Farm Power - Agricultural Engineering Previous Year Questions

Fuel property that predominantly governs ‘hard / cold starting’ in SI engine is \( \mathbf{P} \) and the property that predominantly governs ‘ignition delay’ in CI engine is \( \mathbf{Q} \).
Identify the correct option for \( \mathbf{P} \) and \( \mathbf{Q} \) combination

A tractor engine delivers 382 N.m brake torque at a rated speed of 2000 rpm. The radiator cooling fan draws 5% of the engine brake power. The fan pushes 2.8 m³.s⁻¹ of air against 0.9 kPa static pressure rise. Assuming air as incompressible, and ignoring other losses, the fan efficiency, in %, is nearest to
(Take π = 3.14)

A four-cylinder four-stroke engine (100 mm bore and 120 mm stroke) runs at 1800 rpm mean speed with 0.9 MPa indicated mean effective pressure (IMEP). The flywheel constant (ratio of the energy fluctuation to the indicated work per crankshaft revolution) is 0.30. All other losses are neglected. For an allowable speed fluctuation of ±1% about the mean, the required flywheel mass moment of inertia (in kg.m²) is ______. (Rounded off to two decimal places)
(Take \(\pi\) = 3.14)

At an initial pressure of 100 kPa, 1 kg air is compressed reversibly from 15 litres to 1 litre at final pressure of 2000 kPa. Neglecting other losses, the Polytropic Exponent (n) is _____. (Rounded off to three decimal places)

Impeller speed of a centrifugal pump is increased by 30%. The power requirement of the pump increases by n times. The value of n is _____. (Rounded off to two decimal places)

A small horizontal-axis wind turbine (HAWT) is being designed to deliver 2 kW shaft power at a steady wind speed of 7 m.s^-1. The HAWT operates with an aerodynamic power coefficient of 0.36, drivetrain efficiency of 0.90, and air density of 1.225 kg.m^-3. Neglecting other losses, the required rotor diameter is X m.
When the wind speed drops to 6 m.s^-1, the shaft power is Y kW. Identify the nearest correct option for X and Y combination.
(Take π = 3.14)