100+ câu trắc nghiệm Cơ điện tử ô tô có đáp án - Phần 1
25 câu hỏi
As engine rpm increases, the ignition timing must:
Secondary winding Technician A says the battery provides electricity by releasing free electron
Primary winding
Electronic control module (ECM)
Ignition control module
Chọn đáp án C
As engine rpm increases, the ignition timing must:
Retard.
Advance
Remain the same
Remain the same and then retard
Chọn đáp án B
Which of the following components generates a timing signal for the ignition system?
ECU
Crankshaft position sensor
Rotor
Ignition coil
Chọn đáp án B
All of the following components are part of a Distributorless Ignition System (DIS) EXCEPT:
Spark plug
Crankshaft position sensor
Rotor
Ignition coil pack
Chọn đáp án C
The HEAT RANGE of a spark plug can be determined by:
Its part number
The number of electrodes
Its length
Its diameter
Chọn đáp án A
Which of the following components multiplies battery voltage to create a spark?
Ignition pickup
Ignition wires
Ignition module
Ignition coil
Chọn đáp án D
Which of the following can cause changes in Ignition Timing?
Engine RPM
Engine Temperature
Engine Load
Any of the above
Chọn đáp án D
If the Crankshaft Position Sensor is not producing a signal, what will happen?
Ignition timing will be RETARDED
The engine computer will substitute a timing signal
There will be no ignition timing
Ignition timing will be ADVANCED
Chọn đáp án C
An eight cylinder engine running at 3000 rpm requires sparks per SECOND.
200
300
400
100
Chọn đáp án C
In an alternator, alternating current is converted to direct current by the:
Stator
Rectifier
Brushes
Regulator
Chọn đáp án C
CDI stands for:
Coil Dual Ignition
Current Direct Ignition
Capacitor Discharged Ignition
Capacitor Direct Ignition
Chọn đáp án D
A battery that is overcharged can be due to:
loose alternator drive belt
high speed driving
high resistance in the field circuit
defective regulator
Chọn đáp án D
Why is a thermistor used in an alternator regulator?
To control minimum current
To control maximum current
To control maximum voltage
To compensate for temperature change
Chọn đáp án B
What does EMF stand for?
Electromagnetic force
Electromotive force
Electronic magnetic force
Electromated force
Chọn đáp án A
Most vehicles today use the type of ignition system.
Coil-on-plug
Distributor
Breakerless
Waste spark
Chọn đáp án A
The type of ignition system in which two cylinders share one coil is called a:
Coil-on plug ignition system
Distributor ignition system
Waste spark ignition system
None of the above
Chọn đáp án C
In an alternator, which component controls the output?
Diode
Cut-out relay
Current regulator
Voltage regulator
Chọn đáp án D
The basic purpose of the overrunning clutch in the starter drive is to:
disengage the armature when the engine starts
assist the solenoid during cranking.
keep the hold-in winding energized during cranking
pull the starter pinion gear out of mesh
Chọn đáp án A
A solenoid uses two coils. Their windings are called:
push-in and hold-out
push-in and pull-out.
pull-in and hold-in
pull-in and push-out
Chọn đáp án C
The distributor serves the following purposes in the ignition system
It increase voltage
both a and b
It distributes high tension current to spark plug at correct time
None of the above
Chọn đáp án C
In Magneto Ignition system
No battery is required
used in high speed engines
All of the above
Engine starting is rather difficult
Chọn đáp án C
The following is known as ‘Breakerless Ignition system’
Magneto Ignition system
Electronic Ignition system
Battery coil ignition system
Capacitive discharge Ignition system
Chọn đáp án B
The discharged lead acid battery has on its plates
Lead peroxide (PbO₂)
Spongy lead (Pb)
Sulphuric acid (H₂SO₄)
Lead sulphate (PbSO₄)
Chọn đáp án D
The main task of a battery in automobiles is to
Supply electricity to the vehicle's electrical system at all times while the engine is running
Act as a reservoir or stabilizer of electricity
Supply electricity to the alternator
Supply a large amount of power to turn the starter motor when the engine is cranking
Chọn đáp án D
During charging the specific gravity of the electrolyte of a lead acid battery
Remains the same
Becomes zero
Decreases
Increases
Chọn đáp án D
