MECHANIC MOTOR VEHICLE THEORY SEM -2

MECHANIC MOTOR VEHICLE THEORY SEM -2

1. I.C engines are those engines where fuel is burnt .......
a) Inside the combustion chamber
b) Inside the induction manifold
c) Outside the combustion chamber
d) Inside the exhaust manifold

In a two stroke engine how many power stroke is / are available in two revoluüons of crank shaft ....
a) One b) Two c) Three d) Four

The sequence of four stroke cycle operation of I.C. engine is .......
 a) Induction — power — Compression — Exhaust
b) Induction — Compression — Power — Exhaust
c) Compression — Induction — Power — Exhaust
d) Compression — Exhaust — Power - Induction

The petrol engine is also known as .........
a) S.I. Engine
b) Steam Engine
c) C.I. Engine  
d) None of these

A square engine will have -
a) Bore > Stroke
b) Bore < Stroke
c) Bore = Stroke
d) Length of engine = Width of engine

The kilometers run by a vehicle is recorded by ......
a) Speedo meter
b) Odometer
c) Tachometer
d) Speed indicator

The volume of cylinder from TDC to BDC is called -
a) Stroke Volume
b) Clearance Volume
c) Overall Volume
d) None of these

T - Slot is provided in the piston ..........
a) For the passage of lubricating oil
b) For cooling purpose
c) To accommodate the expansion of piston when heated up
d) None of the above


The function of connecting rod is to .......
a) Transmit the piston motion to the crankshaft
b) Turn the flywheel
c) Turn the fuel pump
d) turn t.he drive plate

The basic part of the engine, to which the other engine parts are attached or assembled is called -
a) Cylinder b) Crank shaft c) Cylinder block d) Oil pan (sump)

In a 4 - stroke diesel engine the fuel is injected in to the combustion chamber at the end  of stroke.......
a) Suction  
c) Power
b) Compression
d) Exhaust

For a four stroke l.c. engine, how many times each inlet and exhaust valves opens and closes per minute if r.p.m. of 'the engine is 2000?
a) 1000 times
b) 2000 times
c) 3000 times
d) 4000 times

Generally the compression rati o of diesel engine is -  
a) 8 to 12 : 1
b) 12 to 15 : 1
c) 16 to 22 : 1
d) 23 to 30 : 1  

The relation among IHP, BHP and FHP is .......
a) IHP = FHP - BHP
b) IHP = BHP - FHP
c) IHP = BHP + FHP
d) BHP = 1HP + FHP

In diesel engine the fuel is  by .....
a) An electric spark
b) The hot exhaust
c)The heat of the compressed air
d) Igniter plug

The diesel fuel is rated by ......
a) Octane number
c)  Flash point
b) Cetane number
d) Fire point

When the gudgeon pin (piston pin) is free in piston bosses but locked with connecting rod   small end, the type of locking method of piston pin is called ...
a) Semi — floating
c) Free pin
b) Three quarter floating
d) Fully floating

Which types of cylinder liner outer surface have direct contact with liquid coolant or  water?
a) Dry liner
b) Wet liner  
c) Semi-dry liner
d) Semi-wet liner

Firing order of a 4 - cylinder engine is ......
a) 1-2-3-4  
b) 1-3-2-4
c) 1-3-4-2
d) 1-4-2-3

Which component is fitted to the diesel engine crank shaft at the opposite side of  flywheel for balancing?
a) Timing gears
b) Vibration damper
c) Rubber cushion
d) Pulley

Which tool is used to check the flatness of cylinder head?
a) Spirit level
b) Straight edge and feeler gauge
c) Micrometer
d) Vernier caliper

Sequence for tightening cylinder head mountings is ......
a) In any sequence
c) Diagonally from outer to centre
b) Diagonally from centre to outward
d) In zig zag way

The most widely used fuel supply system for car engine is .....
a) Gravity
b) Pressure system
c) Vacuum system
d) Pump system

Most commonly used water / liquid cooling system is ......
a) Thermo Syphon System
b) Impeller thermo syphon system
c) Pump Circulation System
d) Any of these

The opening temperature of thermostat valve fitted in liquid cooling system is -
a) 50 - 55°C
b) 55 - 60°C
c) 60 75°c
d) 75 80°C

The functions of Lubrication System is Automobile engine is / are ........
a) It reduces wear
b) It takes away heat and gives washing action
c) It seals piston ring with cylinder wall
d) All of these

One of the reason for misfiring of engine is .........
a) Restriction in Intake manifold
b) Engine over heated
c) More air intake
d) Restriction in exhaust manifold

In I.C. engine, the reason for low oil pressure is ......
a) Worn out main and big and bearing
b) Oil pump gear worn out
c) Chocked oil gallery or suction pipe
d) Any of these

Oil pressure relief valve is fitted to .........
a) Oil sump
b) Main oil gallery 
c) Oil pump
d) Oil strainer

For a given size of engine, the power output, with super charger is able to increase by ..........%
a) 20 - 30
b) 30 - 40
c) 40 - 50
d) 50 - 60

Paper type air filter is cleaned by ............
a) Kerosene
b) Diesel
c) Compressed air
d) water

Advantage of pintle nozzle over hole nozzle is ..........
a) It avoids deposition of carbon at spray hole
b) It provides better atomization
c) It provides spray of diesel at all angles
d) Less fuel consumption

The full form of CRDI is .........
a) Rail Direct' Injection
b) Common Rail Diesel Injection c) common Rate Diesel Injection
d) common Rate Direct Injection

The petrol engine exhaust gas contains excessive quantities of CO due to ...........
a) Insumcient air during combustion
b) Lean air fuel ratio
c) Low temperature combusüon
d) High temperature combusüon

Ignition warning lamp does not light even after switching on the iY1ition key, the  probable cause is ...........
a) Lamp bulb burnt out
b) Fuse blown off
c) Open circuit between lamp and Ignition switch
d) Any one of these

Which of the following is not the cause of "engine over heating"?
a) Lack of coolant
c) Defective water pump
b) Wheel wobble
d) Insufficient engine oil

"The engine is noisy" the probable cause is
a) Use of low octane fuel
b) Loose piston pin
c) Broken piston ring
d) Any one of these

In which type of engine LPG or CNG fuel can be used?
a) C.I. Engine
c) Any one of these
b) S.L Engine
d) None of these

Which of the following is multi grade oil?
a) SAE - 20
b) SAE - 40
c) SAE - 20W40
d) None of these

Which type of oil pump is generally fitted with heavy vehicle engine?
a) Gear type c) Electric type
b) Rotor type d) Diaphragm type

In dry sump lubrication system the engine oil is stored in ........
a) Oil sump of engine
b) A separate oil reservoir near engine oil sump (pan)
c) Oil storing is not required at all
d) None of these

To remove piston rings from ring grooves which tool is used?
a) Piston ring filer
b) Piston ring compressor
c) Piston ring expander
d) Screw driver

During bleeding operation of diesel fuel system, which pump is operated manually to   remove air from the fuel system?
a) Priming pump
b) Lift pump
c) Plunger pump
d) F.I.P.

Which of the following is not a component of starting circuit?
a) Battery
b) Ignition switch
c) Starter motor & solenoid
d) Regulator

Alternating current produced by alternator is converted to Direct current with the help of-
a) Transistor
b) Commutators
c) Rectifier
d) Condensers

When the charging system is fitted with alternator then which component is blocking the reverse flow of current from the battery?
a) Rectifier diodes
b) Cut out
c) Voltage regulator
d) Current regulator

Starter motor works on the principle of .......
a) Fleming's Right hand rule
c) Faraday's law of electrolysis
b) Fleming's left hand rule
d) Ohm's low

Most commonly, how many pole shoes are used in starter motor ..........
a) 2 b) 4 c) 6 d) 8

Loss of compression may cause ......
a) Excessive fuel consumption
c) Engine back fires
b) Noisy Engine


d) Smoky exhaust

No comments:

Post a Comment

July17 MECHANIC (DIESEL) THEORY SEMESTER-II

July17 MECHANIC (DIESEL) THEORY SEMESTER-II In which working cycle is completed in four stroke engine? a) One revolution of the cranksh...