Automobile Engineering - Study Mode

[#91] The petrol engine works on
Correct Answer

(A) Otto cycle

Explanation

Solution: The petrol engine works on Otto cycle

[#92] The Diesel engine works on
Correct Answer

(C) Diesel cycle

Explanation

Solution: The Diesel engine works on Diesel cycle

[#93] The Diesel engines as compared to petrol engines require
Correct Answer

(A) Bigger flywheel

Explanation

Solution: The Diesel engines as compared to petrol engines require Bigger flywheel

[#94] The cetane number of a Diesel fuel is a measure of
Correct Answer

(C) Ignition quality

Explanation

Solution: The correct answer is (C) Ignition quality. Let's break down why: * Cetane Number: This is a special rating for diesel fuel, just like octane rating is for gasoline. * Ignition Quality: It tells us how easily and quickly the diesel fuel will start burning (ignite) when it's injected into the hot, compressed air inside a diesel engine. * Higher Cetane Number: Means the fuel ignites more readily and smoothly, leading to easier starting, less engine knocking, and reduced emissions. Now let's look at why the other options are not the best fit: * (A) Volatility: Volatility refers to how easily a liquid turns into a vapor. It's more closely related to gasoline properties (measured by vapor pressure) than diesel fuel's ignition behavior. * (B) Viscosity: Viscosity is a measure of a fluid's resistance to flow (its thickness). While important for diesel fuel, it's not directly related to the fuel's ignition characteristics. * (D) Delay Period: The delay period is the time between when the diesel fuel is injected and when it starts to burn. The cetane number is *related to* the delay period (a higher cetane number means a *shorter* delay period), but the cetane number *directly measures* the ignition quality, not the delay period itself. Ignition quality is the broader concept. Therefore, Cetane number is the measure of Ignition Quality.

[#95] The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is
Correct Answer

(B) Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads

Explanation

Solution: The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads