# Practice Test: Question Set - 03

**1. In Lewis equation, gear tooth is considered as**

- (A) Simply
supported beam

- (B) Cantilever
beam

- (C) Curved
beam

- (D) None
of the above

**2. According to Lewis equation**

- (A) Pinion
is always weaker than gear

- (B) Pinion
is weaker than gear if made of same material

- (C) Gear
is weaker than pinion if made of same material

- (D) None
of the above

**3. Which of the following type of gears are free from axial thrust?**

- (A) Herringbone
gears

- (B) Bevel
gears

- (C) Worm
gears

- (D) Helical
gears

**4. Maximum gear ratio for a pair of spur gears is**

- (A) 10

- (B) 3

- (C) 100

- (D) 6

**5. The working depth for a pair of gears is given by**

- (A) Addendum
plus dedendum

- (B) Twice
the addendum

- (C) Twice
the dedendum

- (D) Dedendum
minus addendum

**6. Which of the following types of gear is free from interference?**

- (A) Cycloidal
gears

- (B) Spiral gears

- (C) Involute
gears

- (D) Stub gears

**7. Backlash is**

- (A) Sum of the
clearances of pinion and gear teeth

- (B) The amount
by which the width of a tooth space exceeds the thickness of meshing tooth on
pitch circle

- (C) Difference
between the pitch circles of meshing gears

- (D) Difference
between the dedendum and addendum of gear tooth

**8. Addendum of a cycloidal gear tooth is**

- (A) Epicycloid

- (B) Hypocycloid

- (C) Cycloid

- (D) Involutes

**9. Buckingham’s equation of gear tooth is based on**

- (A) Maximum
crushing stress in gear tooth

- (B) Maximum
bending stress in gear tooth

- (C) Maximum
shear stress in gear tooth

- (D) Maximum
contact stress in gear tooth

**10. When the axes of two shafts are perpendicular and intersecting, use**

- (A) Spur gears

- (B) Bevel gears

- (C) Worm gears

- (D) Helical
gears

**11. Maximum efficiency of a pair of spur gears is**

- (A) 99 %

- (B) 80 %

- (C) 50 %

- (D) 92 %

**12. In which type of gears, slight variation in center distance does not affect velocity ratio?**

- (A) Cycloid

- (B) Epicycloid

- (C) Involute

- (D) Hypocycloid

**13. The product of diametral pitch P and circular pitch p is equal to**

- (A) 1/π

- (B) π

- (C) π/2

- (D) 1

**14. Which of the following type of gears provide maximum velocity ratio?**

- (A) Spur gears

- (B) Bevel gears

- (C) Worm gears

- (D) Helical
gears

**15. In case of spur gears, increasing pressure angle results in**

- (A) Weaker
teeth

- (B) Bigger
size of gear

- (C) Higher
pitch line velocity

- (D) Wider
base and stronger teeth

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