MECHANIC DIESEL THEORY
SEMESTER - II JULY 2016
Morse test can be conductedfor ........
(a) Petrol engines
b) Diesel engines
c) Multi cylinder engines
d) All of these
Answer:- c) Multi cylinder engines
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Which of the following is a unit
of pressure?
a) Kg/cm²
b) gama
c) Pie
d) Newton
Answer:- a) Kg/cm²
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During the suction stroke of a
diesel engine ........
a) Petrol injected
b) Diesel injected
c) Diesel and air supplied
d) Only air supplied
Answer:- d) Only air supplied
In an automobile engine,
the temperature of piston will
be more at the ................
a) Piston pin
b) Skirt of piston
c) Crown of piston
d) Piston rings
Answer:- c) Crown of piston
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In the compression stroke
the piston moves from ........
a)T.D.C to B.D.C
b) B.D.C. to T.D.C
c) Below B.D.C.
d) Above T.D.C.
Answer:- b) B.D.C. to T.D.C
Piston slap in a cold engine is
due to ..........
a) Excessive ring gap
b) Excessive piston to bore clearance
c) Less piston working clearance
d) Excessive compression pressure
Answer:- b) Excessive piston to bore clearance
Heater plugs are used to warm up.......
a) Fuel pump
b) Feed pump
c) Injector
d) Combustion chamber
Answer:- d) Combustion chamber
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In one revolution of a 2-stroke
engine of crank shaft, the inlet
value opens ............
a) 1 Time
b) 2Times
c) 3 Times
d) 4 Times
Answer:- a) 1 Time
Piston is made of .................
a) Zinc Alloy
b) Aluminum Alloy
c)Copper Alloy
d) None of these
Answer:- b) Aluminum Alloy
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The knocking in the diesel engine occurs due to -
a) Ignition advance
b) Ignition delay
c) Ignition hold
d) None of these
Answer:- b) Ignition delayMECHANIC DIESEL THEORY
SEM -2 JAN18
A diesel engine has compression ratio from .......
a) 6 to 10
b) 10 to 15
c) 15 to 25
d) 25 to 40
Sulphur content in diesel oil should not be more than .......
a) 0.10%
b) 1%
c) 0.01%
d) 5%
In two stroke engine, the working cycle is completed in ......
a) One revolution of the crankshaft
b) Two revolutions of the crankshaft
c) Three revolutions of the crankshaft
d) Four revolutions of the crankshaft
Theoretically a four stroke cycle engine should develop ........... power as that of a two stroke cycle engine,
a) Half
b) Same
c) Double
d) Four times
The spring clamps pressure friction plate between pressure plate and ............ when clutch is engaged.
a) Flywheel
b) Differential
c) Reaction plate
d) Clutch paddle
A two stroke cycle engine gives ............. thermal efficiency than a four stroke cycle engine.
a) Higher
b) Lower
c) Same
d) None of these
In a four stroke cycle engine, the sequence of operation is ..........
a) Suction, Compression, Expansion and Exhaust
b) Suction, Expansion, Compression and Exhaust
c) Expansion, Compression, Suction and Exhaust
d) Compression, Expansion, Suction and Exhaust
Due to turbo charger, air intake in a engine ........
a) Decreases
b) Increases
c) Remains same
d) No change
In diesel engine the fuel is injected into the cylinder when the piston is .........
a) Exactly at T.D.C after exhaust stroke
b) Exactly at B.D.C before compression stroke
c) Nearing T.D.C during compression stroke
d) Approaching T.D.C during exhaust stroke
In S.I. engine, Sul. stands for .......
a) Straight Ignition
b) Standard Ignition
c) Spark Ignition
d) None of these
The oil pump is driven by the .....
a) Camshaft
b) Crankshaft directly
c) Camshaft via drive belt
d) Propeller shaft
The motion of the cam is transferred to the valve through ...........
a) Valve stems
b) Camshaft pulley
c) Rocker arms
d) Piston
The function of an alternator in an automobile is to .......
a) Continually recharge the battery
b) Partly convert engine power into electric power
c) Supply electric power
d) Convert mechanical energy into electrical energy
The firing order for an inline four Cylinder l.c engine is ........
a) 1-2-4-3 b) 1-3-4-2
c) 1-2-3-4 d) 1-3-2-4
The odometer is an instrument used for measurement of ........
a) Power
b) Fuel consumption
c) Engine rpm
d) Distance
The connecting rod lower end is connected to the relevant ........... of crankshaft.
a) Big end
b) Crank arm
c) Journal
d) Small end
The condition that results in large quantities of hydrocarbon emission is .........
a) High temperature combustion
b) Incomplete combustion
c) Low temperature combustion
d) High atmospheric temperature combustion
The diagram which shows the correct crank positions corresponding to the opening and closing of the valve is known as .............
a) Indicator diagram
b) Acid force diagram
c) Valve timing diagram
d) None of these
The starter motor is driven by ......
a) Clutch drive
b) Gear drive
c) Flat belt drive
d) V belt drive
The component in the radiator of an automobile that increases the boiling point of water is .......
a) Drain plug
b) Water jacket
c) Vacuum valve
d) Pressure cap
In a forced feed lubrication system the device used to guard against excessive oil pressure
is known as ..........
a) Release chamber
b) Balancer
c) Relief valve
The two kind of piston rings are ........
a) Compression rings and oil control rings
c) Oil control rings and oil scraper d) Stop valve
b) Compression rings and sliding seal rings
d) Pressure and sealingrings
The purpose of a thermostat in an engine cooling system is to .....
a) Prevent the cooling from boiling
b) Allow the engine to warm up quickly
c) Indicate the coolant temperature
d) Pressurise the system to raise the boiling point
A three way catalytic converter is used to.........
a) Re-circulate exhaust gases
b) Burn fuel vapour
c) Reduce nitrogen oxide, hydrocarbon and carbon di-oxide emission levels
d) Remove carbon di-oxide, hydrocarbon and nitrogen oxide from the exhaust gases passing through it
The information provided by the oxygen sensor to the feedback control system is about the .........
a) Air fuel ratio
b) Air temperature
c) Air flow speed
d) Exhaust gas volume
The starting system includes ......
a) A battery, a starter and an ignition switch
b) A battery, a distributor and an ignition switch
c) A battery, a starter and a distributor
d) A distributor, a starter and an ignition switch
The function of a connecting rod is .......
a) To turn the fly wheel
b) To drive the drive plate
c) To drive the fuel pump
d) To transmit motion of the piston to the crankshaft
The basic part of the engine to which the other engine p ts are attached or assembled is the .......
a) Cylinder head
b) Cranksh
c) Cylinder block
d) Oil pan
The cam shaft in an engine is always mounted ........
a) Parallel to the crankshaft
b) Perpendicular to the crankshaft
c) Inclined to the crankshaft
d) None of these
Which bearing is commonly used in the crankshaft of an automobile engine?
a) Ball bearing
b) Coller bearing
c) Taper roller bearing
d) Thin wall bearing
In a diesel engine, the function of a fuel injector is to ..........
a) Mix the fuel and air
b) Ignite the air- fuel mixture
c) Provide flame front for ignition
d) Spray atomized fuel in the cylinder
One effect of detonation is .....
a) Delay in ignition
b) Loss of power
c) Overheating of an engine
d) Overcooling of an engine
The engine oil is stored in ............. when the engine is not running.
a) Oil pan
b) Cylinder head
c) Oil pump
d) Separate oil tank
Which part does not rotate in the engine?
a) Piston
b) Crankshaft
c) Cylinder head
d) All of these
In the charging system of an Alternator, which of the following is used to convert AC to DC.
a) Slip rings
b) Diodes
c) Regulator
d) Starter
The condition that results in large quantities of carbon monoxide emission is ........
a) Insufficient air during combustion
b) Insufficient fuel during combustion
c) Low temperature combustion
d) High temperature combusting
In a car which of the following bulb will have the least wattage?
a) Head light bulb
b) Stop light bulb
c) Parking light bulb
d) Ignition warning bulb
The function of distributor in an automobile is to .......
a) Distribute charge equally to all the cylinder
b) Regulate power
c) Feed lub oil to all moving parts
d) Time the spark
In the opposed piston diesel engine, the combustion chamber is located ........
a) Above the piston
b) Below the piston
c) Between the piston
d) Anywhere
Which of the following is not a part of common rail diesel injection system?
a) Sensor
b) Injector
c) Air cleaner
d) Actuator
The knocking in diesel engines may be prevented by .........
a) Reducing the delay period
b) Raising the compression ratio
c) Increasing the inlet pressure of air
d) All of these
Which factor contributes to high fuel consumption?
a) Defect in Solenoid switch
b) Discharged batter
c) Clogged air cleaner
d) Weak pressure relief vavle
Lubrication oil consumption is high on a vehicle. Identify the cause ........
a) Breath filler removed
b) Battery is weak
c) Worn out piston rings
d) Alternator not charging
The least flash point of diesel is -
a) 50°F b) 75°F
c) 100°F d) 150°
The function of automobile catalytic converter is to control emission of -
a) Carbon dioxide and hydrogen
b) Carbon monoxide and hydrogen
c) Carbon monoxide and carbon dioxide
d) Carbon monoxide and nitrogen dioxide
The operation of forcing additional air under air pressure into the engine cylinder is known as ........
a) Supercharging
b) Carburation
c) Turbulence
d) Delay period
Injection pressure in a diesel engine is about ..........
a) 10 bar b) 100 bar
c) 150 bar d) 500 bar
The crank lubricated through .....
a) Cam shaft bearing
b) Main gallery
c) Drilled oil holes in man journal of crankshaft
d) Connecting rod big end holes
For charging two stroke diesel engines cylinder, one Of the following devices is used .........
a) Turbocharger
b) Roots blower
c) Ram charger
d) Compression gauge
Fuel pumps are generally mounted on ,........
a) F.I.P
b) Fuel filters
c) Fuel tank
d) Cylinder head
July17 MECHANIC (DIESEL) THEORY SEMESTER-II
In which working cycle is completed in four stroke engine?
a) One revolution of the crankshaft
b) Two revolution of the crankshaft
c) Three revolution of the crankshaft
d) Four revolution of the crankshaft
In which parts are to be joined between cylinder head and engine block?
a) Valve guide
b) Compressor ring
c) Combustion chamber
d) Head gasket
A two stroke cycle engine gives the number of power strokes as compared to the four stroke cycle engine at the same engine speed.
a) Half
b) Same
c) Double
d) Four times
A two stroke cycle engine gives mechanical efficiency than a four stroke cycle engine-
a) Higher
b) Inwer
c) Same
d) None of these
After fitting rings over piston, it is inserted in cylinder with the help of a special tool called-
a) Ring Expander
b) Ring cleaner
c) Ring compressor
d) Ring groove cleaner
Compression ratio of diesel engine is- -
a) The ratio of volumes of air in cylinder before compression stroke and after compression stroke
b) Volume displaced by piston per stroke and clearance volume in cylinder
c) Swept volume/Cylinder volume
d) Cylinder volume/Swept volume
The main function of intake manifold is
a) Reduce intake noise
b) Provide the mixture of air and fuel
c) Distribute intake air equally to the cylinder
d) Cools the intake air to a suitable temperature
The heat transfer from coolant to air in radiator of an automobile engine take place by-
a) Radiation only
b) Convention only
c) Convention & Radiation only
d) Conduction, Convention & Radiation
Water circulation in a radiator take place from
a) Lower tank to upper tank
b) Upper to lower tank
c) Engine to upper tank
d) Engine to water pump
Supercharger is the function of-
a) Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
b) Providing forced cooling air
c) Supplying compressed air to remove combustion products only
d) Injecting excess fuel for raising more load
In case of gas turbines, the gaseous fuel consumption guarantees are based on-
a) Low heat value
b) High heat value
c) Calorific value
d) Net calorific value
Engine pistons are usually made of aluminium alloy because it.
a) Is lighter
b) Warless
c) Absorb shocks
d) Does not react fuel & lubricant oil
Which is more viscous lubricant oil?
a) SAE 30
b) SAE 40
c) SAE 50
d) SAE 80
In the opposed piston diesel engine, the combustion chamber is located -
a) Above the piston
b) Below the piston
c) Between the piston
d) Anywhere
Piston rings are usually made of-
a) Cat iron
b) Cast steel
c) Aluminium
d) Brass
The forced fed lubrication system means that the oil is delivered to the engine by-
a) Gravity b) The pressure created by the oil pump
c) Splashing action of the crankshaft d) None of these
Exhaust pipes of engines are covered with insulating material in order to
a) Keep the exhaust pipes warm b) Increase engine efficiency
c) Reduce heat transfer to engine room
d) Conserve heat
Fuel consumption with increase in "back pressure" will-
a) Increase
b) Decrease
c) Depend on the factor
d) Remain unaffected
In which parts of battery charging rotates crank fan belt?
a) Water pump pulley
b) Dynamo
c) Self Starter
d) Magneto
In order to eliminate knocking in compression ignition engines, there should be-
a) Short delay period
b) Late auto - ignition
c) Low compression ratio
d) High self-ignition temperature of fuel
The most effective air cleaner in case of diesel engine is-
a) Dry type
b) Wet type
c) Whirl type
d) Oil bath type
Preferred location of an oil cooler is-
a) Before the filters
b) After the filters
c) Between the filters
d) Anywhere
High sulphur content in diesel oil used for diesel engines lead to-
a) Production of highly corrosive gases corroding the cylinder walls and exhaust system
b) Excessive engine wear
c) Damaging of both the storage tank and the engine
d) Reduction in thermal efficiency
The device used to reduce exhaust noise is called
a) Muffler
b) Exhaust pipe
c) Exhaust manifold
d) Tail pipe
The device for smoothing out the power impulses from the engine is called
a) Flywheel
b. Camshaft
c. Crankshaft
d. Clutch
Coolant temperature sensor is a thermostat or give information of temperature to
a) Fuel tank
b) Injection pump
c) E.C.M
d) Injector
Actually engine speed sensor indicates position of the
a) Camshaft
b) Crankshaft
c) Valve
d) Piston
Oxygen sensor is mounted on
a) Exhaust manifold
b) Intake manifold
c) Both a & b
d) None of these
Actuator is a type of sources.. .
a) Electro mechanic
b) Hydraulic
c) Only mechanical
d) Only chemical
In charging system - Alternator, which of the following is used to convert AC to DC in Alternator-
a) Slip rings
b) Diodes
c) Regulator
d) Starter
Clutch assembly are fitted with
a) Piston
b) Crankshaft
c) Gear box
d) Flywheel
Which method is used for oil supply to parts after filter?
a) Splash system
b) Full flow lubrication system
c) Splash cum pump method
d) Fly wheel splash method
If thermostat valve is closed, what will happen?
a) Engine do not run
b) Engine become hot gradually
c) Engine become vibrate.
d) Enginc bccomc very hot
Injection pressure in a diesel engine is about-
a) 10 bar
b) 100 bar
c) 150 bar
d) 500 bar
Which type of bearing is used for main bearing and connecting rod bearing?
a) Ball bearing
b) Needle roller bearing
c) Plain bearing
d) Taper roller bearing
Starter Motor, the engine crankshaft must be rotated at a speed of 100 rpm to start the engine. What is possible cause of the pinion disengages slowly after starting?
a) Weak battery
b) Over running clutch defective
c) Open in control circuit
d) Open circuit in commutator
The Firing order in an l.c Engine depend upon -
a) Arrangement of cylinder
b) Design of crankshaft
c) Noe of cylinder
d) All of these
Which component convert up & down motion in to rotary motion of piston is called
a) Camshaft
b) Crankshaft
c) Connecting rod
d) Piston rings
When air transmit to engine by turbo charger, what will happen?
a) Transmit exhaust gases
b) Transmit increased air pressure
c) Make Vacuum
d) Less air pressure
The impeller type exhauster has
a) One spindle
b) Two spindle
c) Three spindle
d) No spindle
The pressure of pump in common rail diesel injection system is
a) 10 to 10000 pound / square inch
b) 200 to 300 pound / squarc inch
c) 400 to 800 pound / square inch
d) 700 to pound / square inch
Which factor contribute to high fuel consumption?
a) Defect in Solenoid switch
b) Discharged battery
c) Clogged air cleaner-
d) Weak pressure relief valve
Lubrication oil consumption is high on a vehicle. Identify the cause
a) Breath filler removed
b) Battery is weak
c) Worn out piston rings
d) Alternator not charging
The ignition quality of diesel oil is expressed by-
a) Calorific value
b) Octane number
c) Cetane number
d) None of these
The thermal efficiency of diesel engine is about-
a) 15%
Which are following component used for oil pump run?
a. Crankshaft
b. Dammer pulley
c. Piston pin
d. Cam shaft
In engine specification it is given that cubic capacity is engine's
a) 'Lubricating oil capacity is 1.6 lit.
b) One cylinder total volume is 1.6 lit.
c) All cylinders sweep volume 1.6 lit.
d) Cooling water circulation per minute is 1.6 lit.
Cylinder head accommodates
a) Valves and injectors
b) Crankshaft
c) Cylinders liners
d) Connecting Rods
Tachometer in a vehicle measures-
a) Speed
b) Distance
c) Engine rpm
d) Fuel consumption
1.6 lit. it means the
The part which must be fitted in the piston to assure a good seal with cylinder wall is
a) Piston pins
b) Piston rings
c) Connecting rod
d) Gaskets
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