EASY PSC | Kerala PSC 011/2022 - Operator Grade III Answer Key

Question 1

An Oily Floor Should be cleaned by?

A

Cotton Waste

B

Putting Water

C

Putting Sawdust

D

Spraying Carbon dioxide

Question 2

What are the three factors causes Fire?

A

Fuel, Light, Oxygen

B

Fuel, Nitrogen, Oxygen

C

Heat, Nitrogen , Hydrogen

D

Fuel, Heat, Oxygen

Question 3

While Grinding operation are to be carried out, Operator must wear?

A

Mask

B

Safety Goggles

C

Dark Glass screen

D

Apron

Question 4

Colour code of Bins used in Workshop for segregation Paper is :

A

Blue

B

Yellow

C

Green

D

Red

Question 5

What is the Class of Fire caused by Wood, Paper, Cloth?

A

Class "B" FIRE

B

Class "D" FIRE

C

Class "A" FIRE

D

Class "C" FIRE

Question 6

Flammable liquid fire occurs, Which type Fire Extinguishers are most suitable :

A

Water Filled Extinguishers

B

Form type Extinguishers

C

Carbon Dioxide type Extinguishers

D

Dry Powder type Extinguishers

Question 7

What "A" denotes in ABC of FIRST AID?

A

Attention

B

Anxiety

C

Air way

D

Alert

Question 8

In Method of Waste Disposal, the Process involves breaking down the materials into organic compounds that can be used as manure is :

A

Composing

B

Land filling

C

Recycling

D

Burning Waste Material

Question 9

In Industry which one is not used for shifting/moving Heavy Equipment :

A

Crane and slings

B

Winches

C

Conveyors

D

Layers and roller

Question 10

The word means freedom or protection from harm, danger, hazard, risk, accident, injury or Damage is :

A

Accident

B

House keeping

C

Guideline

D

Safety

Question 11

The basic unit of Length in SI System is :

A

Metre

B

Centimetre

C

Millimetre

D

Inches

Question 12

1 µ means how much Millimetre :

A

0.1 mm

B

0.01 mm

C

0.0001 mm

D

0.001 mm

Question 13

Scribers are made out of which Material :

A

Tool Steel

B

High Carbon steel

C

High Speed Steel

D

Spring Steel

Question 14

The angle of the prick punch which is used for making light punch marks needed to position dividers are?

A

90 degree

B

120 degree

C

30 degree

D

60 degree

Question 15

Which precision measuring instrument is used for checking and setting of angles?

A

Bevel Protractor

B

Combination set

C

Angle Gauge

D

Sine bar

Question 16

The Vernier bevel protractor is a precision instrument meant for measuring angles to an accuracy of :

A

5 minutes

B

30 second

C

5 second

D

0.5 minutes

Question 17

The Name of the part of Vernier Height gauge, in which the main scales are graduated and various attachments may be clamped :

A

Base

B

Main Slide

C

Beam

D

Finer adjusting slider

Question 18

In industry/Workshop which grade Slip Gauge is used for inspection purposes?

A

Grade "0" accuracy

B

Grade "00' accuracy

C

Grade I accuracy

D

Grade II accuracy

Question 19

For Corrosion Protection and maintain surface fish clean the slips with carbon tetrachloride and apply :

A

Grease

B

Linen clothe

C

Petroleum Jelly

D

Oil

Question 20

The least count of Micrometer is :

A

0.0001 mm

B

0.01 mm

C

0.002 mm

D

0.02 mm

Question 21

Files are generally used for metal removing purpose, Which of the following statement is/are true about the constructional features of a Hand File :
I. It is rectangular in cross section
II. Its edges are parallel around 66% of its length
III. One edge is uncut
IV. One face is uncut

A

I and II

B

II and III

C

I and III

D

II and IV

Question 22

Which one of the following hammer is used for nail pulling action?

A

Sledge Hammer

B

Claw Hammer

C

Ball peen Hammer

D

Planishing Hammer

Question 23

Which one of the fallowing file is used for removing metal from a V shaped groove with an included angle of 50 degree?

A

Triangular File

B

Flat File

C

Hand File

D

Knife edge File

Question 24

Flute is the part of a drill bit, Which of the following statement is/are correct about flutes :
I. Flutes helps to form the cutting edges
II. Flutes helps for chip removal process
III. Flutes helps for coolant flow
IV. Flutes Helps for improving strength of drill

A

II and III

B

III and IV

C

I, II and III

D

II, III and IV

Question 25

Which one of the material is generally used for making surface plates?

A

Grey cast iron

B

White cast iron

C

Mild steel

D

Alloy steel

Question 26

What is the Use of a Die Nut (Solid Die)?

A

For Cutting Internal Thread

B

For Cutting External Thread

C

For cutting Threads in Nuts only

D

For Reconditioning Damaged threads

Question 27

Which one of the following is a commercially available marking media with various colours and quick dry action?

A

Cellulose lacquer

B

White wash

C

Copper sulphate

D

Prussian Blue

Question 28

Vices are used for holding workpieces for various operations, which of the following Vice has only a Line contact occurs between work and jaw plate instead of surface contact?

A

Bench Vice

B

Leg Vice

C

Tool makers Vice

D

Parallel jaw vice

Question 29

Which type of limit gauge is suitable for checking the width of a rectangular prism?

A

Plug gauge

B

Ring gauge

C

Progressive plug gauge

D

Snap gauge

Question 30

Eye hole is part of hammer, What is the shape of an Eye hole?

A

It is a round straight hole

B

It is an oval shaped straight hole

C

It is a round tapered hole with an increase in diameter from centre towards its ends

D

It is an oval shaped tapered hole with an increase in diameter from centre towards its ends

Question 31

Which one of the following metal has the lowest melting point?

A

High carbon steel

B

Medium carbon steel

C

Low carbon steel

D

Tungsten

Question 32

Which one of the following is a property of metal which fails under the action of constant tensile load at elevated temperature?

A

Fatigue

B

Brittleness

C

Elasticity

D

Creep

Question 33

Which one of the following furnace is used for making Cast iron?

A

Cupola Furnace

B

Blast Furnace

C

Puddling Furnace

D

Open hearth furnace

Question 34

Annealing is a Heat treatment process, In annealing what is the heating range of steel having 0.9% Carbon :

A

50 Degree below LCT

B

50 Degree above LCT

C

50 Degree above UCT

D

50 Degree below UCT

Question 35

In arc welding process, which one of the following statement is true in case of straight polarity?

A

66% Heat is generated in work

B

66% Heat is generated in electrode

C

Equal amount of heat is generated in electrode and work

D

100% Heat is generated in work

Question 36

In Fillet weld nomenclature, What you mean by throat thickness?

A

It is the distance between root of weld to the toe

B

It is the distance between root of weld to the line joining two toes

C

It is the distance between two toes

D

It is the thickness of the base metal

Question 37

Which one of the following rivet is used where the projection of the rivet head above the assembly surface must be avoided?

A

Snap head rivet

B

Flat head rivet

C

Countersunk head rivet

D

Pan head rivet

Question 38

Which one of the following power source is used in arc welding where electricity is not available?

A

Generator set

B

Transformer set

C

Rectifier set

D

Inverter Set

Question 39

Which one of the following Heat treatment process is used for removing internal stresses developed due to uneven heating and cooling of metal?

A

Annealing

B

Hardening

C

Tempering

D

Normalising

Question 40

Which one of the following gas is used for Gas nitriding process?

A

Ammonia

B

Nitrogen

C

Oxygen

D

Argon

Question 41

Engines having spark ignition are governed by :

A

Hit and Miss Governing

B

Quantitative Governing

C

Qualitative Governing

D

Both (B) and (C)

Question 42

In a four stroke engine the working cycle is completed by —————— revolutions of crank shaft :

A

1

B

2

C

4

D

3

Question 43

The combustion process in a diesel engine is :

A

Constant Volume Process

B

Constant Temperature Process

C

Adiabatic Process

D

Constant Pressure Process

Question 44

What is the material used for making cam shaft?

A

Copper Alloy

B

Aluminium Alloy

C

Forged Alloy Steel

D

Zinc Alloy

Question 45

Piston and connecting rod joined by using :

A

Cam shaft

B

King Pin

C

Gudgeon Pin

D

Rocket arm

Question 46

What is the working principle of clutch?

A

Sliding

B

Centripetal

C

Screw and Nut

D

Friction

Question 47

What is the purpose of throttle valve in the carburettor?

A

Control air fuel mixture into engine

B

Excess supply of fuel at idle

C

Fitter the fuel

D

Always hold the correct fuel

Question 48

Which one of the following is the working cycle of Compression Ignition Engine?

A

Diesel Cycle

B

Otto Cycle

C

Sterling Cycle

D

Rankine Cycle

Question 49

What is the compression ratio of petrol engine?

A

10 : 1 to 18 : 1

B

8 : 1 to 15 : 1

C

6 : 1 to 11 : 1

D

15 : 1 to 20 : 1

Question 50

Fresh charge in the cylinder of a two stroke engine enters in cylinder by :

A

Exhaust Port

B

Transfer Port

C

Inlet Port

D

Inlet Valve

Question 51

Type of drive best suited for minimum distance and for maximum power Transmission is :

A

Gear drive

B

Belt drive

C

Rope drive

D

Chain drive

Question 52

A key fits into a semi circular key way cut in the shaft is :

A

Gib headed key

B

Feather key

C

Woodruff key

D

Sunk key

Question 53

Gears used to transmit power at right angles is :

A

Spur Gear

B

Helical Gear

C

Hynoid Gear

D

Mitre Gear

Question 54

Example of an anti-friction bearing is :

A

Journal Bearing

B

Ball Bearing

C

Plummer Block

D

Pivot Bearing

Question 55

Which of the following is an example for pin joint?

A

Knuckle joint

B

Socket and Spigot joint

C

Cotter joint

D

Expansion joint

Question 56

If the bearing pressure (load) is parallel to the axis of the shaft the Bearing is called :

A

Journal Bearing

B

Pedestal Bearing

C

Plummer Block

D

Pivot Bearing

Question 57

Driver and Driven Pulley rotates in opposite direction in :

A

Open Belt drive

B

Cross Belt Drive

C

Quarter twist drive

D

Jockey Pulley Drive

Question 58

Bronze is an alloy of :

A

Copper and Zinc

B

Copper and Nickel

C

Copper and Tin

D

Copper and Lead

Question 59

The surface above the pitch circle diameter of a gear is called :

A

Face

B

Roof

C

Depth

D

Pitch

Question 60

The mechanism used in lathe for the movement of carriage is :

A

Worm and Worm Wheel

B

Bevel Gear

C

Rack and Pinion

D

Helical Gear

Question 61

Which one of the following is an example of Drive fit?

A

H7j6

B

H7r6

C

H7f6

D

H7d8

Question 62

The algebraic difference between a size to its corresponding basic size is known as :

A

Tolerance

B

Limit

C

Deviation

D

Fit

Question 63

The axial advancement of a nut on a bolt in one complete revolution is called :

A

Pitch

B

Lead

C

Slope

D

Depth

Question 64

The angle of seller"s thread is :

A

55°

B

29°

C

47.5°

D

60°

Question 65

The combination of right hand and left hand thread is utilised in —————— of the following :

A

Stud

B

Turn Buckle

C

Knuckle joint

D

Wing Nut

Question 66

If the tolerance zones of mating parts overlaps the fit obtained is :

A

Clearance

B

Interference

C

Transition

D

Shrink

Question 67

A shaft of basic size 40 mm has its upper and lower deviations of 0.025 mm. Calculate the tolerance :

A

0.05

B

0.005

C

0.5

D

0.025

Question 68

In a triple start thread the lead equals :

A

three times of the pitch

B

one third of the pitch

C

two third of the pitch

D

double of the pitch

Question 69

The maximum and minimum sizes of shaft are 35.047 & 35.036 and that of Hole are 35.022 & 35.000 respectively. Calculate the minimum and maximum interferences when they are assembled :

A

0.011 & 0.047

B

0.014 & 0.047

C

0.025 & 0.036

D

0.011 & 0.022

Question 70

As per IS : 919–1963 (revised) BIS recommends —————— types of fundamental deviations and —————— grades of tolerances for basic size upto 500 mm :

A

27 & 16

B

18 & 26

C

25 & 18

D

27 & 18

Question 71

Electron has a ––––––––––– electric charge :

A

Positive

B

Negative

C

No charge

D

None of the above

Question 72

Unit of electric charge is :

A

Coulomb

B

Watts

C

Ampere

D

Volt

Question 73

Unit of conductance :

A

Ohm

B

Mho

C

Ampere

D

No unit

Question 74

Which one is semiconductor material?

A

Eureka

B

Ebonite

C

Copper

D

Germanium

Question 75

How many electrons are there in the third cell of the copper atom?

A

2

B

1

C

18

D

29

Question 76

Full form of EMF is :

A

Electro Magnetic Force

B

Electro Motive Force

C

Electro Mechanical Force

D

Electric Magnitude Force

Question 77

RMS value =

A

Vmax/0.707

B

Vmax X 0.707

C

2 X Peak value

D

Half of peak value

Question 78

Copper is a/an :

A

Good conductor

B

alloy

C

Semiconductor

D

Insulator

Question 79

An instrument which detect electric current is known as :

A

Volt meter

B

Rheostat

C

Watt meter

D

Galvanometer

Question 80

Electric pressure is also called :

A

Resistance

B

Power

C

Voltage

D

Energy

Question 81

Calculate the total power of the circuit of two lamps rated as 200 W/240 V are connected in series across 240V supply :

A

50 W

B

100 W

C

200 W

D

400 W

Question 82

Which law states that in closed electric circuit, the applied voltage is equal to the sum of the voltage drops?

A

Ohm"s law

B

Laws of resistance

C

Kirchhoff"s first law

D

Kirchhoff"s second law

Question 83

What is the effect of the parallel circuit with one branch opened?

A

Current will remain same

B

Whole current will not function

C

No current will flow in that branch

D

Voltage drop increase in the opened branch

Question 84

The total resistance in a series circuit is equal to the ––––––––––– of the individual resistances around the series circuit :

A

Sum

B

Reciprocal

C

Product

D

Multiplication

Question 85

Unit of resistance is :

A

ohm

B

Mho

C

Volt

D

Ampere

Question 86

Resistance of a wire is inversely proportional to its :

A

length

B

specific resistance

C

cross sectional area

D

voltage

Question 87

If the colour band on a resistor are in the order- Red, Green, Orange and Gold. Its resistance value is ––––––––––– Ω.

A

27 ± 5%

B

27000 ± 10%

C

2700 ± 20%

D

27000 ± 5%

Question 88

Which instrument used to measure resistance :

A

volt meter

B

ohm meter

C

watt meter

D

tong tester

Question 89

Which one of the following material/ alloy is the best example of positive temperature coefficient?

A

Eureka

B

paper

C

rubber

D

glass

Question 90

Application of series parallel combination is :

A

Current divider

B

measuring current

C

Measuring resistance

D

Voltage divider

Question 91

Which of the following is a non-renewable energy source?

A

Nuclear

B

Wind

C

Tide

D

Sun

Question 92

Gasoline is a ––––––––––– fuel :

A

Solid

B

Liquid

C

Gaseous

D

Nuclear

Question 93

A generating station which utilizes the potential energy of water at a high level for the generation of electrical energy is known as :

A

Tidal power plant

B

Hydro power plant

C

Nuclear power plant

D

Water heater

Question 94

––––––––––– turbines are used for high heads :

A

Reaction turbine

B

Francis turbines

C

Kaplan turbines

D

Impulse turbines

Question 95

In nuclear power station, heavy elements such as ––––––––––– are subjected to nuclear fission in a special apparatus known as a reactor :

A

Uranium

B

Silicon

C

Carbon

D

Copper

Question 96

Wind energy utilizes :

A

Potential energy of air

B

Kinetic energy of air

C

Both (A) and (B)

D

None of these

Question 97

A solar cell convert light energy into :

A

Electrical energy

B

Thermal energy

C

Mechanical energy

D

Chemical energy

Question 98

Series parallel combination of solar cell is called :

A

Solar sight

B

Solar light

C

Solar array

D

Solar grouping

Question 99

The main constituent of bio gas is :

A

Ethylene

B

Methane

C

Hydrogen and oxygen

D

Hydrogen

Question 100

Trapped heat inside the earth is known as :

A

Heat energy

B

Kinetic energy

C

Geothermal energy

D

Thermal energy

011/2022 - Operator Grade III - Apex Societies Of Co- Operative Sector & MATSYAFED