Agriculture MCQs

Agri-MCQs # 20: 1000 MCQs on Agricultural Engineering

fasalbachao.com October 6, 2025

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Which is not the part of M.B. plough?
1. Tail piece
2. Shovel
3. Frog
4. Land side
Answer: B
External combustion engine is:
1. Steam engine
2. Petrol engine
3. Diesel engine
4. Both (a & c)
Answer: A
Water cooled tractors are more suitable for the areas of:
1. Hot climate
2. Desert land
3. Cold climate
4. Both (a & b)
Answer: D
In diesel engine, the component placed at the place of spark plug is:
1. Nozzle
2. Intake valve
3. Exhaust valve
4. Piston rod
Answer: A
The combustion process in a diesel engine is:
1. Constant pressure process
2. Isothermal process
3. Constant volume process
4. Adiabatic process
Answer: A
In 4-stroke diesel engines, the sequence of strokes is:
1. Intake, compression, expansion and exhaust stroke
2. Intake, expansion, compression and exhaust stroke
3. Expansion, intake, exhaust and compression stroke
4. Compression, expansion, intake and exhaust stroke
Answer: A
The temperature of the compressed air should be ____ of the fuel.
1. Below the flash point
2. Above the flash point
3. Above the fire point
4. Between the fire and flash point
Answer: C
In the intake stroke of diesel engine:
1. Only air enters into the cylinder
2. Piston is idle
3. Piston is at the top of cylinder
4. Wheel does not turn
Answer: A
The compression ratio in a diesel engine is as high as:
1. 35:1
2. 20:1
3. 10:1
4. 5:1
Answer: B
In expansion stroke of engine, when fine spray of diesel is injected into cylinder, the piston reaches at:
1. The upper part of cylinder
2. The middle of cylinder
3. The bottom of the cylinder
4. None of the above
Answer: A
In two stroke engines, the exhaust port is located:
1. Opposite to the transfer port
2. At the top of cylinder
3. At the bottom of cylinder
4. Beside transfer port
Answer: A
The actual area covered by the implement during its total consumed time is known as:
1. Effective field capacity
2. Field efficiency
3. Theoretical field efficiency
4. Theoretical field capacity
Answer: A
Soil pulverization is evaluated in terms of:
1. Soil aggregates and clod size
2. Depth of ploughing
3. Level of soil surface
4. Inversion of soil
Answer: A
During compression stroke the air is compressed according to:
1. Isothermal process
2. Hyperbolic process
3. Adiabatic process
4. Constant pressure process
Answer: C
The soil mass which is cut, lifted and thrown during ploughing is called:
1. Furrow slice
2. Cut volume
3. Replaced mass
4. Inverted mass
Answer: A
Entry of rich mixture in the cylinder can cause the problem of:
1. Over heating
2. Engine smoke
3. Failure to start the engine
4. All above
Answer: B
The function of an inverter in solar PV system is to:
1. Store energy
2. Convert DC to AC current
3. Convert AC to DC current
4. None of these
Answer: B
In seed drill, the kind of drive used to transmit the power from ground wheel to the seed metering device is:
1. Gears
2. Belt and pulley
3. Chain and sprocket
4. All above
Answer: C
A residence needs 4 kW load for electricity for 12 hours per day. Average insolation = 6 kWh·m⁻²·d⁻¹ and the photovoltaic system efficiency is 20%. The area required of PV array will be:
1. 30
2. 40
3. 60
4. 80
Answer: B
In Pakistan, mostly the biogas plants are operated in the ____ of temperature:
1. Psychrophilic range
2. Mesophilic range
3. Thermophilic range
4. All of these
Answer: B
Optical losses of solar collector ____ with the increase in temperature difference of pot content temperature and ambient temperature.
1. Increase
2. Decrease
3. Remain the same
4. Depend on fluid to be heated
Answer: C
For the same surface area, vacuum tube collectors are more efficient than flat plate collectors as the ____ losses become negligible theoretically.
1. (i) & (ii) only — conduction & convection
2. (ii) & (iii) only — convection & radiation
3. (i) & (iii) only — conduction & radiation
4. All three losses
Answer: A
Which is not a renewable energy resource?
1. Solar
2. Hydel
3. Geo-thermal
4. Natural gas
Answer: D
Transesterification process is performed to change the ____ of vegetable oil.
1. (i) & (ii) — viscosity & calorific value
2. (ii) & (iii) — calorific value & cetane no.
3. (i) & (iv) — viscosity & molecular weight
4. (iii) & (iv) — cetane no. & molecular weight
Answer: C
During the transesterification process, biodiesel is produced in the form of:
1. Methyl ester
2. Triglyceride
3. Both
4. None of these
Answer: A

Average solar global insolation in Pakistan lies from:
1. 5–7 kJ·m⁻²·day⁻¹
2. 5–7 kW·m⁻²·day⁻¹
3. 5–7 kWh·day⁻¹
4. 5–7 kWh·m⁻²·day⁻¹
Answer: D
For silicon solar cell, the energy needed to get an electron across a p–n junction is:
1. 1 eV
2. 1.1 eV
3. 1.5 eV
4. 3 eV
Answer: B
For safe and economical operation, the stack temperature in a biomass boiler should be maintained within:
1. 90–100 °C
2. 180–200 °C
3. 500–600 °C
4. None of these
Answer: B
The range of H₂S in biogas lies from:
1. 50–5000 ppm
2. 0.5–10 ppm
3. 0–5%
4. 5–10%
Answer: A
On PV–Diagram, the area of a closed figure for a thermodynamic cycle represents:
1. Work done
2. Heat energy absorbed
3. Total internal energy
4. Total entropy
Answer: A
Using approximation on TS–diagram, amount of heat energy absorbed can be calculated by multiplying the change in ____ with the average ____ during the process.
1. Temperature and entropy
2. Entropy and temperature
3. Entropy and pressure
4. Volume and pressure
Answer: B
One tonne of refrigeration is equivalent to rate of heat abstracted from the system @ ____ J·s⁻¹.
1. 2500
2. 3500
3. 4500
4. 5500
Answer: B
In a refrigeration cycle, the sequence of thermodynamic processes is:
1. (i) compression (ii) heat addition (iii) expansion (iv) heat rejection
2. (i) compression (ii) heat rejection (iii) expansion (iv) heat addition
3. (i) compression (ii) expansion (iii) heat rejection (iv) heat addition
4. (i) compression (ii) heat rejection (iii) heat addition (iv) expansion
Answer: B
If the value of n = 1 in the general law PVⁿ = C, then the process is called:
1. Isochoric process
2. Isobaric process
3. Isothermal process
4. Isentropic process
Answer: C
Isothermal process on TS–diagram is represented by a straight line parallel to ____ axis.
1. Temperature
2. Entropy
3. Pressure
4. Volume
Answer: B
The change in entropy for a given mass of a gas is measured in:
1. kJ·kg⁻¹
2. kJ
3. kJ·K⁻¹
4. kJ·°C⁻¹
Answer: C
One kg of air is heated at a constant volume from 1 bar and 27 °C to a pressure of 5 bar. The change in entropy is (Assume C_v = 0.712 kJ·kg⁻¹·K⁻¹):
1. 0
2. 0.145 kJ
3. 1.145
4. 2.145
Answer: C
Air standard efficiency is calculated for comparison of different air cycles to eliminate the effect of ____.
1. Stroke length
2. Compression ratio
3. Clearance volume
4. Calorific value of fuels
Answer: D
The efficiency of a Carnot cycle will be ____ if the temperature of the source and sink are 1000 °C and 200 °C respectively.
1. 62.84%
2. 72.84%
3. 80%
4. Cannot be determined
Answer: A
In perfect inter-cooling of a multistage compressor, ____ process is converted into ____ process to minimize the compressor power.
1. Isobaric and isothermal
2. Isothermal and reversible adiabatic
3. Irreversible adiabatic and isothermal
4. Reversible adiabatic and isothermal
Answer: D
By ____ compression ratio and ____ cut-off ratio, the ideal efficiency of a Diesel engine will be increased:
1. Increasing and increasing
2. Increasing and decreasing
3. Decreasing and increasing
4. Decreasing and decreasing
Answer: D
Under practical conditions, the efficiency of a diesel engine is more as compared to the petrol engine for the same engine dimensions due to:
1. Higher compression ratio
2. Constant pressure heat addition
3. High speed of the engine
4. Physical properties of diesel
Answer: A
The air/fuel ratios (on mass basis) for an engine using petrol (C₈H₁₈) and natural gas (CH₄) are ____ and ____ respectively.
1. 3.5 and 4
2. 15.2 and 17.4
3. 25 and 12.5
4. 17.2 and 15.2
Answer: B
On complete combustion, one kg of Diesel (C₁₆H₃₄) will produce ____ kg of CO₂.
1. 1.3
2. 3.1
3. 16
4. 32
Answer: B
According to ____ , an isothermal process is also a hyperbolic process for all gases.
1. Joule’s law
2. Charles’s law
3. Boyle’s law
4. None of these
Answer: C
The specific heat of water is ____ kJ·kg⁻¹·K⁻¹.
1. 1
2. 4.187
3. 335
4. 2257
Answer: B

The movement of inlet and exhaust valves is controlled by:
1. Crank shaft
2. Cam shaft
3. Connecting rod
4. None of them
Answer: B
Power is produced once in ____ revolution of crankshaft in a 2-stroke engine.
1. Two
2. Three
3. One
4. Four
Answer: C
Petrol engine has ____ while diesel engine has ____.
1. I & III — Carburetor & spark plug
2. II & IV — Injection pump & injector
3. III & IV — Spark plug & fuel injection pump & injector
4. I & II
Answer: C
Water pump takes the drive from:
1. Crank shaft
2. Cam shaft
3. Timing gears
4. Cooling fan
Answer: A
In diesel engine ____ is sucked in cylinder during ____.
1. Air + fuel, power stroke
2. Air + fuel, suction stroke
3. Air, suction stroke
4. Air, compression stroke
Answer: D
Connecting rod establishes a connection between ____ and ____.
1. I & II — Cam shaft & crank shaft
2. IV only — Crankshaft & piston
3. III only — Crankshaft & piston rings
4. I & III
Answer: B
The distance covered by the piston when moving from TDC to BDC and vice versa is known as:
1. Stroke
2. Piston displacement
3. Clearance volume
4. Engine size
Answer: A
Cooling system of diesel engine helps to maintain the temperature of engine at about:
1. 50 °C
2. 90 °C
3. 120 °C
4. 30 °C
Answer: B
Cooling system has following components:
1. I & III — Radiator, oil bath air cleaner
2. I only — Radiator
3. I & IV — Radiator, thermostat valve
4. III only — Oil bath air cleaner
Answer: C
Fuel injection system has following components:
1. I & IV — Intake & exhaust valves, atomizer
2. I only
3. II & IV — Radiator, atomizer
4. III only
Answer: A
Lubrication system has following components:
1. I & III — Radiator, strainer
2. II & III — Oil sump, strainer
3. I & IV — Radiator, water jackets
4. III only — Strainer
Answer: B
MF-375 & MF-260 turbo tractors have ____ and ____ brake horse power respectively:
1. I & III — 65, 75
2. II & III — 85, 75
3. III & IV — 75, 60
4. III only
Answer: C
In a material, the tensile stress is due to:
1. Tension
2. Compactness
3. Sliding on another surface
4. Compressiveness
Answer: A
To an object, the tensile stress always tends to:
1. Increase longitudinally
2. Decrease longitudinally
3. Compress
4. All above
Answer: A
The ratio of change in shape due to some external force to the original shape of the object, is called:
1. Strain
2. Compression
3. Stress
4. Compactness
Answer: A
Internal combustion engine is:
1. Steam engine
2. Petrol engine
3. Diesel engine
4. Both (b) & (c)
Answer: D
Diesel engine is the:
1. External combustion engine
2. Internal combustion engine
3. Semi-internal combustion engine
4. None of the above
Answer: B
Diesel engine follows the principle of:
1. Diesel cycle
2. Otto cycle
3. Petrol cycle
4. Auto cycle
Answer: A
Engine in which one cycle is completed in one revolution of crank shaft is called:
1. 4-stroke cycle engine
2. 2-stroke cycle engine
3. External combustion engine
4. None of the above
Answer: B
In 4-stroke cycle engine, one cycle is completed in:
1. 2 revolutions of crank shaft
2. One revolution of crank shaft
3. 4 revolutions of crank shaft
4. 3 revolutions of crank shaft
Answer: A
In a four stroke diesel engine, the ignition takes place due to:
1. Spark
2. High pressure
3. High temperature
4. Both (b) & (c)
Answer: D
In compression stroke of 4-stroke diesel engine, the piston:
1. Moves upward
2. Moves downward
3. Becomes idle
4. Moves up to middle of the cylinder
Answer: A
In 4-stroke engine, there is:
1. Only one power stroke
2. Three idle strokes
3. Three power strokes
4. Both (a) & (b)
Answer: D
The fine spray of diesel oil is injected into the cylinder of an engine during:
1. Intake stroke
2. Compression stroke
3. Power stroke
4. Exhaust stroke
Answer: C

In carburetor type petrol engine, the fuel is ignited by:
1. Electric spark
2. High compression
3. Petrol flame
4. All above
Answer: A
In carburetor type petrol engine, the fuel is mixed with air:
1. In cylinder
2. Before entering into cylinder
3. After entering into cylinder
4. None of the above
Answer: B
In diesel engine, the fuel is ignited by:
1. Heat of the compressed air
2. Spark plug
3. Electrical spark
4. None of the above
Answer: A
In diesel engines, fuel is injected into cylinder through:
1. Automizers
2. Manifold
3. Air intake
4. Exhaust valve
Answer: A
Engine weight per horsepower (HP) is more, in case of:
1. Petrol engine
2. Diesel engine
3. Air-cooled engine
4. Motor cycles
Answer: A
Top of the piston is called:
1. Crown
2. TDC
3. BDC
4. Sleeve
Answer: A
The function of cam shaft is to:
1. Lower and raise the inlet valve
2. Lower and raise the exhaust valve
3. Close the oil pan
4. Both (a) & (b)
Answer: D
In four stroke engine, the speed of cam shaft is:
1. Exactly half the speed of crank shaft
2. 5 m/s
3. 2.5 cm/s
4. 10 mm/s
Answer: A
The function of timing gear in the engine is to:
1. Open and close the valves
2. Control the fuel injection timing
3. Control the ignition timing
4. All above
Answer: D
The diameter of engine cylinder is called:
1. Bore
2. Sleeve
3. Stroke
4. Swept
Answer: A
The linear distance travelled by the piston from TDC to BDC is called:
1. Bore
2. Sleeve
3. Stroke
4. Swept
Answer: C
The portion of piston below pin, designed to absorb the side movement of piston, is called:
1. Piston head
2. Piston skirt
3. Sleeve
4. Cam
Answer: B
A shaft containing lobes, which operates the valves of the engine, is known as:
1. Crank shaft
2. Cam shaft
3. Piston rod
4. None of the above
Answer: B
The sub-soilers are operated by tractor of:
1. 60 to 80 hp
2. 35 hp
3. 50 hp
4. 25 to 35 hp
Answer: A
To pulverize the soil for seed bed preparation is the:
1. Objective of primary tillage
2. Objective of secondary tillage
3. Practice of zero tillage
4. Practice of conservation tillage
Answer: B
Seeding rate of machine is expressed as:
1. Weight per unit time
2. Weight per unit area
3. Volume per unit time
4. None of these
Answer: B
What are the number of gangs in offset disc harrow?
1. 1
2. 2
3. 3
4. 4
Answer: B
What is the tilt angle of disc plow?
1. 0 to 10 degree
2. 15 to 25 degree
3. 42 to 45 degree
4. None of these
Answer: B
How can the width of cut of disc plow be increased?
1. By increasing disc angle
2. By increasing tilt angle
3. By decreasing disc angle
4. By decreasing tilt angle
Answer: A
What is the area covered by 3-row seed drill having row size of 150 mm if the drive wheel revolves 20 revolutions having 10 mm diameter?
1. 282450 mm
2. 392600 mm
3. 282540 mm
4. 282600 mm
Answer: D
In which sprayer do droplets emerge from delivery gun with an electric charge?
1. ULV sprayer
2. Aerosol sprayer
3. Air blast sprayer
4. Electro-dyn sprayer
Answer: D

Which type of mouldboard is often used where the soil is sticky?
1. Stubble
2. Sod or breaker
3. Slat
4. General purpose
Answer: C
The furrow opener which works well in trashy soils is:
1. Inverted T type
2. Shoe type
3. Hoe type
4. Disc type
Answer: B
The metering mechanism suitable for metering small and large seeds is:
1. Fluted roller
2. Cup feed type
3. Cell feed type
4. Internal double run type
Answer: D
The most common power transmission system used in seed drill is:
1. Belt and pulley
2. Chain and sprocket
3. Gears
4. PTO shaft
Answer: B
Determine the travel speed of planter having ground wheel diameter of 610 mm and rotating at 100 rpm.
1. 3.2 km/hr
2. 3.2 m/s
3. 3.2 ft/min
4. 3.2 km/min
Answer: B