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261 câu hỏi
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1
What part moves up and down creating power ?

Piston

2
The major difference in Two stroke and Four stroke engines is ?

Number of strokes to complete a power cycle

3
Engine displacement is the measure of ?

How much air all the pistons can move in a singular stroke

4
Of the two valves inside the engine, which one is bigger ?

Intake

5
The motion of the cam is transferred to the valves through ?

Rocker arms

6
If the engine coolant leaks into the engine oil, then engine oil ?

Appears milky

7
The oil pump is driven by the ?

Crankshaft directly

8
What is the order of operation of a 4 stroke engine ?

Intake, Compression, Power, Exhaust

9
Fills the area of the engine called the Cylinder ?

Piston

10
The size of the engine intake valve is ?

Larger than that of exhaust valve

11
The device used to measure the clearance between the valve and tappet of an IC Engine is ?

Feeler gauge

12
By which relation speed of piston can be calculated inside cylinder block (L-Length of stoke, D-Diameter, N-speed of engine) ?

2LN

13
The vehicle ride will be comfortable if ?

Unsprung mass is kept minimum

14
The effect of having excess camber is ?

Uneven tyre wear

15
If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about ?

10:1

16
The co-efficient of rolling resistance for a truck weighing 63 500 N is 0.018. The rolling resistance to the truck is ?

1143 N

17
For idling condition in automotive engines, the air-fuel mixture must be ?

Rich

18
For cruising condition in automotive engines, the air-fuel mixture must be ?

Lean

19
For high power condition in automotive engines, the air-fuel mixture must be ?

Rich

20
To prevent overheating of exhaust valve and the area near it, the air-fuel mixture must be ?

Rich

21
____________ is the method of governing used in petrol engine ?

Quality governing

22
What is the purpose of this tool ?

To remove oil filter from the engine

23
What tool are use when tighten cylinder head bolt ?

Torque Wrench

24
What is the last stoke in the 4-stroke cycle engine ?

Exhaust stroke

25
Which system use this component ?

Exhaust System

26
Heat engines burn a ________ to create heat which is then used to do work ?

Fuel

27
The pistons of IC engines are usually made of ______________?

Aluminium alloy

28
The ___________ is called the backbone of an engine ?

Crankshaft

29
The major function of the camshaft is to operate the ___________ valves ?

Inlet and exhaust valves

30
The piston _____ in the cylinder bore to evacuate the combustion chamber ?

Moves downward

31
A petrol engine, whether four- or two-stroke, is called a _____ ?

Spark Ignition engine

32
There are two methods by which fuel is injected into a combustion chamber, they are _____?

Direct or indirect injection.

33
Spark plug are mounted inside ________?

Crank case

34
Which of the following provides passages for flow of cooling water ?

Cylinder head

35
What transfers motion from the camshaft to the push rod in an OHV engine ?

Lifter

36
This component can also be used to help balance the engine ?

Flywheel

37
Improved fuel economy can be acheived with ?

A dual mass flywheel

38
What Recharges the battery while your car is running ?

Alternator

39
What Makes The Engine Turn ?

Starter

40
How does oil affect your engine ?

B & C

41
What kind of engine do we use the most nowadays ?

Internal Combustion Engine

42
What is meant by gear ratio ?

The ratio of number of teeth on pinion and number of teeth on gear

43
In a single dry plate clutch, torsional vibrations are absorbed by ?

Coil springs known as torsional springs

44
What are the three main types of gear teeth ?

Spur, Double Helical and Helical

45
What is a typical gear oil ?

EP80

46
Gear oil rated EP stands for ?

Extreme pressure

47
The forth gear ratio is likely to be ?

1:1

48
How many shafts are typically in a rear wheel drive gear box ?

3

49
What are the shafts found in a rear wheel drive gear box ?

Lay shaft, main shaft, input shaft

50
which gear uses straight cut gears ?

Reverse

51
What are these components ?

Baulking/Syncro rings

52
What is the function of the interlock mechanism ?

To ensure that only one gear at a time can be engaged

53
If torque increases:

Speed reduces

54
When a higher gear is engaged:

Less torque is required

55
This type of gear arrangement is known as a ?

Compound gear train

56
Input shaft can also be termed as:

First motion shaft or Primary drive shaft

57
Clutch vibration can be caused by ?

All of them

58
This is another name for a throw out bearing ?

Release bearing

59
Clutch Chatter and a worn crankshaft Thrust bearing can be caused by ?

Excessive crankshaft end play

60
The purpose of transmission in an automobile is ?

To vary the torque at the wheels

61
Identify the transmission layout for the vehicle shown in the image ?

Four wheel drive

62
What is an advantage of a spur gear over a helical gear ?

It is more efficient

63
What is the purpose of a transmission ?

It allows you to idle,control torque and speed output and change direction

64
What is the purpose of the differential ?

To allow driven wheels on the same axle to rotate at different rates

65
Which of the following symptom is caused as a result of brake disc run out ?

Judder during braking

66
A clutch is usually designed to transmit maximum torque which is ?

150 per cent of the maximum engine torque

67
What type of bearing is used for main bearings and connecting rod bearings ?

Plain bearings

68
The torque available at the contact between driving wheels and road is known as ?

Tractive effort

69
A traction control system (TCS) in automobiles controls the ?

Torque that is transmitted by the tyres to the road surface

70
Which one is NOT the components of Automatic Transmission ?

Syncronizer Ring

71
Which type of gear causes the most amount of noise ?

Spur gear

72
On a rear wheel drive vehicle the differential allows ?

Allows drive to be moved through a 90 degree angle

73
What do we call the gear connected to the input power source, such as a motor ?

Driving Gear

74
A clutch is usually designed to transmit maximum torque which is ?

150 per cent of the maximum engine torque

75
Driveline component that connects a drive shaft to a transmission output shaft and allows back and forth drive shaft movement in response to road conditions ?

Slip joint

76
A bearing used to mount and support a two-piece Hotchkiss drive shaft ?

Center support bearing

77
Definition: Type of universal joint that has bearing-capped yokes at right angles to each other, forming a cross shape when each shaft end is connected:

Cardan universal joint

78
Definition: Small metal weight frequently welded to a drive shaft to smooth operation and reduce vibration:

Drive shaft balancing weight

79
Definition: Term for the components and parts that transfer engine power from a vehicle transmission to its drive wheels:

Driveline

80
Definition: A flexible joint that permits changes in driving angles between a driving and driven shaft. It is nicknamed a U-joint:

Universal joint

81
Definition: A flexible joint that permits changes in driving angles between a driving and driven shaft. It is nicknamed a U-joint:

U-joint

82
The majority of car clutches have what sort of springs ?

Diaphragm or Coil

83
When calculating gear ratios in a simple gear train, which is the correct formula ?

Driven divided by Driver

84
Which of the following is not part of a car transmission ?

Semi Shaft

85
The mass (weight) of a vehicle is suspended by ?

Springs

86
Why do you need to keep proper oil levels in your car ?

to ensure the all internal engine parts lubricating

87
Which one is Turbocharger System component ?

Intercooler

88
What will happen if there is no cooling in an engine ?

Pistons swell and rotating assembly seize

89
On standard car and truck engine what type of cooling is used ?

Liquid cooling

90
Air cooled engines use what for cooling ?

Fins on the block

91
In a liquid cooling system they use what ?

Coolant

92
Engine coolant consists of ________?

Water and antifreeze

93
What component takes the heat from the engine and warms the interior of the vehicle ?

Heater Core

94
The _____________ controls the temperature of the engine using a wax pellet submerged in the engine coolant ?

Thermostat

95
Coolant flows into the engine, from the Radiator through this hose ?

Lower radiator hose

96
What is the common name for the device that forces coolant to circulate through the cooling system ?

Water Pump

97
The typical temperature of an engine cooling system that is operating properly is about _____ degrees ?

180-210 degrees Fahrenheit

98
A common color for new coolant could be _________?

Orange

99
The typical cooling system pressure is between ___________?

15 and 18 PSI

100
This is the heart of the A/C system. Driven by the serpentine belt, it pressurizes the refrigerant that cools the air. It also senses temperature changes ?

Compressor

101
Like a miniature radiator that is usually found in front of the actual radiator, it turns hot refrigerant gas into a condensed cooler refrigerant liquid ?

Condenser

102
Also called the Orifice Tube, its job is to constantly monitor the pressure and temperature of the A/C system to determine the exact amount of refrigerant that can safely enter the evaporator ?

Thermal Expansion Valve

103
The most important property of the lubricant is ?

Viscosity

104
The maximum pressure in the lubrication system is controlled by ?

Valve relief

105
The lubricants commonly used in the automobiles are ?

Synthetic oils

106
Mist lubrication system is mainly used in ?

Two-stroke petrol engine

107
Most commonly used lubrication system in automobiles is the ?

Pressure system

108
____________ is the property of lubricating oil due to which the oil particles stick with the metal surfaces ?

Adhesiveness

109
Lubricating oil ?

All of these

110
The lubricant in internal combustion is exposed to ?

High temperature

111
Which one of the following is NOT the property of a good lubricant ?

Becomes thicker after prolonged use

112
The friction is needed to be reduced because ?

It will be reducing the excess heat generation

113
Which of the following is considered a common multi-viscosity engine oil ?

5W-30

114
What type of oil results in low levels of impurities, increases lubricating abilities, reduces sludge from forming, and protects at extremely high temperatures ?

Synthetic

115
When checking hose conditions, which would indicate the need for replacement ?

All of these

116
All of these fluids can be checked with the engine off except ?

Transmission fluid

117
Engine coolant consists of ________?

Water and antifreeze

118
As the temperature of oil increases ________?

Its viscosity decreases and it flows more readily

119
What is engine oil's primary job ?

To lubricate

120
What automobile system is shown in the graphic below ?

Fuel system

121
Fuel pump is ?

A device that moves fuel from the tank to the engine

122
a screen that removes dirt and rust from the fuel system is ?

Fuel filter

123
What is carburetor ?

Mixes fuel and air and supplies it to the engine

124
The cold air collection box contains ?

The air filter

125
Fuel line is ?

A tube that is used to deliver fuel from the fuel tank to the engine

126
With …..……. fuel is sent directly into the cylinder ?

Gasoline direct injection

127
Parts of an automobile fuel system are ?

the filters, the pump, the fuel tank and carburetors

128
Which part of the fuel system removes impurities from fuel ?

Fuel filter

129
Fuels need what to burn ?

Oxygen

130
Fuels are mainly composed of ?

Hydrocarbons

131
Fossil Fuels formed over long periods of time after particles in water settled to the sea floor and formed marine mud. What kinds of particles needed to be present in the marine mud in order for fossil fuels to form ?

Mostly decaying organisms

132
Coal, oil and gas are examples of ?

Fossil fuels

133
Which of the following is NOT a gas that contributes to acid rain ?

H2

134
Which of the following gases, released by animals as a waste product of digestion, can add to global warming ?

Methane

135
Fuels formed from decaying remains of plants and animals that lived millions of years go ?

Sources of energy that do not come from fossil fuels

136
Fossil fuels are classified as nonrenewable because they________ ?

Take millions of years to replace

137
What is number 1 pointing to ?

Air

138
What is number 2 pointing to ?

Choke

139
What is number 5 pointing to ?

throttle

140
Why is gasoline actually not that great of a fuel ?

High knocking index and low octane levels

141
Why do Hydroxyls burn more efficiently than hydrocarbons ?

They contain more oxygen

142
Why do we add ethanol to our gasoline ?

Helps reduce the knocking index and burn more efficiently

143
In what part of the carburetor does the Venturi effect happen in ?

The throat

144
In what part of the carburetor does Bernoulli's principle happen ?

The emulsion tube

145
What does the high speed or emulsion tube air bleed do ?

Bring air into the emulsion tube

146
What side of the carburetor are the air bleeds found on ?

Choke Side

147
What does the bowl vent do ?

Bring air into the fuel bowl to maintain atmospheric pressure

148
On many types of engines, what measures the volume (quantity) and mass (density) of the air entering the engine ?

Mass Airflow Sensor

149
At full speed what positions are the choke and throttle in ?

Choke open, throttle open

150
Which part is responsible for igniting the air-fuel mixture in gasoline engines ?

Spark Plug

151
It is responsible for holding most of the gas in the fuel system ?

Fuel Tank

152
From the fuel tank, it sends fuel up the fuel line and into the fuel rail where it can be injected into a cylinder ?

Fuel Pump

153
It contains jets that will push the gas into the combustion chambers ?

Carburetor

154
Which of the following substances not required for combustion ?

Carbon Dioxide

155
What part of a car holds the electricity ?

Battery

156
The battery is made of lead, water and……… ?

Sulfuric acid

157
What part connects the engine to the alternator to make it turn when the engine turns ?

V-belt

158
What part keeps the battery from charging too much ?

The voltage regulator

159
Where does the current go when the key is turned ?

To the Starter

160
How many volts should a fully charged automotive battery produce ?

12.5 – 12.6

161
What type of current does a car battery produce ?

Direct Current

162
How many volts should a properly operating charging system produce ?

13.5 - 15

163
Which component produces the electricity to charge the battery ?

The Alternator

164
What part of the electrical system keeps the battery charged ?

The alternator

165
What is the negative side of the battery connected to ?

Ground

166
How are the positive and negative battery terminals color coded ?

Red on Positive, Black on Negative

167
In an electrical circuit, what would be considered the load ?

Light bulb, motor, coil...

168
How do car manufacturers save money and space in their electrical circuits ?

By using ground as part of the circuit

169
Which component uses the most amperage in a vehicle ?

Starter

170
When connecting jumper cables to start a car with a dead battery___________?

Always make the final connection to ground

171
Most car batteries contain sulfuric acid, which is________?

Flammable and corrosive

172
What determines the amperage used in a circuit ?

The draw of the load

173
The charging system in a vehicle_________ ?

Only works when the engine is running

174
Vehicle charging systems require the car to be plugged in while the car is not in use ?

False

175
Fuses in an electrical circuit prevent ?

Amperage overload

176
When electrical resistance increases, amperage:

Decreases

177
When the current to a solenoid or relay is disconnected the magnetic field collapses and causes:

A voltage spike

178
The function of an alternator in an automobile is to ?

Continually recharge the battery

179
Which of the following isn’t considered while deciding the optimum firing order of the engine ?

Engine configuration

180
Why is the Dwell meter used ?

To set the contact breaker gap

181
On which condition does the vacuum advance mechanism shift the ignition point ?

Under part-load operation

182
The conventional direction of electric field is ________ ?

Positive to negative

183
Electric field originates at __________?

Positive charge

184
Electric field terminates at ________ ?

Negative charge

185
Which among the following statements is true with regard to electric field lines ?

Electric field lines never intersect

186
Diesel fuel, compared to petrol is ?

More difficult to ignite

187
If the battery doesn't hold the ________ there could be problems in the __________ ?

Charge-charging system

188
It serves as a step-up transformer because it raises the 12 volts battery voltage to thousands of volts ?

Ignition coil

189
It's a conductor component that distributes the output from the coil to the spark plug according to the firing order ?

Rotor

190
It provides a source of energy to supply current to the ignition primary circuit for initial starting purposes ?

Battery

191
It controls the current flow to the coil during normal operation ?

Ballast resistor

192
It serves as a step-up transformer, which raises the nominal battery voltage of 12 volts up to the many thousands of volts ?

Ignition coil

193
It is used to close or open the primary circuit ?

Breaker point

194
It is used to reduce the amount of arcing when the points open the primary circuit ?

Condenser

195
It is used to distribute the surges of high voltage available to the coil tower ?

Rotor

196
It is a system that delivers spark on the combustion chamber ?

Ignition system

197
What is Suspension System ?

Ensures the optimal riding comfort and controllability

198
What is Spring ?

Is the core component of all suspension systems

199
Springs carry the _________ that is applied to the vehicle and also impact forces when traversing uneven terrain ?

Load

200
Which Spring does not belong to the Suspension System ?

Water flush

201
Coil Springs are_________?

The store of energy more than twice per unit volume

202
The air spring can store the most energy than other ________, these springs allow for automatic load-leveling of the vehicle ?

Springs

203
Torsion Bars act as______?

The connection between rotational end to the control arm

204
The shaft of the suspension system to which the tires and wheels are attached ; they are used to drive and support the wheels ?

Axle

205
A system within a vehicle designed to isolate the vehicle body from road bumps and vibrations ?

Suspension System

206
The angle formed through the wheel pivot points when viewed from the side in comparison to a vertical line through the wheel ?

Caster

207
# The movement of a vehicle around its z-axis (vertical axis) felt when the vehicle deviates from its straight path, as when skidding sideways, and the rear comes around ?

Yaw

208
The ability to deform and reform into the same shape ?

Elasticity

209
The suspension system performs all of the following functions EXCEPT:

Monitoring the tread wear of each tire

210
________ are swivel connections mounted in the outer ends of the control arms ?

Ball joints

211
________ dampen spring oscillations by forcing oil through small holes in a piston ?

Shock absorbers

212
All of the following about the flexible joints often found in the steering linkage are true, EXCEPT ?

They can be disassembled, cleaned, and repacked with grease

213
Some shock absorbers ?

Use pressurized nitrogen gas to reduce aeration of the hydraulic fluid

214
What is the purpose of Brake ?

All of these

215
Which of the following is not part of the disc brake system ?

Brake Shoe

216
What does the acronym ABS stand for ?

Anti-lock Braking System

217
Hydraulics uses what as its non-compressible medium ?

Oil

218
Which of the following is not a brake drum component ?

Pads

219
What automobile system is shown in the graphic below ?

Braking system

220
The advantage of a tubeless tyre over tube type tyre is ?

All of these

221
What is the purpose of the braking system ?

The braking system is designed to decrease the speed of the vehicle

222
Why were drum brakes used originally ?

They could be mechanically operated

223
Drum brakes have another advantage that has seen them stay in use despite the advancement of disc brakes ?

The self servo action makes them very good for Handbrake applications

224
Despite the universal acceptance of Disc brakes they do have draw backs ?

They are heavier and more expensive than drums

225
Which component is responsible for for pulling the brake pad away from the disc after the driver releases the pedal ?

The seal around the piston

226
What does 'hydraulics' mean ?

Operated by a liquid

227
Which wheels does the handbrake normally operate on ?

The rear wheels only

228
What are the two types of steering systems we talked about ?

Rack and Pinion

229
_______ allows a drive shaft to transmit power through a variable angle, at constant rotational speed, without an appreciable increase in friction or play. They are mainly used in front wheel drive vehicles ?

CV Axle

230
A customer complains about a shimmy in the steering wheel whenever he/she hits a bump. This is mostly likely caused by:

Failed steering damper

231
Hard steering can be caused by which of the following ?

All of these

232
An automotive battery has how many cells ?

Six

233
Petrol that detonates easily is called ?

Low Octane petrol

234
Leak Check Test and Gas Calibration are required every _____________hours ?

72

235
What is the purpose of the EGR valve ?

Reduce NOX production

236
What two elements combine to form NOx (Nitrogen Oxide) ?

Nitrogen and Oxygen

237
This is the first part of the exhaust system, what is it called ?

Condition, leaks, noise, security

238
What is the name of this component fitted within the exhaust reduce the amount of toxic emissions from the car ?

Catalytic converter

239
What are the bad gasses produced by the engine ?

Oxides of Nitrogen, Carbon monoxide, Hydrocarbons

240
Which of the following statements is not correct with respect to alcohols as alternate fuel ?

Anti-knock characteristics of alcohol are poor

241
Why a small amount of gasoline is added to alcohol ?

To improve cold-weather starting

242
What is a dual fuel engine ?

The engine which uses gaseous and liquid fuel

243
Which of the following has the same combustion as HCCI (Homogeneous Charge Compression Ignition) engine ?

Hybrid of both SI and CI engine

244
Which of the following is true for the HCCI engine ?

Pre-catalyst hydrocarbon emissions are higher

245
For which of the following engine lean-burn concept is ideal ?

SI engine

246
By which technique can the charge stratification be achieved ?

Injection as well as carburation

247
Which of the following is true for stratified charge engine ?

Multi-fuel capabilities

248
What is true about the Wankel engine ?

It has a longer operating cycle

249
Where is the variable compression ratio used ?

SI engine

250
Which of the following is true for stratified charge engine ?

It has multi-fuel capabilities

251
Which of the following is true about the Stirling engine ?

High efficiency, quiet operation and compatible with renewable energy

252
Which of the following is one of the major exhaust emissions from CI engines compared to SI engines ?

Particulates

253
Which of the following causes the photochemical smog ?

NOx and HC

254
What does the blue smoke in diesel engine indicate ?

Unburnt oil

255
During which condition of the vehicle does NOx emission in SI engine will be lowest ?

Idling

256
For what purpose is the Rhodium used ?

To reduce NOx

257
Why is the fumigation technique used ?

To control smoke

258
Why are lead compounds added in petrol ?

Reduce knocking

259
Which of the following cannot be reduced by thermal converters ?

NOx

260
What can be reduced by using exhaust gas recirculation (EGR) effectively ?

NOx

261