Motor Vehicle Inspector • 2025 • Paper-IV
Cooling fans in modern cars are driven by:
A)
Only belt drive
B)
Only electric motor
C)
Gears and belts
D)
Either electric motor or belt drive
Option D is correct: Either electric motor or belt drive.
Motor Vehicle Inspector • 2025 • Paper-IV
Which of the following is not a function of engine lubrication?
A)
Cooling of engine parts
B)
Sealing between piston and cylinder
C)
Fuel atomization
D)
Cleaning of engine components
Option C is correct: Fuel atomization.
Motor Vehicle Inspector • 2025 • Paper-IV
The main advantage of radial tyres over cross ply tyres is:
A)
Lower mileage
B)
Better fuel economy and grip
C)
Higher rolling resistance
D)
Poor cornering stability
Option B is correct: Better fuel economy and grip.
Motor Vehicle Inspector • 2025 • Paper-IV
Conventional chassis frame is usually made from:
A)
Cast iron
B)
Mild steel channel sections
C)
Stainless steel tubes
D)
Aluminium alloy
Option B is correct: Mild steel channel sections.
Motor Vehicle Inspector • 2025 • Paper-IV
A ‘spongy’ brake pedal in hydraulics is usually caused by:
A)
Excess fluid pressure
B)
Air in brake lines
C)
Sticking brake shoes
D)
High friction coefficient of lining
Option B is correct: Air in brake lines.
Motor Vehicle Inspector • 2025 • Paper-IV
In the magneto ignition system, electricity is generated by:
A)
Battery only
B)
Generator
C)
Permanent magnets and coils
D)
Alternator
Option C is correct: Permanent magnets and coils.
Motor Vehicle Inspector • 2025 • Paper-IV
The main purpose of a brake in an automobile is to:
A)
Reduce engine vibration
B)
Convert kinetic energy into heat energy
C)
Increase tyre grip on wet roads
D)
Control fuel consumption
Option B is correct: Convert kinetic energy into heat energy.
Motor Vehicle Inspector • 2025 • Paper-IV
Tubular frame is commonly found in:
A)
Racing cars and motorcycles
B)
Heavy duty buses
C)
Multi axle trucks
D)
Tractors
Option A is correct: Racing cars and motorcycles.
Motor Vehicle Inspector • 2025 • Paper-IV
Water cooled engines are preferred in cars because they:
A)
Weigh less
B)
Operate more quietly and evenly
C)
Are cheaper to manufacture
D)
Need no radiator
Option B is correct: Operate more quietly and evenly.
Motor Vehicle Inspector • 2025 • Paper-IV
Dwell in ignition systems refers to:
A)
Distance between spark plug electrodes
B)
Angle/time contact points remain closed
C)
Period between two sparks in the same cylinder
D)
Duration of combustion in cylinder
Option B is correct: Angle/time contact points remain closed.
Motor Vehicle Inspector • 2025 • Paper-IV
In a simple carburettor, the air-fuel ratio is controlled by:
A)
Spark plug
B)
Float chamber
C)
Throttle valve
D)
Radiator
Option C is correct: Throttle valve.
Motor Vehicle Inspector • 2025 • Paper-IV
Which of the following components is found only in water-cooled systems?
A)
Cylinder fins
B)
Radiator
C)
Spark plug
D)
Piston
Option B is correct: Radiator.
Motor Vehicle Inspector • 2025 • Paper-IV
High viscosity index means:
A)
Large change with temp
B)
Small change with temp
C)
Low boiling point
D)
Poor film strength
Option B is correct: Small change with temp.
Motor Vehicle Inspector • 2025 • Paper-IV
The main purpose of a dynamo or alternator in a vehicle is to:
A)
Control speed
B)
Start the engine
C)
Generate electricity to charge the battery and power electrical components
D)
Supply fuel to the engine
Option C is correct: Generate electricity to charge the battery and power electrical components.
Motor Vehicle Inspector • 2025 • Paper-IV
Commercial vehicles mostly use which type of wheel?
A)
Alloy wheels
B)
Plastic wheels
C)
Pressed steel disc wheels
D)
Wooden wheels
Option C is correct: Pressed steel disc wheels.
Motor Vehicle Inspector • 2025 • Paper-IV
The cetane number is a measure of:
A)
Self ignition quality of diesel fuel
B)
Burning velocity of petrol
C)
Lead content in petrol
D)
Hydrocarbon emission level
Option A is correct: Self ignition quality of diesel fuel.
Motor Vehicle Inspector • 2025 • Paper-IV
A van body used for goods transport is generally:
A)
Closed box type
B)
Open platform type
C)
Semi cab type
D)
Articulated type
Option A is correct: Closed box type.
Motor Vehicle Inspector • 2025 • Paper-IV
Negative plate of a lead acid battery is:
A)
Lead dioxide (PbO2)
B)
Sponge lead (Pb)
C)
Lead sulphate (PbSO4)
D)
Dilute sulphuric acid (H2SO4)
Option B is correct: Sponge lead (Pb).
Motor Vehicle Inspector • 2025 • Paper-IV
The main function of a headlamp in a vehicle is to:
A)
Alert the driver
B)
Illuminate the road ahead during low visibility
C)
Start the engine
D)
Indicate speed
Option B is correct: Illuminate the road ahead during low visibility.
Motor Vehicle Inspector • 2025 • Paper-IV
What component ensures smooth engine operation at idle speed?
A)
Accelerator pump
B)
Idle jet
C)
Choke
D)
Venturi
Option B is correct: Idle jet.
Motor Vehicle Inspector • 2025 • Paper-IV
If the float valve gets stuck often, what is the likely effect?
A)
Air filter will clog
B)
Fuel overflow from carburettor
C)
Engine overheating
D)
Lean mixture
Option B is correct: Fuel overflow from carburettor.
Motor Vehicle Inspector • 2025 • Paper-IV
Which lubrication system is commonly used in high-speed automobile engines?
A)
Splash system
B)
Semi-pressure system
C)
Pressure lubrication system
D)
Gravity system
Option C is correct: Pressure lubrication system.
Motor Vehicle Inspector • 2025 • Paper-IV
Anti-freeze is typically mixed with:
A)
Petrol
B)
Engine oil
C)
Brake fluid
D)
Water
Option D is correct: Water.
Motor Vehicle Inspector • 2025 • Paper-IV
The usual ratio for mixing anti-freeze with water in automotive applications is:
A)
90:10
B)
70:30
C)
50:50
D)
10:90
Option C is correct: 50:50.
Motor Vehicle Inspector • 2025 • Paper-IV
Which of the following engine components is not directly lubricated by the oil system?
A)
Camshaft
B)
Crankshaft
C)
Piston rings
D)
Spark plug
Option D is correct: Spark plug.
