QUESTION PAPER 5

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1. a) Define mechanical advantage, Velocity ratio and efficiency as applied to machines.
Derive the relation between them. (7)
b) A motor car of mass 25 quintals is moving with a velocity of 36 km/hr. By the
application of brakes it is brought to rest in a distance of 25m. find the average force
of resistance. (7)
2. a) Explain the terms “Gyro inertia” and “Gyroscopic motion”. (7)
b) The radii of a differential pulley are 0.70 m and 0.65 m respectively.A force of 50
newtons is required to lift a load of 1000 newtons. find the mechanical advantage,
velocity ratio and efficiency. (7)
3. a) Explain the terms “meta centre” and “centre of buoyancy”. why the
cargo is kept at the bottom of the ship? (7)
b) Explain the following
i)streamline flow ii)Turbulent flow (7)
4. a) Explain the following with reference to Bernoulli’s theorem:
i)Venturimeter ii)Bunsen burner (7)
b) A steel wire 4m in length and 2.4 × 10-7 m2 in cross sectional area is stretched by a
force of 36 N. calculate stress, strain ,increase in length. (7)
5. a) What do you understand by capillarity? Describe an experiment to find the surface
tension of water by capillary rise method. (7)
b) For cylindrical pipes, Reynolds number is nearly 2000.if the diameter of a pipe is
2 cm and water flows through it, determine the velocity of the flow.
take h for water = 10-3 Nsm-2 (7)
6. a) Derive the expression for the excess pressure inside a soap bubble of radius R. (7)
b) Explain the principle, construction and working of hydraulic brakes. (7)
7. a) What do you understand by viscosity? Define coefficient of viscosity. (7)
b) Derive the Bernoulli’s equation for the flow of a liquid. (7)
8. a) Explain the different modes of heat transfer. (7)
b) Explain Anamolous expansion of water. (7)
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