SSC JE Mechanical Engineering 25th May 2014 Shift-2
For the following questions answer them individually
Maximum theoretical efficiency of Pelton wheel is obtained when the ratio of bucket speed to jet speed is
The velocity at a point on the crest of a model dam was measured to be 1m/s. The corresponding prototype velocity for a linear scale ratio of 25, in m/s, is
Pressure force on the 15 cm diameter headlight of an automobile travelling at 0.25 m/s is
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
The friction head lost due to flow of a viscous fluid through a circular pipe of length L and diameter d with a velocity v and pipe Fanning friction factor f is
The ratio of pressures between two points A and B located respectively at depths 0.5 m and 2 m below a constant level of water in a tank is
A hydraulic turbine runs at 240 rpm under a head of 9 m. Whatwill be the speed (in rpm) of the turbineif operating head is 16 m?
The discharge of a liquid of kinematic viscosity $$4 \times 10^{-2} m^2/s$$ through a 80 mm diameter pipe is $$3200 \pi \times 10^{-4} m^3/s$$. The flow is
Assertion (A) :
If a hot metal ball is quenched in a liquid of low temperature, heat transfer will take place from metal ball to liquid and not in the reverse direction.
Reason(R) :
Heat transfer process from hot metal ball to liquid ‘at lower temperature complies with the increase of entropy principle i.e. $$S_{gen} \geq 0$$ and the reverse process does not.
The boiling and freezing points for water are marked on a temperature scale P as $$130^\circ P$$ and $$-20^\circ P$$ respectively. What will be the reading on this scale corresponding to $$60^\circ C$$ on Celsius scale ?
