Set-6 MEK Motor multiple choice questions of E-pariksha meo class 4 exam

1. Which of the following statements is true?
A fuel with high cetane index has longer ignition lag and is associated with better combustion
A fuel with high cetane index has shorter ignition lag and is associated with better combustion.
A fuel with low cetane index has longer ignition lag and is associated with better combustion.
A fuel with low cetane index has shorter ignition lag and is associated with better combustion

2. Which of the following statements is true?
The TBN value of cylinder oil should be ideally matched with the sulfur content of the fuel.
The TBN value of cylinder oil is not a function of the sulfur content of fuel oil.
Cylinder oils with higher TBN values should be used for fuel oils with lower sulfur content
The TBN value of cylinder oil is a function of maximum combustion pressure.

3. As per regulations, the velocity capacity of a steering gear system should be such so as to be able to turn the rudder__________________________
35 degrees one side to 35 degrees on the other side, in 28 seconds at maximum service speed
35 degrees one side to 30 degrees on the other side in 28 seconds at maximum service speed
35 degrees one side to 35 degrees on the other side, in 28 seconds at normal service speed
35 degrees one side to 30 degrees on the other side, in 28 seconds at normal service speed

4. The purpose of valve spindle rotators in case of exhaust valves of modern two stroke engines is to:
Improve engine efficiency by allowing even temperature distribution through the combustion chamber
Allow even temperature distribution along the disc of the valve spindle, even wear rate and removal of any deposits
Utilising waste energy in the exhaust gases to increase the engine efficiency
Allow exhaust gases to exit in a rotational motion, inducing good draught of scavenge air for better mixing of air and fuel for effective combustion

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