Steam Boilers, Engines, Nozzles and Turbines The feed check valve is used in order to Allow high pressure feed water to flow to drum and not allow reverse flow to take place Recirculate unwanted feed water Check level of water in boiler drum Regulate flow of boiler water Allow high pressure feed water to flow to drum and not allow reverse flow to take place Recirculate unwanted feed water Check level of water in boiler drum Regulate flow of boiler water ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The Parsons' reaction turbine has Identical fixed and moving blades Only moving blades Only fixed blades Fixed and moving blades of different shape Identical fixed and moving blades Only moving blades Only fixed blades Fixed and moving blades of different shape ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet) Vb = 0.5 V² cosα Vb = 0.5 V cosα Vb = V cos α Vb = V² cos α Vb = 0.5 V² cosα Vb = 0.5 V cosα Vb = V cos α Vb = V² cos α ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The function of a piston in a steam engine is To guide motion of the piston rod and to prevent it from bending To transfer motion from the piston to the cross-head None of these To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment To guide motion of the piston rod and to prevent it from bending To transfer motion from the piston to the cross-head None of these To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called Balanced draught Induced draught Forced draught Natural draught Balanced draught Induced draught Forced draught Natural draught ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be 640 m/s 640/3 m/s 160/3 m/s 320/3 m/s 640 m/s 640/3 m/s 160/3 m/s 320/3 m/s ANSWER DOWNLOAD EXAMIANS APP
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