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Consider the following statements for a 4-cylinder inline engine whose cranks are arranged at regular intervals of 90°:
1. There are 8 possible firing orders for the engine.
2. Primary force will remain unbalanced for some firing orders.
2. Primary force will remain unbalanced for some firing orders.
Which of the statements given above is/are correct?
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements for a 4-cylinder inline engine whose...
Explanation:
Firing order for a 4-cylinder inline engine:
The firing order is the sequence in which the spark plugs ignite the fuel-air mixture in the combustion chamber. The firing order for a 4-cylinder inline engine is 1-3-4-2. This means that the first cylinder to fire is cylinder 1, followed by cylinder 3, cylinder 4, and finally, cylinder 2.
Number of possible firing orders:
The number of possible firing orders for a 4-cylinder inline engine is determined by the number of different ways the cylinders can be fired while maintaining the correct firing order. For a 4-cylinder inline engine, there are only two possible firing orders: 1-3-4-2 and 1-2-4-3. This is because the firing order is determined by the position of the crankshaft, and there are only two ways to arrange the cranks to achieve the correct firing order.
Unbalanced primary force:
The primary force is the force generated by the reciprocating mass of the engine as it moves up and down in the cylinders. In a 4-cylinder inline engine, the primary force is unbalanced unless the firing order is 1-3-4-2. This is because the unbalanced force is caused by the fact that the pistons are moving in different directions at the same time. If the firing order is different, the primary force will not be balanced and will cause vibration in the engine.
Conclusion:
Therefore, statement 1 is incorrect as there are only two possible firing orders for a 4-cylinder inline engine. Statement 2 is also incorrect as primary force will remain unbalanced for all firing orders except 1-3-4-2. Hence, option D is the correct answer.
Firing order for a 4-cylinder inline engine:
The firing order is the sequence in which the spark plugs ignite the fuel-air mixture in the combustion chamber. The firing order for a 4-cylinder inline engine is 1-3-4-2. This means that the first cylinder to fire is cylinder 1, followed by cylinder 3, cylinder 4, and finally, cylinder 2.
Number of possible firing orders:
The number of possible firing orders for a 4-cylinder inline engine is determined by the number of different ways the cylinders can be fired while maintaining the correct firing order. For a 4-cylinder inline engine, there are only two possible firing orders: 1-3-4-2 and 1-2-4-3. This is because the firing order is determined by the position of the crankshaft, and there are only two ways to arrange the cranks to achieve the correct firing order.
Unbalanced primary force:
The primary force is the force generated by the reciprocating mass of the engine as it moves up and down in the cylinders. In a 4-cylinder inline engine, the primary force is unbalanced unless the firing order is 1-3-4-2. This is because the unbalanced force is caused by the fact that the pistons are moving in different directions at the same time. If the firing order is different, the primary force will not be balanced and will cause vibration in the engine.
Conclusion:
Therefore, statement 1 is incorrect as there are only two possible firing orders for a 4-cylinder inline engine. Statement 2 is also incorrect as primary force will remain unbalanced for all firing orders except 1-3-4-2. Hence, option D is the correct answer.
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Consider the following statements for a 4-cylinder inline engine whose cranks are arranged at regular intervals of 90°:1. There are 8 possible firing orders for the engine.2. Primary force will remain unbalanced for some firing orders.Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'D'. Can you explain this answer?
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