Engine Fuel & Air Induction Systems Practice Questions (Q1-5) - Farm Machinery and Power Engineering

ICAR JRF Farm Machinery And Power Engineering 29 Jun 2024Shift 1

Statement Based +4 −1

Given below are two statements

Statement (I) : Premixed combustion is smoother and quieter than diffusion combustion

Statement (II) : The longer the ignition delay, the higher percentage of the fuel that burns in premixed combustion and lower the percentage that burns in diffusion combustion

In light of the above statements, choose the most appropriate answer from the options given below.

Both Statement (I) and Statement (II) are correct Both Statement (|) and Statement (II) are incorrect Statement (I) is correct but Statement (II) is incorrect. Statement (I) is incorrect but Statement (II) is correct.

ICAR JRF Farm Machinery And Power Engineering 29 Jun 2024Shift 1

Assertion & Reason +4 −1

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).

Assertion (A) : The power requirement of a rotary mower is much higher than that of a sickle bar mower of the same width

Reason (R) : The knives of rotary mower are hinged to the disc or drum so that they can swing back if they hit a rock or other obstruction; centrifugal force keeps the knives in cutting position during normal operation

In light of the above statements, choose the correct answer from the options given below.

Both (A) and (R) are true and (R) is the correct explanation of (A) Both (A) and (R) are true but (R) is NOT the correct explanation of (A). (A) is true but (R) is false. (A) is false but (R) is true.

ICAR JRF Farm Machinery And Power Engineering 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

The leanest and richest combustible mixtures have air to fuel ratios of approximately 25:1 and 8:1, respectively. If the ambient temperature allows only 10% of the fuel to vaporize in the manifold, what fuel to air ratio must the carburetor deliver to start the engine?

2504 20:1 08:1 0494

ICAR JRF Farm Machinery And Power Engineering 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

The conditions conducive to cold smoke formation in a diesel engine are

High air temperatures, heavy loads, high-cetane fuels, and high air-to-fuel ratios Low air temperatures, heavy loads, high-cetane fuels, and high air-to-fuel ratios Low air temperatures, light loads, low-cetane fuels, and high air-to-fuel ratios High air temperatures, heavy loads, low-cetane fuels, and low air-to-fuel ratios