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Consider the following statements: The axes of spiral bevel gear are non-parallel and intersecting.             

1. The most common pressure angle for spiral bevel gear is 200.

2.   The most common spiral angle for spiral bevel gear is 350.

3.   Spiral bevel gears are generally interchangeable.

4.   Spiral  are noisy and recommended for low speeds of 10m/s.

Which of the above statements are correct?

(a) 1 and 4 (b) 1 and 2

(c) 2 and 3                      (d) 3 and 4

 

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