ISRO Draughtsman-B Mechanical Question Paper - 2019 (Set -1) with Answer Key

ISRO Draughtsman-B Mechanical Question Paper - 2019 (Set -1) with Answer Key

16) Velocity ratio of a simple wheel and axle having diameter of axle, 'd' and diameter of wheel, 'D' is

Answer is:

(D/d)

17) How much force must be applied by a person to lift an object weighing 500 kgf using a pulley block that gives him a mechanical advantage of 10?

Answer is:

50 kgf

18) Module of a gear is 4 and its pitch circle diameter is 250 mm. Calculate the number of teeth in the gear

Answer is:

60

Explanation:

Module =PCD/T
4=250/T
T=62.5
If PCD 240mm , then answer will be 60

19) A bullet of mass 10 gm travels horizontally with a velocity of 400 m/s. The kinetic energy of the bullet is

Answer is:

800 Joules

20) An object of weight 30 kgf is resting on a table. What is the minimum horizontal force needed to start it's sliding, if the co-efficient of sliding friction is 0.15?

Answer is:

4.5 kgf

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