Question

The petrol engine was invented by,
A.Nikolaus Otto
B.James Watt
C.Rudolph Diesel
D.All of these

Answer 1

Hint: Petrol engines work on the cycle, which consists of 2 isochoric processes and two isentropic processes. This cycle is named after the inventor of the petrol engine. It was the first modern internal combustion engine. It is a four-stroke compressed charge engine. It was the first practical alternative to the steam engine as a power source. This engine was patented by a German scientist in 1876.

Complete answer:
Petrol engines are also known as gasoline energy. Because it was designed to run on petrol also called gasoline and similar fuels.
The petrol engine was invented in 1876. Before 1876, many inventors made attempts to build a petrol engine but were unsuccessful. Few of those inventors are George Brayton, Etienne Lenoir etc. But finally, it was invented by Nicholaus Otto. These engines work on Otto cycle. This cycle consists of two isochoric processes and two isentropic processes.
Watt Steam Engine was invented by James Watt. It was invented in the year 1769 i.e. before the invention of petrol engines. It took him 18 years to build this steam engine. Steam engines are known for polluting the environment.
Diesel engines were invented by Rudolph Diesel during the industrial revolution in the 1890s. These engines were used extensively during the industrial revolution as these engines were less expensive and more efficient. Diesel engines work on Diesel cycles. This cycle consists of an isochoric process, an isobaric process and two isentropic processes.

Hence, the correct answer is option A i.e. Nicolaus Otto.

Note: Petrol engines use spark plugs to ignite air-water mixture. While the diesel engines run without any spark plug. Petrol engines have high fuel consumption. But, the diesel has relatively low fuel consumption. A petrol engine is very compact while diesel and steam engines are very heavy and bulky.