Agricultural Engineering — Part 1 MCQs with Explanations

Step 1: In agricultural machinery, slip refers to the difference between the theoretical distance traveled by the implement and the actual distance covered on the field. Step 2: For a seed drill, the drive wheel rotates the metering mechanism which delivers seeds into the soil. Step 3: Due to soil resistance and field conditions, the drive wheel does not rotate exactly as per theoretical movement and tends to slip. Step 4: This slip is generally positive , meaning the actual distance covered is less than the theoretical distance. Final Answer: Seed drill has positive slip.

The correct answer is Option D: Kj/kg Here's why: Enthalpy is a measure of the total energy of a thermodynamic system. It's the sum of the internal energy and the product of pressure and volume. Think of it like this: It tells you how much heat energy is contained within a substance at a given temperature and pressure, and how much energy could potentially be exchanged with the surroundings. Now let's look at the units: Kj (Kilojoules) is the unit for energy or heat. kg (Kilogram) is the unit for mass. Enthalpy is often expressed as a specific enthalpy , meaning enthalpy *per unit mass*. This is why the unit for enthalpy is Kj/kg (Kilojoules per Kilogram). Let's examine the other options: Option A: Kw/kg.m - Kw (Kilowatt) is a unit of power (energy per time), not energy itself, and the 'm' is for meters, a unit of length, making it unsuitable. Option B: Kj/kg.cm - While it has Kj/kg, 'cm' (centimeter) is a unit of length and doesnt belong in enthalpy Option C: Kw - As mentioned above, Kw (Kilowatt) is a unit of power, not enthalpy. Therefore, Kj/kg is the correct unit for enthalpy.

Question: What is the common size of screen openings for wells? This question is about the size of the holes in well screens. Well screens are filters placed inside wells to prevent sand and other sediment from entering the well and contaminating the water. The size of the openings needs to be just right. Too big, and unwanted materials get in. Too small, and the water can't flow easily enough. The options give a range of sizes in millimeters (mm). Let's look at why some are more likely than others: Option A (5.0 to 10mm): This is relatively large. While it might allow good water flow, it's also likely to let in too much sediment. Option B (1.5 to 5.00 mm): This range is more reasonable. It balances allowing water flow with preventing most sediment. Option C (15 to 20 mm): This is much too large. It would allow large amounts of sediment and debris to enter the well. Option D (4.5 to 5.00 mm): This is similar to part of option A and is also a bit on the larger side, possibly allowing more sediment than ideal. Considering the balance between water flow and sediment prevention, option B (1.5 to 5.00 mm) is the most likely common size range for well screen openings .

Understanding Centrifugal Pumps and Power Centrifugal pumps use spinning blades to push water (or other liquids). The faster the blades spin (speed), the more water the pump moves. Power and Speed Relationship The power needed to run a centrifugal pump isn't just doubled if you double the speed. It increases much faster. This is because power is related to the cube of the speed. The Calculation (Simplified) Imagine the speed is 'S' and power is 'P'. If we double the speed (2S), the new power isn't 2P, it's (2S) 3 = 8S 3 , which is 8 times the original power. Therefore If you double the speed of a centrifugal pump, the power needed will increase by eight times .

The maximum noise level from a tractor near the operator's ear should not exceed 85 dB to ensure safe working conditions and prevent hearing damage. Exposure to noise levels higher than 85 dB over long periods can lead to permanent hearing loss. Key Points: >> 85 dB is the recommended maximum threshold to protect hearing. >> 100 dB and higher noise levels pose significant risks to hearing, especially with prolonged exposure. >> 95 dB and 120 dB are well above the safe limit, potentially leading to immediate damage to hearing over time.

The equation Q = dE + w represents the First law of thermodynamics, which is a statement of the conservation of energy. In this equation: >> Q represents the heat energy supplied to the system, >> dE represents the change in internal energy of the system, and >> w represents the work done by or on the system. The First law of thermodynamics asserts that energy cannot be created or destroyed, only converted from one form to another. Key Points: >> The First law is a statement about energy conservation in thermodynamic processes. >> Second law of thermodynamics deals with the direction of energy flow and entropy, not the equation Q = dE + w. >> Zeroth law establishes thermal equilibrium but is not related to this equation.

Mould Board is the correct answer to “In mould board plough, Soft Centred stell is in used for making of . . . . . . . .”. This question is standard in competitive examination syllabi for Agricultural Engineering.

All of the above is the correct answer to “The pressure drop across a fluidised bed will depend upon”. This question is standard in competitive examination syllabi for Agricultural Engineering.

All of the above is the correct answer to “Functions of seed cum fertiliser drill”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Wheat flour is the correct answer to “Toothed roll crusher are mainly used for”. This question is standard in competitive examination syllabi for Agricultural Engineering.

-30°C is the correct answer to “Temperature at which ice cream hardening room operates is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Darcy's law is the correct answer to “Q = KIA represents which equation”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Inversely is the correct answer to “Drillability of fertilizers is . . . . . . . . proportional to the kinetic angle of repose.”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Inverse is the correct answer to “Thermal efficiency of a tractor is in proportion to specific fuel consumption.”. This question is standard in competitive examination syllabi for Agricultural Engineering.

M/s Mitsubishi Ltd. is the correct answer to “Paddy transplanter is being manufactured in India by”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Work = Force (kg) × Distance (m) is the correct answer to “Work is expressed by the formula as”. This question is standard in competitive examination syllabi for Agricultural Engineering.

All of these is the correct answer to “Crop responds well for deep ploughing is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

4300 is the correct answer to “What is the calorific value (Kcal/kg) of cow-dung cake”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Honing is the correct answer to “The operation of surface finishing of the engine cylinder is called”. This question is standard in competitive examination syllabi for Agricultural Engineering.

9 - 14 m2 is the correct answer to “The area of double pipe heat exchanger should be”. This question is standard in competitive examination syllabi for Agricultural Engineering.

250 is the correct answer to “The capacity of each pen in the poultry house should not exceed . . . . . . . . birds.”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Heavy engines is the correct answer to “Cold spark plug is used on”. This question is standard in competitive examination syllabi for Agricultural Engineering.

70 kg is the correct answer to “The unit draft of an indigenous plough making a 20 cm wide and 10 cm deepV shaped-furrow in 70 kg per sq. cm. The draft is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Increasing the volumetric efficiency is the correct answer to “The maximum torque can be increased by”. This question is standard in competitive examination syllabi for Agricultural Engineering.

15 : 1 is the correct answer to “Approximate ratio weight of air fuel in diesel engine is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

2.5 : 1 is the correct answer to “The differential speed of rolls of wheat mill is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Power harrow is the correct answer to “The rotary or oscillating tool which does not tum the soil upside down is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Both A and B is the correct answer to “Important property of soil is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Unchanged is the correct answer to “If size of seed drill is doubled and speed is halved then coverage will be”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Decreases as the temperature increases is the correct answer to “Electrical resistance of a thermistor”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Tilth is the correct answer to “Physical condition of soil resulted due to tillage is called”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Gear type is the correct answer to “The most commonly used pumps in tractor hydraulic system are”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Stubble mulch tillage is the correct answer to “V-shaped sweeps are best suited for”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Treader is the correct answer to “Rotavator working in reverse direction for compacting the soil and giving good touch to inter culturing is called”. This question is standard in competitive examination syllabi for Agricultural Engineering.

1% is the correct answer to “The FPO standard for acidity of squash is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Air is the correct answer to “Which one of the following will have least value of thermal conductivity”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Both A and B is the correct answer to “Commonly used herbicide under zero tillage is”. This question is standard in competitive examination syllabi for Agricultural Engineering.

10,550 is the correct answer to “Calorific value of high speed diesel is . . . . . . . . kcal/kg.”. This question is standard in competitive examination syllabi for Agricultural Engineering.

L-2 is the correct answer to “Dimension of stream frequency is . . . . . . . .”. This question is standard in competitive examination syllabi for Agricultural Engineering.

Hooke's law is the correct answer to “Stress is directly proportional to strain within elastic limit is known as”. This question is standard in competitive examination syllabi for Agricultural Engineering.