Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The calorific value of gaseous fuels is expressed in terms of-
A)
kcal
B)
kcal/kg
C)
kcal/m3
D)
kcal/m2
Option C is correct: kcal/m3.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The part load efficiency of a carburettor is:
A)
maximum
B)
optimum
C)
poor
D)
constant
Option C is correct: poor.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which of the following is not a component of 4- stroke diesel engine?
A)
crankshaft
B)
carburettor
C)
camshaft
D)
piston
Option B is correct: carburettor.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
The compression ratio of a Diesel engine is generally __________ the compression ratio of a petrol engine.
A)
less than
B)
equal to
C)
more than
D)
none of the above
Option C is correct: more than.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Flux in welding process acts as-
A)
catalyst
B)
filler
C)
protective agent
D)
heat generator
Option C is correct: protective agent.
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)
The lathe tool is usually made of-
A)
high-speed steel (hss)
B)
mild steel
C)
cast iron
D)
aluminium
Option A is correct: high-speed steel (hss).
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
_________ tyre construction has cords arranged at an angle to the direction of travel.
A)
Radial
B)
Tubeless
C)
Bias-ply
D)
Directional
Option C is correct: Bias-ply.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Which of the following is a limit gauge?
A)
Dial indicator
B)
Vernier calliper
C)
Plug gauge
D)
Micrometer
Option C is correct: Plug gauge.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
Grinding wheel is flooded with coolant in order to-
A)
remove chips
B)
remove heat
C)
clean the wheel
D)
clean the job
Option B is correct: remove heat.
Motor Vehicle Inspector • 2025 • Paper-III (Mechanical Engineering)
A milling machine is used to perform:
A)
Drilling
B)
Boring
C)
Cutting flat surfaces
D)
Welding
Option C is correct: Cutting flat surfaces.
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)
The type of wheel which cannot be used with a tubeless tyre is:
A)
disc wheel
B)
wire wheel
C)
composite wheel
D)
light alloy wheel
Option B is correct: wire wheel.
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)
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.
