ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019

A uniform wooden cylinder has a specific gravity of 0.5. Find the ratio of diameter to length of the cylinderso that it will just float upright in a state of neutral equilibrium in water

In s siphon, the summit is 3 m above the water level in the reservoir from which the flow is being discharged. If the head loss from the inlet of the siphon to the summit is 1.5 m and the velocity head at the summitis 0.5 m, the absolute pressure at the summit is

Two pipe lines of equal length and diameters of 10cm and 40cm are connected in parallel between two reservoirs. If friction factor f is same for both the pipes, the ratio of the
discharges in the larger to the smaller pipe is

The fluid property responsible for the problem of water hammer is

Within a boundary layer

The values of enthalpy of steamat inlet and outlet of a steam turbine in a Rankinecycle are 2800 kJ/kg and 1800 kJ/kg respectively. Neglecting pump work, the specific steam
consumptionin kg/kW-hour is

A pump handlinga liquid raises its pressure from 1 barto 30 bar. Take the density of liquid as 990 kg/m$$^3$$. The isentropic specific work done by the pumpin kj/kg is

A heat engine using lake water at $$12^\circ C$$ as source and the surrounding atmosphere at $$2^\circ C$$ as sink executes 1080 cycles per min. If the amount of heat drawn per cycle is 57 J, then the output of the engine will be

The unit of Stefan Boltzmann constant is

In a furnace, the wall thickness is 60 cm and is 100 cm wide by 150 cm height made of material with thermal conductivity 0.4 W/mK. The temperature inside and outside are $$1000^\circ C$$ and $$4^\circ C$$ respectively. The thermal resistance is