MECHANIC MOTOR VEHICLE
(THEORY)
SEMESTER – II
JULY 2018
Which of the following is not
true for internal combustion
engine as compare to external
combustion engine?
a. It has lower ratio of weight
to output
b. They are self-starting
c. Higher overall efficiency
d. Mechanical simplicity
Answer : b. They are
self-starting
Which of the following is not an
internal Combustion (IC) engine?
a. Gas engine
b. Wankel engine
c. Jet engine
d. Sterling engine
Answer : d. Sterling engine
In two stroke engine there is one
power stroke in_of crankshaft rotation.
a. 90°
b. 180°
c. 270°
d. 360°
Answer : d. 360°
In four stroke engine which of
the following is also known as power stroke-
a. Suction stroke
b. Compression stroke
c. Expansion stroke
d. Exhaust stroke
Answer : c. Expansion stroke
Thermal stress in cylinder liners
can be reduced by……..
a. Increasing the wall thickness
of cylinder liner
b. Increasing velocity of flowing
water through jacket
c. Both(a)&(b)
d. None of the above
Answer : b. Increasing velocity
of flowing water through jacket
Exhaust valve diameter is_intake
valve.
a. Greater than
b. Same as
c. Smaller to
d. Double to
Answer : c. Smaller to
Piston slap results from
excessive clearance berween ….
a. Piston and cylinder wall
b. Piston and piston pin
c. Piston and piston
d. Piston rings
Answer : a. Piston and cylinder
wall
The connecting rod attaches the
piston to. The ……
a. Cylinder head
b. Crankshaft
c. Camshaft
d. Driveshaft
Answer : b. Crankshaft
Piston rings are made of-
a. Cast iron
b. Brass
c. Copper
d. Both (a) & (b)
Answer : a. Cast iron
On which two strokes are both
valves closed?
a. Intake and exhaust
b. Intake and compression
c. Compression and power
d. Power and exhaust
Answer : c. Compression and power
What is the material of the
connecting rod-
a. Mild steel .
b. Forged steel
c. Tool steel
d. Cast iron
Answer : b. Forged steel
Fly wheel is installed on -
a. Crank shaft
b. Cam shaft
c. Both (a) & (b)
d. None of these
Answer : a. Crank shaft
Hydrocarbons are decomposed into
smaller hydrocarbons by ….
a. Reforming
b. Refining
c. Cracking
d. Polymerization
Answer : c. Cracking
Which of the following isn't a
cylinder block part?
a. Cylinder in which piston
slides up and down
b. Openings for valves
c. Passages for flow of cooling
water
d. Carburettor
Answer : d. Carburettor
A machine member used to connect
engine shaft to gear box is called
a. Differential
b. Clutch
c. Flywheel
d. Propeller shaft
Answer : b. Clutch
A gas turbine works on which
cycle?
a. Carnot. .
..
b. Brayton
c. Dual cycle
d. Rankine cycle
Answer : b. Brayton
Which among these is the main
component of a gas turbine plant?
a. Condenser
b. Compressor
c. Boiler
d. Both (b) & (c)
Answer : b. Compressor
The gasoline engine works on
which cycle?
a. Otto cycle
b. Diesel cycle
c. Brayton cycle
d. None of these
Answer : a. Otto cycle
The turbocharged diesel'ehgine
requires ……….. cooling air
than naturally aspired diesel
engines.
a. Less
b. More
c. Equal
d. None of these
Answer : b. More
Which of the following is true in
radiator …………
a. Relatively small amount of
water are brought into
contact with large surface areas
of metal
b. Relatively large amount of
water are brought into
contact with small surface areas
ot metal
c. Equal amount of water are
brought into contact
with equal surface areas ot metal
d. Anv of the above
Answer : a
A typical cooling system circuit
has the thermostat between …..
a. Engine outlet and radiator
b. Radiator outlet and engine
inlet
c. Both (a) & (b)
d. None of these
Answer : a. Engine outlet and
radiator
Lubricating oil ………..
a. Minimizes wear in moving
parts
b. Helps in keeping the parts
cool .
c. Washes away and carries away
d. All of these
Answer : d. All of these
Viscosity index (VI) is a measure
for the change of
viscosity with change in ………
a. Temperature
b. Pressure
c. Volume
d. All of these
Answer : a. Temperature
The following part is not lubricated
by Pressure feed system …..
a. Timing gears
b. Valve rods and Push rods
c. Rocker arms
d. Main bearings of crankshaft
Answer : b. Valve rods and Push
rods
Supercharging -
a. Increases intake pressure
b. Increases intake temperature
c. Increases flame speed
d. All of these
Answer : d. All of these
Turbochargers are generally-
a. Centrifugal compressors
c. Vane blowers
b. Reciprocating compressors
d. Roots blower
Answer : a. Centrifugal
compressors
In which of the following
compressors,
a slip coupling is used between
the engine
and compressor for the variable
speed
operations of the engines?
a. Piston cylinder type
b
Root blower
c. Vane type blower
d. Centrifugal compressor
d. Centrifugal compressor
If the temperature of intake air in I.C. engine
is
lowered, then its efficiency will
………..
a. Increase
b. Decrease
c
Remain same
d. No effect
Answer : a. Increase
Air fuel ratio for idling speed
of a petrol engine is approximately …
a. 1:1
b. 5:1
c. 10:1
d. 15:1
Answer : c. 10:1
A muffler between the exhaust
manifold and
the end of the exhaust pipe causes …………..
a. A decrease in exhaust gas
pressure
b. An increase in exhaust gas
pressure
c. No change in exhaust gas
pressure
d. Either (a) or (b) .
Answer : b. An increase in
exhaust gas pressure
The air fuel ratio of the petrol
engine is controlled by ……….
a. Fuel pump
b. Governor
c. Injector
d. Carburettor
Answer : d. Carburettor
In a diesei engine, the fuel is
ignited by-
a. Spark
b. Injected fuel
c. Heat resulting from
compressing air that is supplied for combustion
d. Ignition
Answer : c
ECU enabled electronic injection
system is used for -
a. Calculating the appropriate
injection timing
b. Meeting only certain operating
conditions
c. Closing the injection valve
only
d. None of the above
Answer : . None of the above
Scavenging air in diesel engine
means -
a. Air used for combustion sent
under pressure
b. Forced air for cooling
cylinder
c. Burnt air containing products
of combustion
d. Air used for forcing burnt
gases out of engines
cylinder during the exhaust
period
Answer : d
Fuel is injected in a four-stroke
CI engine-
a. At the end of suction stroke
b. At the end of expansion stroke
c. At the end of compression
stroke
d. At the end of exhaust stroke
Answer : c. At the end of
compression stroke
……….. of fuel is independent of cranking
speed and
therefore starting will be
easier,
a. Ignition
a. Ignition
b. Atomization
c. Condensation
d. None of these
Answer : b. Atomization
When the engine is cold, the ………….. plate
will be in closed position.
a. Nozzle
b. Throttle
c. Air
d. None of these
Answer : b. Throttle
Fugitive emissions consist of-
a. Street dust
b. Dust from construction
activities
c. Dust from farm cultivation
d. All of these
Answer : d. All of these
The function of automobile
catalytic converter is to
control emissions of-
a. Carbon dioxide and hydrogen
b. Carbon monoxide and hydrogen
c. Carbon monoxide and carbon
dioxide
d. Carbon monoxide and nitrogen
dioxide
Answer : d . Carbon monoxide and nitrogen dioxide
Gaseous pollutants include-
a. Biological decay
b. Forest fires
c. Volcanic eruptions
d. All of these
Answer : d. All of these
An alternator is also called ……….
a. Synchronous generator
b. Turbo generator
c. Asynchronous generator
d. Generator
Answer : a. Synchronous generator
To get a maximum output current,
IC regulation
are provided with
a. Radiation source
b. Heat sink
c. peak detector
d.
None of these
Answer : b. Heat sink
3 - point starter is used to
start the ……..
a. Series motor
b. Shunt motor
c. Compound motor d.
only (b)and (c)
Answer : d.
only (b)and (c)
The full form of MPF1 is ……….
a. Multi Point Fuel Injection
b. Multi Piston Fuel Injection
a. Multi Point Fuel Injection
b. Multi Piston Fuel Injection
c. Main Point Fuel Injection
d. Multi Point Fuel Ignition
Answer : a. Multi Point Fuel Injection
EGR stands for -
a. Exhaust Gas Recirculation
b. Engine Gas Recirculation
c. Engine Gas Recycling
d. Exhaust Gas Re-injection
Answer : a. Exhaust Gas
Recirculation
To prevent overload and
overheating of wires-
a. Fuses are used only
b. Circuit breakers are used only
c. Fuses and circuit breakers are
used
d. Fuses and resistor are used
Answer : c. Fuses and circuit
breakers are used
The effects of knocking are ……..
a. Noise and roughness
b. Mechanical damage .
c. Carbon deposits
d Allot these
Answer: a. Noise and roughness
A hydraulic coupling belongs to
the category of ………
a. Power absorbing machines
b. Energy transfer machines
c. Power developing machines
d. Energy generating machines
Answer: d. Energy generating
machines
In water cooling, the water in
the jackets obtains heat from the.
Cylinders due to-
a. Conduction
a. Conduction
b. Convection
c. Radiation d.
All of these
Answer: a. Conduction
Which of the following is the
most abundant hydrocarbon
which is emitted into the atmosphere
by biological activity?
a. Ethane
b. Methane
c. Poly Aromatic hydrocarbons
d. Pentane
Answer: b. Methane
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