Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which instrument is used for precise linear measurement in the range of 0.01 mm?
A)
Ruler
B)
Vernier Calliper
C)
Micrometer
D)
Dial Gauge
Option C is correct: Micrometer.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which of the following is a permanent mould casting process?
A)
Die casting
B)
Sand casting
C)
Investment casting
D)
Shell moulding
Option A is correct: Die casting.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
What is the main purpose of heat treatment of steel?
A)
To melt the metal
B)
To increase corrosion
C)
To improve mechanical properties
D)
To decrease weight
Option C is correct: To improve mechanical properties.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
In a diesel engine, fuel is ignited by-
A)
spark plug
B)
glow plug
C)
compression
D)
fuel pump
Option C is correct: compression.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which of the following is not an internal combustion engine?
A)
2-stroke petrol engine
B)
gas turbine
C)
steam turbine
D)
none of these
Option C is correct: steam turbine.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The excess fuel is sent back to the fuel tank through-
A)
high pressure pipe
B)
low pressure pipe
C)
overflow pipe
D)
suction pipe
Option C is correct: overflow pipe.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Air cooling system in engine removes heat by-
A)
Direct air flow over engine surface
B)
Using water and coolant
C)
Radiator fan only
D)
Chemical reaction
Option A is correct: Direct air flow over engine surface.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
A boring head is typically mounted on-
A)
tool post
B)
chuck
C)
boring bar
D)
spindle
Option D is correct: spindle.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which of the following is NOT a component of a water-cooling system?
A)
Water pump
B)
Thermostat
C)
Radiator
D)
Carburettor
Option D is correct: Carburettor.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The working cycle in case of four stroke engine is completed in the following number of revolutions of crankshaft.
A)
½
B)
1
C)
2
D)
4
Option C is correct: 2.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Brazing produces a joint that is generally-
A)
Weaker than soldering
B)
Stronger than soldering
C)
Equal in strength to soldering
D)
As strong as welding
Option B is correct: Stronger than soldering.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Sintering is performed ___________.
A)
at room temperature
B)
below melting point
C)
at cryogenic temperature
D)
above melting point
Option B is correct: below melting point.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Capstan and turret lathes are used for-
A)
heavy-duty turning only
B)
one-off parts
C)
mass production of identical parts
D)
sheet metal cutting
Option C is correct: mass production of identical parts.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The process of extracting metal from its ore is called-
A)
refining
B)
casting
C)
metallurgy
D)
welding
Option C is correct: metallurgy.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
What is the primary purpose of lubrication in an automobile engine?
A)
Increase engine temperature
B)
Reduce friction between moving parts
C)
Improve fuel combustion
D)
Increase engine speed
Option B is correct: Reduce friction between moving parts.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which pattern material is used for investment casting process?
A)
Wax
B)
Wood
C)
metal
D)
Plastic
Option A is correct: Wax.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Error of measurement =
A)
True value – Measured value
B)
Precision - True value
C)
Measured value – True Value
D)
True value – Precision value
Option C is correct: Measured value – True Value.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The lowest temperature at which the oil ceases to flow when cooled is known as-
A)
flash point
B)
fire point
C)
cloud point
D)
pour point
Option D is correct: pour point.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
What causes tyre sidewall bulges?
A)
Overinflation
B)
Internal damage from impact or potholes
C)
Regular driving
D)
Tyre rotation
Option B is correct: Internal damage from impact or potholes.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The air-fuel ratio of petrol engine is controlled by-
A)
carburettor
B)
inlet valve
C)
fuel pump
D)
governor
Option A is correct: carburettor.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
A good lubricant should not possess which of the following characteristic?
A)
Low freezing point
B)
Low boiling point
C)
Thermal stability
D)
Chemical inertness
Option B is correct: Low boiling point.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
In diesel engine, the fuel is ignited by-
A)
spark
B)
injected fuel
C)
heat resulting from compressing air that is supplied for combustion
D)
ignitor
Option C is correct: heat resulting from compressing air that is supplied for combustion.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Hollow casting are created using
A)
pressure die casting
B)
investment casting
C)
slush casting
D)
sand casting
Option C is correct: slush casting.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which type of engine typically has a higher power-to-weight ratio?
A)
2-stroke engine
B)
4-stroke engine
C)
Both engines have the same power-to-weight ratio
D)
Depends on the specific engine design
Option A is correct: 2-stroke engine.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which machine tool is known as the mother machine tool?
A)
Drill
B)
Milling
C)
Lathe
D)
Grinding
Option C is correct: Lathe.
