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Engineering :: Heat Engines


361.  In a impulse turbine while steam flows through the moving blades
A. Velocity reduces B. Velocity increases
C. Pressure reduces D. Velocity reduces while pressure increases
E. Both velocity as well as pressure increase    

362.  The processes in a Rankine cycle are
A. Two isothermal and two isentropic B. Two isothermal and two polytropic
C. Two isothermal and two isobaric D. One constant pressure, one constant volume and two polytropic
E. None of the above    

363.  In a throttle governed steam engine
A. Admission pressure is reduced while cut off remains unaltered B. Admission pressure is varied while cut off remains unaltered
C. Admission pressure remains constant while cut off is altered D. Admission pressure and cut off both are altered
E. Neither admission pressure nor cut off is altered    

364.  In a cut off covered steam engine
A. Admission pressure is increased while cut off remains unaltered B. Admission pressure is reduced while cut off remains unaltered
C. Admission pressore remains constant while cut off is varied D. Admission pressure and cut off both are varied
E. Neither admission pressure nor cut off is varied    

365.  In a reaction turbine while steam flows through the fixed blades
A. Velocity increases B. Pressure increases
C. Velocity decreases D. Velocity increases while pressure drops

366.  In case of pressure compounded impulse turbine, for the steam while flowing through the nozzle of second stage
A. Pressure increases B. Pressure and velocity both increase
C. Pressure and velocity both decrease D. Pressure increases while velocity decreases
E. Pressure drops while velocity increases    

367.  Reheating of steam for steam turbine cycle is done primarily to
A. Reduce dryness fraction of exhaust steam B. Increase the pressure of steam in the condenser
C. Increase boiler chimney draught D. Improve thermal efficiency of the plant
E. All of the above    

368.  The term regeneration is closely associated with
A. Steam engines B. Steam turbines
C. Diesel engines D. Gas engines
E. Wankel engines    

369.  During regenerative feed heating
A. Part of the steam is generated in turbine B. Condenser is supplied with dry and staturated steam
C. Part of the steam is bled from turbine for feed water heating D. High pressure steam is used to heat low pressure steam coming out of the turbine after expansion
E. None of the above    

370.  In regenerative feed heating system the steam 'bled' from turbine exchanges heat with
A. High pressure steam coming from boiler B. Air for preheating
C. Fuel for preheating D. Feed water for boiler
E. All of the above    




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