91. Which one of the following methods is suitable to calculate the Working depth of the gear?

1. Center distance between engaging gears
2. Sum of their dedendum
3. Sum of their addendum
4. Sum of the addendum of one gear

92. In gears, interference takes place when

1. Tip of a tooth of a mating gear digs into the portion between base and root circles
2. Gears do not move smoothly in the absence of lubrication
3. Pitch of the gear is not same
4. Gear teeth are undercut

93. Gear teeth are made harder to avoid

1. greater compressive stress in bending
2. tensile strength
3. abrasion
4. wear

94. Which type of gear will be used for non-parallel and non-intersecting shafts?

1. helical gears
2. hypoid gears
3. worm gears
4. herringbone gears

95. The interface or undercutting in involute gears can be avoided by

1. varying the centre distance by changing pressure angle
2. using modified involute or composite system
3. increasing the addendum of small wheel and reducing it for the larger wheel
4. all options are correct

96. The part of the tooth between the pitch circle and dedendum circle is called

1. half tooth
2. flank
3. upper tooth
4. face

97. In skew bevel gears, the axes

1. are non-parallel and non-intersecting, and the teeth are curved
2. are non-parallel and non-intersecting and the teeth are straight
3. intersect, and the teeth are curved and oblique
4. intersect, and the teeth are curved and can be grounded