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

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

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

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