Helical Gears Multiple Choice Questions - ObjectiveBooks

# Helical Gears MCQ Practice Test

1. In a pair of crossed helical gears, both gears have right hand helical teeth with 45° helix angle. The angle between the shafts of two gears is
(A) 45°
(B) 90°
(C) 22.5°
(D) 0°

2. In helical gears, the distance between two similar points on adjacent teeth, measured in a plane perpendicular to tooth element, is called
(A) Normal circular pitch
(B) Transverse circular pitch
(C) Axial pitch
(D) Diametral pitch

3. The range of helix angle for a single helical gear is,
(A) 15° to 25°
(B) 20° to 45°
(C) 10° to 15°
(D) 5° to 10°

4. The initial contact in helical gears is
(A) Point
(B) Line
(C) Surface
(D) Unpredictable

5. Which of the following gears have zero axial thrust?
(A) Herringbone gears
(B) Bevel gears
(C) Worm gears
(D) Helical gears

6. If z is the actual number of teeth on a helical gear and Ïˆ is the helix angle for the teeth, then the formative number of teeth is given by,
(A) z cos3 Ïˆ
(B) z/cos3 Ïˆ
(C) z cos2 Ïˆ
(D) z/cos2 Ïˆ

7. In a pair of crossed helical gears, both gears have opposite hand helical teeth with 45° helix angle. The angle between the shafts of two gears is
(A) 45°
(B) 90°
(C) 22.5°
(D) 0°

8. In a pair of helical gears, the pinion has right hand helical teeth. The hand of helix for mating gear should be,
(A) Right hand
(B) Left hand
(C) Right or left depending upon direction of rotation
(D) None of the above

9. The range of helix angle for a double helical gear is,
(A) 15° to 25°
(B) 20° to 45°
(C) 10° to 15°
(D) 5° to 10°

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