Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The purpose of adding wood flour to the moulding sand is to improve-
A)
green strength
B)
hot strength
C)
collapsibility
D)
permeability
Option C is correct: collapsibility.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The purpose of a gate is to-
A)
deliver molten metal into the mould cavity
B)
act as a reservoir for the molten meta
C)
feed the molten metal to the casting in order to compensate for the shrinkage
D)
deliver molten metal from pouring basin to gate
Option A is correct: deliver molten metal into the mould cavity.
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)
A tool used to measure the internal diameter of a hole is:
A)
Bore gauge
B)
Vernier calliper
C)
Outside micrometer
D)
Feeler gauge
Option A is correct: Bore gauge.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Ring gauges are used to measure-
A)
hole depth
B)
external diameters
C)
internal threads
D)
gear profiles
Option B is correct: external diameters.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The main factors which affect tyre life is/are-
A)
Inflation
B)
manner of driving
C)
vehicle maintenance
D)
all of these
Option D is correct: all of these.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The Vernier Calliper’s advantage over the micrometer is that-
A)
it can be used to make both inside and outside measurements over a range of sizes
B)
is more accurate
C)
is easier and quick to use
D)
none of these
Option A is correct: it can be used to make both inside and outside measurements over a range of sizes.
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)
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 of the following is a requirement of a good fuel for automobiles?
A)
Low calorific value
B)
High ignition temperature
C)
High calorific value
D)
Produces large amount of smoke
Option C is correct: High calorific value.
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)
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.
