Lesser is the number of the teeth on sprocket, the variation in the speed of chain drive is

Driving and driven pulleys are rotating at 1000rpm and 500rpm. If number of teeth on driving sprocket are 20, find number of teeth in the driven sprocket.

A

41

B

40

C

10

D

11

The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

A

$${\text{p}} = {\text{D}}\sin \frac{{{{90}^ \circ }}}{{\text{T}}}$$

B

$${\text{p}} = {\text{D}}\sin \frac{{{{120}^ \circ }}}{{\text{T}}}$$

C

$${\text{p}} = {\text{D}}\sin \frac{{{{180}^ \circ }}}{{\text{T}}}$$

D

$${\text{p}} = {\text{D}}\sin \frac{{{{360}^ \circ }}}{{\text{T}}}$$

What is the distance covered by boat N upstream in 5 hours? Which of the following option is sufficient alone to find the answer? A) Boat M is travelling downstream with 20% more downstream speed of boat N. Speed of boat M in still water is 10% more than the speed of boat N in still water. B) Boat M and Boat N are travelling downstream with speed 33 km/hr and 40 km/hr respectively and speed of boat M is still water is 2 times the speed of stream. C) Speed of boat M in still water is 6 km/hr less then speed of boat N in still water and speed of stream is 10 km/hr. D) Speed of stream is ½ times the speed of boat N in still water and downstream speed of boat M is 44 km/hr. E) Speed of stream is 10 km/hr and ratio of upstream speed of boat M and boat N is 3 : 2 respectively.

A

Only A and B

B

Only B and C

C

Only B

D

All A, B, C and D

E

None of A, B, C and D

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)

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

The driving sprocket has 19 teeth and rotates at 1100rpm. The pitch of the chain is 18mm. Calculate the velocity of the chain.

A

5.6m/s

B

6.3m/s

C

5.8m/s

D

5.1m/s

Consider the following statements: A 200 stub tooth system is generally preferred in spur gears as it results in 1. stronger teeth 2. lesser number of teeth on the pinion 3. lesser chances of surface fatigue failure 4. reduction of interference Which of the above statements are correct?

A

1,2 and 4

B

3 and 4

C

1 and 3

D

1,2,3 and 4

The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.

A

Increases

B

Decreases

C

Remain same

D

None of these

The speed of the sprocket reduces as the chain pitch _____________ for a given number of teeth.

A

increases

B

decreases

C

remains same

D

none of the mentioned

Lesser is the number of the teeth on sprocket, the variation in the speed of chain drive is

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