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)
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)
High moisture content in moulding sand can lead to-
A)
blowholes
B)
smooth surface
C)
better strength
D)
no defects
Option A is correct: blowholes.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The inlet valve of a four stroke cycle IC engine remains open for nearly-
A)
235°
B)
180°
C)
125°
D)
200°
Option A is correct: 235°.
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)
A stoichiometric air-fuel ratio is:
A)
chemically correct mixture
B)
lean mixture
C)
rich mixture for idling
D)
the ratio used at full rated parameters
Option A is correct: chemically correct mixture.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The primary function of tailstock in lathe is:
A)
to change the direction of spindle movement
B)
to provide support and bearing for the rotating job
C)
to hold the cutting tool for the machining operations
D)
to control the speed of spindle rotation
Option B is correct: to provide support and bearing for the rotating job.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which of the following part splash the oil to bearings and cylinder walls from the oil sump?
A)
Dipper
B)
Spoon
C)
Scooper
D)
Hopper
Option A is correct: Dipper.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
A device which holds, locate a workpiece, guides and controls one or more cutting tool is called-
A)
jig
B)
fixture
C)
templates
D)
lathe
Option A is correct: jig.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Misrun in casting is due to-
A)
excess metal
B)
incomplete filling of the mould
C)
high pouring temperature
D)
too much venting
Option B is correct: incomplete filling of the mould.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The process of improving the cutting action of the grinding wheel is called-
A)
truing
B)
dressing
C)
facing
D)
clearing
Option B is correct: dressing.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which of the following is used to make moulds in sand casting?
A)
Clay
B)
Cement
C)
Concrete
D)
Green sand
Option D is correct: Green sand.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
In SI engine, during suction stroke-
A)
mixture of air and fuel is sucked in
B)
only air is sucked in
C)
only fuel is sucked in
D)
suction stroke is intermittent, cannot be judged precisely
Option A is correct: mixture of air and fuel is sucked in.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Feed in milling operation is expressed as-
A)
mm/tooth
B)
mm/ r.p.m. of milling cutter
C)
revolutions per minute
D)
metres/minute
Option A is correct: mm/tooth.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The radiator in a water-cooling system function as a-
A)
heat exchanger
B)
fuel tank
C)
water reservoir
D)
filter
Option A is correct: heat exchanger.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Solid injection in IC engines refers to injection of-
A)
solid fuel
B)
liquid fuel and air
C)
solid fuel and air
D)
liquid fuel only
Option D is correct: liquid fuel only.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The purpose of thermostat is to keep the engine-
A)
warm
B)
cool
C)
hot
D)
at desired temperature
Option D is correct: at desired temperature.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
What is the function of the dipstick?
A)
Increase oil flow
B)
Check the oil level
C)
Drain oil
D)
Pressurize oil
Option B is correct: Check the oil level.
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.
