Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because

helical gears have some helix angle but the spur gears are straight

there is end thrust in helical gears

in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate

Operation of helical gears is silent and quiet while the operation of

1.	Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because
A.	helical gears have some helix angle but the spur gears are straight
B.	there is end thrust in helical gears
C.	in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate
D.	none of the above
E.	Cast steel
Answer» D. none of the above

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Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because

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