 Camshaft’s function is to deliver spark positively and timely in a definite sequence. （ ）
A:错
B:对
答案: 错
第五章 单元测试
1、 The ( ) that the injector is open, the more fuel is injected.
A:smaller
B:shorter
C:bigger
D:longer
答案: longer
2、 Most vehicles today use ( ) injector per cylinder.
A:4
B:1
C:2
D:3
答案: 1
3、 The （ ）on the fuel tank is used to keep the fuel from splashing out, release the vacuum created by the fuel removing, and prevent vapors from escaping directly into the atmosphere.
A:baffle
B:sump
C:fuel cap
D:filter
答案: fuel cap
4、 For a diesel fuel goes to the carburetor, then to the fuel nozzles.（ ）
A:错
B:对
答案: 错
5、 The fuel system supplies gasoline or diesel fuel to the oil pan. （ ）
A:对
B:错
答案: 错
第六章 单元测试
1、 What is the cooling agent in the liquid cooling system? ( )
A:air
B:coolant
C:lubrication
D:gasoline
答案: coolant
2、 The water pump uses ( ) to send fluid to the outside while it spins, causing fluid to be drawn from the center continuously.
A:gas force
B:centrifugal force
C:gravity
D:friction
答案: centrifugal force
3、 The cooling system of a water-cooled engine consists of the engine’s water jacket, a（ ）and radiator cap, a cooling fan (electric or belt-driven), hoses, and usually an expansion (overflow) tank.
A:water pump
B:radiator
C:thermostat
D:fuel cap
答案: water pump
,radiator
,thermostat
4、 The cooling system is designed to work all the time when the engine is running.（ ）
A:错
B:对
答案: 错
5、 Some engines are coated the inside of the top of the cylinder head with a thin layer of ceramic to reduce the amount of heat that is transferred from the combustion chamber to the metal parts of the engine. （ ）
A:错
B:对
答案: 对
第七章 单元测试
1、 1.For an engine to make the best use of the fuel, the spark should occur before the piston reaches the top of（ ）。
A:the compress stroke
B:the exhaust stroke
C:the intake stroke
D:the compression stroke
答案: the compression stroke
2、 The piston speed increases as the engine speed increases. This means that the faster the engine goes, the spark has to occur（ ）。
A:uncertain
B:later
C:no change is necessary
D:earlier
答案: earlier
3、 According to your understanding, retarding the timing may also eliminate（ ）。
A:ignition
B:knocking
C:compression
D:combustion
答案: knocking
4、 The primary role of the distributor is to distribute high voltage from the（ ）to the correct cylinder.
A:coil
B:spark plug
C:rotor
D:piston
答案: coil
5、 Functions of ignition system are （ ）
A:ignite the mixture piston
B:send spark to correct cylinder
C:create a spark
D:control the timing of spark
答案: ignite the mixture piston
,send spark to correct cylinder
,create a spark
,control the timing of spark
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