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You Are On Multi Choice Question Bank SET 1480

74001. The variation of steam pressure in the nozzle depends upon





74002. Steam turbines are used for





74003. Parson's turbine is a





74004. The value of the reheat factor varies from





74005. The steam enters the nozzle at a





74006. The difference of supersaturated temperature and saturation temperature at that pressure is called





74007. Ramsar convention is related to the protection of?





74008. The ratio of the useful heat drop to the isentropic heat drop is called





74009. The efficiency of steam turbines may be improved by





74010. In a reaction turbine, when steam flows through the fixed blades,





74011. A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be





74012. In a De-Laval impulse turbine, the nozzle is kept very close to the blades.



74013. The flow of steam is super-sonic





74014. The pressure of steam at throat of a steam nozzle is called critical pressure.



74015. For maximum efficiency of an impulse turbine, the steam should leave the blades at right angles to their motion.



74016. Which queen enjoyed political power along with her husband?





74017. The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 α, where α is the nozzle exit flow angle, if the





74018. When the cross-section of a nozzle increases continuously from entrance to exit, it is called a





74019. Rateau turbine is





74020. The ratio of the work delivered at the turbine shaft to the heat supplied is called overall thermal efficiency of turbine.



74021. In a single stage impulse turbine, the velocity of steam approaching nozzles is negligible.



74022. Curtis turbine is a





74023. The velocity of steam at throat of the nozzle is __________ the velocity of sound.




74024. The critical pressure ratio for initially dry saturated steam is





74025. The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.



74026. The velocity of steam, in reaction turbines, is increased in the fixed blades as well as in moving blades.



74027. The critical pressure ratio for gases is





74028. The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.




74029. The effect of supersaturation is that the





74030. The effect of friction on the flow of steam through a nozzle is to





74031. The ratio of the isentropic heat drop to the heat supplied, is called





74032. When the cross-section of a nozzle first increases from its entrance to throat, and then decreases from its throat to exit, it is not a convergent-divergent nozzle.



74033. The efficiency ratio is the ratio of total useful heat drop to the total isentropic heat drop.



74034. The purpose of governing in steam turbines is to





74035. De-Laval turbines are mostly used





74036. The reheat factor depends upon





74037. In an impulse turbine





74038. A nozzle is said to be a divergent nozzle





74039. The ratio of the cumulative heat drop to the isentropic heat drop is called reheat factor.



74040. The compounding of turbines is done in order to





74041. The pressure of steam __________ while flowing through a nozzle.




74042. The process of maintaining the speed of the turbine constant for various load conditions, is known as





74043. Reheating of steam in a turbine





74044. Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?





74045. The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.





74046. The ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called





74047. The diagram efficiency is the ratio of





74048. The Rankine efficiency depends upon total useful heat drop and total isentropic heat drop.



74049. Blading efficiency is also known as





74050. The pressure of steam, in reaction turbines, is reduced in the fixed blades as well as in moving blades.



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