Question

Which of the following method(s) is/are generally used in spark ignition engines for evaluating volatility?

• A. Distillation test
• B. Motor method
• C. Pensky Martens closed tester
• D. Reid vapor pressure test

Hint:

To evaluate the volatility of fuels, methods like the distillation test and Reid vapor pressure test are commonly used in spark ignition engines. These tests provide valuable data on how fuels will behave under different temperature conditions.

Answer 1

The Correct Option is A, D

The volatility of fuels used in spark ignition engines is important for their performance and combustion. Let's break down the methods:

(A) Distillation test: This is correct. The distillation test is used to determine the volatility of fuels by measuring the temperatures at which specific portions of the fuel evaporate. This helps assess the fuel's behavior under different temperatures.

(B) Motor method: This is incorrect for evaluating volatility. The motor method is used to assess the performance of fuels in terms of engine power, not volatility.

(C) Pensky Martens closed tester: This method measures the flash point of a fuel, which is related to its safety properties but is not primarily used to assess the overall volatility in spark ignition engines. Therefore, this is not the correct answer.

(D) Reid vapor pressure test: This is correct. The Reid vapor pressure test measures the vapor pressure of a fuel, which directly correlates with its volatility. It’s a key method for evaluating the volatility of fuels in spark ignition engines.

Thus, the correct answers are: (A) and (D).