# 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 ψ is the helix angle for the teeth, then the formative number of teeth is given by,**

- (A) z cos

^{3}ψ

- (B) z/cos

^{3}ψ

- (C) z cos

^{2}ψ

- (D) z/cos

^{2}ψ

**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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