Agri-MCQs # 20: 1000 MCQs on Agricultural Engineering

fasalbachao.com October 6, 2025

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1. 1. A device used to increase the temperature of the saturated steam without raising its pressure is called.
    1. blow off cock
    2. fusible plug
    3. Superheater
    4. economizer
    Answer: C
  2. The theoretical air supply required per kg of fuel comprising of C = 86%; H₂= 11.75%; O₂= 2.25% is…………………
    1. 8.36 kg
    2. 13.96 kg
    3. 19.52 kg
    4. 24.54 kg
    Answer: B
  3. The amount of heat absorbed to evaporate 1 kg of water from its saturation temperature, without change in temperature is called…….
    1. Sensible heat of water
    2. Latent heat of vaporization
    3. Enthalpy of steam
    4. Entropy of steam
    Answer: B
  4. The heat absorbed by one kg of water heating from 0 °C to 75 °C is…………..
    1. 250 kJ/kg
    2. 315 kJ/kg
    3. 400 kJ/kg
    4. None of these
    Answer: B
  5. The dryness fraction of steam is equal to…………….. Where; m_g= Mass of dry steam and m_f= Mass of water in suspension.
    1. m_g / (m_g + m_f)
    2. m_f / (m_g + m_f)
    3. m_g / m_f
    4. m_f / m_g
    Answer: A
  6. When the enthalpy or total heat of steam is h (kJ/kg) and the enthalpy or sensible heat of water is h_f1 (kJ/kg), then the factor of evaporation is given by…………..
    1. (h + h_f1)/2257
    2. (h × h_f1)/2257
    3. (h − h_f1)/2257
    4. h/(2257 h_f1)
    Answer: C
  7. The latent heat of steam at atmospheric pressure is…………….
    1. 1535 kJ/kg
    2. 1895 kJ/kg
    3. 2257 kJ/kg
    4. 2690 kJ/kg
    Answer: C
  8. The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called…………………..
    1. Equivalent evaporation “from & at 100 °C”
    2. Evaporative capacity of a boiler
    3. Boiler efficiency
    4. Both a and b
    Answer: C
  9. One kg of carbon monoxide (CO) requires 4/7 kg of oxygen and produces…………………
    1. 11/3 kg of CO₂
    2. 7/3 kg of CO
    3. 11/7 kg of CO₂
    4. 8/3 kg of CO
    Answer: C
  10. Which one is the physical property of materials……………………
    1. Ductility
    2. Conductivity
    3. Strength
    4. None of these
    Answer: B
  11. The maximum engineering stress is called……………..
    1. tensile strength
    2. fracture stress
    3. Poisson’s ratio
    4. None of these
    Answer: A
  12. The ratio of stress to strain in the elastic region is known as………………
    1. Young’s modulus
    2. Ultimate tensile stress
    3. Poisson’s ratio
    4. All of these
    Answer: A
  13. The energy required to raise the temperature of a unit mass of material by one degree is known as……………
    1. Thermal expansion
    2. Thermal conductivity
    3. Specific heat
    4. None of these
    Answer: C
  14. The most common example of property improvement of material is………………
    1. Casting
    2. Heat treatment
    3. Machining
    4. All of these
    Answer: B
  15. Which of these is the surface hardening process………..…….
    1. Carburizing
    2. Boronizing
    3. Induction hardening
    4. All of these
    Answer: D
  16. ………….. is used to describe the restoration of a cold worked or heat treated alloy to its original properties.
    1. Normalizing
    2. Annealing
    3. Austempering
    4. None of these
    Answer: B
  17. …………are the channels that carry the molten metal from the sprue to the mold cavity.
    1. Runners
    2. Risers
    3. gate
    4. None of these
    Answer: A
  18. The solidification time is a function of the volume of a casting and its ………….
    1. Surface area
    2. time
    3. pressure
    4. density
    Answer: A
  19. … are used to mold the sand mixture into the shape of the casting.
    1. Chaplets
    2. Plates
    3. Patterns
    4. All of these
    Answer: C
  20. The distance travelled by the tool per unit revolution of the work piece during turning operation is termed as……..
    1. Depth of cut
    2. pitch
    3. feed
    4. All of these
    Answer: C
  21. The process used to enlarge the internal diameter of a work piece is called……….
    1. Drilling
    2. Reaming
    3. Boring
    4. All of these
    Answer: C
  22. During drilling process in drill press, the work piece is clamped in …………….
    1. Vise
    2. Fixture
    3. Jig
    4. All of these
    Answer: D
  23. The machining operation in which work is fed past a rotating tool with multiple edges is called………….
    1. Turning
    2. shaping
    3. milling
    4. None of these
    Answer: C
  24. The basic form of peripheral milling in which the cutter width extends beyond the work piece on both sides is called………
    1. Peripheral milling
    2. Face milling
    3. Slab milling
    4. Slotting
    Answer: C
  25. When the material is loaded within elastic limit, then the stress is _____ to strain
    1. Equal
    2. Directly proportional
    3. Inversely proportional
    4. None of these
    Answer: B
  26. A line shaft rotating at 200 rpm is to transmit 20 kW. The torque transmitted by the shaft is…………….
    1. 915 N-m
    2. 955 N-m
    3. 970 N-m
    4. 990 N-m
    Answer: B
  27. A solid shaft running at 400 r.p.m transmits 10 kW. The diameter of the shaft is if allowable shear stress in the shaft is 40 MPa.
    1. 15 mm
    2. 25 mm
    3. 35 mm
    4. 45 mm
    Answer: C
  28. In the atmosphere, tiny solid or liquid suspended particles of various composition are called…….
    1. aerosols
    2. carcinogens
    3. greenhouse gases
    4. microbes
    Answer: A
  29. Which of the following processes acts to remove carbon dioxide from the atmosphere?
    1. lightning
    2. deforestation
    3. photosynthesis
    4. burning fossil fuels
    Answer: C
  30. Which of the following is an air pollutant? ……. ……………………………
    1. Nitrogen
    2. Carbon dioxide
    3. Carbon monoxide
    4. Oxygen
    Answer: C
  31. Which of the following on inhalation dissolved in the blood hemoglobin more rapidly than oxygen?
    1. Sulphur dioxide
    2. Carbon mono-oxide
    3. Ozone
    4. Nitrous oxide
    Answer: B
  32. Smog is……………………………….
    1. A natural phenomenon
    2. A combination of smoke and fog
    3. Is colourless
    4. All of the above
    Answer: B
  33. Air pollution from automobiles can be controlled by fitting……………………………….
    1. Cyclone separator
    2. Electrostatic precipitator
    3. Catalytic converter
    4. Wet scrubber
    Answer: C
  34. Excess fluoride in drinking water is likely to cause……………………………
    1. Blue baby syndrome
    2. Fluorosis
    3. Change in taste and odour
    4. Intestinal irritation
    Answer: B
  35. Which of the following is a non-point source of water pollution?…………………..
    1. Factories
    2. Sewage treatment plants
    3. Urban and suburban lands
    4. All of the above
    Answer: C
  36. Carbon monoxide is………………………….
    1. caused by ozone depletion
    2. a major component of the atmosphere
    3. extremely damaging to human blood
    4. consumed by plants for photosynthesis
    Answer: C
  37. Lead enters the atmosphere as a particulate pollutant. This is a problem because it………
    1. is a precious metal, and it is being lost to the atmosphere
    2. causes central nervous system malfunction in humans
    3. can become attached to radon
    4. causes excess nutrification of waterways, resulting in eutrophication
    Answer: B
  38. One of the problems that occur as a consequence of CFC pollution is…………………
    1. increasing skin cancer in humans
    2. toxins accumulating in homes
    3. damage to human red blood cells
    4. eutrophication
    Answer: A
  39. Bacteria and fungal spores can be included ………………………………..
    1. contributors to indoor pollutants
    2. VOCs and POPs
    3. the cause of high pesticide use in the home
    4. sources of radon in the home
    Answer: A
  40. Tillage is the practice of…………………………………………………………………….
    1. Modifying the soil state
    2. Controlling weed
    3. Controlling soil loss
    4. Applying soil nutrients
    Answer: A
  41. Function of mould board is to……………………………………………………………….
    1. Cut the soil
    2. Lift the soil
    3. Turn the soil
    4. Both (b & c)
    Answer: D
  42. Spike tooth harrow is used after…………………………………………………………….
    1. Ploughing
    2. Inter culturing
    3. Seeding
    4. Spreading of fertilizer
    Answer: A
  43. Seeding rate of machine is expressed as……………………………………………………
    1. Weight/unit time
    2. Weight per unit area
    3. Volume/time
    4. None of the above
    Answer: B
  44. In seed drill, the furrow opener is generally…………………………………………………
    1. Shovel type
    2. Shoe type
    3. Disc type
    4. All above
    Answer: D
  45. Distribution of seeds in row by seed drill is affected by……………………………………
    1. Shape of seed tube
    2. Inclination of seed tube
    3. Height of seed released from tube
    4. All the above
    Answer: A
  46. Which of the following is a nonrenewable energy resource?……………………………….
    1. Solar
    2. Biomass
    3. Hydroelectric
    4. Coal
    Answer: D
  47. Energy resources derived from natural organic materials are called……………………
    1. Geothermal
    2. Fossil fuels
    3. Wind
    4. All of these
    Answer: B
  48. The radiation received from the sun without having been scattered by the atmosphere is called…………………
    1. Total radiation
    2. Diffuse radiation
    3. Normal radiation
    4. None of these
    Answer: C
  49. The angle between the horizontal and the line to the sun is called……………
    1. Azimuth angle
    2. Zenith angle
    3. Solar altitude angle
    4. All of these
    Answer: C
  50. The latest value of solar constant is taken as…………………
    1. 1390.1 W/m²
    2. 1366.1 W/m²
    3. 1300.1 W/m²
    4. 1345.1 W/m²
    Answer: B
  51. The declination on February 18 is nearly.…………………..
    1. +12.27°
    2. +13.27°
    3. −12.27°
    4. −13.27°
    Answer: C
  52. The summation of altitude angle and zenith angle is………………..
    1. 0°
    2. 45°
    3. 90°
    4. None of these
    Answer: C
  53. The angular location to north or south of the equator is called………………
    1. Meridian
    2. Longitude
    3. Latitude
    4. None of these
    Answer: C
  54. Hydroelectric power (hydropower) systems convert the _____ in flowing water into electric energy.
    1. Potential energy
    2. Kinetic energy
    3. Chemical energy
    4. None of these
    Answer: B
  55. The amount of electricity that can be generated by a hydropower plant depends on…
    1. Head
    2. Flow rate
    3. Both a and b
    4. None of these
    Answer: C
  56. In Horizontal Axis Wind Turbine (HAWT), the Lift Force is perpendicular to the direction of motion. We want to make this force…………….
    1. Small
    2. Big
    3. Equal
    4. None of these
    Answer: B
  57. Doubling wind speed means _____ more power.
    1. 2 times
    2. 4 times
    3. 6 times
    4. 8 times
    Answer: D
  58. … are massive steel or concrete structures attached to the base of the units to achieve stability by their own inertia.
    1. Piled structures
    2. Gravity structures
    3. Floating structures
    4. None of these
    Answer: B
  59. The declination on February 18 is nearly.…………………..
    1. +12.27°
    2. +13.27°
    3. −12.27°
    4. −13.27°
    Answer: C
  60. Angular displacement of the sun from the plane of the earth`s equator ……….
    1. Declination
    2. Altitude
    3. Latitude
    4. None of these
    Answer: A
  61. The sun takes _____ to traverse 1 degree of longitude.
    1. 1 min
    2. 2 min
    3. 3 min
    4. 4 min
    Answer: D
  62. The instantaneous efficiency of the solar air heater can be calculated from the ratio of the …………………
    1. Useful heat and the incident energy
    2. Incident energy and Useful heat
    3. Thermal losses to the incident energy
    4. None of these
    Answer: A
  63. Photovoltaics (PV) or solar cells are often called as…………………
    1. Semiconductor
    2. Conductor
    3. Insulator
    4. None of these
    Answer: A
  64. The material used for N-type doping in solar cell is………………….
    1. Silicon
    2. Aluminum
    3. Indium
    4. Phosphorus
    Answer: D
  65. The conversion of organic material directly to a gas, termed biogas is …………..
    1. Pyrolysis
    2. Anaerobic digestion
    3. Fermentation
    4. Combustion
    Answer: B
  66. Waterwheels convert the kinetic energy of flowing water to ………………
    1. Potential energy
    2. Thermal energy
    3. Mechanical energy
    4. None of these
    Answer: C
  67. A fuel cell is an electrochemical device that combines _____ to produce electricity, with water and heat as its by-product.
    1. Hydrogen
    2. Oxygen
    3. Both a and b
    4. None of these
    Answer: C
  68. Amount of heat needed to raise the temperature of 1 g of distilled water by 1 K at sea level and normal temperature (15°C) is called…………….
    1. Joule
    2. Calorie
    3. British thermal unit
    4. None of these
    Answer: B
  69. 1 BTU is equal to………..
    1. 1054.6 J
    2. 252 Cal
    3. Both a and b
    4. None of these
    Answer: C
  70. Primary tillage is normally designed to ______.
    1. Reduce soil strength
    2. Cover plant materials
    3. Rearrange aggregates
    4. All the above
    Answer: D
  71. Secondary tillage is performed ______.
    1. After primary tillage
    2. Ploughing the soil
    3. After crop planting
    4. All the above
    Answer: D
  72. Two stroke engine is preferred for small vehicles because ______.
    1. Fuel consumption is low
    2. Shock and vibrations are less
    3. Its size is small
    4. It is easy to control
    Answer: C
  73. Piston displacement is calculated from the ______.
    1. Cylinder diameter and length
    2. Piston length and diameter
    3. Bore and stroke
    4. None of the Above
    Answer: C
  74. In constant volume combustion, the air fuel mixture is ignited ______.
    1. Within the cylinder
    2. By spark
    3. Outside the cylinder
    4. None of the above
    Answer: A
  75. If compression ratio is increased ______.
    1. Thermal efficiency will be increased
    2. Volumetric efficiency will be increased
    3. Air standard efficiency will be decreased
    4. Air standard efficiency will be increased
    Answer: D
  76. In 2-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: B
  77. 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
  78. Cam shaft is driven by ______.
    1. Crank shaft
    2. Drive wheel
    3. Piston
    4. Piston rod
    Answer: A
  79. Which type of valve arrangements requires the use of rocker arms?
    1. H-head
    2. T-head
    3. I-head
    4. L-head
    Answer: C
  80. 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
  81. The combustion process in a diesel engine is ______.
    1. Constant pressure process
    2. Isothermal process
    3. Constant volume process
    4. Adiabatic process
    Answer: A
  82. In disc harrow the penetration depth can be increased by ______.
    1. Increasing disc angle
    2. Increasing speed
    3. Removing weight box
    4. All above
    Answer: A
  83. Tachometer measures ______.
    1. Engine speed
    2. Engine power
    3. BHP
    4. IHP
    Answer: A
  84. In tandem disc harrow the two fronts throw the soil ______.
    1. Outward
    2. Inward
    3. Left side the gang
    4. Inside the gang
    Answer: A
  85. A high speed of thresher mainly causes ______.
    1. Grain damage
    2. poor threshing
    3. Greater Threshing
    4. All the above
    Answer: A
  86. 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
  87. A good fuel should contain the quality of ______.
    1. Good volatility and free from gum
    2. high antiknock value
    3. chemical purity
    4. all above
    Answer: D
  88. Renewable energy as source of farm power includes ______.
    1. Bio gas
    2. Solar Energy
    3. Wind Energy
    4. All of the Above
    Answer: D
  89. A device which is used to convert solar energy directly into electrical energy is called as
    1. Solar heater
    2. Solar concentrator
    3. Solar furnace
    4. Solar cell
    Answer: D
  90. If we know the engine speed, bore, stroke, number of cylinders and mean effective pressure in the cylinders, we can calculate ______.
    1. FHP
    2. IHP
    3. BHP
    4. All of the Above
    Answer: D
  91. Strength of any material is indicated by its ______.
    1. Stress
    2. strain
    3. compressiveness
    4. compactness
    Answer: A
  92. Subsoiler is the ______.
    1. Primary tillage plough
    2. Secondary tillage implement
    3. Conservation tillage tool
    4. Zero tillage machine
    Answer: A
  93. Knowing the speed at which an engine is running and the torque it is developing, we can calculate ______.
    1. FHP
    2. IHP
    3. BHP
    4. All of the Above
    Answer: A
  94. In a material, the tensile stress is due to ______
    1. Tension
    2. compactness
    3. sliding on another surface
    4. none
    Answer: A
  95. During combustion the pressure in the cylinder may increase to as much as ______.
    1. 50 Kg/cm²
    2. 400 Kg/cm²
    3. 10 Kg/cm²
    4. 1 kg/cm²
    Answer: A
  96. A normal ploughing is done for the depth of about ______.
    1. 15 cm
    2. 50 cm
    3. 100 cm
    4. 150 cm
    Answer: A
  97. Piston displacement is calculated from the ______.
    1. Cylinder diameter and length
    2. Piston length and diameter
    3. Bore and stroke
    4. None of the Above
    Answer: C
  98. A bushing is the ______.
    1. Replaceable lining for a bearing
    2. Worm for worm gear
    3. Pitch for pulley
    4. Sleeve in cylinder
    Answer: A
  99. A petrol engine consists of ______.
    1. Carburetor
    2. Ignition coil
    3. Spark plug
    4. All above
    Answer: D
  100. Washers are used ______.
    1. Beneath the bolt head
    2. beneath the nut
    3. To hold two metal pieces
    4. Both (a & b)
    Answer: D

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