Farm Tractor Questions and Answers – Air Cleaners and Mufflers

This set of Farm Tractor Multiple Choice Questions & Answers (MCQs) focuses on “Air Cleaners and Mufflers”.

1. What is the purpose of air cleaners in tractors?
a) To clean air
b) To release gases
c) To compress air
d) To expand air
View Answer

Answer: a
Explanation: The air cleaner is a main and essential part fixed to the engine intake passage. As air is used in the combustion, it should be free from dirt to get higher efficiency and to reduce the wear and tear of the engine.

2. What is the oil wetted mesh air cleaner in a tractor?
a) Oil sprayed inside the cleaner
b) Metallic mesh wetted with oil
c) Oil stored inside the cleaner
d) Oil circulation inside the cleaner
View Answer

Answer: b
Explanation: The oil wetted mesh air cleaner is a type of air cleaner with metallic mesh wetted with the oil. This traps the dirt in the air current. It is oil coated and there will be clogging of dirt within short usage.

3. Why is the pre-cleaner required in the air cleaners of the tractor?
a) To pre-clean the air with heavier dust
b) To pre-clean the air cleaner before fitting it
c) To filter the oil before topping up
d) To pre-clean the exhaust gases
View Answer

Answer: a
Explanation: The tractors are operated in the field lands and so there will be more dust particles in the air. To filter the particles, a pre-cleaner is installed in the air cleaner. The drawn air gets swirled and heavier particles deposited.

4. Complete the block diagram for the air passage to the cylinders of a diesel engine.

a) Inlet valves
b) Exhaust valves
c) Injector
d) Carburettor
View Answer

Answer: a
Explanation: The inlet valves are the end, where the cleaned air is pushed into the cylinder for compression. The air is pre-cleaned and then enters into the main cleaner. After cleaning, it flows to the cylinder through inlet manifold and inlet valves.

5. Verify the block diagram for the air passage of the petrol engine.

a) False
b) True
View Answer

Answer: b
Explanation: In petrol engines, the air and the fuel are mixed separately in the carburettor before entering into the cylinder. Thus, air from air cleaner enter carburettor and then pushed into the cylinder through inlet manifold and inlet valves.

6. What is the cleaning element of a dry air cleaner in a tractor?
a) Wire netting or paper
b) Steel sieve
c) Cotton cloth
d) Glass plate
View Answer

Answer: a
Explanation: The dry air cleaner has a cleaning element made of multiple–wire net and also paper or nylon. The air is passed through the cleaning element and directed into the cylinder. It filters the air particles up to 4 microns in recently developed tractors.

7. What is an oil bath air cleaner in tractors?
a) Air cleaner with oil
b) Cleaning element dipped in oil
c) Spray of oil into the air
d) Cleaner is immersed in oil
View Answer

Answer: a
Explanation: The air cleaner has oil of specific grade through which the air is passed. The dusts get deposited in the oil. It is fitted vertically as the oil is stored in the bottom. The oil bath air cleaners are mostly used in tractors.

8. The oil in the oil bath air cleaners has to be changed when the oil colour changes.
a) True
b) False
View Answer

Answer: a
Explanation: The oil in the oil bath air cleaners should be changed regularly i.e. after 50 hours of use in normal conditions. Before topping up of oil, it is checked for its level and dust deposition. It should be noted that the specified oil grade is always preferred.

9. Why a turbocharger is used in the engine of the tractor?
a) Forced induction
b) Decrease speed
c) Decrease power
d) Decrease torque
View Answer

Answer: a
Explanation: The turbochargers are used to forced induction of air into the cylinder. There is a compressor driven by turbocharger which compresses the air. The turbocharger is run by force of exhaust gases.

10. Why a muffler is essential in tractor engines?
a) To decrease the noise
b) To increase the noise
c) To contaminate the gas
d) To increase the velocity of the gas
View Answer

Answer: a
Explanation: The muffler is a device fitted to the exhaust manifold which reduces the noise and pressure of the expelled gases. There are many chambers inside the muffler. In modern mufflers, there are more filter elements which reduce the soot in the exhaust gases.

11. Which type of muffler is mostly used in tractors?
a) Horizontal muffler
b) Vertical muffler
c) Backward muffler
d) Downward muffler
View Answer

Answer: b
Explanation: The vertically fitted mufflers or silencers are common in tractors. It should be fitted far from the operator and with optimum height for keeping away the exhaust gases from the operator. There is also a cover on the top to prevent rain splashes into it.

12. What is a spark arrester in engines?
a) To reduce sparks
b) To ignite fire
c) To increase engine temperature
d) To increase engine pressure
View Answer

Answer: a
Explanation: As tractors are used in fields, there will be more vegetative stubble which can get ignited from soot expelled from the muffler. A spark arrester is used to reduce the sparks or fire, which is mostly combined with the muffler as a single unit.

13.Verify the passage of exhaust gas.

a) Muffler
b) Air filter
c) Fuel filter
d) Supercharger
View Answer

Answer: a
Explanation: The exhaust gases are expelled from the cylinder through the exhaust valve and then pass through the exhaust manifold. They are getting into the turbocharger and finally muffler.

14. What is the purpose of a supercharger in a tractor engine?
a) To increase air pressure
b) To decrease air pressure
c) To decrease air temperature
d) To decrease the noise
View Answer

Answer: a
Explanation: The superchargers are driven by a mechanical element and it drives the compressor to compress the air. The air pressure is increased. It eventually increases the engine power output.

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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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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