Automobile Electrical and electronics System
1)In Battery coil ignition system, the correct
sequence of flow of current is
(A) Battery
– Ammeter – Ignition coil – Distributor – Spark plug
(B) Battery
– Ignition coil – Ammeter – Distributor – Spark plug
(C) Battery
– Ammeter – Distributor – Ignition coil – Spark plug
(D) Battery
– Distributor – Ammeter – Ignition coil – Spark plug
2)The distributor serves the following
purposes in the ignition system
(A) It
operates break and make mechanism
(B) It
distributes high tension current to spark plug at correct time
(C) both (A)
and (B)
(D) None of
the above
3)The drive shaft in distributor is rotated at
___ the engine speed in four stroke engine
(A) half
(B) equal to
(C) one and
half times
(D) double
4) In Magneto Ignition system
(A) No
battery is required
(B) Engine
starting is rather difficult
(C) used in
high speed engines
(D) All of
the above
5) The following is known as
‘Breakerless Ignition system’
(A) Battery
coil ignition system
(B) Magneto
Ignition system
(C)
Electronic Ignition system
(D) Capacitive
discharge Ignition system
6) The following is (are) the
advantage(s) of Electronic Ignition system
(A) Produces
maximum output voltage
(B) Better
starting with cold engine
(C) Less
possibility of arcing at spark plug
(D) All of
the above
7) How
many cells are used in a 12 volt car battery?
(A)
2
(B)
4
(C)
6
(D)
8
8) The
capacity of a battery is usually expressed in terms of
(A)
Volts
(B)
Amperes
(C)
Weight
(D)
Ampere hours
9) The
acid used in automobile battery is
(A) Hydrochloric
acid
(B) Hydrofluoric
acid
(C) Nitric
acid
(D)
Sulphuric acid
10) The
positive plates of a lead acid battery has
(A)
Lead peroxide (PbO₂)
(B)
Spongy lead (Pb)
(C)
Lead sulphate (PbSO₄)
(D)
Sulphuric acid (H₂SO₄)
11) The
air gap between the central electrode and ground (or side) electrode of a spark
plug is around
(A)
0.2 mm
(B)
0.5 mm
(C)
1 mm
(D)
1.5 mm
12) When
the battery is half (50%) charged, the specific gravity of acid in a battery is
usually
(A)
0.74
(B)
1.00
(C)
1.12
(D)
1.19
13) The
discharged lead acid battery has on its plates
(A)
Lead peroxide (PbO₂)
(B)
Spongy lead (Pb)
(C)
Lead sulphate (PbSO₄)
(D)
Sulphuric acid (H₂SO₄)
14) The
main task of a battery in automobiles is to
(A)
Supply electricity to the alternator
(B) Act
as a reservoir or stabilizer of electricity
(C) Supply
electricity to the vehicle's electrical system at all times while the engine is
running
(D) Supply
a large amount of power to turn the starter motor when the engine is being started
15) The
frequency of flashing of light per minute in a direction (side turn) indicator
is about
(A)
9
(B)
90
(C)
900
(D)
9000
16) The
ignition coil is used to
(A) Step
up current
(B) Step
down current
(C) Step
up voltage
(D) Step
down voltage
17) With
the increase of battery temperature, the specific gravity of electrolyte
(A)
Increases
(B)
Decreases
(C)
Remains the same
(D) None
of these
18) A
battery can be charged by
(A) Adding
distilled water
(B) Adding
sulphuric acid
(C) Applying
voltage in the reverse direction to that of charging
(D) Applying
a voltage in the same direction to that of charging
19) The
best fuels for compression ignition engines are
(A) Straight
chain paraffin
(B)
Aromatics
(C) Branched
chain paraffin
(D)
Naphthalene
20) The
most accurate ignition system of a spark ignition engine is
(A)
Magneto system
(B) Battery
system
(C) Electronic
control unit system
(D) Magneto
and electronic system
21) The
negative terminal post on the top of a battery is
(A)
Smaller than the positive terminal post
(B) Larger
than the positive terminal post
(C) Of
the same size as the positive terminal post
(D)
None of these
22) The
function of an alternator in an automobile is to
(A) Supply
electric power
(B) Converts
mechanical energy into electrical energy
(C) Continually
recharges the battery
(D) Partly
converts engine power into electric power
23) During charging the specific gravity of the electrolyte of a lead acid battery
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
24) When a lead acid battery is in fully charged condition the colour of its positive plate is
A. Dark green
B. Brown
C. Dark brown
D. None of the above
25) Active
materials of a lead acid cell are
A. Spongy lead
B. Lead peroxide
C. Dilute H2SO4
D. All of the above
26) Trickle charger of a
storage battery helps to
A. Maintain proper electrolyte
level
B. Increase its reverse capacity
C. Prevent sulphation
D. Keep it fresh and fully
charged
27) On over
charging a battery
A. It will bring about chemical
change in active materials
B. It will increase the capacity
of the battery
C. It will raise the specific
gravity of the electrolyte
D. None of the above
28) Cells
are connected in parallel to
(A) Increase
the efficiency
(B) Increase
the current capacity
(C) Increase
the voltage output
(D) Increase
the internal resistance
