In cutting spur gear, equal spacing of teeth on the gear blank can’t be performed by indexing.

A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the torque on the gear C if number of teeth on gear A, B and C are 40, 70 and 30.

A

66N-m

B

68N-m

C

53N-m

D

45N-m

A planetary gear train is shown in the figure. Number of teeth on the sun gear A, planet gear B and fixed ring gear D are given by 30, 70 and 140 respectively. Module is taken as 5mm. A pair of spur gears consist of 25 teeth pinion meshing with a 115 teeth gear. The module is 5mm. Calculate the gear ratio.

A

5

B

4.6

C

5.2

D

4

The interference between a given pinion tooth and a gear tooth can be avoided by using 1. smaller pressure angle 2. larger pressure angle 3. Less number of teeth on the gear for a pinion with predefined number of teeth 4. More number of teeth on the gear for a pinion with predefined number of teeth Which of the above statements are correct?

A

1 and 4

B

1 and 3

C

2 and 4

D

2 and 3

A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the tangential gear tooth force. Module of the gear is 5mm.

A

510N

B

526N

C

544N

D

None of the listed

A pair of spur gears consist of 25 teeth pinion meshing with a 115 teeth gear. The module is 5mm. Calculate the pitch circle diameter of the gear.

A

Cannot be determined

B

31mm

C

475mm

D

575mm

A certain dentist specializes in implanting gold and silver teeth in his patients mouths .He charges $ 650 for a gold tooth an $ 325. for a silver tooth. If his told fees for implanting gold and silver teeth last week were $ 15, 925 in total and he implanted five more gold teeth that silver teeth, how many teeth in total did he implant over the week?

A

33

B

32

C

31

D

34

Match List-I with List-II and select the correct answer using the codes given below: List-I (Animal) List-II (Teeth) (a) Cow (i) sharp curved teeth (b) Cat (ii) short front teeth (c) Snake (iii) continuously growing front teeth (d) Squirrel (iv) sharp teeth

A

(a) - (iii), (b) - (iv), (c) -(i), (d) - (ii)

B

(a) - (i), (b) - (ii), (c) -(iv), (d) - (iii)

C

(a) - (ii), (b) - (iii), (c) -(iv), (d) - (i)

D

(a) - (ii), (b) - (iv), (c) -(i), (d) - (iii)

What will be the indexing to cut 30 teeth on a gear using simple indexing method?

A

Rotate indexing crank by 5 holes in 15 holes circle

B

Rotate indexing crank by 10 holes in 15 holes circle

C

Rotate indexing crank by one complete turn and 7 holes in 21 holes circle

D

Rotate indexing crank by one complete turn and 10 holes in 15 holes circle

A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

A

2

B

4

C

3

D

none of the mentioned

The velocity ratio between pinion and gear in a gear drive is 2.3, the module of teeth is 2.0 mm and sum of number of teeth on pinion and gear is 99. What is the centre distance between pinion and the gear?

A

49.5 mm

B

99 mm

C

148.5 mm

D

198 mm

In cutting spur gear, equal spacing of teeth on the gear blank can’t be performed by indexing.

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