Sources of Power - Farm Power - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2007

As compared to diesel, the heating value and exhaust emissions such as \(CO\), \(CO_2\) and smoke density of biodiesel when used in compression ignition engine are

A

Lower and higher respectively

B

Higher and lower respectively

C

Lower and lower respectively

D

Higher and higher respectively

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2

2007 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2007

An oil engine works on the ideal diesel cycle with a compression ratio of 18:1. The constant pressure energy addition ceases at 10% of the stroke. The intake pressure and temperature are 100 kPa and 300 K respectively. The hourly air consumption is 100 m³. If the ratio of specific heats is 1.4, the maximum temperature in the cycle is

A

953.3 K

B

1334.6 K

C

2154.5 K

D

2573.9 K

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3

2007 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2007

The mechanical efficiency of a power tiller engine developing 7.5 kW is 80%. The calorific value of diesel is 45 MJ kg\(^{-1}\). If the indicated thermal efficiency is 35%, the brake specific fuel consumption of the engine is

A

0.135 kg kW\(^{-1}\)h\(^{-1}\)

B

0.228 kg kW\(^{-1}\)h\(^{-1}\)

C

0.245 kg kW\(^{-1}\)h\(^{-1}\)

D

0.286 kg kW\(^{-1}\)h\(^{-1}\)

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4

2007 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2007

A solar photovoltaic system comprising solar photovoltaic array, inverter and a motor-pump unit is installed for supplying drinking water in a village. There are 24 modules in the array and each module contains 36 number of cells of size 104×104 mm with a conversion efficiency of 12.8%. The global solar radiation incident normally on the cells is 945 W m\(^{-2}\). The power consumed in lifting the water is found to be 435 W. If the pump-motor unit efficiency is 45%, the efficiency of the inverter is

A

56.21%

B

69.42%

C

80.25%

D

85.52%

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5

2008 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2008

A double acting single cylinder reciprocating pump has a cylinder diameter of 150 mm and stroke 300 mm. Suction and delivery heads for the pump are 3 and 30 m respectively. If the pump delivers 0.01033 m³ s⁻¹ of water at 60 rpm, the percentage slip is

A

97.43

B

1.57

C

2.57

D

0.0257

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6

2009 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2009

The type of gasifier which produces nearly tar free producer gas is

A

counter current gasifier

B

co-current gasifier

C

cross-draught gasifier

D

fluidized bed gasifier

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7

2009 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2009

A horizontal axis wind rotor is to be designed for a tip speed ratio of 1.5, rotor diameter 3.3 m and angle of attack (the angle at which the wind will strike the blade) 5°. If wind velocity in each part of the swept area of the rotor is reduced to one-third of its upstream wind velocity, the blade angle in degrees at the tip of the rotor will be

A

14

B

19

C

24

D

29

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8

2010 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2010

A farmer constructed a 2 m³ days HRT (hydraulic retention time) Deenbandhu model biogas plant. The gas will be solely used for cooking in a stove with a burner efficiency of 45%. If the density of biogas is 0.94 kg m^-3 with a heating value of 21 MJ kg^-1, the total effective energy available per day in MJ will be

A

17.77

B

18.91

C

24.47

D

39.48

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9

2026 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2026

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

P: Octane number, Q: Calorific value

B

P: Volatility, Q: Cetane number

C

P: Flash point, Q: Viscosity

D

P: Calorific value, Q: Octane number

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10

2026 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2026

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)

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11

2026 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2026

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)

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12

2026 · Agricultural Engineering · Farm Power · Sources of Power

Agricultural Engineering (AG) 2026

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)

A

X = 6.12 Y = 1.28

B

X = 3.06 Y = 0.63

C

X = 6.12 Y = 2.00

D

X = 6.75 Y = 1.50

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