EASY PSC | Kerala PSC 066/2022 - Mechanic Answer Key And Cutoff.

Question 1

Which material is used for making a leg vice ?

A

Chilled cast iron

B

Mild steel

C

Stainless Steel

D

Grey cast Iron

Question 2

Which one of the following is not the other name of Jenny Calliper ?

A

Bent Leg Calliper

B

Odd Leg Calliper

C

Hermaphrodite Calliper

D

Leg and point calliper

Question 3

Select the right statement/ statements about knife edge file ?
i. It has the cross section of a sharp triangle
ii. It is used for filing narrow grooves above 10 degree.
iii. It is available only in single cut

A

i & iii only

B

ii & iii only

C

i & ii only

D

All the above (i, ii & iii)

Question 4

Which of the following is a direct angular measuring instrument ?

A

Bevel Gauge

B

Universal Bevel Gauge

C

Steel Rule

D

Bevel Protractor

Question 5

Which one is not a factor in the specification of Hack saw blades ?

A

Length

B

Pitch

C

Type of setting

D

Type of material

Question 6

Identify the wrong statement from the following about Hand reamers ?

A

They have a long taper lead

B

Shank has Morse taper

C

Held in tap wrench for reaming

D

Most of them have uneven spacing of teeth

Question 7

The natural abrasive used in the manufacture of grinding wheel is _______ ?

A

Emery

B

Aluminium Oxide

C

Silicon Carbide

D

Boron Carbide

Question 8

Which drilling machine is used for performing operations such as drilling, reaming and tapping many holes in a specific unit at one time ?

A

Pillar Drilling Machine

B

Gang Drilling Machine

C

Multi Spindle Head Drilling Machine

D

Radial Drilling Machine

Question 9

Identify the correct statement/statements from the following about counter sinking ?
i. It is used to deburr a hole after drilling.
ii. It is done to accommodate countersink rivet heads.
iii. A drilled hole can be enlarged by this process.
iv. It is helpful in chamfering the ends of a hole for thread cutting.

A

i, ii & iii Only

B

i, ii & iv Only

C

ii, iii & iv Only

D

All the above (i, ii, iii & iv)

Question 10

Guide plate is a part of _________ Die ?

A

Circular Split Die

B

Half die

C

Adjustable Screw Plate Die

D

Die Nut

Question 11

In an outside micrometer the datum line and graduations are marked on _______ ?

A

Thimble

B

Barrel

C

Spindle

D

Frame

Question 12

Which of the following statements are true about a Vernier Calliper ?
i. It is a precision measuring instrument.
ii. Fixed jaws of a Vernier Callipers are part of the Vernier slide.
iii. The main scale graduations are marked on the beam.

A

i & ii Only

B

ii & iii Only

C

i & iii Only

D

All the above (i, ii & iii)

Question 13

Which instrument is used with Vernier height gauge to check the location of a hole ?

A

Surface gauge

B

Inside micrometer

C

Dial indicator

D

Depth gauge

Question 14

Identify the correct statement/statements from the following about the advantages of using gauges ?
i. Faster checking of product
ii. Less dependence on operator skill
iii. Economical when compared to measuring instruments

A

i & ii Only

B

ii & iii Only

C

i & iii Only

D

All the above (i, ii & iii)

Question 15

Which surface finishing operation is done on the opposite measuring faces of slip gauge blocks to make it flat and parallel ?

A

Grinding

B

Lapping

C

Electroplating

D

Machining

Question 16

Pick out the wrong statement/statements about the purpose of holes drilled across the body of a sine bar ?
i. Reduce weight
ii. Facilitate clamping on angle plate
iii. Insert round pin for measuring

A

i & ii Only

B

All the above (i, ii & iii)

C

iii Only

D

i Only

Question 17

In the tolerance size, ‘20H7’, the number 7 denotes _______.

A

Grade of tolerance

B

Basic size

C

Fundamental deviation

D

Actual size

Question 18

Which key positions itself in the key way to accommodate the hub to have an easy assembling ?

A

Feather Key

B

Jib Key

C

Hollow Saddle Key

D

Woodruff Key

Question 19

Name the rivet used in light assembly, where riveting is done by hammering ?

A

Countersink head

B

Conical head

C

Pan head

D

Bifurcated

Question 20

_______ fixture is used for parts that require machining on evenly spaced surfaces ?

A

Indexing Fixture

B

Plate Fixture

C

Angle Plate Fixture

D

Vice jaw Fixture

Question 21

Identify the wrong statement/ statements about the refractory material “Dinas Bricks” ?
i. They are made from ground quartz
ii. They are also called quartz bricks.
iii. They can withstand sudden temperature changes.

A

i Only

B

iii Only

C

i & ii Only

D

All the above (i, ii & iii)

Question 22

Which of the following part of an anvil is used for bending and rounding operations ?

A

Beak

B

Face

C

Hardie Hole

D

Round Hole

Question 23

The forging operation in which, the length of a piece of metal is reduced and its cross sectional area is increased is known as _______ ?

A

Drawing out

B

Bending

C

Upsetting

D

Twisting

Question 24

The cutting angle of a straight snip is ______ degree.

A

89 Degree

B

67 Degree

C

87 Degree

D

90 Degree

Question 25

Which stake is used for turning up flanges on sheet metal disc ?

A

Half moon stake

B

Hatchet stake

C

Round bottom stake

D

Funnel stake

Question 26

Pick out the correct statement/statements about the process of hemming in sheet metal work ?
i. The edges are folded to 180 degree.
ii. It will make the edges sharp.
iii. The stiffness of the edges can be increased.

A

i & ii only

B

i & iii only

C

ii & iii only

D

All the above (i, ii & iii)

Question 27

What is the gas storage capacity of oxygen cylinder in oxyacetylene welding ?

A

5 m³

B

10 m³

C

7 m³

D

12 m³

Question 28

Which one of the gas flame combination used in gas welding has the lowest flame temperature ?

A

Oxy-acetylene

B

Oxy-hydrogen

C

Oxy-LPG

D

Oxy-coal gas

Question 29

Which of the following welding defect is the result of a very narrow edge preparation ?

A

Under cut

B

Porosity

C

Incomplete penetration

D

Slag inclusion

Question 30

Which of the following non destructive testing method for testing welded joints is suitable only for ferrous metals ?

A

Visual Test

B

Magnetic Test

C

Dye Penetrant Test

D

Radiographic Test

Question 31

In diesel cycle engine the combustion takes place at

A

Constant temperature

B

Constant volume

C

Constant pressure

D

Constant pressure & temperature

Question 32

The dwell angle on a three cylinder engine compared to four-cylinder engine is

A

More

B

Less

C

Same

D

May be more or less

Question 33

In a four stroke engine, in which of the following condition its stroke is increased ?

A

Connecting rod is lengthened

B

Piston is shortened

C

Crank throw increased

D

Crank throw decreased

Question 34

A four cylinder engine has a capacity of 2.8 Liters and its clearance volume in one cylinder is 100 cm³, what is its compression ratio ?

A

7:1

B

8:1

C

10:1

D

14:1

Question 35

The fluctuation of engine speed during cycle of operation depends upon

A

Power output

B

Speed of fly wheel

C

Mass of crank shaft

D

Mass of fly wheel

Question 36

The distance between axis of the piston pin and the top of the piston crown is called

A

Throw height

B

Compression height

C

Height of piston

D

Ring land height

Question 37

Which of the following is NOT a type of piston pin fastening method

A

Semi floating

B

Fully floating

C

Three quarter floating

D

Set screw type

Question 38

The piston skirt clearance at room temperature is about

A

0.008 mm

B

0.08 mm

C

0.40 mm

D

0.04 mm

Question 39

The cross sectional area of one cylinder of an engine is multiplied by its stroke is known as

A

Stroke volume

B

Piston displacement

C

Swept volume

D

All of these

Question 40

The maximum permissible ovality in an engine cylinder is usually

A

0.001 mm

B

0.01 mm

C

0.10 mm

D

0.05 mm

Question 41

What is the use of bourdon gauge ?

A

To measure volume

B

To measure pressure

C

To measure temperature

D

All of these

Question 42

Which of the following chemical substance are added to lubricating oil as anti-forming additives ?

A

Polyisobutane

B

Polyalyenyl succinimides

C

Polyorganosiloxanes

D

Thiophosphoric acid

Question 43

The bellows type thermostat valve fitted in cooling system is filled with ______.

A

Ethyl alcohol

B

Ethylene glycol

C

Glycerine

D

Ethyl

Question 44

Which of the following is NOT an example of anti freeze agent used in engine coolant ?

A

Ethylene glycol

B

Chloromethane

C

Ethyl alcohol

D

Calcium chloride

Question 45

The maximum permissible resistance to flow in an engine oil filter is about _________.

A

0.5 bar

B

1 bar

C

2 bars

D

4 bars

Question 46

The vacuum valve inside the radiator pressure cap is usually set to operate when the vacuum exceeds about

A

2 kPa

B

3 kPa

C

5 kPa

D

10 kPa

Question 47

When two metallic surfaces move over each other under direct contact the friction produced is called

A

Viscous friction

B

Direct friction

C

Boundary friction

D

Solid friction

Question 48

The minimum temperature at which oil gives off sufficient vapour to form combustible mixture with air is known as

A

Flash point

B

Fire point

C

Combustion point

D

Pour point

Question 49

Which lubrication system uses a separate oil tank ?

A

Wet sump lubrication

B

Splash lubrication

C

Petroil lubrication

D

Dry sump lubrication

Question 50

Which of the following is NOT a component of an air intake system ?

A

Turbo charger

B

Air Compressor

C

Inter cooler

D

Intake manifold

Question 51

In emission control technique EGR system controls which emission ?

A

Nitrous oxide

B

Carbon monoxide

C

Hydrocarbon

D

All of these

Question 52

The measurement of fuel delivered by each plunger with the control rod in a fixed position and its comparison is called _______.

A

Metering

B

Calibration

C

Phasing

D

Governing

Question 53

The opening pressure of hole type nozzles varies from

A

5-10 Mpa

B

13-26 MPa

C

17-34 Mpa

D

23-46 MPa

Question 54

Which type nozzle has an advantage of preventing deposit of carbon in the spray hole ?

A

Single hole type

B

Multi hole type

C

Long stem nozzle

D

Pintle type

Question 55

How much maximum pressure is developed by high pressure diesel pump in CRDI engine ?

A

2000 Kg/cm²

B

1600 Kg/cm²

C

1200 Kg/cm²

D

700 Kg/cm²

Question 56

In a diesel engine the duration between the time of injection and time of ignition is called ________

A

Injection lag

B

Ignition lag

C

Delay period

D

Period of injection

Question 57

How many fuel chambers are in HEUI ?

A

One

B

Two

C

Three

D

Four

Question 58

Which type of exhaust emission control requires Diesel exhaust fluid ?

A

EGR

B

EVAP

C

DPF

D

SCR

Question 59

How do we achieve near zero emission diesel engines ?

A

Combo of PCV and EGR

B

Combo of EGR and SCR

C

Combo of PCV and 3 way catalytic converter

D

Combo of DPF and EGR

Question 60

In three way catalytic converter which acts as reduction catalyst for NOx reduction ?

A

Palladium

B

Platinum

C

Rhodium

D

Cerium

Question 61

Clutch plate is located in between _______.

A

Flywheel and Gearbox

B

Engine and Gearbox

C

Flywheel and Pressure plate

D

Flywheel and Crankshaft

Question 62

On which system the slave cylinder is installed ?

A

Hydraulic brake

B

Hydraulic power steering

C

Clutch operation

D

Automatic transmission

Question 63

Which type of synchroniser unit is mostly used to engage the IV gear from III and vice versa ?

A

Baulk type

B

Baulk ring type

C

Multi and double cone type

D

Porche type

Question 64

On which device the lock up clutch mechanism is installed ?

A

Synchromesh gearbox

B

Fluid flywheel

C

Torque converter

D

Multi plate clutch

Question 65

______ of dual mass fly wheel isolate the fly wheel mass system of the engine.

A

Clutch

B

Vibration damper

C

Crank shaft

D

Primary flywheel

Question 66

In a Hotchkiss drive, the rear end driving torque is taken up by

A

Rear shock absorber

B

Rear Axle casing

C

Rear leaf spring

D

Rear Universal joint

Question 67

In a Differential unit, which part does not revolve when the vehicle is in straight drive ?

A

Planetery gear

B

Crown wheel

C

Cage unit

D

Pinion gear

Question 68

Which rear axle shaft support makes it possible to take off the axle shaft without removing the wheels ?

A

Semi floating axle

B

Full floating axle

C

Three quarter floating axle

D

Quarter floating axle

Question 69

Hooke’s joint uses _______ bearing to support the cross in the yoke.

A

Ball

B

Roller

C

Needle

D

Bush

Question 70

In a Torque converter, torque multiplication is achieved by __________.

A

Impeller

B

Stator

C

Freewheel Unit

D

Turbine

Question 71

The weight of vehicle components between the suspension and the road surface is called __________

A

Unsprung weight

B

Sprung weight

C

Vehicle weight

D

Axle weight

Question 72

The purpose of Shackle in a Suspension system is to __________.

A

Control side torque

B

Absorb road shock

C

Control rear torque

D

Allow spring length to change

Question 73

The tilt of the front wheel from the vertical is called __________.

A

Castor angle

B

Camber angle

C

King pin inclination

D

Toe - in

Question 74

Which type of steering gear is used in Maruti 800 cars ?

A

Worm and Sector type

B

Recirculating ball type

C

Rack and Pinion type

D

Worm and Roller type

Question 75

The ratio of Tyre section height and Tyre section width is known as __________.

A

Height ratio

B

Width ratio

C

Tyre ratio

D

Aspect ratio

Question 76

The bead of the tyre rest on the __________.

A

Wheel hub

B

Wheel Rim

C

Disc

D

Tyre shoulder

Question 77

On releasing the disc brake, which part act as a return spring and retracts the piston and the friction pads away from the disc ?

A

Callipers

B

Revolving Disc

C

Rubber Sealing ring

D

Pedal return spring

Question 78

The purpose of brake proportioning valves in the braking system is __________.

A

Increase braking force

B

Reduces brake pedal effort

C

Prevent leakage of fluid

D

Provide balanced braking

Question 79

In Air brake system, the brake pedal is connected to __________.

A

Unloader valve

B

Brake valve

C

System Protection valve

D

Brake chamber

Question 80

Which type of wheel cylinder helps to apply different pressure on each brake shoe ?

A

Single Piston wheel cylinder

B

Double piston with straight bore

C

Double Piston with step bore

D

Baffle type piston wheel cylinder

Question 81

__________ is the protective device layer over the insulated cable.

A

PVC insulation

B

Crimping

C

Circuit breaker

D

Shielding

Question 82

The ability to store energy in the form of electric charge is called __________.

A

Capacitance

B

Resistance

C

Electric Current

D

Inductance

Question 83

In fully charged condition, the active material of positive plate in a lead acid battery is __________

A

Spongy lead

B

Lead sulphate

C

Lead peroxide

D

Reel lead

Question 84

__________ is a device used to perform a specific gravity test.

A

Hygrometer

B

Hydrometer

C

Ammeter

D

Cell tester

Question 85

How many windings are provided in a solenoid switch ?

A

2

B

3

C

4

D

1

Question 86

Which device is used to maintain the constant voltage in an Alternator charging circuit ?

A

Rectifier assembly

B

Current regulator

C

Voltage regulator

D

Cut-out Relay

Question 87

Which device is used with slip rings and brushes ?

A

Alternator

B

Dynamo

C

Starting motor

D

Cut out relay

Question 88

Which bearing is mounted on the brush end housing of the Alternator ?

A

Ball bearing

B

Roller bearing

C

Needle bearing

D

Bush bearing

Question 89

If starter spins, but does not engage flywheel, what is the reason for this trouble ?

A

Loose or poor connection

B

Defective starter switch

C

Bendix pinion stuck on armature shaft

D

Defective brushes

Question 90

Which is the internal short circuit checking device of the Armature ?

A

Multimeter

B

Voltmeter

C

Ohm meter

D

Growler

Question 91

The operation performed to open up any land with a view to prepare seed bed for growing crops is known as ________.

A

Secondary tillage

B

Primary tillage

C

Zero tillage

D

Conservation tillage

Question 92

Which part of mould board plough invert the furrow slice to cover threshes ?

A

Mould board

B

Land side

C

Cross shaft

D

Plough bottom

Question 93

What is the purpose of hammer mill ?

A

Digging out ground nut

B

Removing the weed

C

Cutting straw or hay

D

Reduce the size of soiled materials

Question 94

Which of the following agriculture implement used for preparing seed bed in a single pass both in dry and wet land conditions ?

A

Harvester

B

Ditcher

C

Rotavator

D

Scraper

Question 95

Which agriculture implement combines stubble mulching and seed drilling into one machine ?

A

Hand seed drill

B

Happy seeder

C

Ditcher

D

Post hole digger

Question 96

Which tilling method can be applied to irregular field ?

A

Circular travel tilling method

B

Alternate tilling method

C

Return tilling method

D

All of the three

Question 97

The sprayers operated by IC engines or electric motors are called as ______.

A

Automizer

B

Power sprayer

C

Trailed type sprayer

D

All the three

Question 98

What are the two adjustments for proper functioning of reaper ?

A

Clearance & allowance

B

Alignment & clearance

C

Registration & allowance

D

Registration & alignment

Question 99

In combine harvester, the straw walkers are mounted on ______.

A

Camshaft

B

Crankshaft

C

Clutch shaft

D

Cutter bar

Question 100

What is the function of auger in the cutting system of combine harvester ?

A

Pull the cut crop to the middle of through

B

Carry the empty straw to the floor

C

Collect the chaff mixture

D

Takes the crop from cutter bar

066/2022 - Mechanic - Kerala Agro Machinery Corporation Ltd