‘Question63:-Mechanic A says some piston rings control blowby. Mechanics 8 says some piston rings control ol. Who is right ?
‘Ac Only Mechanic A
B:-Only Mechanic 8
೦-800 Mechanic A and 8
D-Neither Mechanic A nor B
Correct Answer: Option-C
Question64::Which one of the following is most commonly used Antifreeze solution 7
‘Ac Ethylene Glycol
B:-Mineral oil
C-Straight vegetable oil
Di-Lactic Acid
Correct Answer:- ೦೧000
ಟಟ one of the fo.... See more

Question63:-Mechanic A says some piston rings control blowby. Mechanics B says some piston rings control oil. Who is right ?
‘Ac Only Mechanic A
B:-Only Mechanic B
CeBoth Mechanic A and B
D-Neither Mechanic A nor B
Correct Answer:- Option-C
Question64::Which one of the following is most commonly used Antifreeze solution ?
‘Ac Ethylene Glycol
B:-Mineral oil
Straight vegetable oil
De-Lactic Acid
Correct Answer:- Option-é
Question65::Which one of.... See more

31.

32.

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34.

38.

36.

37.

38.

Thermostat valve helps the engine 00:
(ಗಿ) Keep the oil temperature at operating values
(B) Keep the coolant temperature at operating values
)0 Prevents the engine from overheating
(D) Both (B) and (C}

In a four stroke engine the cam shaft turns at:
(4) Same speed as the crank shaft
(ए) Double the speed as the crank shaft
‏تا‎ Half th.... See more

19.

20.

21.

22.

23.

24.

25.

26.

27.

For aiming the head lights, the distance between the head light and screen should be :
(A) 16m (B) 46m
(0 7.6m (D) 106m

The lamps are protected from overloading by :
(^) Fuse (B) Switch
(C) Capacitor (D) Harness

Distance travelled by the piston in moving from Top dead centre to Bottom dead centre is
called :

(^) Stroke ൯) Bore
(.... See more

D:-In the cylinder block

Correct Answer:- Option-B
Question58:-What is FGT?

A:-Fixed Geometry Turbochargers

B:-Forced Geometry Turbochargers

C:-Fixed Guide Turbochargers

D:-Forced Guide Turbochargers

Correct Answer:- Option-A

Question59:-Which part of the fuel reacts with other components in the atmosphere
to produce photo-chemical smog?

A:-Oxygen

B:-Carbon
C:-Hydrocarbon
D:-Hydrogen

Correct.... See more

24,

25.

26.

27.

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29,

30.

158/2016

The efficiency of diesel cycle is same as :
(4) Otto cycle (8) Stirling cycle
(0) മോല മിട (D) Ericsson cycle

For the same compression ratio and heat input, arrange the efficiencies of various cycles in

decreasing order :
(^) Otto, Dual, Diesel (8) വം, Diesel, Dual
(() Diesel, Otto, Dual (D) Dual, Diesel, Otto

t heat loss (8) Frict.... See more

10.

1L

12.

13.

The Diesel cycle consists of :

(ക Adiabatic compression ೨ Constant volume heat addition — Adiabatie expansion
—Constant volume heat rejection

(ए) Isothermal compression -» Constant volume heat addition — Isothermal
expansion — Constant volume heat rejection

(C) Adiabatic compression -» Constant pressure heat addition — Adiabatic
expangion —» Constant volume heat rejection

(D) I.... See more

74,

78.

76.

78.

79.

81.

82.

Mist lubrication is used in :
(4) two stroke petrol engine (8) two stroke diesel engine
(C) four stroke petrol engine (D) four stroke diesel engine

An internal snap ring is used :
(A) to lock suction valve spring (B) to lock main bearing
(C) tolock piston pin (D) to lock push rod

The purpose of catalytic converter is :
(ಗ) to improve fuel quality (B) to get complete .... See more

072/23

37.

38.

39.

40.

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42.

43.

44.

45.

EGR reduces the content of emission.

A) NO, content B) CO content

C) HC content D) H,0 content

In CRDI System high pressure pump develops pressure up to bar.
A) 200 to 2000 B) 10 to 2000

C) 1500 to 3500 D) 3500 to 5000

What is EDC ?

A) Electronic Diesel Control B) Eco Diesel Control

C) Economic Dies.... See more

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218/23

What is the name of pipe line from FIP to injector in a diesel fuel feed system ?
A) High pressure pipe B) Low pressure pipe
C) Delivery pipe D) Sution pipe

Why is there a vent hole provided either in filler neck or cap in an engine fuel tank ?
A) Not need for vent hole B) To maintain atmospheric pressure

C) To avoid overflow D) To maintain fuel temperature
See more

C:-Sution pipe
D:-High pressure pipe
Correct Answer:- Option-D

Question69:-How much pressure does the high pressure pump develop in a CRDI
engine?

A:-1000 - 2000 bar
B:-5000 - 6000 bar
C:-7000 - 8000 bar
D:-9000 - 12000 bar
Correct Answer:- Option-A

Question70:-What is the primary purpose of a Variable Intake Manifold system in a
Electronic Fuel Injection?

A:-To increase air-fuel ratio

B:-To enhance the volumetric effic.... See more

FINAL ANSWER KEY

Question Paper Code: 3/2023/0L
Category Code: 545/2019
Exam: Mechanic
Medium of Question: English
Date of Test 06-01-2023
Department Agriculture Development and Farmers Welfare
Alphacode A
Question1:-What is the working cycle of compression ignition engine?

A:-Otto Cycle

B:-Sterling Cycle

C:-Diesel Cycle

D:-Rankin Cycle
Correct Answer:- Option-C
Question2:-The portion below the piston pin boss is ca.... See more

175/2016

Maximum : 100 marks
Time : 1 hour and 15 minutes

1. During the compression stroke of a four stroke diesel engine, the piston compresses :

(A) Air fuel mixture (B) Atomised diesel
(C) Diesel Vapour (D) Air

2. The inventor of two stroke engine is :
^) Dugald Clark (B) Rudolf diesel
(0) James Watt (D) Nicolaug A Otto

8. Theoritically during expansion process in a four stroke engine :
(ಗ) Inlet valve opens and exhaust valve .... See more

16/2015

4.

Maximum : 100 marks

Time : 1 hour and 15 minutes

A thermodynamie system which allows transfer of energy and not allows transfer of mass 15

called :

ക്ര
(0)

Isolated system
Closed system

Unit of pressure in SI system :

ക്ര
(0)

Pascal (8) Kelvin
Newton (D) Bar

(13) Semi closed system
(D)) Open system

“If two thermodynamic systems A & B are in ther.... See more

23:

24.

26.

೩6.

27.

28.

The most economical foundation used when heavy structural loads from columns are
required to be transferred to a soil of low bearing capacity is :

(ಯ) Raft foundation (B) Stepped foundation
(C) Grillage foundation (10) Pile foundation

The basic principle of surveying is :
(A) working from whole to the part (ए) working from part ‏ما‎ whole
(£) Both (A) and (B) (D) Reconnais.... See more

16. If two pumps identical in all respects and each capable of delivering a discharge Q against a
head H are connected in series, the resulting discharge is :

(ಡಿ) 2Q against a head 2H (B) 2Q against a head H
(0) Q against a head 2H (D) Q against a head नि.

17. The power obtained from an impulse turbine is proportional to the number of nozzles used.
A pelton turbine with six nozzles has a specific speed of 8.1. The specific speed per nozzle is -See more

51.

52.

53.

54

55.

56.

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58.

59.

60.

A

In emission control technique EGR system controls which emission ?

(^) Nitrous oxide
(C) Hydrocarbon

(B) Carbon monoxide
(D) All of these

The measurement of fuel delivered by each plunger with the control rod in a fixed

position and its comparison is called
(A) Metering
(0) Phasing

(B) Calibration<.... See more

18.

19.

20.

21.

22.

23.

24.

For the same compression ratio and heat input, the cycles in decreasing order of thermal
efficiencies are :

(A) Otto, dual, diesel (B) Diesel, otto, dual
(C) Dual, diesel, otto (D) Otto, diesel, dual

Tf each fission of Uranium 235 releases 200 MeV, how many fissions occur per second to
produce a power of 1 77

(A) 312x 10'*/sec (B) 31.2 x 10'%/sec
(0) 3.12 x 10'%/s.... See more

83.

84.

85.

86.

87.

88.

Which of the following is an inversion of single slider crank chain?
(A) Beam engine
(B) Oscillation cylinder engine
(C) Watts indicator mechanism
(D) Elliptical trammel

The circle drawn to the cam profile with minimum radius is called the :
(^) Prime circle (B) Cam circle

(C) Pitch circle ) circle

If the axes of first and last gear of a compound gear train are coaxial the.... See more

83. Which of the following chemicals are the ingredients of the mixture used for comparing the
ignition quality (knocking tendency) of S.I Engines fuels?

൫ Iso-Octane.

@) @-methyl naphthalene.

(17) n-heptane.

(iv) hepta-methyl nonane.
(A) @ and (iv) (B) (ii) and (iii)
(C) 61) ೩೫4 69 ൯൬) (0 ೩೧6 (10)

84. What is the effect of short ignition delay, in knocking tendency of 4 stroke I.C. Engines?
(A) Reduces the knocking tende.... See more

Correct Answer:- Option-B
Question72:-In a SI engine which statement is not correct about normal combustion
A:-Strong pressure pulsations are not observed
B:-Spark is given before TDC
C:-In the ignition lag phase a self propagating nucleus of flame is formed

D:-At the completion of the after burning phase cylinder pressure reaches its
maximum

Correct Answer:- Option-D
Question73:-About diesel knock in Cl Engines which statement is incorrect
A:-Diesel.... See more

Correct Answer:- Option-B

Question85:-Which of the following part is not an internal part of engine?

A:-Piston

B:-Flywheel

C:-Crank shaft

D:-Cam shaft

Correct Answer:- Option-B

Question86:-Premium type gasoline fuel having

A:-Octare number - 87
B:-Octare number - 93
C:-Cetane number - 87
D:-Cetane number - n 93
Correct Answer:- Option-B

Question87:-CRDI stands for

A:-Constant Rail Diesel Inj.... See more

59.

61.

64,

In diesel engine, the fuel is ignited by :
(ಗಿ) the heat of compressed hot air (8)
(£) the hot exhaust gas (D)

Aluminium cylinder blocks require :

(ಗಿ) cast iron liners ‏رك‎
‎(0 aluminium liners ത
Wheel base of a vehicle is the :

(A) distance between the front tyres

(18) distance between the front and rear axles
(C) total length of the vehicle

(D) none of the above

.... See more

47,

49.

506.

51.

52.

58.

54.

58.

The C.I. engine pistons are generally made ज

(A) Aluminium alloy (B) Stainless steel
() Copper 10) வண

White metal is an alloy used in diesel engines to manufacture :
(ക) Connecting rod bolts (B) Exhaust valve
{C) Main bearing (D) Engine body

Cylinder liners are subjected to extreme heat of combustion and it has to permit the piston
and piston.... See more

80/2015

e

Maximum : 100 marks
Time : 1 hour and 15 minutes

When a cylinder is twisted, the ‘internal couple of forces developed within it due 0 elasticity

18 called :

(A) elastic couple 18) twisting couple

(C) torsional couple (12) none of these

In a diesel engine the warking substance is :
(^) Mixture of diesel vapour and air (13) Diesel vapour
യ ‏چتھ‎ (D} Petrol

When a charged particle moves through .... See more