Automobile Engineering Mcqs

Q:

How does the water circulation happen in a thermosyphon cooling system?

A) Due to conduction currents B) Due to a gear drove water pump
C) Due to change in the density of water D) Due to a belt-driven water impeller
 
Answer & Explanation Answer: A) Due to conduction currents

Explanation: The water circulation happens in a thermosyphon cooling system due to conduction currents. This system is simple and automatic.

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16
Q:

What is the purpose of a fan in a liquid cooling system?

A) To disperse engine fumes B) To pump cold air over the hot water
C) To cool the external surface of the engine D) To drive airflow when the vehicle speed is low
 
Answer & Explanation Answer: B) To pump cold air over the hot water

Explanation: A fan in a liquid cooling system is used to pump cold air over the hot water. The fan is mounted on the impeller spindle which is driven by a suitable belt pulley arrangement.

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23
Q:

Why does the engine overheating happen?

A) Due to a broken fan belt B) Due to excess coolant
C) Due to an open thermostat D) Due to the stuck radiator pressure cap
 
Answer & Explanation Answer: A) Due to a broken fan belt

Explanation: The engine overheating happens due to a broken fan belt. When a fan is broke, it cannot cool the hot water. It should be capable of removing about 30% of the heat from the combustion chamber.

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14
Q:

What is the purpose of the thermostat in an engine cooling system?

A) To allow the engine to warm-up quickly B) To prevent the coolant from boiling
C) To pressurize the system D) To indicate to the driver the coolant temperature
 
Answer & Explanation Answer: A) To allow the engine to warm-up quickly

Explanation: The thermostat is used to allow the engine to warm-up quickly. The thermostat unit consists of closed bellows with a volatile liquid.

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23
Q:

Which pump is used in a forced cooling system?

A) Piston pump B) Gear pump
C) Vane pump D) Centrifugal pump
 
Answer & Explanation Answer: D) Centrifugal pump

Explanation: Centrifugal pump is used in a forced cooling system. The pump is used to maintain the circulation of the water through the system. The power is transmitted to the pump spindle.

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22
Q:

What is a direct system of cooling the air?

A) Cooling water flows by gravity B) Hot water is continuously cooled and circulated
C) Hot water is simply discharged D) Water is allowed to evaporate in the cylinder jacket
 
Answer & Explanation Answer: C) Hot water is simply discharged

Explanation: In direct system of cooling air, hot water is simply discharged. In air-cooled system, a current of air is made to flow past the outside of the cylinder barrel.

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24
Q:

What is the material of the radiator cooling tube?

A) Rubber B) Plastic
C) Brass D) Copper
 
Answer & Explanation Answer: D) Copper

Explanation: Radiator cooling tubes are made of copper. Radiator cores are classified as tubular or cellular. The main disadvantage is repairing any of the damaged tubes.

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19
Q:

What is the advantage of the liquid cooling system?

A) Dependent only on water supply B) Power absorbed by the pump is considerable
C) Even cooling D) Very cheap
 
Answer & Explanation Answer: C) Even cooling

Explanation: The advantage of the liquid cooling system is even cooling. In this system, water is used as a coolant and made to circulate through the jackets provided around the cylinder, cylinder head, valve ports and seats.

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