Engineering Mechanics

(^216) „„„„„ A Textbook of Engineering Mechanics

6. The velocity ratio of a first system of pulleys with 4 pulleys is
   (a) 4 (b) 8 (c) 16 (d) 15


7. If the number of pulleys in a system is equal to its velocity ratio, then it is a set of
   (a) First system of pulleys (b) Second system of pulleys
   (c) Third system of pulleys


8. In a simple screw jack, with (l) as the length of the effort wheel and (p) as pitch of the
   screw, its velocity ratio is

(a)

2 l

p

π

(b) 2

l

p

π

(c)

2 p

l

π

(d)

2

p

l

π

9. The velocity ratio of a double threaded worm geared screw jack is double than that of a
   single threaded screw jack provided other dimensions remain the same.
   (a) True (b) False

ANSWERS

1. (d) 2. (b) 3. (b) 4. (a)


2. (a) 6. (c) 7. (b) 8. (a)


3. (b)

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