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.

Two pulleys are connected by a belt. The sum of the diameter of two pulleys is 90 cm and while the one makes 50 rpm, the other makes 20 revolutions. What will be the diameter of the pulleys?

A

19.7cm, 70.3 cm

B

23.4 cm, 68.7 cm

C

25.7 cm, 64.3 cm

D

21.1 cm,63.2 cm

Two pulleys are connected by a belt. The sum of the diameters of the pulleys is 92.6 cm and while one makes 50 rev/min the other make 200 rev/min. What will be the diameter of the pulleys?

A

18.53 cm, 74.07 cm

B

19.65 cm, 64.89 cm

C

20.01 cm, 78.09 cm

D

17.69 cm, 69.90 cm

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

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

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

If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys.

A

First

B

Second

C

Third

D

None of these

The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

A

n

B

n²

C

2n

D

2n - 1

When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.

A

Same

B

Opposite

C

Perpendicular

D

None of these

The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

A

Heavier

B

Lighter

C

Moderate

D

None of these

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.

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