[PDF]Final Answer Key Junior Instructor Mechanic Agricultural Machinery|643/2023 Solved Question Paper

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Final Answer Key Junior Instructor Mechanic Agricultural Machinery

Question Paper Code: 7/2025/OL
Category Code: 643/2023
Exam: Junior Instructor Mechanic Agricultural Machinery
Date of Test 23-01-2025
Department Industrial Training

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643/2023 Solved Question paper

Question1:-Shape and colour of the warning signs are
A:-Triangular shape, black boarder and symbol on yellow background
B:-Circular shape, red boarder with cross bar and black symbol on white
background
C:-Circular shape, white symbol on blue background
D:-Square shape, white symbol on green background
Correct Answer:- Option-A
Question2:-Which one of the following fire extinguishers should not be used for
class B fire ?
A:-Carbon dioxide extinguisher
B:-Dry powder extinguisher
C:-Foam extinguisher
D:-Water filled extinguisher
Correct Answer:- Option-D
Question3:-Which one of the following is wrong about the testing of lifting
equipment ?
A:-Inspect the lifting chain, slings and hoist before operating
B:-The lifting equipment should be calibrated once in two year
C:-Check and maintain hydraulic oil level periodically
D:-Lifting equipment should be overhauled twice a year
Correct Answer:- Option-B
Question4:-In the case of good safety practice

Clean your body with compressed air.

Leave the machine after it will stop.
A:-1 and 2 are right
B:-1 and 2 are wrong
C:-1 wrong, 2 right
D:-1 right, 2 wrong
Correct Answer:- Option-C
Question5:-__ is a marking media used on machine finished surface, it
take more time to drying than other marking media but gives very clear line.
A:-Cellulose lacquer
B:-Copper sulphate
C:-White wash
D:-Prussian blue
Correct Answer:- Option-D
Question6:-Which portion of the hammer head is left soft ?
A:-Cheek
B:-Face
C:-Wedge
D:-Pein
Correct Answer:- Option-A
Question7:-Which one of the following is used as the datum surface, while in the
marking process ?
A:-Surface gauge
B:-Angle plate
C:-Surface plate
D:-V – Block
Correct Answer:- Option-C
Question8:-The pliers used for cutting off wire close to the surface level is
A:-Slip joint pliers
B:-Side cutting pliers
C:-Flat nose pliers
D:-Multi grip pliers
Correct Answer:- Option-B
Question9:-The size of bench vice is stated by
A:-Width of jaw
B:-Maximum opening of the jaws
C:-Maximum width of work that can be hold in the vice
D:-Maximum length of work that can be hold between jaws
Correct Answer:- Option-A
Question10:-In the case of a micrometer

Micrometer is a precision measuring instrument.

Pitch of the micrometer thread is 1 mm.

Maximum length of measurement with an outside micrometer is 25 mm.

Inside micrometer have a ratchet stop to ensure uniform pressure
between
measuring faces.
A:-1 and 2 are right, 3 and 4 are wrong
B:-3 and 4 are right, 1 and 2 are wrong
C:-1 and 3 are right, 2 and 4 are wrong
D:-2 and 4 are right, 1 and 3 are wrong
Correct Answer:- Option-C
Question11:-The BIS set 4 of feeler gauge have 13 blades in the range of
A:-0.01 mm to 0.1 mm
B:-0.03 mm to 0.5 mm
C:-0.01 mm to 0.15 mm
D:-0.03 mm to 0.16 mm
Correct Answer:- Option-B
Question12:-About a metric vernier caliper

It can be used to take outside, inside and depth measurement.

Least count is 0.02″.

Least count is equal to 1 vernier scale division -1 main scale division.

Reading is taken by, multiply least count with vernier scale reading and add it to
main
scale reading.
A:-1 and 2 are right, 3 and 4 are wrong
B:-1, 2 and 4 are right, 3 is wrong
C:-1 and 4 are right, 2 and 3 are wrong
D:-All are right
Correct Answer:- Option-C

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Question13:-In the case of a depth micrometer

The direction of main scale is opposite to an outside micrometer.

For different range measurements different extension rods are used.

The measurements are taken between stock and spindle.
A:-1 and 2 are right, 3 wrong
B:-1 and 3 are right, 2 wrong
C:-2 and 3 are right, 1 wrong
D:-All are right
Correct Answer:- Option-D
Question14:-Which of the following are used to prevent pulleys from slipping on
shafts, positioning and holding collars in place, on shafts and holding shafts in place
in assemblies ?
A:-Machine bolts
B:-Set screws
C:-Driver screws
D:-Cap screws
Correct Answer:- Option-B
Question15:-Which files are used for die-sinking, engraving and in silver smith’s
work ?
A:-Barrette files
B:-Crossing files
C:-Tinker’ files
D:-Riffler files
Correct Answer:- Option-D
Question16:-It is the algebraic difference between a size, to its corresponding basic
size, it may be positive, negative or Zero, what ?
A:-Zero line
B:-Toleranced size
C:-Deviations
D:-Limits of size
Correct Answer:- Option-C
Question17:-Which tool is using for installing and removing circlips ?
A:-Circlip pliers
B:-Circlip pluckers
C:-Circlip wrench
D:-Circlip compas
Correct Answer:- Option-A
Question18:-Which material is very suitable for making Box nut of Bench vice ?
A:-HSS
B:-Babbitt metal
C:-Phosphor Bronze
D:-Mild Steel
Correct Answer:- Option-C
Question19:-The _ of a drill bit is the angle formed between the leading
edge of the spiral (Flute) and the axis of the drill bit.
A:-Rake angle
B:-Point angle
C:-Clearance angle
D:-Helix angle
Correct Answer:- Option-D
Question20:-Which of the following is not a Lapping Abrasive Particle ?
A:-Aluminium Carbide
B:-Silicon Carbide
C:-
D:-
Correct Answer:- Option-C
Question21:-Which work holding device is suitable for grinding Large or irregularly
shaped parts ?
A:-Centers or Collet chuck
B:-Faceplate or T-slot Table
C:-Vacuum Chuck
D:-None of these
Correct Answer:- Option-B
Question22:-What is the “oversize” for calculate drill size for reaming ?
A:-0.02 mm
B:-0.05 mm
C:-0.03 mm
D:-0.04 mm
Correct Answer:- Option-B
Question23:-What is the appearance of cold rolled M.S. Sheet ?
A:-Bluish black
B:-Plain silver white
C:-Bluish gray
D:-Reddish brown
Correct Answer:- Option-B
Question24:-What is the other name of knocked up seam ?
A:-Paned down seam
B:-Hammer lock seam
C:-Bottom double seam
D:-Locked grooved seam
Correct Answer:- Option-C
Question25:-Which solder is used for soldering brass, copper and jewellery ?
A:-Coars solder
B:-Eutetic alloy
C:-Common solder
D:-Extra fine solder
Correct Answer:- Option-D
Question26:-Which type of fluxes are acidic and chemically active ?
A:-Inorganic fluxes
B:-Organic fluxes
C:-Non-corrosive fluxes
D:-Passive fluxes
Correct Answer:- Option-A
Question27:-What is the capacitance value of a capacitor that requires coulomb to
charge to 35 volt ?
A:-0.014 F
B:-0.025 F
C:-0.14 F
D:-0.25 F
Correct Answer:- Option-A
Question28:-Four resistors = 100 Ω, = 200Ω, = 300Ω and = 400Ω in a
series circuit are connected across 50 V. What is the voltage drop across the
resistance ?
A:-5 volt
B:-10 volt
C:-15 volt
D:-20 volt
Correct Answer:- Option-B
Question29:-What is the unit for Quantity of electricity ?
A:-Mho
B:-Ampere-second
C:-Volt/second
D:-Ampere/second
Correct Answer:- Option-B
Question30:-What is the value of resistance of the resistor if the colour coding is
Orange, Red and Silver ?
A:-330 ± 5% Ohm
B:-3300 ± 10% Ohm
C:-33000 ± 5% Ohm
D:-330000 ± 10% Ohm
Correct Answer:- Option-B
Question31:-Calculate the hot resistance of 200W/250V rated lamp.
A:-31.25Ω
B:-62.5Ω
C:-312.5Ω
D:-625Ω
Correct Answer:- Option-C
Question32:-What is the current carrying capacity of 32Amp. rated cable, if it is
protected by the rewireable fuse ?
A:-13 Amp
B:-16 Amp
C:-26 Amp
D:-39 Amp
Correct Answer:- Option-C
Question33:-What is the internal resistance of a discharged battery ?
A:-High
B:-Low
C:-Remains same
D:-Negative
Correct Answer:- Option-A
Question34:-Three resistances (= 6Ω), and (= 3Ω) in a parallel circuit
connected across 24 Volt, draws a total current 15 Ampere, what is the resistance
value of ?
A:-2 Ω
B:-4 Ω
C:-6 Ω
D:-8 Ω
Correct Answer:- Option-C
Question35:-In a house, 5 Nos. of 40 W Tube Lights, 4 Nos. of 80 W fans, 1 No. of
120 W T.V. receiver and 4 Nos. of 60 W lamps are used for 5, 8, 5 and 4 hours/day
respectively. Calculate the total energy consumed in unit’s per day.
A:-5.24 unit
B:-6.42 unit
C:-5.42 unit
D:-6.24 unit
Correct Answer:- Option-A
Question36:-What happens to the resistance of LDR, if the intensity of light is
increased ?
A:-Increases
B:-Decreases
C:-Remains same
D:-Becomes infinity
Correct Answer:- Option-B
Question37:-What is the output voltage of lithium cell ?
A:-1.2 V
B:-1.5 V
C:-1.8 V
D:-2.5 V
Correct Answer:- Option-D
Question38:-Which device converts sunlight into electrical energy ?
A:-Photo voltaic cell
B:-Liquid crystal diode
C:-Light emitting diode
D:-Light dependent resistor
Correct Answer:- Option-A
Question39:-How the capacity of batteries is specified ?
A:-Volt
B:-Watt
C:-Volt Ampere
D:-Ampere hour
Correct Answer:- Option-D
Question40:-The maximum reverse voltage that can be applied to the diode without
destruction is
A:-Peak inverse voltage
B:-Maximum forward voltage
C:-Forward voltage
D:-Maximum average votlage
Correct Answer:- Option-A
Question41:-The ratio of dc collector current to dc base current is called
A:-dc alpha
B:-dc beta
C:-dc gamma
D:-dc delta
Correct Answer:- Option-B
Question42:-In UJT the intrinsic stand-off ratio is the property of the UJT is always
A:-Unity
B:-Greater than Unity
C:-Less than Unity
D:-Zero
Correct Answer:- Option-C

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Question43:-According to Boolean algebra, the AND gate performs
A:-Logical addition
B:-Logical multiplication
C:-Logical division
D:-Logical inversion
Correct Answer:- Option-B
Question44:-Which one of the following is an electric arc welding process ?
A:-Thermit welding
B:-Friction welding
C:-Electro slag welding
D:-Forge welding
Correct Answer:- Option-C
Question45:-Which type of material used for making ARC welding electrode holder
and earth clamp ?
A:-Galvanised iron
B:-High carbon steel
C:-Copper and its alloy
D:-Mild steel
Correct Answer:- Option-C
Question46:-Which of the following is not true about AC welding transformer ?
A:-Freedom from ARC blow
B:-Suitable for easy welding of non ferrous metals
C:-Step down transformer
D:-Less initial cost than DC welding machine
Correct Answer:- Option-B
Question47:-Which type of flux coated electrodes is most suitable for welding high
strength steel without cracks ?
A:-Rutile electrodes
B:-Cellulosic electrodes
C:-Iron power electrodes
D:-Basic coated electrodes
Correct Answer:- Option-D
Question48:-Which one of the following is the power source of a pneumatic system
?
A:-Air receiver
B:-Compressor
C:-Valve
D:-Muffler
Correct Answer:- Option-B
Question49:-Which of the following statement is/are correct about viscosity of a
liquid ?
i. It indicates the resistance to flow.
ii. Viscosity decreases as temperature increases.
iii. Viscosity decreases as temperature decreases.
A:-Only i and ii
B:-Only i
C:-Only ii and iii
D:-Only iii
Correct Answer:- Option-A
Question50:-The rate of change of viscosity between two temperature is called
A:-Viscosity range
B:-Viscosity rate
C:-Viscosity index
D:-Viscosity coefficient
Correct Answer:- Option-C
Question51:-What is the working principle of a hydraulic jack ?
A:-Joule’s law
B:-Newton’s laws of motion
C:-Boyles law
D:-Pascal’s law
Correct Answer:- Option-D
Question52:-Which of the following statement is/are correct about a diesel engine ?
i. It is called as constant pressure cycle engine.
ii. It is called as constant volume cycle.
iii. It is a compression ignition engine.
A:-Only i and iii
B:-Only i
C:-Only ii
D:-Only ii and iii
Correct Answer:- Option-A
Question53:-Distance between Center of the crank pin to the Centre of the main
journal of a crank shaft is known as
A:-Throw
B:-Stroke
C:-Cycle
D:-Efficiency
Correct Answer:- Option-A
Question54:-Which of the following statement is/are correct about piston pin
arrangement of an IC
engine ?
i. Full floating type arrangement is used in modern IC engines.
ii. Gudgeon pin is used to connect piston to connecting rod.
iii. Bush bearing is provided in piston pin boss in full floating type arrangement.
A:-Only ii and iii
B:-Only i
C:-Only i and ii
D:-All the statements i, ii and iii
Correct Answer:- Option-C
Question55:-What is the term used to refer to the valve timing of an IC eingine,
when a valve closes after BDC ?
A:-Over lap
B:-Lead
C:-Advance
D:-Lag
Correct Answer:- Option-D
Question56:-Which of the following statement is/are correct about the property of
lubricant used in an IC engine lubrication system ?
i. Boiling temperature should be low.
ii. It should develop foam during working.
iii. Oil viscosity should not be same in hot and cold condition of the engine.
iv. Oil viscosity should be suit all the operating conditions.
A:-Only iv
B:-Only i and iv
C:-Only ii
D:-Only ii, iii and iv
Correct Answer:- Option-A
Question57:-Where the thermostat valve is provided in a pressurised cooling
system of an IC engine ?
A:-Coolant outlet of coolant pump
B:-Coolant outlet of cylinder head
C:-Coolant outlet of radiator
D:-Coolant outlet of coolant jacket
Correct Answer:- Option-B
Question58:-Which of the following statement is/are correct about the Turbo
chargers used in an IC
engine ?
i. Power and efficiency can be increased by using turbochargers.
ii. Turbo chargers are driven by belt/chain through crankshaft or cam shaft pulley.
iii. There is a chance of Turbo lag while using Turbocharger.
A:-Only i
B:-Only i and iii
C:-Only ii
D:-All of the above i, ii and iii
Correct Answer:- Option-B
Question59:-Where the positive crank case ventilation fitted in an engine ?
A:-Muffler and air cleaner
B:-Silencer and air cleaner
C:-Feed pump and air cleaner
D:-Engine breather and air cleaner
Correct Answer:- Option-D
Question60:-What is the purpose of Exhaust Gas Recirculation system in an IC
engine ?
A:-To reduce Carbon Monoxide (CO) emissions
B:-To reduce Carbon dioxide emissions
C:-To reduce cold starting difficulty and recirculate unburned fuel to
combustion chamber
D:-To reduce Nitrogen Oxides (NOx) emissions
Correct Answer:- Option-D
Question61:-What is the use of catalytic converters ?
A:-Control the noise
B:-Control the fuel consumption
C:-Control the emission
D:-Control the temperature
Correct Answer:- Option-C
Question62:-What is the primary function of a carburetor in an engine ?
A:-Measure exhaust gases
B:-Mix air and fuel for combustion
C:-Control engine speed
D:-Lubricate engine components
Correct Answer:- Option-B
Question63:-What is the purpose of the fuel injection pump in a diesel engine ?
A:-Clean the air-fuel mixture
B:-Pressurize fuel for injection
C:-Cool the engine
D:-Reduce noise
Correct Answer:- Option-B
Question64:-What is the function of the clutch in a vehicle ?
A:-Increase engine speed
B:-Transfer power from engine to transmission
C:-Reduce emissions
D:-Provide steering assistance
Correct Answer:- Option-B
Question65:-What is the primary function of hydraulic steering ?
A:-Increase fuel economy
B:-Provide smoother steering control
C:-Reduce braking distance
D:-Adjust suspension height
Correct Answer:- Option-B
Question66:-What is the importance of maintaining correct tire pressure ?
A:-Enhances braking performance
B:-Prolongs tire life
C:-Improves fuel efficiency
D:-All of the above
Correct Answer:- Option-D
Question67:-What is a potential danger of overloading tractor equipment ?
A:-Increased fuel efficiency
B:-Improved performance
C:-Shortened lifespan of implements
D:-Enhanced traction
Correct Answer:- Option-C
Question68:-The speed of camshaft in relation to crankshaft of an IC engine is
A:-Double
B:-Half
C:-Triple
D:-None of the above
Correct Answer:- Option-B
Question69:-The size of the gear is usually specified by
A:-Pitch surface
B:-Circular pitch
C:-Addendum
D:-Pitch circle diameter
Correct Answer:- Option-D
Question70:-Gears are used for
A:-Changing shaft direction
B:-Changing speeds
C:-Transmitting power
D:-All of the above
Correct Answer:- Option-D
Question71:-Lewis formula is used for
A:-Belt drive
B:-Chain drive
C:-Gears
D:-None of these
Correct Answer:- Option-C
Question72:-Which plough is used for breaking hard soil layers ?
A:-Disc plough
B:-Subsoiler
C:-Chisel plough
D:-Rotary plough
Correct Answer:- Option-B
Question73:-What maintenance is recommended for tillage equipment ?
A:-Daily and periodic maintenance
B:-Annual maintenance only
C:-Seasonal lubrication
D:-No maintenance is needed
Correct Answer:- Option-A
Question74:-What is a key function of a rotavator ?
A:-Remove weeds
B:-Level the soil
C:-Pulverize soil
D:-Harvest crops
Correct Answer:- Option-C
Question75:-What distinguishes disc harrows from drag harrows ?
A:-Disc harrows are used for light tillage
B:-Disc harrows cut and mix soil, drag harrows smooth it
C:-Drag harrows are powered, disc harrows are not
D:-Drag harrows are for wet conditions
Correct Answer:- Option-B
Question76:-Which of the following adjustments is crucial for safe harrow operation
?
A:-Hitching height
B:-Wheel alignment
C:-Tire pressure
D:-Fuel efficiency
Correct Answer:- Option-A
Question77:-What is a common problem in harrow operation ?
A:-Excessive soil compaction
B:-Uneven soil mixing
C:-Overheating of blades
D:-Fuel inefficiency
Correct Answer:- Option-B
Question78:-What are shovels and sweeps used for in cultivators ?
A:-Seed planting
B:-Fertilizer spreading
C:-Weed removal and soil aeration
D:-Soil leveling
Correct Answer:- Option-C
Question79:-Which equipment is used for forming bunds ?
A:-Leveler
B:-Scraper
C:-Blade terracer
D:-Bund former
Correct Answer:- Option-D
Question80:-What distinguishes a laser leveler from a conventional leveler ?
A:-Precision leveling
B:-Lower operational cost
C:-Easier maintenance
D:-Manual operation
Correct Answer:- Option-A
Question81:-Why is trouble shooting important for farm implements ?
A:-Reduces wear and tear
B:-Prevents operational delays
C:-Ensures efficient performance
D:-All of the above
Correct Answer:- Option-D
Question82:-A device placed over riser valve outlets as a means of connecting
portable gated pipes to the pipeline is known as
A:-Air vent
B:-Gate stand
C:-Hydrant
D:-None of the above
Correct Answer:- Option-C
Question83:-The pressure drop permitted between two ends of a lateral in a drip
irrigation system is
A:-2%
B:-5%
C:-10%
D:-15%
Correct Answer:- Option-C
Question84:-When selecting a sprinkler system, it is important to ensure that the
average application rate is _ the basic infiltration rate of the soil.
A:-less than
B:-equal to
C:-more than
D:-None of the above
Correct Answer:- Option-A
Question85:-_ is the part of a cone spray nozzle that imparts rotation to
the liquid passing through it.
A:-nozzle tip
B:-nozzle disc
C:-swirl plate
D:-none of the above
Correct Answer:- Option-C
Question86:-The lead adjustment provided to the outer end of the cutter bar, when
the mower is not in operation is
A:-1 cm per meter of cutter bar
B:-2 cm per meter of cutter bar
C:-3 cm per meter of cutter bar
D:-5 cm per meter of cutter bar
Correct Answer:- Option-B
Question87:-___ starter is used in high rating 3 phase motors.
A:-On-off switch
B:-Push button
C:-Direct on-line
D:-Star-Delta
Correct Answer:- Option-D
Question88:-The power operated chaff cutters are operated in the working speed
range of
A:-400 − 600 rpm
B:-600 − 800 rpm
C:-800 − 1000 rpm
D:-600 − 1000 rpm
Correct Answer:- Option-D
Question89:-If a hammer mill is operated at recommended speed, its capacity
depends on :
i. rate of feeding.
ii. hardness of feed to be ground.
iii. size of screen opening.
A:-i and ii
B:-i and iii
C:-ii and iii
D:-i, ii and iii
Correct Answer:- Option-D
Question90:-The spray droplet diameter that divides the volume of spray into two
equal parts is defined as
A:-Volume mean diameter
B:-Volume median diameter
C:-Number mean diameter
D:-Number median diameter
Correct Answer:- Option-B
Question91:-The function of the star wheel in a vertical conveyor reaper is to
A:-hold the crop in vertical position
B:-convey the crop to one side
C:-guide the crop to the cutter bar
D:-all of the above
Correct Answer:- Option-C
Question92:-A _ pump causes a fluid to move by trapping a fixed amount
of fluid and then forcing the trapped volume of fluid into the discharge pipe.
A:-Positive displacement
B:-Non positive displacement
C:-Centrifugal
D:-None of the above
Correct Answer:- Option-A
Question93:-Threshing can be accomplished by
A:-Rubbing action
B:-Impact action
C:-Stripping action
D:-All of the above
Correct Answer:- Option-D
Question94:-A single disc type furrow opener is suitable for
A:-hard soil
B:-trashy fields
C:-wet sticky soil
D:-all of the above
Correct Answer:- Option-D
Question95:-The normal ratio of peripheral speed to forward speed in a combine
harvester is in the range
A:-1.00 to 1.25
B:-1.25 to 1.50
C:-1.50 to 1.75
D:-1.75 to 2.00
Correct Answer:- Option-B
Question96:-The free threshed grain carried over the rack in the straw and
discharged from the combine harvester is called
A:-Grain loss
B:-Rack loss
C:-Cylinder loss
D:-Shoe loss
Correct Answer:- Option-B
Question97:-_ are the cutting element used for cutting in flail mowers.
A:-cutting discs
B:-rotating knives
C:-swinging knives
D:-none of the above
Correct Answer:- Option-C
Question98:-Size reduction of grains occurs by impact in a
A:-Burr mill
B:-Hammer mill
C:-Both of the above
D:-None of the above
Correct Answer:- Option-B
Question99:-In a volute pump, the casing is proportioned to gradually _
the velocity of the liquid as it flows from the impeller to the discharge.
A:-Increase
B:-Reduce
C:-Maintain
D:-None of the above
Correct Answer:- Option-B
Question100:-Grading of seeds is done to obtain good quality seeds with higher
i. germination.
ii. viability.
A:-i
B:-ii
C:-i and ii
D:-None of the above
Correct Answer:- Option-C