This set of Farm Tractor Multiple Choice Questions & Answers (MCQs) focuses on “Heat Transfer and Cooling System”.
1. What are the extended surfaces on the engine?
a) Fins
b) Plough
c) Tooth
d) Fans
View Answer
Explanation: The extended surfaces are called fins. They are used for dissipating the heat from the engine. The fins are mostly in the engines of small machines like power tiller, inter-cultivator.
2. Which fins dissipate more heat than long fins?
a) Enlarged fins
b) Short fins
c) Infinite fin
d) Less number of fins
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Explanation: The shorter fins have more surface area than the larger fins and have higher convection rate. This makes the heat to dissipate at a higher rate relative to the long fins. Convection is the heat transfer by fluids.
3. How do air-cooled engines in a tractor work?
a) Using air current
b) Using water
c) Using distilled water
d) Using the oil
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Explanation: The air-cooled engines are constructed with metallic or alloy fins for higher heat dissipation. There will also be fans available for forced convection. It is the external supply of air to remove the heat away from the engine walls.
4. The air-cooled engines have less weight.
a) True
b) False
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Explanation: Air-cooled engines of tractors and power tillers weigh lesser than the water-cooled engines. Because there are no need for water passages/jackets and pumps. It is simple in manufacturing and advantageous in the cold climatic zones.
5. What is the purpose of fan attachment to water-cooled engines?
a) To provide cool air
b) To provide hot air
c) To increase the temperature
d) To decrease the power
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Explanation: The fan is attached often to the crankshaft or also to pumps. The fan rotation provides air current to decrease the temperature of the hot water utilized by engines for cooling purposes.
6. Why a radiator is essential in the tractor engines?
a) To cool the hot water
b) To warm the water
c) To radiate energy
d) To increase the temperature
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Explanation: A radiator is a tubular structure used for decreasing the temperature of hot water coming out of the water passages of an engine. It mostly consists of tubes and tanks on the top and bottom of it.It is often fitted in front of the fan.
7. What is a thermostat valve in cooling systems of the engine?
a) Self-operating valve
b) Self-destructing valve
c) Electrically operated valve
d) Magnetically operated valve
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Explanation: A thermostat valve is a self-operating valve fitted in the cooling system of engines. It allows the hot water from the engine side to the radiator to get cooled. If the water from the engine is not at a higher temperature, it is re-circulated to the engine. It has some substance such as wax inside to open the valve by pushing rod out when hot water flows to it.
8. The water pump has its inlet from the radiator in water-cooled engines.
a) True
b) False
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Explanation: The water pump’s inlet is from the radiator bottom end. The cooled water is pumped out from the radiator and delivered to the water jackets. The water cooling system is a closed-loop as water is flowing from the radiator to the engine as a cycle.
9. Which is installed in the water cooling system of engines to increase the boiling point of water?
a) Pressure gauge
b) Pressure cap
c) Heat source
d) Pressure chamber
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Explanation: A radiator pressure cap is installed in water-cooled engines for increasing the pressure which increases the boiling point of water. This will increase engine performance.
10. Why the anti-freeze solution is used in water-cooled engines?
a) To avoid freezing
b) To enhance freezing
c) To avoid melting
d) To increase melting
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Explanation: In higher altitudes and cold zones, the water will freeze. It will damage the engine components. To avoid freezing, anti-freeze solutions which have a high boiling point, are mixed with water.
11. What is reverse flushing of the radiator?
a) Cleaning system
b) Testing system
c) Normal operation
d) Repairing
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Explanation: The reverse flushing is a cleaning system of the radiator. The thermostat valve is removed and the water is let into flow in a reverse manner i.e. a flushing gun is attached to the pump side opening.
12. How to test a thermostat valve?
a) To place it in hot water
b) To place it in cold water
c) To place it in ice
d) To spray it with cold water
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Explanation: A thermostat valve can be checked by placing it in the hot water of a specified temperature. The valve will open due to higher temperature and it ensures the valve is at good operating conditions.
13. What will happen if the engine is over cooled while in operation?
a) Decrease engine performance
b) Increase engine performance
c) Double engine performance
d) Quadruple engine performance
View Answer
Explanation: If a cooling system is defective, it may over cool the engine. It will affect the engine thermal efficiency and may the fuel do not have complete combustion. Because it reduces the engine temperature from the optimum temperature.
Sanfoundry Global Education & Learning Series – Farm Tractor.
To practice all areas of Farm Tractor, here is complete set of Multiple Choice Questions and Answers.
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